XÁC ĐỊNH TÍNH CHỐNG OXY HÓA CỦA VITAMIN C VÀ MỘT SỐ CAO ETHANOL THÔ CHIẾT TỪ THỰC VẬT BẰNG PHƯƠNG PHÁP FERRIC THIOCYANATE (FTC)
Abstract
Crude ethanolic extracts of cork-root bark, fig-haulm bark, and areca seed were used to determine antioxidation activity by Ferric Thiocyanate Method (FTC), and ascorbic acid was used as a standard agent. The results show that the antioxidation activity of ascorbic acid is (88.09 ± 0.27) %, cork-root bark crude ethanolic extract is (41.99 ± 0.07) %, fig-haulm bark crude ethanolic extract is (36.65 ± 0.07) %, and areca seed crude ethanolic extract is (79.16 ± 0.13) %. Comparing the obtained result with the antioxidation activity of vitamin C and standard ascorbic acid reveals the deviation of +8.37 %. Antioxidation activity results using DPPH (?,?-diphenyl-?-picrylhydrazyl) method show that the antioxidation activity percent of ascorbic acid, cork-root, fig-haulm, and areca seed crude ethanolic extracts in DPPH system by different SC50 values (?g/mL) are (91.0 ± 0.3) % by 9.37 (?g/mL), (77.9 ± 0.3) % by 32.28 (?g/mL), (82.9 ± 0.3) % by 27.3 (?g/mL), and (89.9 ± 0.2) % by 25.83 (?g/mL), respectively. Compared to the DPPH method, the results from FTC method indicate that the deviation of ascorbic acid is +2.06 %, cork-root bark is +25.09 %, fig-haulm bark is +32.70 %, and areca seed is +7.59 %.
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