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With sulphur-fumigated Chinese medicinal materials( Fritillaria thunbergii,Isatis indigotica,Asparagus cochinchinensis and Poria cocos) as the test materials,sulfur dioxide or sulfite residue was determined by the method in Chinese Pharmacopoeia(2015 edition) and titration-fluorescence spectrometry,respectively. The results showed that there were significant differences in measured value between titration-fluorescence spectrometry and pharmacopoeia method. The measurement result of titration-fluorescence spectrometry was much closer to the actual content of sulfur dioxide in Chinese medicinal materials. Thus,titration-fluorescence spectrometry had higher application value.
With sulfur-fumigated Chinese medicinal materials (Fritillaria thunbergii, Isatis indigotica, Asparagus cochinchinensis and Poria cocos) as the test materials, sulfur dioxide or sulfite residue was determined by the method in Chinese Pharmacopoeia (2015 edition) and titration-fluorescence spectrometry, respectively. The results showed that there were significant differences in measured value between titration-fluorescence spectrometry and pharmacopoeia method. Thus, measurement of titration-fluorescence spectrometry was much closer to the actual content of sulfur dioxide in Chinese medicinal materials. Thus, titration-fluorescence spectrometry had higher application value.