Submit Search
Upload
Botany session 7
•
1 like
•
129 views
F
Fluke Fox
Follow
Botany session 7
Read less
Read more
Health & Medicine
Report
Share
Report
Share
1 of 41
Recommended
Microbiology Ch 06 lecture_presentation
Microbiology Ch 06 lecture_presentation
TheSlaps
Pollen viability, storage & germination -A basic idea
Pollen viability, storage & germination -A basic idea
Nistarini College, Purulia (W.B) India
paper biofertilizer
paper biofertilizer
Mayank Ameta
Rhizobium
Rhizobium
Rachana Choudhary
Biofertilizers and mycorryza
Biofertilizers and mycorryza
Dr. Naveen Gaurav srivastava
Fruit Ripening and Changes occurring during Ripening
Fruit Ripening and Changes occurring during Ripening
pavanknaik
Mycorrhizae types and applications
Mycorrhizae types and applications
Nischitha R
Fungal metabolites as a store house of bioactive natural products
Fungal metabolites as a store house of bioactive natural products
RAMESHVELCHAMY
Recommended
Microbiology Ch 06 lecture_presentation
Microbiology Ch 06 lecture_presentation
TheSlaps
Pollen viability, storage & germination -A basic idea
Pollen viability, storage & germination -A basic idea
Nistarini College, Purulia (W.B) India
paper biofertilizer
paper biofertilizer
Mayank Ameta
Rhizobium
Rhizobium
Rachana Choudhary
Biofertilizers and mycorryza
Biofertilizers and mycorryza
Dr. Naveen Gaurav srivastava
Fruit Ripening and Changes occurring during Ripening
Fruit Ripening and Changes occurring during Ripening
pavanknaik
Mycorrhizae types and applications
Mycorrhizae types and applications
Nischitha R
Fungal metabolites as a store house of bioactive natural products
Fungal metabolites as a store house of bioactive natural products
RAMESHVELCHAMY
Production of Biofertilizers
Production of Biofertilizers
gi55
Cultivation of drugs
Cultivation of drugs
GOWRISANKARCHINTAPAL
PLANT TISSUE CULTURE
PLANT TISSUE CULTURE
GOWRISANKARCHINTAPAL
Arbuscular mycorrhizal fungi (Glomus mosseae) selection by date palm root sys...
Arbuscular mycorrhizal fungi (Glomus mosseae) selection by date palm root sys...
AI Publications
Microbes in biological control,Fermentation and enzyme technology
Microbes in biological control,Fermentation and enzyme technology
Gowri Prabhu
Studies of biodegradation of ipomea carnea weed from kavinadu big tank in pud...
Studies of biodegradation of ipomea carnea weed from kavinadu big tank in pud...
Alexander Decker
Cold storage of scion, pollen and seed & plant quarentine for fruit crop
Cold storage of scion, pollen and seed & plant quarentine for fruit crop
AjaykumarKarna
About Actinomycin
About Actinomycin
Tushar Roy
Secondary metabolites
Secondary metabolites
Mazin-Salim Almazini
Seconadry metabolites
Seconadry metabolites
Ritasree Sarma
BIO-PESTICIDE
BIO-PESTICIDE
Saiful Irwan Zubairi
Seed dormancy
Seed dormancy
pavanknaik
Biofertilizers
Biofertilizers
Niharika Srivastava
Plant tissue culture media components
Plant tissue culture media components
HORTIPEDIA INDIA
Secondary metabolites
Secondary metabolites
Dr. Naveen Gaurav srivastava
BIO FERTILIZER
BIO FERTILIZER
Anusha Aditya
Wide spectrum applications of Bacterial and Fungal pigments
Wide spectrum applications of Bacterial and Fungal pigments
Sushil Patel
BIOFERTILLIZERS.GROUPS OF BIOFERTILLIZERS.SCOPE AND FUTURE PERSPECTIVE OF BI...
BIOFERTILLIZERS.GROUPS OF BIOFERTILLIZERS.SCOPE AND FUTURE PERSPECTIVE OF BI...
