Your browser doesn't support javascript.
[Photodecomposition of artificial calculus bovis].
Yao Xue Xue Bao ; 25(10): 769-76, 1990.
Artigo em Chinês | MEDLINE | ID: mdl-2099592
Artificial calculus bovis (ACB) is widely used in dispensing Chinese Traditional Patent Medicine as a substitute for Calculus bovis. Photodecomposition rule of ACB sample irradiated with three different light sources was studied by diffuse reflectance spectrophotometry (DRS) in this paper. The results show that, the photodecomposition rate curves of the ACB sample irradiated by all three light sources are composed of two straight lines of different slopes, indicating that they are of two-step apparent first order reaction, the apparent photodecomposition constants in the first steps are about twice as high as those in the second steps. The ACB sample has the fastest photodecomposition rate when irradiated with the UV mercury-arc lamp and the second with the fluorescent mercury-arc lamp and slowest with the iodine-tungsten lamp. In these three light sources apparent photodecomposition constants of ACB sample are respectively K1, 2.7629 x 10(-5), 4.4132 x 10(-6); k2, 1.2176 x 10(-5), 2.0684 x 10(-6), 1.4357 x 10(-6) (lx-1.h-1). The apparent constants are independent of the product of the radiation intensity and the irradiation time, but the irradiation time is in inverse ratio of the radiation intensity to get the same proportion of the sample photodecomposition. The fading time of the ACB sample under different radiation intensity can be predicted with the kinetic equations reported. The fading time of ACB sample if directly exposed to light in bright room is 1.6 days.(ABSTRACT TRUNCATED AT 250 WORDS)





Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Bilirrubina / Materia Medica Aspecto clínico: Predição / Prognóstico Idioma: Chinês Revista: Yao Xue Xue Bao Ano de publicação: 1990 Tipo de documento: Artigo