is an international journal intended for professionals and researchers in all fields of Pahrmaceutical Science. IJPSI publishes research articles and reviews within the whole field Pharmacy and Pharmaceutical Science, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online
Antibiogram of Staphylococcus Aureus and its Sensitivity to Ocimum Gratissimu...ijtsrd
In this study, clinical isolate of Staphylococcus aureus was subjected to susceptibility tests against commercially available antibiotics and Ocimum gratissimum scent leaf leaf extracts. disc diffusion nmethod was adopted for the antibiotics test while agar well diffusion technique was employed for the antimicrobial screening of the leaf extracts. The result shows that the organism was sensitive to Gentamycin, Zinnacef, Ciprofloxacin and Streptomycin representing 40 of the antibiotics while showing outright resistance to Ampiclox, Amoxicillin and Erythromycin 30 and intermediate results for the rest. Also, the cold water extract of O. gratissimum did not show any activity against the bacterium. However, both hot water extract and ethanol extract of the plant had varying degree of activity against the organism with ethanol extract recording a zone of inhibition of 25.33 mm compared with 32.00 mm recorded for Gentamycin. Furthermore, the minimum inhibitory concentration recorded ofr the extract against the organism were 10 mg ml and 2.5 mg ml respectively for hot water and ethanol extracts. These results indicate that ethanol extract of O. gratissimum leaf is very effective against Staphylococcus aureus and could be used as potential source of natural product for the treatment of infections caused by the organism especially the antibiotic resistant strains. Komolafe T. O. | Ogunyankin O. G "Antibiogram of Staphylococcus Aureus and its Sensitivity to Ocimum Gratissimum Extract" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd46333.pdf Paper URL : https://www.ijtsrd.com/other-scientific-research-area/other/46333/antibiogram-of-staphylococcus-aureus-and-its-sensitivity-to-ocimum-gratissimum-extract/komolafe-t-o
INVESTIGATION OF IN-VITRO ANTHELMINTIC AND CYTOTOXIC ACTIVITIES OF ARTABOTRYS...Syed Masudur Rahman Dewan
The methanolic extract of bark of Artabotrys hexapetalus were investigated for in-vitro anthelmintic and cytotoxic activities. Evaluation of cytotoxic activity was done using the brine shrimp lethality bio-assay. The crude methanolic extract showed significant cytotoxic potential (LC50 value of 7.688 μg/ml) comparing with that of standard vincristine (0.839 μg/ml). The other study was undertaken to evaluate anthelmintic activity where albendazole was used as reference standard. Methanolic extract of barks (50 mg/ml) caused paralysis of the worms at 68.33 minutes and death at 84.0 minutes while albendazole (positive control) paralyzed and killed the worms at 17 minutes and 48 minutes respectively at the concentration of 10 mg/ml. The study confirms the significant anthelmintic activities of bark extract of Artabotrys hexapetalus and therefore demands the isolation of active principles through bioassay.
Antibacterial Activity of Leaf Methanolic Extract of S. Caryophyllatum (L.) A...iosrjce
S.caryophyllatum (L.) Alston belongs to the family Myrtaceae is an endangered species. It possesses
traditional as well as pharmacological properties. The objective of the present investigation was to find out the
antibacterial activity of S. caryophyllatum leaf methanolic extract against some human pathogenic bacteria. It
was followed by Disc Diffusion method using gram positive and gram negative bacterial strains such as
Staphylococcus aureus, Bacillus cereus, Bacillus subtilis, Bacillus megaterium, Sarcina lutea, Esherichia coli,
Pseudomonas aeruginosa, Klebsiella Spp., Salmonella typhi and Proteus mirabilis. The result showed that the
inhibitory effect on Bacillus subtilis (24mm) was high when compared to E. coli (21mm) and Bacillus cereus
(20mm).This effect on the bacterial strains may be due to the presence of secondary metabolites present in the
leaf methanolic extract of Syzygium caryophyllatum.
Antibiogram of Staphylococcus Aureus and its Sensitivity to Ocimum Gratissimu...ijtsrd
In this study, clinical isolate of Staphylococcus aureus was subjected to susceptibility tests against commercially available antibiotics and Ocimum gratissimum scent leaf leaf extracts. disc diffusion nmethod was adopted for the antibiotics test while agar well diffusion technique was employed for the antimicrobial screening of the leaf extracts. The result shows that the organism was sensitive to Gentamycin, Zinnacef, Ciprofloxacin and Streptomycin representing 40 of the antibiotics while showing outright resistance to Ampiclox, Amoxicillin and Erythromycin 30 and intermediate results for the rest. Also, the cold water extract of O. gratissimum did not show any activity against the bacterium. However, both hot water extract and ethanol extract of the plant had varying degree of activity against the organism with ethanol extract recording a zone of inhibition of 25.33 mm compared with 32.00 mm recorded for Gentamycin. Furthermore, the minimum inhibitory concentration recorded ofr the extract against the organism were 10 mg ml and 2.5 mg ml respectively for hot water and ethanol extracts. These results indicate that ethanol extract of O. gratissimum leaf is very effective against Staphylococcus aureus and could be used as potential source of natural product for the treatment of infections caused by the organism especially the antibiotic resistant strains. Komolafe T. O. | Ogunyankin O. G "Antibiogram of Staphylococcus Aureus and its Sensitivity to Ocimum Gratissimum Extract" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd46333.pdf Paper URL : https://www.ijtsrd.com/other-scientific-research-area/other/46333/antibiogram-of-staphylococcus-aureus-and-its-sensitivity-to-ocimum-gratissimum-extract/komolafe-t-o
INVESTIGATION OF IN-VITRO ANTHELMINTIC AND CYTOTOXIC ACTIVITIES OF ARTABOTRYS...Syed Masudur Rahman Dewan
The methanolic extract of bark of Artabotrys hexapetalus were investigated for in-vitro anthelmintic and cytotoxic activities. Evaluation of cytotoxic activity was done using the brine shrimp lethality bio-assay. The crude methanolic extract showed significant cytotoxic potential (LC50 value of 7.688 μg/ml) comparing with that of standard vincristine (0.839 μg/ml). The other study was undertaken to evaluate anthelmintic activity where albendazole was used as reference standard. Methanolic extract of barks (50 mg/ml) caused paralysis of the worms at 68.33 minutes and death at 84.0 minutes while albendazole (positive control) paralyzed and killed the worms at 17 minutes and 48 minutes respectively at the concentration of 10 mg/ml. The study confirms the significant anthelmintic activities of bark extract of Artabotrys hexapetalus and therefore demands the isolation of active principles through bioassay.
Antibacterial Activity of Leaf Methanolic Extract of S. Caryophyllatum (L.) A...iosrjce
S.caryophyllatum (L.) Alston belongs to the family Myrtaceae is an endangered species. It possesses
traditional as well as pharmacological properties. The objective of the present investigation was to find out the
antibacterial activity of S. caryophyllatum leaf methanolic extract against some human pathogenic bacteria. It
was followed by Disc Diffusion method using gram positive and gram negative bacterial strains such as
Staphylococcus aureus, Bacillus cereus, Bacillus subtilis, Bacillus megaterium, Sarcina lutea, Esherichia coli,
Pseudomonas aeruginosa, Klebsiella Spp., Salmonella typhi and Proteus mirabilis. The result showed that the
inhibitory effect on Bacillus subtilis (24mm) was high when compared to E. coli (21mm) and Bacillus cereus
(20mm).This effect on the bacterial strains may be due to the presence of secondary metabolites present in the
leaf methanolic extract of Syzygium caryophyllatum.
