ปริมาณฟีนอลและปริมาณฟลาโวนอยด์รวม ฤทธิ์ต้านออกซิเดชัน  และฤทธิ์ยับยั้งกิจกรรมของเอนไซม์แอลฟาอะไมเลสของข้าวพื้นเมือง 4 สายพันธุ์

Porntip Khampa; Aroon   Jankham; Supannee  Aoki; Phukphon  Munglue

Authors

Porntip Khampa 1 Program of Science Education, Faculty of Science, Ubon Ratchathani Rajabhat University
Aroon Jankham Program of Chemistry, Faculty of Science, Ubon Ratchathani Rajabhat University
Supannee Aoki Program of Biology, Faculty of Science, Ubon Ratchathani Rajabhat University
Phukphon Munglue Program of Biology, Faculty of Science, Ubon Ratchathani Rajabhat University

Keywords:

local rice varieties, phytochemicals, antioxidation, alpha-amylase

Abstract

This study examined total phenolic and flavonoid contents, antioxidant activity, and alpha-amylase inhibitory activity of four local rice varieties, including Selabporn, Kusuma, Phetratri, and Vessantara. Rice samples were extracted with distilled water. The highest contents of total phenolic compound and total flavonoid were found in Selabporn (20.72±0.31 mg GAE/20 g gain weight and 72.62±8.19 mg QE/20 g gain weight, respectively) when compared with other rice varieties. Additionally, antioxidant activity tested by using DPPH assay and alpha-amylase inhibitory activity of Selabporn showed the lowest IC₅₀ values of 139.24±1.53 µg/mL and 4.78±0.44 mg/mL, respectively. The results of this study indicated the antioxidant property and alpha-amylase inhibitory activities of four local rice varieties, which may have a potential functional food for maintaining the blood glucose level.

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