Muhammad Abdullah Saleem
introduction to mycorrhizae and its role in P uptake
introduction to mycorrhizae and its role in P uptake
Fari Rajput
Narendra credit seminar 2
Narendra credit seminar 2
narendra singh bhandari
Botany session 8
Botany session 8
Fluke Fox
Role of Bioactive Compounds.pptx
Role of Bioactive Compounds.pptx
PrabhatSingh628463
More Related Content
What's hot
Production of Biofertilizers
Production of Biofertilizers
gi55
Cultivation of drugs
Cultivation of drugs
GOWRISANKARCHINTAPAL
PLANT TISSUE CULTURE
PLANT TISSUE CULTURE
GOWRISANKARCHINTAPAL
Arbuscular mycorrhizal fungi (Glomus mosseae) selection by date palm root sys...
Arbuscular mycorrhizal fungi (Glomus mosseae) selection by date palm root sys...
AI Publications
Microbes in biological control,Fermentation and enzyme technology
Microbes in biological control,Fermentation and enzyme technology
Gowri Prabhu
Studies of biodegradation of ipomea carnea weed from kavinadu big tank in pud...
Studies of biodegradation of ipomea carnea weed from kavinadu big tank in pud...
Alexander Decker
Cold storage of scion, pollen and seed & plant quarentine for fruit crop
Cold storage of scion, pollen and seed & plant quarentine for fruit crop
AjaykumarKarna
About Actinomycin
About Actinomycin
Tushar Roy
Secondary metabolites
Secondary metabolites
Mazin-Salim Almazini
Seconadry metabolites
Seconadry metabolites
Ritasree Sarma
BIO-PESTICIDE
BIO-PESTICIDE
Saiful Irwan Zubairi
Seed dormancy
Seed dormancy
pavanknaik
Biofertilizers
Biofertilizers
Niharika Srivastava
Plant tissue culture media components
Plant tissue culture media components
HORTIPEDIA INDIA
Secondary metabolites
Secondary metabolites
Dr. Naveen Gaurav srivastava
BIO FERTILIZER
BIO FERTILIZER
Anusha Aditya
Wide spectrum applications of Bacterial and Fungal pigments
Wide spectrum applications of Bacterial and Fungal pigments
Sushil Patel
BIOFERTILLIZERS.GROUPS OF BIOFERTILLIZERS.SCOPE AND FUTURE PERSPECTIVE OF BI...
BIOFERTILLIZERS.GROUPS OF BIOFERTILLIZERS.SCOPE AND FUTURE PERSPECTIVE OF BI...
Muhammad Abdullah Saleem
introduction to mycorrhizae and its role in P uptake
introduction to mycorrhizae and its role in P uptake
Fari Rajput
Narendra credit seminar 2
Narendra credit seminar 2
narendra singh bhandari
What's hot
(20)
Production of Biofertilizers
Production of Biofertilizers
Cultivation of drugs
Cultivation of drugs
PLANT TISSUE CULTURE
PLANT TISSUE CULTURE
Arbuscular mycorrhizal fungi (Glomus mosseae) selection by date palm root sys...
Arbuscular mycorrhizal fungi (Glomus mosseae) selection by date palm root sys...
Microbes in biological control,Fermentation and enzyme technology
Microbes in biological control,Fermentation and enzyme technology
Studies of biodegradation of ipomea carnea weed from kavinadu big tank in pud...
Studies of biodegradation of ipomea carnea weed from kavinadu big tank in pud...
Cold storage of scion, pollen and seed & plant quarentine for fruit crop
Cold storage of scion, pollen and seed & plant quarentine for fruit crop
About Actinomycin
About Actinomycin
Secondary metabolites
Secondary metabolites
Seconadry metabolites
Seconadry metabolites
BIO-PESTICIDE
BIO-PESTICIDE
Seed dormancy
Seed dormancy
Biofertilizers
Biofertilizers
Plant tissue culture media components
Plant tissue culture media components
Secondary metabolites
Secondary metabolites
BIO FERTILIZER
BIO FERTILIZER
Wide spectrum applications of Bacterial and Fungal pigments
Wide spectrum applications of Bacterial and Fungal pigments
BIOFERTILLIZERS.GROUPS OF BIOFERTILLIZERS.SCOPE AND FUTURE PERSPECTIVE OF BI...
