Studies on the effect of ethephon at 0, 100, 200, 300 and 400 ppm on anthocyanin content and antioxidant activities in tuberous root of Red Kwao Krua (RKK) (Butea superba Roxb.) of RKK were conducted. Ethephon at 300 and 400 ppm resulted in a highly significant effect on the thickness of cortex and the amount of anthocyanin in the tuberous roots (P< 0.01 ). Using the DPPH technique and Trolox as the control, results showed that IC50 of all RKK extracts was different (P< 0.01 ). RKK crude extracts sprayed with ethephon at 300 and 400 ppm gave the highest antioxidant activities.
Thawibut, c., Opassiri, R. and Manakasem. Y.
School of Crop Production Technology, Institute of Agricultural Technology, Suranaree University of Technology 111 University Avenue, Sub District Suraneree, Muang District, Nakhon Ratchasima 30000, Thailand
School of Chemlst,y, Institute of Science, Suranaree University of Technology 111 University Avenue, Sub District Suranaree, Muang District, Nakhon Ratchasima 30000, Thailand
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