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Estimation of acetylcysteine and its preparations
American Journal of Hospital Pharmacy
|March 1, 1977
Summary
A new spectrophotometric method accurately determines acetylcysteine in pharmaceuticals using Ellman's reagent. This simple, rapid assay measures the absorbance of a reaction byproduct, suitable for quantifying small amounts.
Area of Science:
- Analytical Chemistry
- Pharmaceutical Analysis
Background:
- Accurate quantification of acetylcysteine is crucial for pharmaceutical quality control.
- Existing methods may lack sensitivity or reproducibility for certain applications.
Purpose of the Study:
- To develop and validate a sensitive and reproducible spectrophotometric method for acetylcysteine determination.
- To establish optimal reaction conditions and assess the method's linearity.
Main Methods:
- Utilized Ellman's reagent (5,5'-dithiobis-(2-nitrobenzoic acid)) for reaction with acetylcysteine.
- Measured absorbance at 412 nm, corresponding to the liberated 2-nitro-5-thiolbenzoic acid anion.
- Investigated reaction kinetics, optimal conditions, and concentration-absorbance linearity.
Main Results:
- The spectrophotometric procedure demonstrated high sensitivity and reproducibility.
- Optimal reaction conditions and linearity were established for accurate quantification.
- The method effectively quantifies small quantities of acetylcysteine.
Conclusions:
- The proposed spectrophotometric method is simple, rapid, and accurate.
- It is suitable for the determination of acetylcysteine in pharmaceutical dosage forms.
- This assay provides a reliable tool for quality control and analysis.