BIOFERTILLIZERS.GROUPS OF BIOFERTILLIZERS.SCOPE AND FUTURE PERSPECTIVE OF BI...
introduction to mycorrhizae and its role in P uptake
introduction to mycorrhizae and its role in P uptake
Narendra credit seminar 2
Narendra credit seminar 2
Similar to Botany session 7
Botany session 8
Botany session 8
Fluke Fox
Role of Bioactive Compounds.pptx
Role of Bioactive Compounds.pptx
PrabhatSingh628463
Phytochemistry
Phytochemistry
Kaviya107300
Samani
Samani
kamrudeen samani
Lignans
Lignans
sabalRegmi
Lecture# 01& 02 Inroduction to natural products.pptx
Lecture# 01& 02 Inroduction to natural products.pptx
Nisha869594
Introduction 4
Introduction 4
Ahmed Metwaly
Primary Metabolites PHARMACOGNOSY-I.pptx
Primary Metabolites PHARMACOGNOSY-I.pptx
Government Pharmacy College Sajong, Government of Sikkim
Primary Metabolites FROM THE PLANT AND ANIMALS.pptx
Primary Metabolites FROM THE PLANT AND ANIMALS.pptx
Government Pharmacy College Sajong, Government of Sikkim
PHYTOCHEMISTRY ASSIGNMENT FOR PHARMACOGNOSY
PHYTOCHEMISTRY ASSIGNMENT FOR PHARMACOGNOSY
Ganugavade
Phytochemistry of carbohydrates ii
Phytochemistry of carbohydrates ii
Mostafa Mahmoud Hegazy
Biomolecules.pdf
Biomolecules.pdf
ashaqbari
Biomacromolecules and nucleic acids
Biomacromolecules and nucleic acids
HARINATHA REDDY ASWARTHA
prodrugs.pptx
prodrugs.pptx
KomalJAIN122
NUTRACEUTICAL AND FUCTIONAL FOODS
NUTRACEUTICAL AND FUCTIONAL FOODS
SukhveerSingh31
Ergot alkaloids.pptx
Ergot alkaloids.pptx
Ved Gharat
Chemistry of Lipids
Chemistry of Lipids
Justine Ilagan
Secondary Metabolites.pptx
Secondary Metabolites.pptx
Yusaira Fakhar
Secondary Metabolits
Secondary Metabolits
LakshmiShanmugam8
Biosynthesis and pharmaceutical applications of alkaloids [autosaved]
Biosynthesis and pharmaceutical applications of alkaloids [autosaved]
JasmineJuliet
Similar to Botany session 7
(20)
Botany session 8
Botany session 8
Role of Bioactive Compounds.pptx
Role of Bioactive Compounds.pptx
Phytochemistry
Phytochemistry
Samani
Samani
Lignans
Lignans
Lecture# 01& 02 Inroduction to natural products.pptx
Lecture# 01& 02 Inroduction to natural products.pptx
Introduction 4
Introduction 4
Primary Metabolites PHARMACOGNOSY-I.pptx
Primary Metabolites PHARMACOGNOSY-I.pptx
Primary Metabolites FROM THE PLANT AND ANIMALS.pptx
Primary Metabolites FROM THE PLANT AND ANIMALS.pptx
PHYTOCHEMISTRY ASSIGNMENT FOR PHARMACOGNOSY
PHYTOCHEMISTRY ASSIGNMENT FOR PHARMACOGNOSY
Phytochemistry of carbohydrates ii
Phytochemistry of carbohydrates ii
Biomolecules.pdf
Biomolecules.pdf
Biomacromolecules and nucleic acids
Biomacromolecules and nucleic acids
prodrugs.pptx
prodrugs.pptx
NUTRACEUTICAL AND FUCTIONAL FOODS
NUTRACEUTICAL AND FUCTIONAL FOODS
Ergot alkaloids.pptx
Ergot alkaloids.pptx
Chemistry of Lipids
Chemistry of Lipids
Secondary Metabolites.pptx
Secondary Metabolites.pptx
Secondary Metabolits
Secondary Metabolits
Biosynthesis and pharmaceutical applications of alkaloids [autosaved]
Biosynthesis and pharmaceutical applications of alkaloids [autosaved]
More from Fluke Fox
Herbal Cultivation session 5
Herbal Cultivation session 5
Fluke Fox
Herbal Cultivation session 7
Herbal Cultivation session 7
Fluke Fox
Herbal Cultivation session 10
Herbal Cultivation session 10
Fluke Fox
Herbal Cultivation session 9
Herbal Cultivation session 9
Fluke Fox
Herbal Cultivation session 11
Herbal Cultivation session 11
Fluke Fox
Herbal Cultivation session 3
Herbal Cultivation session 3
Fluke Fox
Herbal Cultivation session 2
Herbal Cultivation session 2
Fluke Fox
Herbal Cultivation session 1
Herbal Cultivation session 1
Fluke Fox
Herbal Cultivation session 6
Herbal Cultivation session 6
Fluke Fox
Botany session 9
