Analysis of Non-volatile Organic Acids in Fermented and Dried Cocoa Beans by High Performance Liquid Chromatography

Selamat, Jinap and Dimick, P. S. (1990) Analysis of Non-volatile Organic Acids in Fermented and Dried Cocoa Beans by High Performance Liquid Chromatography. Pertanika, 13 (1). pp. 107-111.

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A high peiformance liquid chromatographic methodfor analysis of non-volatile acids (oxalic, citric, tartaric, succinic, malic and lactic) in fermented and dried cocoa beans is described. Bean samples were pulverized in dionized water using a Polytron Homogenizer (Brinkman)for 20 sec and centrifuged at 14000 rpm for 45 min at 25°C. The extract was alkalized to pH between 8-9 and passed through intermediate base anion exchange resin; the acidic fraction was eluted after adding 10lt/o sulphuric acid to the column. Polyphenols in the fraction were then eliminated by passing the acidic fraction through a reverse phase SEP-PAK that had been pre-wet with methanol. The eluate was analyzedfor non-volatile acids using Organic Acid Column (Bio-Rad) with O.lN H SO as a mobile phase at 65°C. The acids were detected at 214nm and quantified by comparing peak 2hezght of sample to those of standards. The method demonstrated excellent reproducibility and recoveries of the added acids.

Item Type:Article
Keyword:Cocoa beans, non-volatile acids, HPLC
ID Code:2780
Deposited By: Nur Izyan Mohd Zaki
Deposited On:17 Nov 2009 06:47
Last Modified:27 May 2013 07:03

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