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

S. JINAP and P.S. DIMICK

Pertanika Journal of Tropical Agricultural Science, Volume 13, Issue 1, April 1990

Keywords: Cocoa beans, non-volatile acids, HPLC.

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A high performance liquid chromatographic method for 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 rpmfor 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 lO°7o 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 methanoi. The eluate was analyzed for non-volatile acids using Organic Acid Column (Bio-Rad) with 0. IN H SO as a mobile phase at 65°C The acids were detected at 214nm and quantifiedby comparing peak height of sample to those of standards. The method demonstrated excellent reproducibility and recoveries of the added acid

ISSN 1511-3701

e-ISSN 2231-8542

Article ID

PERT-0597-1990

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