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NATURAL JUICES AUTHENTIFICATION BY GC-MS

MONICA CULEA1, ANDREEA-MARIA IORDACHE2, ONUC COZAR1

1University Babes-Bolyai, 1 Kogalniceanu, 400084 Cluj-Napoca, Romania
e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
2National R&D Institute of Cryogenics and Isotopic Technologies – ICSI Rm. Valcea,
Research & Development Department – ICSI Rm. Valcea, Str. Uzinei, nr. 4 OP 4, CP 10,
Rm. Valcea, cod 240050, Romania, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


ABSTRACT

A simple and rapid GC-MS method for the detection of adulteration of natural fruit juices is presented. The method consists of the analysis of sterol patterns and it is a useful rapid approach for the fruit juices control by GC-MS .
A GC-MS analytical method is described for some natural juices analysis. The fingerprint of sterols was used to characterize the natural juice. The fruit juice was extract by using hexane (or petrol ether) as a solvent. The fruit juice extracts are separated on a Rtx-5MS capillary column, 15 m x 0.25 mm, 0.25µm film thickness, using a 24 min temperature program from 500C (1min), 100C/min to 3000 in the SCAN mode. The following conditions were followed: transfer line temperature: 2500C; injector temperature: 2500C; ion source temperature 2500C; Splitter: 10:1. Electron energy was 70eV and emission current 100µA.  
Keywords: adulteration, sterols, GC-MS