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New spectrophotometric assay for pilocarpine
Journal - Association of Official Analytical Chemists
|July 1, 1980
Summary
A new, rapid method accurately determines pilocarpine in eye drops, even with decomposition products. This technique offers superior sensitivity for pilocarpine stability testing compared to existing methods.
Area of Science:
- Analytical Chemistry
- Pharmaceutical Analysis
Background:
- Pilocarpine is a crucial medication for treating glaucoma.
- Accurate quantification of pilocarpine in eye drops is essential for therapeutic efficacy and patient safety.
- Existing methods may struggle to differentiate pilocarpine from its decomposition products.
Purpose of the Study:
- To develop and validate a rapid and accurate method for determining pilocarpine in ophthalmic solutions.
- To assess the method's ability to detect pilocarpine in the presence of degradation products.
- To evaluate the stability of pilocarpine nitrate solutions under specific conditions.
Main Methods:
- Complexation of pilocarpine with bromocresol purple at pH 6.
- Measurement of liberated dye at 580 nm after treatment with 0.1N NaOH.
- Application of the method to pilocarpine eye drop samples and stability studies.
Main Results:
- The method demonstrated a relative standard deviation of 1.99%.
- Successfully analyzed two batches of pilocarpine eye drops.
- Revealed 87.5% decomposition in a pilocarpine nitrate solution incubated at 65°C, which the BPC method failed to detect.
Conclusions:
- The developed method provides a quick and reliable way to quantify pilocarpine in eye drops.
- This technique is highly effective in detecting pilocarpine degradation, outperforming the BPC method.
- The method is suitable for routine quality control and stability monitoring of pilocarpine formulations.