Botany session 9
Fluke Fox
Botany session 6
Botany session 6
Fluke Fox
Botany session 5
Botany session 5
Fluke Fox
Botany session 3
Botany session 3
Fluke Fox
Botany session 2
Botany session 2
Fluke Fox
Botany session 4
Botany session 4
Fluke Fox
Botany session 12
Botany session 12
Fluke Fox
Botany session 11
Botany session 11
Fluke Fox
Botany session 1
Botany session 1
Fluke Fox
More from Fluke Fox
(18)
Herbal Cultivation session 5
Herbal Cultivation session 5
Herbal Cultivation session 7
Herbal Cultivation session 7
Herbal Cultivation session 10
Herbal Cultivation session 10
Herbal Cultivation session 9
Herbal Cultivation session 9
Herbal Cultivation session 11
Herbal Cultivation session 11
Herbal Cultivation session 3
Herbal Cultivation session 3
Herbal Cultivation session 2
Herbal Cultivation session 2
Herbal Cultivation session 1
Herbal Cultivation session 1
Herbal Cultivation session 6
Herbal Cultivation session 6
Botany session 9
Botany session 9
Botany session 6
Botany session 6
Botany session 5
Botany session 5
Botany session 3
Botany session 3
Botany session 2
Botany session 2
Botany session 4
Botany session 4
Botany session 12
Botany session 12
Botany session 11
Botany session 11
Botany session 1
Botany session 1
Recently uploaded
Top Rated Bangalore Call Girls Mg Road ⟟ 8250192130 ⟟ Call Me For Genuine Sex...
Top Rated Bangalore Call Girls Mg Road ⟟ 8250192130 ⟟ Call Me For Genuine Sex...
narwatsonia7
Call Girls Ooty Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Ooty Just Call 9907093804 Top Class Call Girl Service Available
Dipal Arora
Call Girls Aurangabad Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Aurangabad Just Call 9907093804 Top Class Call Girl Service Available
Dipal Arora
Escort Service Call Girls In Sarita Vihar,, 99530°56974 Delhi NCR
Escort Service Call Girls In Sarita Vihar,, 99530°56974 Delhi NCR
9953056974 Low Rate Call Girls In Saket, Delhi NCR
High Profile Call Girls Coimbatore Saanvi☎️ 8250192130 Independent Escort Se...
High Profile Call Girls Coimbatore Saanvi☎️ 8250192130 Independent Escort Se...
narwatsonia7
Kesar Bagh Call Girl Price 9548273370 , Lucknow Call Girls Service
Kesar Bagh Call Girl Price 9548273370 , Lucknow Call Girls Service
makika9823
Vip Call Girls Anna Salai Chennai 👉 8250192130 ❣️💯 Top Class Girls Available
Vip Call Girls Anna Salai Chennai 👉 8250192130 ❣️💯 Top Class Girls Available
Nehru place Escorts
Call Girls Cuttack Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Cuttack Just Call 9907093804 Top Class Call Girl Service Available
Dipal Arora
VIP Service Call Girls Sindhi Colony 📳 7877925207 For 18+ VIP Call Girl At Th...
VIP Service Call Girls Sindhi Colony 📳 7877925207 For 18+ VIP Call Girl At Th...
jageshsingh5554
Premium Call Girls Cottonpet Whatsapp 7001035870 Independent Escort Service
Premium Call Girls Cottonpet Whatsapp 7001035870 Independent Escort Service
vidya singh
Bangalore Call Girls Nelamangala Number 7001035870 Meetin With Bangalore Esc...
Bangalore Call Girls Nelamangala Number 7001035870 Meetin With Bangalore Esc...
narwatsonia7
Best Rate (Hyderabad) Call Girls Jahanuma ⟟ 8250192130 ⟟ High Class Call Girl...
Best Rate (Hyderabad) Call Girls Jahanuma ⟟ 8250192130 ⟟ High Class Call Girl...
astropune
Bangalore Call Girls Hebbal Kempapura Number 7001035870 Meetin With Bangalor...
Bangalore Call Girls Hebbal Kempapura Number 7001035870 Meetin With Bangalor...
narwatsonia7
Chandrapur Call girls 8617370543 Provides all area service COD available
Chandrapur Call girls 8617370543 Provides all area service COD available
Dipal Arora
Call Girls Service Surat Samaira ❤️🍑 8250192130 👄 Independent Escort Service ...