Biological Efficacy of Quassia Indica (Geratn) Nooteb and Centella Asiatica (...IOSRJPBS
Antimicrobial activity of different extracts of two selected plants, Quassia indica (Geartn) Nooteb and Centella asiatica (L.) Urban were tested against selected strains of bacteria viz; Escherichia coli, Staphylococcus aureus, Pseudomonas sps, Bacillus thuringiensis, Klebsiella sps and Serratia sps using agar disc diffusion technique. Petroleum ether, acetone, methanol and water extracts of seed and leaf of Q. indica and leaf of C. asiatica showed moderate to significant antimicrobial activity. Of the four extracts tested, petroleum ether and water fractions showed more activity against all the bacterial strains. The zone of inhibition of the active fractions for the petroleum ether ranged from 8.57 to 12.63 mm and 8.53 to 14.5mm for the water fraction of Q. indica seed and leaf and C. asiatica leaf; and exhibited comparable results with widely used commercial antimicrobial agents (16 to19 mm for Kanamycin and 14 to 17mm for Cefotaxime). The results prove the efficacy of the most active fractions of the selected plant extracts to be used for developing potent antimicrobial formulations.
In vitro assessment of antibacterial activity of Salicornia herbacea L. seed ...Innspub Net
In this study, the antibacterial activities of Salicornia herbacea L. seed extract against two gram-negative and two gram- positive bacteria were evaluated with the agar disc diffusion and MIC methods. Result showed that inhibition zones of 9.5±0.01, 6.2±0.00, 4±0.00 and 3.5±0.10 mm for Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa and Escherichia coli, respectively. Among four bacteria the maximum and minimum inhibition seed ethanolic extract were related to S. aureus with inhibition zones of 9.5mm and MIC 189.5 mg/ml and E. coli with inhibition zones of 3.5 mm and MIC 420 mg/ml, respectively. The antimicrobial activity of ethanol seed extract of S. herbacea is the result of phenolic compounds, fatty acids, osmotic compound (betaine)
or synergic and additive effect of several compounds present in it. Our results suggest the possibility of using S. herbacea seed, which possesses strong antibacterial activity, in the treatment of diseases caused by the microorganisms tested. Get the full articles at: http://www.innspub.net/volume-4-number-6-march-2014/
Phytochemical screening and antimicrobial studies of uapaca togoensis (pax) s...theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Protein was extracted from muscles of Channa striatus and attempts were
made to evaluate in vitro antibacterial activity against clinical bacterial isolates. The
higher concentration of protein (100μg/ml) extracts exhibited a pronounced activity
against Pseudomonas aeruginosa (21 mm), Proteus vulgaris (19 mm), Citrobacter sp
(19 mm), Klebsiella pneumoniae (18 mm), Micrococcus sp (17 mm), Bacillus subtilis (16
mm), Staphylococcus aureus (15 mm), E. coli (14 mm) and Serratia marcescens (5
mm). The minimum inhibitory concentration and minimum bactericidal concentration
were found to be 20-40 μg/ml and 80-100 μg/ml respectively for the extracts of
Channa striatus protein against test organisms. This study confirms that C. striatus fish
protein extracts possess antibacterial activity against a wide range of microbes and
justified that it could be used in the traditional medicine as a remedy for the
treatment of bacterial diseases.
This poster was presented at the 2015 Georgia Bio Conference in Atlanta, GA.
Abstract:
Alarming trends in the spread of antibiotic resistance among top pathogens, including Staphylococcus aureus, have pushed mankind toward what has been coined as the “post-antibiotic era.” Therefore, an indirect attack on bacteria through interfering with their means of communication, quorum sensing, is proposed. An underappreciated source for modern anti-infectives is natural products from terrestrial plants. A rich history of medical traditions developed under the influence of diverse cultures in the Mediterranean and many of these are still practiced by local people. Investigation of botanical folk medicines used in the treatment of skin and soft tissue infections identified Castanea sativa (European Chestnut) for its potential antibacterial activity.
This work demonstrates the quorum sensing inhibitory activity of oleanene and ursene derivatives from a C. sativa leaf extract against all S. aureus accessory gene regulator (agr) alleles. Multiple layers of evidence for agr blocking activity (IC50 1.56-25 µg mL-1) are reported: toxin outputs, reporter assays, hemolytic activity, cytotoxicity studies, and an in vivo abscess model. The C. sativa extract is neither cytotoxic to human keratinocytes, nor murine skin; it neither inhibits S. aureus growth, nor skin commensal growth. Serial passaging experiments with the extract did not result in the development of resistance. In conclusion, the disruption of quorum sensing in the absence of growth inhibition demonstrated by this natural product derived non-biocidal inhibitor of virulence shows potential for future antibiotic therapies.
An Investigation Into The Mechanisms Underlying Enhanced Biosulphidogenesis I...iosrjce
Anthropogenic activities like mining, processes of metallurgy and other chemical industries lead to
the discharge of a high amount of sulphate into the environment that causes serious problems to human health.
This paper illustrates the employment of thermophilic sulphate reducing bacteria for biosulphidogenesis. Two
different species have been isolated from hot water spring of Vajreshwari and Ganeshpuri,Thane, Maharashtra,
INDIA.The mechanism involved in biosulphidogenesis includes production of specific protein as well as
liberation of some extracellular polymeric compound (EPS) e.g. proteins, carbohydrate, acids etc. that are
produced during the microbial cell metabolism. These compounds plays an important role in the faster
reduction of sulphate and decrease in production rate of sulphide.The isolate was found to be of genus
Bacillusand type strain was found to be subtilis Zankar and licheniformis Sonali. The strain sequence were
deposited in NCBI database with accession number KJ939324 and KJ939325 respectively. The result highlights
the potential use of these organism in biosulphidogenesis.
SYNERGISTIC ANTIMICROBIAL ACTIVITIES OF PHYTOESTROGENS IN CRUDE EXTRACTS OF T...lukeman Joseph Ade shittu
Intensive studies on extracts and biologically active compounds isolated from medicinal plants have doubled in the last decade worldwide. However, as a result of paucity of knowledge and folkloric claim on the effectiveness of sesame leaves in infectious disease treatments, we aimed to determine the synergistic antimicrobial activity of essential oils and lignans present in the crude leaves extracts of Sesame radiatum and Sesame indicum. Ethanolic, methanolic and aqueous extracts of both leaves were studied for their in-vitro synergistic antimicrobial activity against both Gram positive and Gram negative micro-organisms, and Yeast using Agar diffusion method. The GC-MS phytochemical screening of methanolic extract showed that the major compounds in essential oils are of carboxylic acids and phenolic groups especially, the most potent antioxidants known to man like sesamol, sesamolin and sesamin among others. Methanolic and ethanolic extracts have broad spectrum antimicrobial effect against all the tested pathogenic micro-organisms except Streptococcus pneumoniae and Staphylococcus aureus respectively, while the aqueous extract exhibited inhibitory activity on Staphylococcus aureus, Streptococcus pneumoniae and Candida albicans. The result confirmed the folkloric claims of the antimicrobial effectiveness of locally consumed sesame leaves extracts especially against bacterial and common skin infection in many areas of Nigeria .
