近红外漫反射光谱法鉴别贝母药材的研究

目的:建立贝母药材及其伪品鉴别的近红外漫反射光谱分析法.方法:将炉贝、松贝、青贝、浙贝、伊贝母、平贝母、湖北贝母及贝母伪品东贝母、光慈菇、山慈菇等10种药材烘干、粉碎、过筛,直接测定其近红外漫反射光谱;分别采用聚类分析、褶合变换-可视化-相似系数分析等方法对10种药材进行鉴别.结果:10种药材的近红外漫反射光谱原谱极其相似,无法鉴别;聚类分析可将3种贝母伪品与7种贝母正品区分开,但不同贝母正品之间的鉴别效果不甚理想;褶合变换-可视化-相似系数分析将贝母正品之间的微小差异进一步扩大化、量化,正品之间的鉴别效果得到改善.结论:近红外漫反射光谱分析法可直接、无损测定固体样品,结合信息处理技术,可以为贝母及其他中药鉴别分析提供一种新的方法.

Identification of Fritillaria by near-infrared diffuse reflectance spectroscopy

AIM: To establish an identification method of Fritillaria based on near-infrared diffuse reflectance spectroscopy(NIRDRS). METHODS: Seven certified Fritillaria,i.e.,F.przewalskii Matim,F.cirrhosa D.Don,F.unibraacteate Hsiaaoet.K.C.Hsia,F.thunbergii Mig,F.pallidiflora,F.ussuriensis Matin and F.kupehensis Hsiaet K.C.Hsia,and three fake "Fritillaria",i.e.,F.thunbergii Varchekiugensis Hsiaet K.C.Hsia,Tulipa edulis and Iphigeniaindica were dried,grinded and sieved before their NIRDRS spectra were detected.Cluster analysis,convolution transform-visualization-similarity analysis were further employed to(identify) the NIRDRS of the ten herbal medicines. RESULTS: The zero-order NIRDRS spectra of the ten herbal medicines were too similar to be identified respectively.The cluster analysis helped differentiate the three fake "Fritillaria" from seven certified Fritillaria,but the identification between the certified Fritillaria remained dissatisfactory.The convolution transform-visualization-similarity analysis magnified and then quantified the minute differences between the certified Fritillaria,which significantly improved their identification. CONCLUSION: NIRDRS is a direct,non-destructive analytical method of solid samples.Coupled with information treatment techniques,DIRDRS provides a new identification method of crude traditional Chinese medicines.