Call Girls Service Surat Samaira ❤️🍑 8250192130 👄 Independent Escort Service ...
CALL GIRLS
Call Girls Coimbatore Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Coimbatore Just Call 9907093804 Top Class Call Girl Service Available
Dipal Arora
Call Girl Number in Vashi Mumbai📲 9833363713 💞 Full Night Enjoy
Call Girl Number in Vashi Mumbai📲 9833363713 💞 Full Night Enjoy
babeytanya
Call Girl Coimbatore Prisha☎️ 8250192130 Independent Escort Service Coimbatore
Call Girl Coimbatore Prisha☎️ 8250192130 Independent Escort Service Coimbatore
narwatsonia7
Call Girls Varanasi Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Varanasi Just Call 9907093804 Top Class Call Girl Service Available
Dipal Arora
The Most Attractive Hyderabad Call Girls Kothapet 𖠋 6297143586 𖠋 Will You Mis...
The Most Attractive Hyderabad Call Girls Kothapet 𖠋 6297143586 𖠋 Will You Mis...
chandars293
Recently uploaded
(20)
Top Rated Bangalore Call Girls Mg Road ⟟ 8250192130 ⟟ Call Me For Genuine Sex...
Top Rated Bangalore Call Girls Mg Road ⟟ 8250192130 ⟟ Call Me For Genuine Sex...
Call Girls Ooty Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Ooty Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Aurangabad Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Aurangabad Just Call 9907093804 Top Class Call Girl Service Available
Escort Service Call Girls In Sarita Vihar,, 99530°56974 Delhi NCR
Escort Service Call Girls In Sarita Vihar,, 99530°56974 Delhi NCR
High Profile Call Girls Coimbatore Saanvi☎️ 8250192130 Independent Escort Se...
High Profile Call Girls Coimbatore Saanvi☎️ 8250192130 Independent Escort Se...
Kesar Bagh Call Girl Price 9548273370 , Lucknow Call Girls Service
Kesar Bagh Call Girl Price 9548273370 , Lucknow Call Girls Service
Vip Call Girls Anna Salai Chennai 👉 8250192130 ❣️💯 Top Class Girls Available
Vip Call Girls Anna Salai Chennai 👉 8250192130 ❣️💯 Top Class Girls Available
Call Girls Cuttack Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Cuttack Just Call 9907093804 Top Class Call Girl Service Available
VIP Service Call Girls Sindhi Colony 📳 7877925207 For 18+ VIP Call Girl At Th...
VIP Service Call Girls Sindhi Colony 📳 7877925207 For 18+ VIP Call Girl At Th...
Premium Call Girls Cottonpet Whatsapp 7001035870 Independent Escort Service
Premium Call Girls Cottonpet Whatsapp 7001035870 Independent Escort Service
Bangalore Call Girls Nelamangala Number 7001035870 Meetin With Bangalore Esc...
Bangalore Call Girls Nelamangala Number 7001035870 Meetin With Bangalore Esc...
Best Rate (Hyderabad) Call Girls Jahanuma ⟟ 8250192130 ⟟ High Class Call Girl...
Best Rate (Hyderabad) Call Girls Jahanuma ⟟ 8250192130 ⟟ High Class Call Girl...
Bangalore Call Girls Hebbal Kempapura Number 7001035870 Meetin With Bangalor...
Bangalore Call Girls Hebbal Kempapura Number 7001035870 Meetin With Bangalor...
Chandrapur Call girls 8617370543 Provides all area service COD available
Chandrapur Call girls 8617370543 Provides all area service COD available
Call Girls Service Surat Samaira ❤️🍑 8250192130 👄 Independent Escort Service ...
Call Girls Service Surat Samaira ❤️🍑 8250192130 👄 Independent Escort Service ...
Call Girls Coimbatore Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Coimbatore Just Call 9907093804 Top Class Call Girl Service Available
Call Girl Number in Vashi Mumbai📲 9833363713 💞 Full Night Enjoy
Call Girl Number in Vashi Mumbai📲 9833363713 💞 Full Night Enjoy
Call Girl Coimbatore Prisha☎️ 8250192130 Independent Escort Service Coimbatore
Call Girl Coimbatore Prisha☎️ 8250192130 Independent Escort Service Coimbatore
Call Girls Varanasi Just Call 9907093804 Top Class Call Girl Service Available
Call Girls Varanasi Just Call 9907093804 Top Class Call Girl Service Available
The Most Attractive Hyderabad Call Girls Kothapet 𖠋 6297143586 𖠋 Will You Mis...
