Infrared stabilization of rice bran and its effects on γ-oryzanol content, tocopherols and fatty acid composition
Neşe Yılmaz1, Necati Barış Tuncel, Habib Kocabıyık
1Department of Food Engineering, Faculty of Engineering, Onsekiz Mart University, 17020, Çanakkale, Turkey.
Background:
Rice bran is a nutritionally valuable by-product of paddy milling. In this study an experimental infrared (IR) stabilization system was developed to prevent rice bran rancidity. The free fatty acid content of raw and IR-stabilized rice bran samples was monitored every 15 days during 6 months of storage. In addition, energy consumption was determined.
Results:
The free fatty acid content of rice bran stabilized at 600 W IR power for 5 min remained below 5% for 165 days. No significant change in γ-oryzanol content or fatty acid composition but a significant decrease in tocopherol content was observed in stabilized rice bran compared with raw bran. IR stabilization was found to be comparable to extrusion with regard to energy consumption.
Conclusion:
IR stabilization was effective in preventing hydrolytic rancidity of rice bran. By optimizing the operational parameters of IR stabilization, this by-product has the potential for use in the food industry in various ways as a value-added commodity.
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