Identification and Evaluation of Antifungal Compounds from Botanicals for th...researchagriculture
Red rot is a devastating disease in sugarcane caused by fungus,
Colletotrichum
falcatum
. In this study, eighteen different botanicals were screened for
identifying effective antifungal compound against
C.
falcatum.
Among the plants
screened, 15 per cent aqueous leaf extract of
Psoralea corylifolia
alone inhibited 100
per cent growth of both mycelium as well as spore germination under
in vitro
conditions. The extract did not exhibit any inhibitory effect to the beneficial microbes
viz.
,
Pseudomonas fluorescens
,
Bacillus megaterium
and
Gluconacetobacter
diazotrophicus
which are normally used in sugarcane. The effective plant extracts
exhibiting 100 per cent antifungal activity was subjected to TLC, HPLC and GC
-
MS
analysis to identify the bioactive antifungal compound. It revealed the
presence of
7H
-
furo [3,2
-
G] (1) benzopyran
-
7
-
one as main bioactive compound which is thought to be
the intermediate of antifungal compound, 8
–
methoxypsoralen formed during
biosynthesis.
In vitro controlling of selected human diarrhea causing bacteria by clove ext...Open Access Research Paper
Antibacterial activity of clove extracts (Syzygium aromaticum L.) was proven against five diarrhea causing bacteria. This was further confirmed when compared with commonly used three commercial antibiotics (ciprofloxacin, tetracycline and erythromycin) as a positive control. Significant differences (P<0.0001) were observed in the effect of the antimicrobial agents (clove extracts and antibiotics), and in the sensitivities of the bacterial species (P<0.0001) to the antimicrobial agents. Clove extracts had significant (P<0.001) activity with the acetone extract demonstrating highest activity followed by antibiotics and other extracts against tested bacteria. The zone of inhibition of clove extracts was ranged from 7.33 to 12.00 mm whereas in antibiotics, it was 0.00 to 11.67 mm. Of all the bacteria, Salmonella typhimurium was the most susceptible against all of the extracts as well as concentrations of clove, while low MIC (180 mgml-1) and MBC (680 mgml-1) of the extracts were observed against Shigella dysenteriae. Consequently, clove has a significant antidiarrheal activity and it could be used as an effective antibacterial agent, alternative to the use of antibiotics.
Pharmacological activity of the methanolic extract of sea urchins against esc...Innspub Net
This study elucidated the pharmacological potential of sea urchins using methanol as extracting medium. The antibacterial potential was evaluated using the paper disc method and zone of inhibition against Escherichia coli and Staphylococcus aureus was measured. Antioxidant properties of sea urchins were evaluated using DPPH radical scavenging assay. Three species of sea urchin randomly collected along the intertidal zone of Diguisit, Baler Aurora were identified using diagnostic keys by the National Museum of the Philippines and they were identified as follows; Echinothrix diadema, Echinometra mathaei, and Echinometra oblonga. E. diadema recorded the highest diameter zone of inhibition against E. coli and S. aureus after 24 hours of incubation with 11.03 ± 1.75mm and 13.52 ± 1.13mm respectively while E. mathaei only inhibited S. aureus with zone of inhibition of 9.27 ± 2.06mm in 24 hours of incubation as well. As the zone of inhibition prolongs, the zone of inhibition decreases as observed in 48 hours of incubation. E. oblonga did not show inhibitoy effect, however it recorded the highest radical scavenging activity with 64.46% among the three species of sea urchins. This was followed by E. mathaei (51.52%) and E. diadema (37.38%). All collected species manifested antioxidant potential. Based on the results, the collected species of sea urchins has a pharmacological potential.
ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF ALGERIAN POPULUS NIGRA L. BUDS EX...bioejjournal
In organic extracts, tanins, flavonoïds, coumarins, alkaloids and terpenoïds were the principals secondary
metabolites identified from the flower buds of black poplar. Antibacterial and antifungal activities of
extracts were tested using agar-well diffusion method and micro-well determination of MIC assay against
eleven bacteria and two Candida species. It was found that extracts of black poplar buds exhibit
antibacterial and anticandidal activities with agar disk diffusion (7 to 43mm) and MIC methods (MIC=
90.33 µg/ml against several strains of bacteria and MIC=45.16 µg/ml against Candida albicans). The
antioxidant effect of hydroalcoholic extract was evaluated using DPPH and FRAP assays. It was showed
good and similar activity than ascorbic acid and BHA by DPPH method: IC50= 220µg/mL for
hydroethanol extract.
Biological Efficacy of Quassia Indica (Geratn) Nooteb and Centella Asiatica (...IOSRJPBS
Antimicrobial activity of different extracts of two selected plants, Quassia indica (Geartn) Nooteb and Centella asiatica (L.) Urban were tested against selected strains of bacteria viz; Escherichia coli, Staphylococcus aureus, Pseudomonas sps, Bacillus thuringiensis, Klebsiella sps and Serratia sps using agar disc diffusion technique. Petroleum ether, acetone, methanol and water extracts of seed and leaf of Q. indica and leaf of C. asiatica showed moderate to significant antimicrobial activity. Of the four extracts tested, petroleum ether and water fractions showed more activity against all the bacterial strains. The zone of inhibition of the active fractions for the petroleum ether ranged from 8.57 to 12.63 mm and 8.53 to 14.5mm for the water fraction of Q. indica seed and leaf and C. asiatica leaf; and exhibited comparable results with widely used commercial antimicrobial agents (16 to19 mm for Kanamycin and 14 to 17mm for Cefotaxime). The results prove the efficacy of the most active fractions of the selected plant extracts to be used for developing potent antimicrobial formulations.
In vitro assessment of antibacterial activity of Salicornia herbacea L. seed ...Innspub Net
In this study, the antibacterial activities of Salicornia herbacea L. seed extract against two gram-negative and two gram- positive bacteria were evaluated with the agar disc diffusion and MIC methods. Result showed that inhibition zones of 9.5±0.01, 6.2±0.00, 4±0.00 and 3.5±0.10 mm for Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa and Escherichia coli, respectively. Among four bacteria the maximum and minimum inhibition seed ethanolic extract were related to S. aureus with inhibition zones of 9.5mm and MIC 189.5 mg/ml and E. coli with inhibition zones of 3.5 mm and MIC 420 mg/ml, respectively. The antimicrobial activity of ethanol seed extract of S. herbacea is the result of phenolic compounds, fatty acids, osmotic compound (betaine)
or synergic and additive effect of several compounds present in it. Our results suggest the possibility of using S. herbacea seed, which possesses strong antibacterial activity, in the treatment of diseases caused by the microorganisms tested. Get the full articles at: http://www.innspub.net/volume-4-number-6-march-2014/
Phytochemical screening and antimicrobial studies of uapaca togoensis (pax) s...theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Protein was extracted from muscles of Channa striatus and attempts were
made to evaluate in vitro antibacterial activity against clinical bacterial isolates. The
higher concentration of protein (100μg/ml) extracts exhibited a pronounced activity
against Pseudomonas aeruginosa (21 mm), Proteus vulgaris (19 mm), Citrobacter sp
(19 mm), Klebsiella pneumoniae (18 mm), Micrococcus sp (17 mm), Bacillus subtilis (16
mm), Staphylococcus aureus (15 mm), E. coli (14 mm) and Serratia marcescens (5
mm). The minimum inhibitory concentration and minimum bactericidal concentration
were found to be 20-40 μg/ml and 80-100 μg/ml respectively for the extracts of
Channa striatus protein against test organisms. This study confirms that C. striatus fish
protein extracts possess antibacterial activity against a wide range of microbes and
justified that it could be used in the traditional medicine as a remedy for the
treatment of bacterial diseases.
