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Titration is a quantitative analytical method for estimating the concentration of a known analyte by allowing it to react with a titrant over time until an endpoint is reached.
Non-aqueous titrations are analytical procedures that use organic liquids as the sample’s solvent to determine the amount of the desired ingredient contained in a selection. As a result, this type of titration is critical when estimating the amount of an insoluble water analyte in a sample. Acid-base titrations, redox titrations, iodometry, and iodimetry are all examples of non-aqueous titrations.
The chemical reaction in non-aqueous acid-base titrations occurs in organic solvents, such as glacial acetic acid. The chemical reaction happens in non-aqueous titration redox reactions when water-insoluble oxidising and reducing chemicals are used.
Titration is an important procedure since it has a significant impact on the quality of all drugs. It’s used to determine or detect the amount of water in a pharmaceutical product. The binding constants between metal cations and small molecule medicines have also been measured using titration. Lab technicians frequently employ titration when working with blood and urine samples.
What role does non-aqueous titration play in the pharmaceutical industry?
Non-aqueous titrations have grown in relevance in pharmaceutical analysis and are recognised as an official analytical method by most modern pharmacopoeias. The main purpose behind this was to create a simple, quick, and cost-effective titrimetric test for measuring LAN in pharmaceutical capsules. The proposed approach took advantage of the drug’s basic properties, and the drug solution in 1,4-dioxane was titrated directly using perchloric acid in a 1,4-dioxane medium with methyl red as an indicator. The proposed method proved simple, speedy, cost-effective, and easy to use in quality control laboratories in underdeveloped nations where advanced and expensive instruments are unavailable.
What are the applications of non-aqueous titrations?
Non-aqueous titration is preferred for biological concerns. It is critical in pharmacopoeial assays. It has a wide range of applications, particularly beneficial in the medical field.
The following are a few examples of non-aqueous titration uses where these titrations are used to determine:
- Assays
- Analyte concentration
- Hydrophobic medicines, such as steroids, phenobarbitone, tetracyclines, and diuretics
- Composition of adrenergic and antitubercular drugs
- Hydrophobic substances, phenobarbitone, diuretics, and steroids
- Composition of antitubercular medicine and adrenergic medication
The use of non-aqueous titrations in pharmaceutical analysis
For non-aqueous titrations, many inorganic solvents have been utilised, but a few are used more frequently than others. The following are some of the often-used solvent systems. A pure, dry analytical reagent quality solvent is always utilised to aid in acquiring sharp endpoints.
- Glacial Ethanoic Acid: The most common non-aqueous solvent is glacial ethanoic acid.
- Acetonitrile (methyl cyanide, cyanomethane): Acetonitrile (methyl cyanide, cyanomethane) is frequently mixed with other solvents, including chloroform and phenol, as well as ethanoic acid. When metal ethanoates are titrated with perchloric acid, it allows for very sharp endpoints.
- Alcohol: Salts of organic acids, particularly soaps, are best determined in glycol-alcohol combinations or glycol-hydrocarbon mixtures. The most prevalent combinations are ethylene glycol (dihydroxyethane) and propan-2-ol or butan-1-ol. Both the polar and non-polar ends of the molecules find excellent solvents in these combinations.
- Dioxane: Another common solvent is dioxane, frequently substituted for glacial ethanoic acid for quantifying combinations of chemicals. Dioxane, unlike ethanoic acid, is not a levelling solvent. Therefore, discrete endpoints corresponding to different components in combinations are usually attainable.
Advantages of Non-Aqueous Solvents
- Simple, straightforward qualitative titration method
- Provide precise outcomes with clearly defined endpoints
- Titrations using weak acids and bases are made easier
- Assistance in determining concentration expressions
- Offers high selectivity and is widely used in pharmaceutical goods, such as antitubercular and adrenergic drug assays.
Conclusion
There’s no denying the fact that non-aqueous titration in the pharmaceutical industry has helped a lot of companies in eliminating toxins from their medicines. Non-aqueous titrations are the most common titrimetric approach used in pharmacopoeial assays, and they serve a dual purpose: they may be used to titrate weak acids and bases while also providing a solvent in which organic molecules can be dissolved. A method for determining loratadine (LOR) in pure and pharmaceutical dosage forms was devised that is simple, cost-effective, quick, and precise.