The Most Attractive Hyderabad Call Girls Kothapet 𖠋 6297143586 𖠋 Will You Mis...
Botany session 7
1.
© Copyright PCNM
2011 Botany and Pharmacognosy Session 7
2.
© Copyright PCNM
2011 Review Last week we covered: • Ethnobotony
3.
© Copyright PCNM
2011 This Session During this session we will cover: • Phytochemistry, Part I
4.
© Copyright PCNM
2011 Phytochemistry • Phytochemistry is the study of phytochemicals (plant constituents) derived from plants. It is considered a sub field of botany and chemistry. • The application of phytochemistry is pharmacognosy or the discovery of new medicines sourced from plants. • Plant constituents the chemicals in plants that exert a therapeutic effect.
5.
© Copyright PCNM
2011 Phytochemistry • Metabolic and biochemical pathways within plants are essential for their survival. • A well known biochemical pathway is photosynthesis. Whereby chlorophyll in the leaves converts energy from sunlight into glucose and oxygen from carbon dioxide and water from the environment. • All chemical compounds found in plants are derived from a few well studied metabolic pathways using products of photosynthesis
6.
© Copyright PCNM
2011 Phytochemistry • Plants produce two types of metabolites – primary and secondary. Primary Metabolites • These are necessary to sustain the life of the plant and include enzymes and other proteins, lipids, carbohydrates and chlorophyll.
7.
© Copyright PCNM
2011 Phytochemistry Secondary Metabolites • These do not appear to be necessary to sustain life but instead act as protection and defence. Due to the immobility of plants in diverse and changing environments, along with the possibility of attack by animals and pathogens, plants have developed these secondary metabolises for protection.
8.
© Copyright PCNM
2011 Phytochemistry • In recent years particular attention has been paid to the specific ecological roles of these secondary metabolites, that were once thought of as waste products, are now being researched for their medicinal properties. • Alkaloids are thought to play a defensive role in plants against herbivores and pathogens. • Tannins act to preserve the wood in living trees from microbial decomposition and insects. • Several classes of secondary metabolites are induced by infection, wounding or grazing.
9.
© Copyright PCNM
2011 Phytochemistry • The main constituent groups • Simple Phenols and Glycosides • Glucosinolates • Mucilages • Essential Oils • Flavonoids • Tannins and Oligomeric Procyanidins • Resins • Bitters • Pungent Constituents • Saponins • Anthraquinones • Coumarins • Phytooestrogens • Alkaloids
10.
© Copyright PCNM
2011 Simple Phenols and Glycosides • Phenols comprise the largest group of plant secondary metabolites. They range from simple structures with only one benzene ring to larger molecules such as tannins, anthraquinones, flavonoids and coumarins. • They are defined as compounds that have at least one hydroxyl group attached to a benzene ring.
11.
© Copyright PCNM
2011 Simple Phenols and Glycosides • Phenols differ in their chemical properties from other tertiary alcohols because the presence of the benzene ring stabilises the phenolate ion and therefore are more acidic and more reactive. • Phenolic acids are a special class of simple phenols which in addition have at least one carboxylic acid group. Examples include: • Gallic acid – Witch hazel • Salicylic acid - Willow • Caffeic acid – Globe Artichoke • Vanillic acid – Dong quai • Some of these compounds are sometimes called pseutannins, as they have astringent characteristics but lack all the properties of true tannins.
12.
© Copyright PCNM
2011 Simple Phenols and Glycosides • Glycosides are secondary metabolites that yield one or more sugars on hydrolysis. The most frequently occurring sugar is glucose (i.e. Glycoside). The non-sugar component of the molecule, which may be a simple phenol, flavonoid, anthraquinone, triterpenoid or many other structures, is called the aglycone. Glycosides may also bond to oxygen and carbon molecules. • The glycoside linkage is usually resistant to human digestive enzymes and glycosides are often poorly absorbed from the digestive tract. As a result they travel to the large intestines where microbial activity forms the aglycone, which is then absorbed into the bloodstream.
13.