This poster was presented at the 2015 Georgia Bio Conference in Atlanta, GA.
Abstract:
Alarming trends in the spread of antibiotic resistance among top pathogens, including Staphylococcus aureus, have pushed mankind toward what has been coined as the “post-antibiotic era.” Therefore, an indirect attack on bacteria through interfering with their means of communication, quorum sensing, is proposed. An underappreciated source for modern anti-infectives is natural products from terrestrial plants. A rich history of medical traditions developed under the influence of diverse cultures in the Mediterranean and many of these are still practiced by local people. Investigation of botanical folk medicines used in the treatment of skin and soft tissue infections identified Castanea sativa (European Chestnut) for its potential antibacterial activity.
This work demonstrates the quorum sensing inhibitory activity of oleanene and ursene derivatives from a C. sativa leaf extract against all S. aureus accessory gene regulator (agr) alleles. Multiple layers of evidence for agr blocking activity (IC50 1.56-25 µg mL-1) are reported: toxin outputs, reporter assays, hemolytic activity, cytotoxicity studies, and an in vivo abscess model. The C. sativa extract is neither cytotoxic to human keratinocytes, nor murine skin; it neither inhibits S. aureus growth, nor skin commensal growth. Serial passaging experiments with the extract did not result in the development of resistance. In conclusion, the disruption of quorum sensing in the absence of growth inhibition demonstrated by this natural product derived non-biocidal inhibitor of virulence shows potential for future antibiotic therapies.
An Investigation Into The Mechanisms Underlying Enhanced Biosulphidogenesis I...iosrjce
Anthropogenic activities like mining, processes of metallurgy and other chemical industries lead to
the discharge of a high amount of sulphate into the environment that causes serious problems to human health.
This paper illustrates the employment of thermophilic sulphate reducing bacteria for biosulphidogenesis. Two
different species have been isolated from hot water spring of Vajreshwari and Ganeshpuri,Thane, Maharashtra,
INDIA.The mechanism involved in biosulphidogenesis includes production of specific protein as well as
liberation of some extracellular polymeric compound (EPS) e.g. proteins, carbohydrate, acids etc. that are
produced during the microbial cell metabolism. These compounds plays an important role in the faster
reduction of sulphate and decrease in production rate of sulphide.The isolate was found to be of genus
Bacillusand type strain was found to be subtilis Zankar and licheniformis Sonali. The strain sequence were
deposited in NCBI database with accession number KJ939324 and KJ939325 respectively. The result highlights
the potential use of these organism in biosulphidogenesis.
SYNERGISTIC ANTIMICROBIAL ACTIVITIES OF PHYTOESTROGENS IN CRUDE EXTRACTS OF T...lukeman Joseph Ade shittu
Intensive studies on extracts and biologically active compounds isolated from medicinal plants have doubled in the last decade worldwide. However, as a result of paucity of knowledge and folkloric claim on the effectiveness of sesame leaves in infectious disease treatments, we aimed to determine the synergistic antimicrobial activity of essential oils and lignans present in the crude leaves extracts of Sesame radiatum and Sesame indicum. Ethanolic, methanolic and aqueous extracts of both leaves were studied for their in-vitro synergistic antimicrobial activity against both Gram positive and Gram negative micro-organisms, and Yeast using Agar diffusion method. The GC-MS phytochemical screening of methanolic extract showed that the major compounds in essential oils are of carboxylic acids and phenolic groups especially, the most potent antioxidants known to man like sesamol, sesamolin and sesamin among others. Methanolic and ethanolic extracts have broad spectrum antimicrobial effect against all the tested pathogenic micro-organisms except Streptococcus pneumoniae and Staphylococcus aureus respectively, while the aqueous extract exhibited inhibitory activity on Staphylococcus aureus, Streptococcus pneumoniae and Candida albicans. The result confirmed the folkloric claims of the antimicrobial effectiveness of locally consumed sesame leaves extracts especially against bacterial and common skin infection in many areas of Nigeria .
Identification and Evaluation of Antifungal Compounds from Botanicals for th...researchagriculture
Red rot is a devastating disease in sugarcane caused by fungus,
Colletotrichum
falcatum
. In this study, eighteen different botanicals were screened for
identifying effective antifungal compound against
C.
falcatum.
Among the plants
screened, 15 per cent aqueous leaf extract of
Psoralea corylifolia
alone inhibited 100
per cent growth of both mycelium as well as spore germination under
in vitro
conditions. The extract did not exhibit any inhibitory effect to the beneficial microbes
viz.
,
Pseudomonas fluorescens
,
Bacillus megaterium
and
Gluconacetobacter
diazotrophicus
which are normally used in sugarcane. The effective plant extracts
exhibiting 100 per cent antifungal activity was subjected to TLC, HPLC and GC
-
MS
analysis to identify the bioactive antifungal compound. It revealed the
presence of
7H
-
furo [3,2
-
G] (1) benzopyran
-
7
-
one as main bioactive compound which is thought to be
the intermediate of antifungal compound, 8
–
methoxypsoralen formed during
biosynthesis.
In vitro controlling of selected human diarrhea causing bacteria by clove ext...Open Access Research Paper
Antibacterial activity of clove extracts (Syzygium aromaticum L.) was proven against five diarrhea causing bacteria. This was further confirmed when compared with commonly used three commercial antibiotics (ciprofloxacin, tetracycline and erythromycin) as a positive control. Significant differences (P<0.0001) were observed in the effect of the antimicrobial agents (clove extracts and antibiotics), and in the sensitivities of the bacterial species (P<0.0001) to the antimicrobial agents. Clove extracts had significant (P<0.001) activity with the acetone extract demonstrating highest activity followed by antibiotics and other extracts against tested bacteria. The zone of inhibition of clove extracts was ranged from 7.33 to 12.00 mm whereas in antibiotics, it was 0.00 to 11.67 mm. Of all the bacteria, Salmonella typhimurium was the most susceptible against all of the extracts as well as concentrations of clove, while low MIC (180 mgml-1) and MBC (680 mgml-1) of the extracts were observed against Shigella dysenteriae. Consequently, clove has a significant antidiarrheal activity and it could be used as an effective antibacterial agent, alternative to the use of antibiotics.
