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Gratacos-Cubarsi M.,Food Chemistry Unit | Ribas-Agusti A.,Food Chemistry Unit | Garcia-Regueiro J.A.,Food Chemistry Unit | Castellari M.,Food Chemistry Unit
Food Chemistry | Year: 2010

A method for the simultaneous determination of intact glucosinolates and main phenolic compounds (flavonoids and sinapic acid derivatives) in Brassica oleracea L. var. botrytis was proposed. A simplified sample extraction procedure and a UPLC separation were carried out to reduce the total time of analysis. B. oleracea samples were added with internal standards (glucotropaeolin and rutin), and extracted with boiling methanol. Crude extracts were evaporated under nitrogen, redissolved in mobile phase and analysed by UPLC with double detection (ESI--MRM for glucosinolates and flavonoids, and DAD for main sinapic acid derivatives). The proposed method allowed a satisfactory quantification of main native sinapic acid derivatives, flavonoids and glucosinolates with a reduced time of analysis. © 2009 Elsevier Ltd. All rights reserved. Source

Yousef A.A.,Food Chemistry Unit | Abbas A.B.,Food Chemistry Unit | Badawi B.S.,Food Chemistry Unit | Al-Jowhar W.Y.,Food Chemistry Unit | And 2 more authors.
Food Additives and Contaminants - Part A Chemistry, Analysis, Control, Exposure and Risk Assessment | Year: 2012

A simple, quantitative and rapid method for total brominated vegetable oil (BVO) using ion chromatography (IC) with suppressed conductivity detection was developed and successfully applied to soft drinks with results expressed as inorganic bromide anion. The procedure involves extraction of BVO with diethyl ether and treatment with zinc dust in a solution of acetic acid, giving recoveries ranging between 92.5 and 98.5%. The calibration curves obtained were linear with correlation coefficients (r2) of 0.998, a coefficient of variation (CV) of less than 5% and limit of detection (LOD) and limit of quantification (LOQ) of 250 and 750 μg l-1, respectively. The method was successfully applied to the determination of BVO in several commercial soft drinks which were found to contain BVO in the range 1.8-14.510 mg l-1. The method has less sources of error compared to previously published methods. © 2012 Copyright Taylor and Francis Group, LLC. Source

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