© Copyright PCNM
2011 Simple Phenols and Glycosides Cyanogenic Glycosides • Cyanogenic glycosides are capable of generating hydrocyanic acid (cyanide). Structurally they are glycosides of 2- hydroxynitriles which can be hydrolysed by the enzyme beta-glucosidase into cyanohydrin. This is unstable and dissociates to hydrocyanic acid. Examples are: • Amygdalin – bitter almonds and peach kernels • Prunasin – Wild Cherry Bark
14.
© Copyright PCNM
2011 Simple Phenols and Glycosides • Although hydrocyanic acid is a violent poison, oral intake of cyanogenic glycosides is not necessarily toxic. Hydrolysis of the glycosides in the digestive tract or by the liver leads to a slow release of hydrocyanic acid which can be readily detoxified by the body. Wild Cherry
15.
© Copyright PCNM
2011 Simple Phenols and Glycosides • Interest arose in the 1970’s in the use of a synthetic cyanogenic glycoside as an alternative anticancer compound. The theory was that cancer tissues contain beta-glucosidase and that circulating cyanogenic glycosides would therefore act as selective cytotoxic agents. However, amygdalin did not prove to be an effective anticancer agent, presumably because the beta-glucosidase activity of cancer cells is quite low. • Amygdalin given orally to humans at 500mg three times a day produced no toxic effects and only moderately raised blood cyanide levels. A study published in the Journal of American Medical Association.
16.
© Copyright PCNM
2011 Simple Phenols and Glycosides Cardiac Glycosides • Are also known as cardioactive glycosides . They are steroidal glycosides that are similar to but also very different from steroidal saponins. They constitute a well defined and highly homogeneous group from both a structural and a pharmacological perspective. • Cardiac glycosides have been used as conventional medicine drugs for 200 years and are still widely used today e.g. Digoxin. Digitalis purpurea
17.
© Copyright PCNM
2011 Simple Phenols and Glycosides Cardiac Glycosides • There are two types which have either a steroidal aglycone with 23 carbons (the cardenolide glycosides) or 24 carbons (the bufadienolide glycosides). The sugar part usually consists of 2-4 sugars joined together.
18.
© Copyright PCNM
2011 Glucosinolates • Glucosinolates are sulphur and nitrogen containing glycosides which are responsible for the pungent properties of horseradish, nasturtium and mustard. The glucosinolate itself is not pungent. When it comes into contact with the enzyme myrosinase, stored in another compartment of the cell, the aglycone is formed which usually rearranges into the pungent and corrosive isothiocyanate.
19.
© Copyright PCNM
2011 Glucosinolates • Isothiocyanates can also be formed from glucosinolates by steam distillation and so are called mustard oils. For this reason they are sometimes classified as essential oils. Mustard field
20.
© Copyright PCNM
2011 Glucosinolates • The glucosinolates are ionic in nature and occur in the plant as potassium salts. • Glucosinolates are also found in brassicas such as cabbage, broccoli and Brussels sprouts. As such they are frequently consumed as a normal part of a human diet.
21.
© Copyright PCNM
2011 Checkpoint!
22.
© Copyright PCNM
2011 Mucilages • Mucilages are generally not chemically well defined. They are large, highly branched polymeric structures built from many different sugar and uronic acid units. They are hydrophilic and are capable of trapping water in their cage-like structures to form a gel. • When a mucilage is mixed with water it swells to many times its original volume as it absorbs water. The beta configuration of the saccharide linkages inhibits the breakdown of mucilages by human digestive enzymes. However they can be partially decomposed by bowel flora into short chain fatty acids.
23.
© Copyright PCNM
2011 Mucilages • Not only do mucilages soothe the gut but the short chain fatty acids formed in the colon provide a source of readily absorbed and assimilated nourishment. Marshmallow
24.
© Copyright PCNM
2011 Mucilages • Mucilaginous remedies have been primarily used for topical emollient and demulcent properties and their direct benefits in the management of inflammatory conditions of the digestive system. • The protective effect of mucilages isolated from Plantago major (greater plantain) and guar-gum provide an extra barrier against gastric acid and has been shown to reverse aspirin induced gastric ulcers due to an anti-inflammatory action. Plantago major
25.
© Copyright PCNM
2011 Mucilages • Mucilages also function as bulk laxatives and are a class of soluble fibre. Examples are: • Psyllium • Linseed • Fenugreek • Slippery elm • Marshmallow root
26.