Pharmacological activity of the methanolic extract of sea urchins against esc...Innspub Net
This study elucidated the pharmacological potential of sea urchins using methanol as extracting medium. The antibacterial potential was evaluated using the paper disc method and zone of inhibition against Escherichia coli and Staphylococcus aureus was measured. Antioxidant properties of sea urchins were evaluated using DPPH radical scavenging assay. Three species of sea urchin randomly collected along the intertidal zone of Diguisit, Baler Aurora were identified using diagnostic keys by the National Museum of the Philippines and they were identified as follows; Echinothrix diadema, Echinometra mathaei, and Echinometra oblonga. E. diadema recorded the highest diameter zone of inhibition against E. coli and S. aureus after 24 hours of incubation with 11.03 ± 1.75mm and 13.52 ± 1.13mm respectively while E. mathaei only inhibited S. aureus with zone of inhibition of 9.27 ± 2.06mm in 24 hours of incubation as well. As the zone of inhibition prolongs, the zone of inhibition decreases as observed in 48 hours of incubation. E. oblonga did not show inhibitoy effect, however it recorded the highest radical scavenging activity with 64.46% among the three species of sea urchins. This was followed by E. mathaei (51.52%) and E. diadema (37.38%). All collected species manifested antioxidant potential. Based on the results, the collected species of sea urchins has a pharmacological potential.
ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF ALGERIAN POPULUS NIGRA L. BUDS EX...bioejjournal
In organic extracts, tanins, flavonoïds, coumarins, alkaloids and terpenoïds were the principals secondary
metabolites identified from the flower buds of black poplar. Antibacterial and antifungal activities of
extracts were tested using agar-well diffusion method and micro-well determination of MIC assay against
eleven bacteria and two Candida species. It was found that extracts of black poplar buds exhibit
antibacterial and anticandidal activities with agar disk diffusion (7 to 43mm) and MIC methods (MIC=
90.33 µg/ml against several strains of bacteria and MIC=45.16 µg/ml against Candida albicans). The
antioxidant effect of hydroalcoholic extract was evaluated using DPPH and FRAP assays. It was showed
good and similar activity than ascorbic acid and BHA by DPPH method: IC50= 220µg/mL for
hydroethanol extract.
ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF ALGERIAN POPULUS NIGRA L. BUDS EX...bioejjournal
This study is part of a goal to investigate chemical composition, antibacterial, antifungal and antioxidant
activities of the flower buds extracts from the Algerian Polulus nigra L., which were collected from Djarifet
- mansourah at Tlemcen city in the West Northern of Algeria.
In organic extracts, tanins, flavonoïds, coumarins, alkaloids and terpenoïds were the principals secondary
metabolites identified from the flower buds of black poplar. Antibacterial and antifungal activities of
extracts were tested using agar-well diffusion method and micro-well determination of MIC assay against
eleven bacteria and two Candida species. It was found that extracts of black poplar buds exhibit
antibacterial and anticandidal activities with agar disk diffusion (7 to 43mm) and MIC methods (MIC=
90.33 µg/ml against several strains of bacteria and MIC=45.16 µg/ml against Candida albicans). The
antioxidant effect of hydroalcoholic extract was evaluated using DPPH and FRAP assays. It was showed
good and similar activity than ascorbic acid and BHA by DPPH method: IC50= 220µg/mL for
hydroethanol extract.
ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF ALGERIAN POPULUS NIGRA L. BUDS EX...bioejjournal
This study is part of a goal to investigate chemical composition, antibacterial, antifungal and antioxidant
activities of the flower buds extracts from the Algerian Polulus nigra L., which were collected from Djarifet
- mansourah at Tlemcen city in the West Northern of Algeria.
In organic extracts, tanins, flavonoïds, coumarins, alkaloids and terpenoïds were the principals secondary
metabolites identified from the flower buds of black poplar. Antibacterial and antifungal activities of
extracts were tested using agar-well diffusion method and micro-well determination of MIC assay against
eleven bacteria and two Candida species. It was found that extracts of black poplar buds exhibit
antibacterial and anticandidal activities with agar disk diffusion (7 to 43mm) and MIC methods (MIC=
90.33 µg/ml against several strains of bacteria and MIC=45.16 µg/ml against Candida albicans). The
antioxidant effect of hydroalcoholic extract was evaluated using DPPH and FRAP assays. It was showed
good and similar activity than ascorbic acid and BHA by DPPH method: IC50= 220µg/mL for
hydroethanol extract.
ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF ALGERIAN POPULUS NIGRA L. BUDS EX...bioejjournal
This study is part of a goal to investigate chemical composition, antibacterial, antifungal and antioxidant
activities of the flower buds extracts from the Algerian Polulus nigra L., which were collected from Djarifet
- mansourah at Tlemcen city in the West Northern of Algeria.
In organic extracts, tanins, flavonoïds, coumarins, alkaloids and terpenoïds were the principals secondary
metabolites identified from the flower buds of black poplar. Antibacterial and antifungal activities of
extracts were tested using agar-well diffusion method and micro-well determination of MIC assay against
eleven bacteria and two Candida species. It was found that extracts of black poplar buds exhibit
antibacterial and anticandidal activities with agar disk diffusion (7 to 43mm) and MIC methods (MIC=
90.33 μg/ml against several strains of bacteria and MIC=45.16 μg/ml against Candida albicans). The
antioxidant effect of hydroalcoholic extract was evaluated using DPPH and FRAP assays. It was showed
good and similar activity than ascorbic acid and BHA by DPPH method: IC50= 220μg/mL for
hydroethanol extract.
Antioxidant and Antimicrobial Activities Of Algerian Populus Nigra L. Buds Ex...bioejjournal
This study is part of a goal to investigate chemical composition, antibacterial, antifungal and antioxidant activities of the flower buds extracts from the Algerian Polulus nigra L., which were collected from Djarifet - mansourah at Tlemcen city in the West Northern of Algeria. In organic extracts, tanins, flavonoïds, coumarins, alkaloids and terpenoïds were the principals secondary metabolites identified from the flower buds of black poplar. Antibacterial and antifungal activities of
extracts were tested using agar-well diffusion method and micro-well determination of MIC assay against
eleven bacteria and two Candida species. It was found that extracts of black poplar buds exhibit
antibacterial and anticandidal activities with agar disk diffusion (7 to 43mm) and MIC methods (MIC=
90.33 µg/ml against several strains of bacteria and MIC=45.16 µg/ml against Candida albicans). The
antioxidant effect of hydroalcoholic extract was evaluated using DPPH and FRAP assays. It was showed good and similar activity than ascorbic acid and BHA by DPPH method: IC50= 220µg/mL for hydroethanol extract.
ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF ALGERIAN POPULUS NIGRA L. BUDS EX...bioejjournal
his study is part of a goal to investigate chemical composition, antibacterial, antifungal and antioxidant activities of the flower buds extracts from the Algerian Polulus nigra L., which were collected from Djarifet - mansourah at Tlemcen city in the West Northern of Algeria. In organic extracts, tanins, flavonoïds, coumarins, alkaloids and terpenoïds were the principals secondary metabolites identified from the flower buds of black poplar. Antibacterial and antifungal activities of extracts were tested using agar-well diffusion method and micro-well determination of MIC assay against eleven bacteria and two Candida species. It was found that extracts of black poplar buds exhibit antibacterial and anticandidal activities with agar disk diffusion (7 to 43mm) and MIC methods (MIC= 90.33 µg/ml against several strains of bacteria and MIC=45.16 µg/ml against Candida albicans). The antioxidant effect of hydroalcoholic extract was evaluated using DPPH and FRAP assays. It was showed good and similar activity than ascorbic acid and BHA by DPPH method: IC50= 220µg/mL for hydroethanol extract.
