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  • microwave pretreatment of defatted rice bran for enhanced recovery of total phenolic compounds extracted by subcritical water

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 633
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     enhanced recovery of total phenolics (tp) from defatted rice bran (drb) subjected to prior microwave pretreatment was achieved by subcritical water extraction (swe). the effects of microwave pretreatment temperature (60–100 °c) and duration (0–30 min) were determined at raw material:water ratios (1:2 and 1:5) for swe under fixed conditions. optimal extraction was observed at 80 °c (for 10 min, at a ratio of 1:2). with pretreatment carried out under these conditions, a shorter extraction time of 10 min was required for swe at 200 °c. combining both optimized conditions, a tp yield of 190.4 ± 3.3 mg/g of drb was achieved, some 55% more than was found to be extractable from un-pretreated samples. the antioxidant activity of the extract was also greater, as indicated by a corresponding decrease in ic50 from 38.8 ± 0.4 to 27.7 ± 0.5 μg/ml.

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