© Copyright PCNM
2011 Mucilages • They are also used as reflex demulcents especially to ease irritable dry coughs. The reflect effect is postulated to be mediated by the vagus nerve whereby the demulcent effect on the upper digestive tract soothes the bronchial mucosa. Similar associations are used for the use of mucilages in urinary tract conditions. Corn silk
27.
© Copyright PCNM
2011 Mucilages • Since mucilages are water soluble and relatively insoluble in ethanol, liquid galenical preparations of mucilages are not appropriate, except for their use as reflex demulcents). For demulcent effects in the digestive tract mucilages are best given as powders or capsules. Psyllium
28.
© Copyright PCNM
2011 Essential Oils • Essential oils are mixtures of fragrant compounds which can be isolated from plants by the process of steam distillation. Since they are volatile in steam and usually have pronounced aromas, essential oils are often referred to as volatile oils. • Essential oils are important items of commerce being used for perfumes, food flavourings, personal care products and pharmaceutical products. They are also used for aromatherapy.
29.
© Copyright PCNM
2011 Essential Oils • Essential oils are water insoluble oily liquids which are usually colourless. They are not chemically related to lipid oils or hydrocarbon oils. They will slowly evaporate if left in an open container and placing a drop of oil on blotting paper can be used as a simple technique to test for adulteration with a fixed oil. If a fixed oil is present an oily smear will remain on the paper a few days later.
30.
© Copyright PCNM
2011 Essential Oils • Adulteration is an important issue in essential oils and many techniques have been developed to imitate and extend essential oils. For example oil of wintergreen the trade in the synthetic oil has completely supplanted the natural product. • This issues does not apply for oils prescribed as part of the whole plant extract as used by herbalists.
31.
© Copyright PCNM
2011 Essential Oils • The synthesis and accumulation of essential oils are generally associated with the presence of specialised structures in the plant which are often located on or near the surface. • For example the delicate glandular hairs of the Lamiaceae (mint) family.
32.
© Copyright PCNM
2011 Essential Oils • Essential oil composition can very quite dramatically within a species and often distinct chemotypes are recognised. This means the same species can produce quite different oils in terms of chemistry, pharmacology and toxicology. The components of essential oils can be classified into two major groups: • Terpenoids • Phenylpropanoids
33.
© Copyright PCNM
2011 Essential Oils Terpenoids • Terpenoids are constructed from a five carbon isoprene unit. Plants produce terpenoids using the mevalonic acid biosynthetic pathway. • Naming of terpenoids is based on multiples of 10 carbons (two isoprene units). Hence molecules with 10 carbons are called monoterpenes, those with 15 are called sesquiterpenes (sesqui means one and a half). • Only mono and sesquiterpenes are found in essential oils. Higher terpenoids are too large and are not volatile in steam. However, diterpenes occur in resins as resin acids and triterpenes are found in saponins. • Not even all mono and sesquiterpenes are volatile in steam, as the iridoids in eyebright are one example.
34.
© Copyright PCNM
2011 Essential Oils • Examples of monoterpenes in essential oils include • Limonene – citrus fruit • Geraniol - Rose and citronella • Borneol - Camphor • Thujone – Thuja and wormwood
35.
© Copyright PCNM
2011 Essential Oils • Phenylpropanoids are far less common as components of essential oils. Their basic chemical skeleton is a three carbon chain attached to a benzene ring. They are formed by the shikimic acid biosynthetic pathway. Examples are: • Anethole - Aniseed and fennel • Eugenol – Clove and nutmeg
36.
© Copyright PCNM
2011 Essential Oils • Essential oil components can also be classified according to their functional groups. The most common compounds found in essential oils are hydrocarbons, alcohols, aldehydes, ketones, phenols, oxides and esters. These functional groups play a large part in determining the pharmacology and toxicology of essential oil components.
37.
© Copyright PCNM
2011 Essential Oils • Essential oil components often exhibit optical isomerism (where the two isomers are mirror images of each other). For example (+)-carvone isolated from caraway oil has a caraway like odour and (-)-carvone isolated from spearmint oil has a spearmint like odour.
38.
© Copyright PCNM
2011 Checkpoint!
39.
© Copyright PCNM
2011 Summary Today we covered • Phytochemistry, Part I
40.
© Copyright PCNM
2011 Next Session We will cover: • Phytochemistry, Part II
41.
© Copyright PCNM
2011 Preparation Brief Notes • Don’t forget to log on to the LMS and download and print off your brief notes and handouts for the next session.