General Information
    • ISSN: 2010-0221
    • Frequency: Bimonthly
    • DOI: 10.18178/IJCEA
    • Editor-in-Chief: Dr. Eldin W. C. Lim
    • Executive Editor: Mr. Ron C. Wu
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Editor-in-chief
Dr. Eldin W. C. Lim
Dept. of Chemical and Biomolecular Engineering,
National University of Singapore, Singapore
IJCEA 2016 Vol.7(4): 254-258 ISSN: 2010-0221
doi: 10.18178/ijcea.2016.7.4.584

Monitoring the Effect of Different Storage Conditions of Cold-Pressed Rice Bran Oil

Chutima Ponchurdchai and Jirada Singkhonrat
Abstract—This study investigated the effect of different storage conditions of cold-pressed rice bran oil from 2 different regions in Thailand (Lopburi province, LRBO and Yasothorn province, YRBO). All samples were stored at different temperature as opened and sealed bottle for 12 months. Fatty acid composition by nuclear magnetic resonance, NMR spectroscopy, chemical properties such as acid value, iodine value and peroxide value were reported. Also, the antioxidant content and its activity were evaluated, including FRAP assay (Ferric reducing antioxidant potential) and DPPH radical scavenging assay (1, 1-diphenyl-2-picrylhydrazyl radical reducing power methods). Cold-pressed rice bran oils sealed bottles for 12 months and freshly opened bottles have shown no affect to acid value, iodine value and peroxide value (p<0.05). Fatty acid composition of oil by 1H NMR technique obtained a good agreement with gas chromatography technique and observed mol% of unsaturated fatty acid was slightly decreased after year storage. After 12-month storage below 5°C temperature, LRBO and YRBO showed good radical scavenging activities compared to quercetin with DPPH IC50 of 0.647±0.02 and 0.663±0.02 mg/mL and with FRAP assay of 0.42106± 0.002 and 0.37471± 0.002 g quercetin equivalents/g, respectively.

Index Terms—Rice bran oils, fatty acid, stability, 1H NMR.

J. Singkhonrat and C. Ponchurdchai are with the Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathumthani 12120 Thailand (e-mail: jirada@tu.ac.th, chutimapcc@gmail.com).

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Cite: Chutima Ponchurdchai and Jirada Singkhonrat, "Monitoring the Effect of Different Storage Conditions of Cold-Pressed Rice Bran Oil," International Journal of Chemical Engineering and Applications vol. 7, no. 4, pp. 254-258, 2016.

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