Non-aqueous titrations allow for the titration of substances that cannot be titrated in aqueous solutions, such as mixtures of acids/bases, organic acids/bases insoluble in water, and very weak acids/bases. Solvents used include acetic acid, acetonitrile, alcohols, and DMF. Indicators change color in acidic and basic conditions. Common titrations include primary/secondary/tertiary amines with perchloric acid and acids with sodium/potassium methoxide. Proper preparation of titrants and indicators, choice of solvent, and accounting for temperature effects are important for accurate non-aqueous titrations.
Learning objectives
Introduction
Types of solvents
Acidimetry in non aqueous medium
Alkalimetry in non aqueous medium
Estimation of Sodium benzoate and Ephedrine HCl
Applications of non aqueous titrations in pharmacy
Conclusion
Reference
The need for non aqueous titration arises because water can behave as a weak base and a weak acid as well, and can hence compete in proton acceptance or proton donation with other weak acids and bases dissolved in it.
Non Aqueous Titration
Types of solvents used in non aqueous Titration
Compounds used for non aqueous Titration
Titration done for weak acid and weak base,
Learning objectives
Introduction
Types of solvents
Acidimetry in non aqueous medium
Alkalimetry in non aqueous medium
Estimation of Sodium benzoate and Ephedrine HCl
Applications of non aqueous titrations in pharmacy
Conclusion
Reference
The need for non aqueous titration arises because water can behave as a weak base and a weak acid as well, and can hence compete in proton acceptance or proton donation with other weak acids and bases dissolved in it.
Non Aqueous Titration
Types of solvents used in non aqueous Titration
Compounds used for non aqueous Titration
Titration done for weak acid and weak base,
Non-aqueous titration, Introduction, Theory & Principle, Solvents & Types of solvents, Indicator, Types of Non-aqueous titration, Methods of determination of end point, Assay of Sodium benzoate
Non aqueous titration refers to a type of titration in which the analyte substance is dissolved in a solvent which does not contain water. This procedure is a very important one in pharmacopoeial assays.
Non-aqueous titration, Introduction, Theory & Principle, Solvents & Types of solvents, Indicator, Types of Non-aqueous titration, Methods of determination of end point, Assay of Sodium benzoate
Non aqueous titration refers to a type of titration in which the analyte substance is dissolved in a solvent which does not contain water. This procedure is a very important one in pharmacopoeial assays.
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
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Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
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Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
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ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
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2. Titration in water solutions is limited by factors:
▶It is impossible to titrate for a mix of acids or the bases
▶It is impossible to titrate for a mix of strong and weak
acids (bases)
▶It is impossible to titrate separately for a mix of acids
(bases) with near constants of dissociation
▶It is impossible to define substances which are insoluble
in water.
3. Non-aqueous titrations have the following
advantages
▶ Organic acids and bases that are insoluble in water are soluble in non-
aqueous solvent.
A non-aqueous solvent may help two are more acids in mixture. The
individual acid can give separate end point in different solvent.
Enlargement of solubility range: many substances that are not soluble
in water can be easily titrated in water-free media (e.g. fats and oils)
Enlargement of application range: weak bases and acids can be easily
titrated
Substance compositions that cannot be separately determined in
aqueous media can often be titrated in non-aqueous media
Non-aqueous solvents are useful for the titration of very weak acids or
bases that cannot be titrated in water
Non aqueous titrations are simple and accurate, examples of non
aqueous titration are :
Ephedrine preparations, codeine phosphate in APC, tetracycline,
teramycin, Anti- histamines and various piprazine preparations.
▶
▶
▶
▶
▶
▶
▶
4. Initially, the above three problems were usually avoided in the following
manner:-
1:-Amine salts:-
It is first changed to the water-soluble free base, extracted with an appropriate
organic solvent and treated with an excess volume of standard acid subsequently,
the solvent was evaporated, and the remaining acid determined with a standard
base.
2:- Sodium salts:-
It is first acidified to release the water-insoluble organic acid, extracted with a
suitable organic solvent, the solvent was removed and the residue was
subsequently dried and weighed.
3:-Nitrogen containing compounds:-
They are estimated by micro Kjeldahl's Method. Nevertheless, such specific
quantitative methods gave rise to certain serious anomalies and drawbacks.
5. THEORY:-
According to Bronsted - Lowry theory the various reactions that take place - during
many non-aqueous titrations.
Where, an acid is a proton donor and a base is a proton acceptor. Therefore, when
an acid [HA] undergoes dissociation it gives rise to a proton and the conjugate base
[A] of the acid:-
HA H+ A-
Levelling effect:-
In leveling solvents, several acids are completely dissociates and having
same strength.
