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采用荧光分光光度法测定了增效黄连素胶囊中甲氧苄胺嘧啶的含量。样品溶解后,加入碱性高锰酸钾溶液氧化,用抗坏血酸破坏剩余的高锰酸钾,氯仿提取,分取氯仿提取液在λ_(EX)280nm、λ_(EM)345nm波长处进行测定。样品共存的黄连素及淀粉等辅料不干扰测定。
The content of trimethoprim in synergistic berberine capsules was determined by fluorescence spectrophotometry. After the sample was dissolved, alkaline potassium permanganate solution was added to oxidize, and the remaining potassium permanganate was destroyed with ascorbic acid and extracted with chloroform. The chloroform extract was fractionated and measured at wavelengths of λ_(EX) 280 nm and λ_(EM) 345 nm. Coexistence of samples of berberine and starch and other excipients do not interfere with the assay.