偏最小二乘速差动力学分光光度法同时测定酪氨酸和色氨酸  

Simultaneous Kinetic Spectrophotometric Determination of Tyrosine and Tryptophane with Aid of Chemometrics

作　　者：倪永年[1] 蔡英俊[1] 

机构地区：[1]南昌大学化学系

出　　处：《食品科学》2008年第3期433-435,共3页Food Science

基　　金：国家自然科学基金项目(20562009);江西省自然科学基金项目(0620041);教育部长江学者和创新团队发展计划项目(IRT0540);中科院电分析化学和湖南大学化学传感与计量学国家重点实验室基金项目(SKLEAC2004-3;CBC2005-22)

摘　　要：本实验采用速差动力学分光光度法对酪氨酸和色氨酸的混合物进行不经分离的同时测定。在碱性介质下,KMnO4可以氧化酪氨酸和色氨酸,同时KMnO4被还原为浅绿色的MnO42-,测定反应过程中MnO42-的吸光度可推知其浓度的变化情况。测定所得的数据采用化学计量学-偏最小二乘方法解析,从而可对酪氨酸和色氨酸分别进行测定。A kinetic speetrophotometric method for simultaneous determination of tyrosine and tryptophane witfi chemometrics was developed. This method was based on the reduction of KMnO4 to MnO42 by these two amino acids in alkalescent medium. By detecting the absorbance of MnO42 at 610 nm wavelength for a period of 300 s, the kinetic .data were measured and recorded for determination. The partial least square method was used to establish the model based on the kinetic data and was then used to predict the merchant amino acid samples with satisfy results.

关 键 词：速差动力学分光光度法 化学计量 酪氨酸 色氨酸 

分 类 号：TS207.3[轻工技术与工程—食品科学]