Weak acids are normally used in the presence of strongly protophilic
solvents (Strong Base) as their acidic strengths are then enhanced and then
become comparable to these of strong acids; this is known as the levelling
effect.
In other words, strong protophillic solvents convert weak acid to strong acid
is known as Levelling effect.
Generally stong bases are exert as lavelling solvents for strong acid as well
as weak acid. Example:- H₂o is act as levelling solvent for HCl and HBr.
6. Differentiating effect:-
In differentiating solvents, several acids are dissociates to different degrees
and having different strength.
Generally weak bases are exert as differentiating solvents for strong acid as
well as weak acid.
Example:- H₂o is act as differentiating solvent for HF.
7. • Solvent which are used in non aqueous titration are called
non aqueous solvent.
They are following types:-
•
1. Aprotic Solvent
2. Protogenic Solvent
3. Protophillic Solvent
4. Amphiprotic Solvent
8. • Aprotic solvent are most important solvent in this titration. This solvent are
chemically inert and they work as a catalyst. Like this solvent are increase
the rate of speed in reaction and also decrease the rate of speed in reaction
during the chemical process or reaction it will depend on condition.
• Neither acidic nor basic (inert solvent),
The most important examples of aprotic solvent are
• Chloroform
• Benzene
9. ▶Protogenic solvent are acidic in nature. And they
can donate the proton, and they enhance the
strength of weak bases.
Examples of Protogenic solvent are
▶ HCL
▶ H2
so4
10. ▶Protophillic solvent are basic in nature. Which
possess a high affinity for proton.
Examples:-Liquid ammonia, amines and ketone.
11. ▶ Amphiprotic solvent are those solvent they work
as a both mean Protogenic or Protophillic. It
means Amphiprotic solvent are acidic and basic in
nature. And they are accept the proton and donate
the proton.
For examples:- Water, Alcohols and weak organic
acids
12. • Visual indicator are formed to the most suitable for the detection
of end point in non-aqueous titration.
• The important indicator used for non-aqueous titration are
follow:-
1. Crystal voilet:- It is used as 0.5% solution in glacial acetic
acid, it gives voilet colour in basic medium and yellowish
green in acidic medium.
• It is most widely use for the titration of pyridine with
prechloride acid.
2. Oracet Blue B Indicator:- It is prepared o.5% glacial acetic
acid. It gives blue colour in basic medium while pink
colour in acidic medium.
13. Acetic acid used for titration of weak bases,
Nitrogen containing compounds
Acetonitrile / with ACOH: Metal ethanoates
Alcohols (IPA, nBA) : Soaps and salts of organic
acids,
DMF: Benzoic acid, amides etc
14. ▶ Perchloric acid in acetic acid
◦ Amines, amine salts, amino acids, salts of acids
▶Potassium Methoxide in Toluene-Methanol
▶Quan ammonium hydroxide in Acetonitrile-
pyridine
◦ Acids, enols, imides & sulphonamides
15. ▶ Acidimetry in Non-aqueous Titrations—It can
be further sub-divided into two heads, namely :
• Titration of primary, secondary and tertiary amines,
• Titration of halogen acid salts of bases.
• It is used for quantitative estimation of basic drugs.
• Titrant used in acidimetry is acidic in nature like Perchloric acid.
Solvents:- Protogenic solvents are used like Glacial acetic acid.
Indicators:- Crystal violet (End point observed as violet to light green).
Application:-
(i) It may be used for analysis of Ephedrine, Morphine, Adrenaline, Acyclovir
and Caffeine.
(ii) It can be further sub-divided into two heads, namely as:-
(iii) Titration of primary, secondary and tertiary amines like Methlyldopa.
(iv) Titration of halogen acid salts of bases.
16. Alkalimetry in Non-aqueous Titrations— titration of
acidic substances
It is used for quantitative estimation of basic drugs.
Titrant used in acidimetry is acidic in nature like Perchloric
acid.
Solvents:- Protogenic solvents are used like Glacial acetic acid.
Indicators:- Crystal violet (End point observed as violet to light
green).
Application:-
It may be used for analysis of Ephedrine, Morphine,
Adrenaline, Acyclovir and Caffeine.
It can be further sub-divided into two heads, namely as:-
(i) Titration of primary, secondary and tertiary amines like
Methlyldopa.
(ii) Titration of halogen acid salts of bases.
17. Example : Primary amines
METHODOLOGY: four steps
▶(i) Preparation of 0.1 N Perchloric acid,
▶ (ii) Standardization of 0.1 N Perchloric Acid,
▶(iii) Choice of Indicators,
▶(iv) Effect of Temperature on Assays
18. ▶ Materials Required : 8.5 ml of perchloric acid (70.0 to 72.0%)
; 1 Litre of glacial acetic acid ; 30ml of acetic anhydride.
