Abstract
Rice bran oil was subjected to static heating at 180 + 2°C in a domestic fryer for 8 h in this process 150 ml of the heated oil samples were drawn, at intervals of every 2 h, to study the changes in the physico-chemical characteristics. Results indicated that the peroxide value and free fatty acid content increased gradually from 0.2 to 2.9 Meq.O2/kg of oil and 0.25 to 0.63% respectively. The oil became darker as given by the colour value (5R + Y) 63 Lovibond units. Tocopherol content was found to decrease from 48 mg/100gram to 5 mg/100gram at the end of 8 h of heating whereas, oryzanol was fairly stable (1.59 to 1.40%). The p-anisidine value and Total polar compound (TPC) increased from 5.04 to 18.30 and 1.0 to1.8% respectively, showing the formation of secondary oxidation products. Rice bran oil is a non-Newtonian fluids having shear thinning behavior. Heating was found to cause an increase in the flow behavior index. Fatty acid composition did not show significant changes except for the linoleic acid content which decreased from 29.4 to 27.1%.
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References
AOCS (2002–2003). Official methods and recommended practices of the AOCS, 5th edn, Champaign IL: AOCS press, methods, Ca 5a-40, Cd 8–53,Ce 2–66, Cd 18–90 and Cd 11C-93
Chakrabarthy MM (1989) Rice Bran: a new source for edible use as industrial oil. In: Erickson DR (ed) Proceeding of conference on edible fats and oils processing. AOCS, Champaign, pp 331–340
Chen JF, Tai CY, Chen YC, Chen BH (2001) Effects of conjugated linoleic acid on the oxidation stability of model lipids during heating and illumination. Food Chem 72:199–206
Duncan DB (1995) Multiple range tests and multiple F test. Biometrics 11:1–42
Farhoosh R, Kenari RE (2009) Anti rancidity effects of sesame and rice bran oil on canola oil during deep frying. J Am Oil Chem Soc 86:539–544
Gertz C, Klostermann, Kochar SP (2000) Testing and comparing oxidative stability of vegetable oils and fats at frying temperature. Eur J Lipid Sci Technol 102:543–551
Ghosh M (2007) Review on recent trends in rice bran oil processing. J Am Oil Chem Soc 84:315–324
Gopalkrishna AG (2002) Nutritional component of rice bran oil in relation to processing. Lipid Technol 14:80–84
Kochar SP (2000) Stabilization of frying oils with natural antioxidant compounds. Eur J Lipid Sci Technol 102:552–559
Kohn A, Mitchell B (2006) Analysis of trans fatty acids. Lipid Technol 18(12):279–282
Mishra R, Sharma HK, Sarkar BC, Singh C (2011) Thermal oxidation of rice bran oil during oven test and microwave heating. J. Food Sci Technol doi:10.1007/s13197-011-0274-7
Paquot C, Havtfenne A (eds) (1987) IUPAC method no. 2.301. Standard methods for analysis of oils, fats and derivatives. International Union of Pure and Applied chemistry, 7th edn. Blackwell, Oxford, pp 174–182
Seetharamaiah GS, Prabakar JV (1986) Oryzanol content of Indian rice bran oil and its extraction from soapstock. J Food Sci Technol 23:270–27
Valantina R, Sahayaraj PA, Prema AA (2010) Antioxidant stability in palm and rice bran oil using simple parameters. Rasayan J Chem 3(1):44–50
Wan TW, Bahruddin S, Boey PL (2009) Determination of TOTOX value in palm oleins using a FI-potentiometric analyzer. Food Chem 113(1):285–290
Yoon SH, Kim SK, Kim KH, Kwon TW, Teah YK (1987) Evaluation of physicochemical changes in cooking oil during heating. J Am Oil Chem Soc 64:870–873
Acknowledgments
The authors express their thanks to Dr. V. Prakash, Director, CFTRI, Mysore, India for providing infrastructure facilities to carry out the work, and Dr. B.R. Lokesh, Head, Department of Lipid Science and Traditional Foods CFTRI, Mysore, India for his constant help and encouragement.
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Latha, R.B., Nasirullah, D.R. Physico-chemical changes in rice bran oil during heating at frying temperature. J Food Sci Technol 51, 335–340 (2014). https://doi.org/10.1007/s13197-011-0495-9
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DOI: https://doi.org/10.1007/s13197-011-0495-9