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บทคัดย่อ

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Abstract

Karen landrace rice, which is upland rice, has abundant amount in Banka, Ratchaburi because this landscape is optimum for cultivating. Generally, rice has many benefits, such as reduced risk of cardiovascular diseases, diabetes, obesity, and cancer due to its antioxidant activity and bioactive phytochemical compounds. Therefore, this study focused on determination of antioxidant activity, total phenolic, and GABA contents of three varieties of Karen landrace rice (Chupoeng, Nangpania, and Kaodaeng). The antioxidant activity of the brown rice (BR) and germinated brown rice (GBR) extracts was investigated using DPPH free radical scavenging assay. The total phenolic and GABA contents were also determined by colorimetric assay. GBR extracts showed significantly higher antioxidant activity and total phenolic content than BR extracts (p<0.05). The GBR of Chupoeng (89.92 ± 0.38 %) and Kaodaeng (109.91± 6.21 mg Gallic acid/g of extract) revealed the highest antioxidant activity and total phenolic content respectively. Moreover, an influence of germinated time was studied by varying to 0, 12, 24, and 36h. The optimum germinated time that showed the highest GABA content of rice extracts is 12 h. The 12 h showed a significantly difference and Kaodaeng (22.38 ± 0.21 mg GABA/g of dry weight) exhibited the highest GABA contents compared with other varieties.