▶ Procedure : Gradually mix 8.5 ml of perchloric acid to 900 ml
of glacial acetic acid with vigorous and continuous stirring. Now
add 30 ml acetic anhydride and make up the volume to 1 litre
with glacialacetic acid and allow to stand for 24 hours before
use.
▶ The acetic anhydride reacts with the water (approx. 30%) in
perchloric acid and some traces in glacialacetic acid thereby
making the resulting mixture practically anhydrous. Thus, we
have :
H2O + (CH3CO)2O →
Acetic anhydride
2CH3COOH
Acetic acid
19. ▶ Weigh accurately about 0.5 g of potassium hydrogen
phthalate in a 100 ml conical flask.
▶ Add 25 ml of glacial acetic acid and attach a reflux
condenser fitted with a silica-gel drying tube. Warm until
the salt gets dissolved completely. Cool and titrate with
0.1 N perchloric acid by making use of either of
the following two indicators :
▶ (a) acetous crystal violet-2 drops, end point Blue to
Blue-Green (0.5% w/v)
▶ (b) acetous oracet blue B-2 drops, end point Blue to
Pink.
20. S.No. Name of Indicator Colorchange Observed
Basic Neutral
Acidic
1
2
3
4
Crystal violet (0.5% w/v
in glacial acetic acid)
Oracet Blue B(0.5% in
glacial acetic acid)
α-Naphtholbenzein
(0.2% in glacial acetic
acid
Quinalidine Red
(0.1% in methanol
Violet
Blue
Blue
Magenta
Bluish
green
Purple
Orange
—
Almost
colourless
Yellowish
green
Pink
Dark-
green
21. (a) Perchloric acid is usually available as a 70 to 72% mixture with
water .It usually undergoes a spontaneous explosive decomposition
and, therefore, it is available always in the form of a solution.
(b) Conversion of acetic anhydride to acetic acid requires 40-45
minutes for its completion. It being an exothermic reaction, the solution
must be allowed to cool to room temperature before adding glacial
acetic acid to volume,
(c) Avoid adding an excess of acetic anhydride especially when
primary and secondary amines are to be assayed, because these may
be converted rapidly to their corresponding acetylated non-basic
products :
R— N H2 + (CH3CO)2
O →R.NH.(CH3CO) + CH3COOH
Primary amine Acetylated product
(d) Perchloric acid is not only a powerful oxidising agent but also a
strong acid. Hence, it must be handled very carefully.
23. Preparation of 0.1 N Potassium Methoxide in Toluene-Methanol
Materials Required: Absolute methanol : 40 ml ; dry toluene : 50 ml ; potassium
metal : 4 g.
Procedure: Add into a dry flask, a mixture of methanol (40 ml) and dry toluene
(50 ml) and cover it loosely. Carefully add freshly cut pieces of potassium
metal to the above mixture gradually with constant shaking. After complete
dissolution of potassium metal, add enough absolute methanol to yield a clear
solution. Toluene 50 ml is added with constant shaking until the mixture turns hazy
in appearance. The process is repeated by the alternate addition of methanol and
benzene until 1 litre of solution is obtained, taking care to add a minimum volume of
methanol to give a visible clear solution.
24. Preparation of 0.1 N Sodiun Methoxide
It is prepared exactly in a similar manner as for 0.1 N Potassium Methoxide, using 2.3 g of freshly-cut sodium in
place of potassium.
Preparation of 0.1 N Lithium Methoxide
It is prepared as for 0.1 N Potassium Methoxide, but using 0.7 g of lithium in place of potassium.
Standardization of 0.1 N Methoxide Solution
Materials Required: Dimethylformamide (DMF) : 10 ml ; Thymol blue (0.3% in MeOH) ; 0.1 N lithium
methoxide in toluene methanol ; benzoic acid : 0.6 g.
Procedure : Transfer 10 ml of DMF in a conical flask and add to it 3 to 4 drops of thymol blue and first
neutralize the acidic impurities present in DMF by titrating with 0.1 N lithium Methoxide in toluene-methanol.
Quickly introduce 0.06 g of benzoic acid and titrate immediately with Methoxide in toluene methanol.
Caution: Care must be taken to avoid contamination of neutralized liquid with atmospheric carbon
dioxide.
Na + CH3OH → CH3ONa + H ↑
Interaction between sodium metal and methanol is an exothermic reaction and hence, special care must be taken
while adding the metal into the dry solvent in small lots at intervals with adequate cooling so as to keep the
reaction well under control.
H2O + CH3 ONa → CH3OH + NaoH
H2CO3 + 2CH3ONa → 2CH3OH + Na2CO3