Detection of exogenous citric acid in fruit juices by stable isotope ratio analysis

被引：33

作者：

Jamin, E ^{[1
]}

Martin, F ^{[1
]}

Santamaria-Fernandez, R ^{[1
]}

Lees, M ^{[1
]}

机构：

[1] EUROFINS, F-44323 Nantes, France

来源：

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2005年 / 53卷 / 13期

关键词：

citric acid; fruit juice; authentication; carbon; 13; deuterium;

D O I：

10.1021/jf050400b

中图分类号：

S [农业科学];

学科分类号：

09 [农学];

摘要：

A new method has been developed for measuring the D/H ratio of the nonexchangeable sites of citric acid by isotope ratio mass spectrometry (IRMS). Pure citric acid is transformed into its calcium salt and subsequently analyzed by pyrolysis-IRMS. The citric acid isolated from authentic fruit juices (citrus, pineapple, and red fruits) systematically shows higher D/H values than its nonfruit counterpart produced by fermentation of various sugar sources. The discrimination obtained with this simplified method is similar to that obtained previously by applying site specific isotopic fractionation-nuclear magnetic resonance (SNIF-NMR) to an ester derivative of citric acid. The combination of carbon 13 and deuterium measurements of extracted citric acid is proposed as a routine method for an optimum detection of exogenous citric acid in all kinds of fruit juices.

引用

页码：5130 / 5133

页数：4

共 10 条

[1]

CARBON ISOTOPE RATIOS IN NATURAL AND SYNTHETIC CITRIC-ACID AS INDICATORS OF LEMON JUICE ADULTERATION [J].