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- Title
Effect of subcritical water technique and ethanolic solvent on total phenolic contents and antioxidant capacity of Thai rice plant (O. Sativa cv. Khao Dawk Mali 105).
- Authors
Rodsamran, P.; Sothornvit, R.
- Abstract
Thai rice plant cv. Khao Dawk Mali 105 is an interesting sustainable bioresource which can be extracted as a natural antioxidants. The 15 days of cultivating stage and fresh rice plant extracted by absolute ethanol at 60°C for 0.5 h provided the highest total phenolic contents (TPC). Moreover, increasing ethanol concentration from 0% to 80% also increased TPC (from 67.26 to 116.09 mg GAE/ g DW and from 58.20 to 107.07 mg CAE/ g DW for gallic acid and caffeic acid, respectively) and antioxidant capacity (IC50 decreased from 1.43 to 0.64 mg DW/ mL) of the extract. Nevertheless, a higher temperature and longer time of subcritical water extraction (SWE) showed the highest TPC of the extract. In contrast, antioxidant capacity increased as increasing time at a low temperature and decreased as increasing time at a high temperature. The extract from SWE at 150°C for 20 min showed higher TPC (143.89 mg GAE/ g DW and 103.79 mg CAE/ g DW for gallic acid and caffeic acid, respectively); however, the organic extraction using 80% ethanol at 60°C for 5 h presented higher antioxidant capacity (0.64 mg DW/ mL). Therefore, SWE requires a shorter extraction time with safe for the environment and the extract is suitable for food components.
- Publication
International Food Research Journal, 2017, Vol 24, Issue 4, p1676
- ISSN
1985-4668
- Publication type
Academic Journal