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Choclospermum planchonii leaf were tested against some clinical bacterial isolates and reference organisms.
The phytochemical screenings of the extracts were also carried out. The leaf extracts of the plant exhibited
antibacterial activities against clinical isolates of Escherichia coli, Pseudomonas aeruginosa, Staphylococcus
aureus, Shigella flexneri, and Salmonella typhii and reference strains of Staphylococcus aureus (ATCC 28923),
Escherichia coli (ATCC 25922) and Pseudomonas aeruginosa (ATCC 27853. The methanolic leaf extracts
exhibited the highest antibacterial activity, its minimum inhibitory concentration (MIC) ranging between 0.31
and 1.25 mg/ml; and its zones of inhibition on the various test microorganisms ranging between 8mm and 13
mm. The petroleum ether extracts had the weakest antibacterial activity, its minimum inhibitory concentration
(MIC) ranging between 2.50mg/ml and 5.00mg/ml and its inhibition zone ranging between 4mm and 8mm. The
phytochemical constituents present in the plant were alkaloids, tannins, saponins, cardiac glycosides, and
sterols. The methanolic extracts of the leaf exhibited potentially biological activity than other extracts. This
indicates that the plant leaf could be useful in the treatment of human infections caused by these pathogens. The
antibacterial activities of the methanolic leaf extract may be attributed to the presence of bioactive compounds.
Detection of Slime-Producing Staphylococcus aureus Strains Isolated from Food...Agriculture Journal IJOEAR
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The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
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Together with pharmaceutical residues, personal care products encompassing prescription drugs, fragrances, and cosmetics have been detected in groundwater and other aquatic environments, hence compromising the quality of water. Their classification as micropollutants is due to their antibacterial resistance potential, persistence, and ecotoxicity. Biodegradation has been identified as a potential mechanism in their removal. The focus of this study focus was bioaugmentation; (Bacillus subtilis, Escherichia coli, Staphylococcus aureus, and Pseudomonas aeroginosa) to enhance the degradation of Nevirapine and Trimethoprim in model aqueous solutions. A liquid chromatography-tandem mass spectrometer (LC-MS/MS) was used to determine the pharmaceuticals. The efficacy of the bacterial strains to degrade selected drugs was evaluated by making the two drugs the sole source of energy and carbon. From the experimental data, the highest percentage biodegradation was recorded; Pseudomonas aeroginosa (86 %) and Staphylococcus aureus (79 %) for TMP and NVP respectively.
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extracts of Jatrophacurcas the results obtained show mean zones of inhibition between (19 + 0.6mm) to (30 +
0.3mm) for aqueous extract and (24 + 0.5mm) to (35 + 0.8mm) for petroleum ether extract. Micro-organisms
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In Vitro Antibacterial Activities of Cochlospermum planchonii Roots Crude Ext...iosrjce
The antibacterial activities of the methanolic, hot water, chloroform and petroleum ether of
Cochlospermum planchonii root extracts on some clinical bacterial isolates and reference organisms were
investigated using conventional microbiological and microdilution indicator technique. Phytochemical
screenings were also carried on the extracts. The root extracts of the plant exhibited antibacterial activities
against reference strains and clinical isolates of Escherichia coli, Pseudomonas aeruginosa, Staphylococcus
aureus, Shigella flexneri, and Salmonella typhii. However, the susceptibility pattern of the bacteria did not
differ significantly from each other (p>0.05). The methanolic root extracts exhibited the highest antibacterial
activity, its minimum inhibitory concentration (MIC) ranging between 1.25 mg/ml and 5.00mg/ml; and its zones
of inhibition diameter on the various test microorganisms ranging between 8mm and 12mm. The petroleum
ether extracts had the weakest antibacterial activity, with minimum inhibitory concentration of 5.00mg/ml and
its zones of inhibition diameter ranging between 4mm and 7mm. The bioactive constituents in the plant were
alkaloids, tannins, saponins, cardiac glycosides, and sterols. The methanolic extracts of root appeared to be
more biologically active than other extracts and may be more useful in treating human infections caused by
these pathogens.
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Antibacterial Activity of Stem Bark Extracts of Oroxylum indicum an Endangere...IOSR Journals
The present work has been under taken to study the antibacterial activity of stem bark extracts of O.
indicum against disease causing gram negative and gram positive bacteria. Antimicrobial activity of solvent
extracts of stem bark of Oroxylum indicum has been studied to find out its activity against four important
bacterial strains Bacillus subtilis, B. cereus, Staphylococcus albus and S. aureus . The antimicrobial activity of
the stem bark extracts was done through well diffusion method and by measuring the inhibition zone around the
disc. The results revealed that the aqueous extracts of O. indicum exhibited antimicrobial activity against all the
microbes under study. The results provided evidence that the species O. indicum can be used as a potential
source of antimicrobial agent.
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
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All of this illustrated with link prediction over knowledge graphs, but the argument is general.
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International Journal of Pharmaceutical Science Invention (IJPSI)
1. International Journal of Pharmaceutical Science Invention
ISSN (Online): 2319 – 6718, ISSN (Print): 2319 – 670X
www.ijpsi.org Volume 2 Issue 8‖ August 2013 ‖ PP.09-13
www.ijpsi.org 9 | P a g e
In-Vitro Antibacterial Time-Kill Assay Of Phyllanthus Amarus
And Diodia Scandens Crude Extracts On Staphylococci Isolated
From Wounds And Burns Patients.
Ojo, S.K.S. *a1
, Ejims-Enukwe, O. b
, Esumeh, F.I. c
*a,b
Department of Biological Sciences, Novena University, Ogume, P.M.B. 2, Kwale, Delta State, Nigeria
c
Department of Microbiology, Ambrose Alli University, Ekpoma, P.M.B. 14, Ekpoma, Edo State, Nigeria
*a1
Department of Microbiology, Federal University, Oye-Ekiti, Ekiti State, Nigeria
ABSTRACT: Medicinal plants are sources of enormous quantities of phytochemical substances which are
able to initiate different biological activities including those useful in the treatment of human diseases. This
claim initiated the in vitro time-kill studies on the two plants using standard microbiological procedures. Crude
extracts of Phyllanthus amarus and Diodia scandens were investigated for the rate of time-kill on staphylococci
isolated from clinical samples. Biochemical test, β-lactamase assay, MIC and MBC were determined. The result
yielded an MIC value of 128µg/ml and 256µg/ml while the MBCs were at 256µg/ml. The time-kill assay
revealed a bactericidal effect on the isolated staphylococci ranging between 3.0log10 and 5.2log10cfu/ml for P.
amarus crude extract while for D. scandens crude extract ranges between 3.0log10 and 5.5log10cfu/ml.
KEY WORDS: time kill assay, staphylococci, medicinal plants, crude extracts
I. INTRODUCTION
Scientific investigation of medicinal plants used in folklore remedies have attracted increased attention
in the world of medicine, especially in a bid to finding lasting solutions to the problems multiple resistance to
the existing conventional antimicrobials (Aiyegoro et al., 2008). The therapeutic efficacy of many indigenous
plants for several disorders or ailments has been described by traditional medicine practitioners in India, Africa
and other parts of the world, which predates the introduction of antibiotics and other modern drugs into African
continent (Ojo et al., 2010; Shrivastava et al., 2009). Green medicine is safer and more dependable compared
with costly synthetic base, many of which had side effects (Joseph and Raj, 2011). Although several studies
have been conducted on P. amarus, there is still a paucity of information on the nature of bacterial inhibitions,
while information on D. scandens has been scanty.
