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Research articles

ScienceAsia 42(2016): 75-82 |doi: 10.2306/scienceasia1513-1874.2016.42.075


Pretreatment to increase yield and antioxidant activity of γ-oryzanol in rice bran oil


Duangkamol Ruen-Ngama,*, Chitti Thawaia, Sujitra Sukonthamutb

 
ABSTRACT:     Six pretreatment processes to extract oil from Khao Dok Mali 105 rice bran were tested to assess the effect of the processes on the γ-oryzanol content and DPPH scavenging activity of the extract. The pretreatment processes consisted of the following: microwave heating (60–110 °C), hot air heating (70–180 °C), roasting (60–80 °C), parboiling (70 °C), autoclaving (121 °C), and enzyme (amylase) treatment (50 °C). The highest amount of oil was obtained by hot air heating (70 °C) of 0.27 g/g of dried rice bran, whereas the highest γ-oryzanol yield was obtained by parboiling 9.8 mg/g of dried rice bran. The highest γ-oryzanol concentration obtained with a roasting pretreatment (60 °C) was 46.9 mg/ml of rice bran oil.

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a Department of Biology, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520 Thailand
b Department of Statistics, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520 Thailand

* Corresponding author, E-mail: duangkamol.ru@kmitl.ac.th

Received 25 Dec 2014, Accepted 11 Mar 2016