Methods: Tretinoin in the dropping pills was determined spectrophotometrically and rotating basket method was adopted to determine its dissolution rate.
方法：采用紫外分光光度法测定滴丸中维甲酸的含量，转篮法考察其体外溶出度。
2
The efficiencies of decolorization and degradation were demonstrated by the changes of absorbance at maximum wavelength in culture liquid spectrophotometrically.
方法采用分光光度法测定培养液最大吸收波长处吸光度的改变，确定染料的脱色率及降解率。
3
Methods:The polysaccharide content in ganoderma capsules was determined spectrophotometrically and its stability was evaluated at constant temperature by using accelerated method.