The emergence of resistant microorganisms in hospitals and the community is causing problems for
both the treatment of patients and infection control. Organisms of particular concern include methicillin-
resistant Staphylococcus aureus (MRSA), glycopeptides-resistant enterococci (GRE), gentamicin-resistant and
extended-spectrum β-lactamase-producing Klebsiella and multi-resistant pseudomonads (May et al., 2000). A
recent major review of antibiotic resistance emphasized the importance of hospital infection control, and the
control of these organisms, and many authorities have reiterated the key role of hand-washing with appropriate
disinfectants in this process (Larson, 1995).Time-kill assay involves the determination of the rate of kill on the
plant extracts against tested organisms. Previous researchers have used MICs and MBCs as prediction tools for
antimicrobial action of plant crude extracts, thus limiting the use of such data since it does not consider time-
related antimicrobial effects, such as killing rate (Aiyegoro et al., 2009). The microbial killing potential of the
crude extracts of P. amarus and D. scandens in terms of the kinetics of bacterial death have not been reported.
This study will therefore evaluate the antibacterial and time-kill study of P. amarus and D. scandens, has part of
the ongoing exploration of indigenous plants for novel antimicrobial compounds.
II. MATERIALS AND METHODS
2.1 Sample Collection
The whole plants of P. amarus and D. scandens were harvested from Amai Community, Ukwuani
L.G.A in Delta State, Nigeria. It was rinsed in flowing tap water and air-dry for several weeks. The dried plants
were pulverized in an electric blender and stored in air-tight plastic bag till required for use.
2.2 Isolation and Species Identification
2. In-Vitro Antibacterial Time-Kill Assay Of…
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Fifty (50) clinical samples were obtained from wounds and burns patients at the General Hospital,
Kwale, Delta State and inoculated on freshly prepared nutrient agar and mannitol salt agar (Oxoid) slants using
sterile swab sticks. Slants were incubated at 37o
C for 24hrs.
Colonies growing on slants were streaked on freshly prepared mannitol salt agar (MSA) plates and
incubated at 35o
C. Primary characterization and identification of isolates was based on Gram stain,
morphological and cultural characteristics on different media, fermentation on MSA, catalase and coagulase
(tube) test.
2.3 Preparation of Extracts
The ethanolic extracts of the active ingredients of the plants were carried out using the method
described by Harbone (1994). 25g of the pulverized powdered plants were soxhlet extracted using 250ml of the
absolute ethanol. The extraction lasted for 6hrs and the volatile oil obtained was purified by filtration through
Whatman No.1 filter paper (Atata et al., 2003) and further sterilized through Millipore membrane filter (0.45µm
pore size) (Ronald, 1995). This was concentrated by evaporation using water bath at 50o
C until molten semi-
solid extracts were obtained (Mbata and Saika, 2008).
2.4 Susceptibility Testing
MICs for the staphylococcal isolates were determined by the micro dilution method recommended by
Clinical Laboratory Standards Institute (CLSI) (2008). Micro dilution plates were inoculated with 100µl of
Mueller-Hinton (MH) broth containing the appropriate antimicrobial (plant extracts) concentrations and a final
concentration of 105
cfu/ml of the test isolates. After an incubation of 24h at 35o
C, plates were examined for
turbidity, indicating growth. The MBCs were determined by plating out 0.1µl of the MIC on MH agar incubated
at 35o
C for 24h. Reference type S. aureus strain (ATCC 29523) was used as positive control.
2.5 Preparation of inocula for time-kill assay
Inocula for the time-kill determination were prepared as described by May et al. (2000). Organisms
were grown in Brain Heart Infusion (BHI) broth (Oxoid). The overnight broth was adjusted to a 0.5 McFarland
standard as described by CLSI (2008). The tubes for all isolates were shaken at 150rpm for 90mins at 37o
C to
ensure that organisms were out of their phases and into their logarithmic phases.
2.6 Time-kill (Bactericidal kinetic) assay
Bactericidal kinetic assay were performed in glass tubes containing 10ml of Mueller Hinton broth. The
extracts of P. amarus and D. scandens were used at the MIC and 2xMIC concentrations. An inoculums
containing approximately 5x105
cfu/ml was introduced into the Mueller Hinton broth containing various extracts
and incubated at 37o
C. 500µl sample was removed from culture at 6, 12, 18 and 24h, diluted serially and 100µl
of the diluted samples were inoculated on Mueller Hinton agar and incubated at 37o
C for 24h. Control include
extract free Mueller Hinton broth seeded with the test inoculums, viable counts were calculated to give cfu/ml,
and kill curves were plotted with time against logarithm of the viable count. Each experiment was performed in
duplicate and mean variance obtained.
2.7 Determining time-kill endpoints
A bactericidal effect is defined as 3log10 decrease in the cfu/ml or a 99.9% kill over a specified time.
The definition of kill for this study was as described by May et al. (2000) with modification. A constant
logarithmic rate of kill has been assumed during a time-kill. A 90% kill at 6h is equivalent to a 99% kill at 24h.
In this study, the kill measurement was determined by the actual reduction in viable counts at 6h for each isolate
and in comparison with 12, 18, and 24h time-kill period.
III RESULTS
Fifty (50) wounds and burns samples were analyzed in this study, obtaining 21 staphylococci isolates,
with 3(14%) as Coagulase-negative staphylococci (CoNS) and 18(86%) Coagulase positive S. aureus (Table 1).
The MICs of P. amarus crude extracts on various isolates ranged between 128µg/ml and 256µg/ml while MIC
for D. scandens was 256µg/ml. The MBCs of P. amarus and D. scandens were as observed in MIC (Table 2).
Table 3 showed the bactericidal activity of the crude extracts on staphylococci isolates at 6h intervals after
incubation. The average logarithm reduction in viable cell count for P. amarus crude extract ranged between
2.6log10cfu/ml and 4.0log10cfu/ml after 6h of incubation, 2.7log10cfu/ml and 3.8log10cfu/ml after 12h,
2.7log10cfu/ml and 4.3log10cfu/ml after 18h and 0log10cfu/ml and 5.2log10cfu/ml after 24h in 1xMIC and
2xMIC. For D. scandens crude extract, it ranges between 2.6log10cfu/ml and 4.0log10cfu/ml after 6h of
interaction, 2.6log10cfu/ml and 4.4log10cfu/ml after 12h, 2.7log10cfu/ml and 4.4log10cfu/ml after 18h, and
2.5log10cfu/ml and 5.5log10cfu/ml after 24h of interaction in 1Xmic and 2xMIC. The greatest reduction in cell
3. In-Vitro Antibacterial Time-Kill Assay Of…
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viability among the staphylococci isolates tested on P. amarus was 5.2log10cfu/ml while for D. scandens, it was
5.5log10cfu/ml. The S. aureus type ATCC 25923 tested on P. amarus had a higher cell reduction in density of
3.1log10cfu/ml as compared to that tested on D. scandens with 3.0log10cfu/ml.
Table1. Identification and biochemical characterization of wounds and burns isolates from hospital patients.
