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Volume 42 Number 2 Volume 42 Number 3

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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 0 0000