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Determination of free fatty acids in crude palm oil and refined-bleached-deodorized palm olein using Fourier transform infrared spectroscopy


Citation

Che Man, Y. B. and Moh, M. H. and Van De Voort, F. R. (1999) Determination of free fatty acids in crude palm oil and refined-bleached-deodorized palm olein using Fourier transform infrared spectroscopy. Journal of the American Oil Chemists' Society, 76 (4). pp. 485-490. ISSN 0003-021X; ESSN: 1558-9331

Abstract / Synopsis

A rapid direct Fourier transform infrared (FTIR) spectroscopic method using a 100 µ BaF2 transmission cell was developed for the determination of free fatty acid (FFA) in crude palm oil (CPO) and refined-bleached-deodorized (RBD) palm olein, covering an analytical range of 3.0–6.5% and 0.07–0.6% FFA, respectively. The samples were prepared by hydrolyzing oil with enzyme in an incubator. The optimal calibration models were constructed based on partial least squares (PLS) analysis using the FTIR carboxyl region (C=O) from 1722 to 1690 cm−1. The resulting PLS calibrations were linear over the range tested. The standard errors of calibration (SEC) obtained were 0.08% FFA for CPO with correlation coefficient (R2) of 0.992 and 0.01% FFA for RBD palm olein with R2 of 0.994. The standard errors of performance (SEP) were 0.04% FFA for CPO with R2 of 0.998 and 0.006% FFA for RBD palm olein with R2 of 0.998, respectively. In terms of reproducibility (r) and accuracy (a), both FTIR and chemical methods showed comparable results. Because of its simpler and more rapid analysis, which is less than 2 min per sample, as well as the minimum use of solvents and labor, FTIR has an advantage over the wet chemical method.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Food Science and Biotechnology
DOI Number: https://doi.org/10.1007/s11746-999-0029-z
Publisher: AOCS Press
Keywords: FTIR; Free fatty acids; Palm oil; Palm olein; Partial least squares analysis; Spectroscopy
Depositing User: Nabilah Mustapa
Date Deposited: 07 Sep 2017 12:31
Last Modified: 07 Sep 2017 12:31
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1007/s11746-999-0029-z
URI: http://psasir.upm.edu.my/id/eprint/57081
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