Abstract
Pineapple (Ananas comosus) is a kind of fruit with high nutritional value. This study investigated the resistance to oxidation DPPH (2,2-Diphenyl-1picrylhydrazyl (free radical) and deionized Fe3+ of ethanol extracts from theleaves (leaves grow on stems) and crown (crown of scale leaves) of pineapples. Study of high extraction efficiency in 99,5% ethanol solvent, mixing ratio between samples with the solvent is 1 : 4, combined ultrasonic wave with a capacity of 120 Walt within 72 hours. The total polyphenol content in all treatments was high: leave sample (140,9 ± 2,86 mg GAE/g) and crown sample (204,6 ± 0,29 mg GAE/g). The results showed thatDPPH oxidation resistance and deionized Fe3+ were: crown (IC50 = 254,74 ± 1,55 mg/mL và 908,12 ± 9,35 mg/mL) higher than leaves (IC50 = 977,78 ± 30,27m mg/mL and 2156,62 ± 23,03 mg/mL). Theresearch has found that the use of waste products from pineapple peels with antioxidant capacity could be added to potential raw materials in the field of pharmaceutical production.
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