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[Photodecomposition of artificial calculus bovis]
1School of Pharmacy, West China University of Medical Sciences, Chengdu.
Yao Xue Xue Bao = Acta Pharmaceutica Sinica
|January 1, 1990
Summary
Artificial calculus bovis (ACB) degrades via a two-step reaction under light. UV light causes the fastest photodecomposition, with predictable fading times based on light intensity.
Area of Science:
- Analytical Chemistry
- Photochemistry
Context:
- Artificial calculus bovis (ACB) is a common substitute for Calculus bovis in Traditional Chinese Patent Medicine.
- Understanding the stability of ACB is crucial for its effective use and storage.
Purpose:
- To investigate the photodecomposition kinetics of ACB under different light sources.
- To determine the reaction order and rate constants for ACB photodegradation.
Summary:
- Photodecomposition of ACB follows a two-step apparent first-order reaction under UV, fluorescent, and iodine-tungsten lamps.
- The photodecomposition rate is fastest under UV light, followed by fluorescent and then iodine-tungsten light.
- Kinetic equations were derived to predict fading times, indicating ACB would degrade in 1.6 days if exposed to bright room light.
Impact:
- Provides quantitative data on ACB's light sensitivity.
- Enables prediction of ACB degradation under various lighting conditions.
- Informs optimal storage and handling practices for ACB to maintain its efficacy.