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Journal of Food Science and Technology

, Volume 51, Issue 2, pp 335–340 | Cite as

Physico-chemical changes in rice bran oil during heating at frying temperature

  • Rangaswamy Baby Latha
  • D. R. NasirullahEmail author
Original Article

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%.

Keywords

Rice bran oil Heating Fatty acid Oxidation 

Notes

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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Copyright information

© Association of Food Scientists & Technologists (India) 2011

Authors and Affiliations

  1. 1.Department of Lipid Science and Traditional FoodsCentral Food Technological Research Institute (CSIR)MysoreIndia

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