کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1187926 963477 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Antioxidant components and properties of five long-grained rice bran extracts from commercial available cultivars in Thailand
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Antioxidant components and properties of five long-grained rice bran extracts from commercial available cultivars in Thailand
چکیده انگلیسی

Five varieties of long-grained rice bran, which are the most commonly cultivated varieties in Thailand, are abundant in antioxidant components. The antioxidative activity of rice bran extracts was investigated using various established in vitro systems, including 2,2′-diphenyl-1-picrylhdrazyl free radical-scavenging (DPPH), total reducing power, ferrous ion-chelating activity and lipid peroxidation inhibition. The total phenolic and flavonoid contents, and gamma-oryzanol, tocopherol and tocotrienol isomer contents of rice bran extract were also determined by colorimetric assay and high performance liquid chromatography. The methanolic rice bran extracts produced strong results with DPPH free radical-scavenging (EC50 0.38–0.74 mg/ml), reducing power (EC50 0.10–0.53 mg/ml), ferrous ion-chelating activity (EC50 0.11–0.55 mg/ml) and inhibition of lipid peroxidation (EC50 0.14–0.57 mg/ml). Total phenolic and flavonoid contents, and gamma-oryzanol, tocopherol and tocotrienol contents of rice bran extract were in the range 2.2–3.2, 0.03–0.10, 0.56–1.08, 0.35–0.77 and 0.22–0.46 mg/g rice bran, respectively. These results indicated that the methanolic components of the long-grained rice bran extracts might potentially be natural antioxidants.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 111, Issue 3, 1 December 2008, Pages 636–641
نویسندگان
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