Biochemical test No. of staphylococcal isolates (%)
Positive Negative/others
Gram staining 21(42%) 29(58%)
Catalase 21 -
Coagulase 18(86%) 3(14%)
Mannitol fermentation 16(76%) 5(24%)
Table2. Determination of MIC and MBC of the staphylococci isolates on P. amarus and D. scandens crude
extracts
Isolate P. amarus D. scandens
No. MIC (µg/ml) MBC (µg/ml) MIC (µg/ml) MBC (µg/ml)
W44 128 NG 256 G
W39 128 NG 128 NG
W34GY 128 NG 256 G
B29 128 NG 128 G
B40M 128 NG 256 NG
W28 128 NG 256 NG
B18 128 NG 256 G
B7 128 NG 256 NG
B5 256 NG 256 NG
W42 256 NG 256 NG
W38 256 NG 256 NG
W37 256 NG 256 NG
W40GY 256 NG 256 NG
W25 256 NG 256 NG
W41 128 NG 256 G
B36 256 NG 256 NG
W33 128 NG 256 NG
W17 128 NG 256 NG
W10 256 NG 256 NG
B22 128 NG 256 NG
W19 128 NG 256 NG
S aureus (ATCC25923) 128 NG 256 NG
Key: GY- Golden Yellow, M- Milky, W- wound, B- burns, G- Growth, NG- No Growth
Table3. Nature of inhibition of crude extracts of P. amarus and D. scandens on wounds and burns staphylococci
Isolate 6h(log10kill) 12h(log10kill) 18h(log10kill) 24h(log10kill)
No MIC 2xMIC MIC 2xMIC MIC 2xMIC MIC 2xMIC
PA 42 *3.1 *3.3 *3.1 *3.4 2.8 *3.1 *3.0 *4.2
PA 7 *3.4 *3.4 *3.5 *3.6 2.7 *3.0 0 0
PA 39 2.7 *3.2 2.9 *3.5 *3.4 *3.9 *3.3 *4.6
PA29 2.7 *3.2 2.8 *3.2 *4.3 *4.1 *4.4 *4.7
PA41 2.7 *3.1 *3.1 *3.1 *3.1 *3.3 *3.0 *4.1
PA40M 2.6 *3.1 *3.1 *3.4 *3.0 *3.1 2.8 2.8
PA5 2.9 *3.4 *3.1 *3.6 2.8 *3.1 2.7 *3.4
PA28 *3.0 *3.2 *3.2 *3.3 *3.2 *3.5 *3.1 *3.1
PA34GY 2.7 2.8 2.7 2.9 2.8 *3.3 2.9 *3.8
PA38 *3.0 *3.6 *3.4 *3.8 2.8 *3.2 2.9 *3.8
PA44 2.7 *3.0 *3.3 *3.7 *3.1 *4.3 *3.0 *4.4
PA37 2.8 *3.1 *3.0 *3.3 *3.2 *4.0 *3.4 *4.3
PA33 *3.0 *3.5 *3.0 *3.6 2.9 *3.8 2.8 *5.2
PA18 2.6 2.6 2.7 2.7 2.8 2.8 *3.0 *3.8
PA ATCC *3.1 *3.1 2.9 2.9 *3.0 *3.0 2.6 2.6
DS29 *3.0 *3.0 *3.0 *3.0 *3.1 *3.5 2.9 2.9
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DS36 2.6 2.6 2.9 2.9 *3.0 *3.3 2.5 2.7
DS5 2.6 2.8 2.9 2.9 2.7 *3.2 *3.0 *3.0
DS19 *3.0 *3.3 *3.0 *3.4 *3.1 *3.7 2.9 *5.1
DS34GY *3.4 *4.0 *3.2 *4.4 *3.2 *3.7 *3.1 *5.5
DS40GY 2.7 *3.0 2.6 *3.0 2.9 2.9 2.8 *3.4
DS28 *3.0 *3.0 *3.0 *3.1 *3.1 *3.1 2.7 *3.7
DS39 2.7 2.7 2.9 *3.3 *3.0 *3.0 *3.0 *3.4
DS25 *3.0 *3.2 *3.1 *3.2 *3.1 *4.2 2.7 *3.5
DS38 2.6 *3.0 2.8 *3.1 2.9 2.9 *3.0 *3.0
DS7 2.9 *3.1 *3.0 *3.4 *3.1 *4.4 *3.0 *4.1
DS37 2.9 *3.0 *3.0 *3.0 2.8 *3.4 2.7 *5.5
DS33 *3.0 *3.6 *3.0 *3.8 2.9 *3.0 2.8 2.9
DS ATCC 2.6 2.6 2.9 2.9 2.7 2.7 *3.0 *3.0
Key: PA: isolates tested with P. amarus; DS: isolates tested with D. scandens; *: Bactericidal effect; PA
ATCC: S. aureus ATCC 25923 tested with P. amarus; DS ATCC: S. aureus ATCC 25923 tested with D.
scandens
Fig.1. Time-kill curve of Staphylococci by P. amarus crude extracts
Fig.2. Time-kill curve of Staphylococci by D. scandens crude extracts
IV DISCUSSION
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The incidence of multi-resistant Staphylococcus spp. to antibiotics of choice is increasing and is a
problem of global concern, which needs an urgent attention especially in the development of herbal drugs. The
results from this study evaluated the possible claim of P. amarus and D. scandens as having antimicrobial
properties used in folkloric medicines for the treatment of various human infections. The rate of killing as
demonstrated in this study with fixed concentration of the crude extracts has further proved the in vitro time-kill
assay as a reliable method in determining tolerance, thus conforming to earlier studies by Aiyegoro et al. (2008
and 2009), and May et al. (2009).
The time-kill study on P. amarus and especially D. scandens was the first to be reported with reference
to Aiyegoro et al. (2009), that the conventional bactericidal activity standard is a 3log10cfu/ml or greater
reduction in the viable colony number, which was achieved in this study. It was also observed in this study that
the rate of killing was high in 2xMIC (Fig.1&2) for the various hours under study indicating a higher
antimicrobial efficacy of the crude extracts against clinical staphylococci isolates. It could be ascertained from
this study that an increase in the concentration of extracts with time dependence could yield a better result. This
was similar to an earlier report by Aiyegoro et al. (2008) who worked on H. pendunculatum and observed a high
killing effect on 2xMIC at longer duration of interaction (12h). Although May et al. (2009) and Shrivastava et
al. (2009) concluded on 90% kill at 6h is equivalent to a 99.9% kill at 24h. However, this study which was
corroborated by Aiyegoro et al. (2008, 2009), revealed a longer duration (time dependent) of kill at 12h of
interaction.
V CONCLUSION
On the basis of the results reported in this study, we conclude that the crude extracts of P. amarus and
D. scandens exhibit significant antibacterial activity against tested staphylococci. It also suggests that these
plants are a potential candidate in bioprospecting for antimicrobial drugs. However, the rate of kill ascertained
from this study should be compared with the rate of kill from conventional antibiotics.
ACKNOWLEDGEMENT
We sincerely appreciate Prof. Ogi Okwumabua of Wisconsin University, U.S.A for the provision of
CLSI standards and Dr. Omumu and his team at the General Hospital, Kwale, Delta State, Nigeria for their
unflinching support during sample collection.
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