近红外光谱法测定茶多酚中总儿茶素含量  

Feasibility study on quantitative analysis of total catechins in tea polyphenol powder by near-infrared spectroscopy

作　　者：陈华才[1] 吕进[2] 俸春红[3] 芦永军[4] 陈星旦[4] 

机构地区：[1]中国计量学院生命科学学院,浙江杭州310018 [2]中国计量学院计量技术工程学院 [3]中国农业科学院茶叶研究所,浙江杭州310008 [4]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033

出　　处：《中国计量学院学报》2005年第1期17-20,共4页Journal of China Jiliang University

基　　金：浙江省自然科学基金资助项目(No.202081);中国科学院长春光学机密机械与物理研究所应用光学国家重点实验室开放基金资助项目

摘　　要：　以高效液相色谱(HPLC)分析结果为参考值,建立了快速测量茶多酚中总儿茶素含量的近红外光谱定标模型.将48份茶多酚样品组成定标样品集,在1000～2500nm(4000～10000cm-1)的近红外漫反射光谱为定标波长范围内,光谱经一阶导数(Firstderivative)、二阶导数(Secondderivative)、标准归一化(Stan-dardnormalvariate,SNV)和多元散射校正(multiplicativesignalcorrection,MSC)处理后结合偏最小二乘回归(PLS)定标.经内部交叉验证表明,光谱经SNV处理后建模结果最佳.模型的相关系数Corr.Coeff=0.997,校正均方根RMSEC=1.71%.比较了经典最小二乘法(CLS)、偏最小二乘法(PLS)和主成分回归(PCR)等方法建模结果,以偏最小二乘回归建模效果最好.This paper indicates the possibility to use near infrared spectroscopy (NIRS) combined with PLS as a rapid method to determine the content of total catechins in tea polyphenol (TP) powder. Reference values of total catechins of 48 TP powder samples were analyzed by HPLC. PLS calibration models were built with diffuse reflectance spectra in 1 000~2 500 nm region after pre-processed with first derivative, second derivative, standard normal variate (SNV), and multiplicative signal correction (MSC) respectively. Results indicated that the calibration model built with PLS after spectra pre-processed with SNV was the best. The correlation coefficient and RMSEC of this model were 0.997 and 1.71 % respectively. The comparison of the calibration models built with CLS, PLS and PCR indicated that the PLS was the optimal method.

关 键 词：茶多酚 近红外光谱法 儿茶素 高效液相色谱(HPLC) 含量 近红外漫反射光谱 偏最小二乘回归 经典最小二乘法 测定 normal signal 偏最小二乘法 主成分回归 分析结果 定标模型 快速测量 波长范围 一阶导数 二阶导数 散射校正 

分 类 号：O657.33[理学—分析化学] TS202.3[理学—化学]