Simultaneous determination of methylxanthines in coffees and teas by UV-Vis spectrophotometry and partial least squares

被引：70

作者：

López-Martínez, L ^{[1
]}

López-de-Alba, PL ^{[1
]}

García-Campos, R ^{[1
]}

De León-Rodríguez, LM ^{[1
]}

机构：

[1] Univ Guanajuato, Inst Invest Cientificas, Guanajuato 36000, Mexico

来源：

ANALYTICA CHIMICA ACTA | 2003年 / 493卷 / 01期

关键词：

PLS; methylxanthines; standard addition; coffees; teas;

D O I：

10.1016/S0003-2670(03)00862-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

This work describes a method to simultaneously determine caffeine (CF) and theobromine (TB) in coffee and tea samples using partial least squares (PLS-1). Sample preparation was required to eliminate strong interfering components. High-performance liquid chromatography (HPLC)-found concentrations of caffeine and theobromine (theophylline was not found in any analyzed sample) were used to construct universal calibration matrixes for coffee and tea. Due to the low levels of theobromine when compared to caffeine (up to 1000:1), theobromine addition standard was required to dramatically improve method performance. The method developed did not show statistically significant differences with an HPLC standard technique. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：83 / 94

页数：12

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