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标题：Evaluation of the antioxidant activity of the leaves of acerola, guabiroba and ora-pro-nobis
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作者：Denise Alves Vieira ; Pauline Sambugaro Santos ; Charles Windson Isidoro Haminiuk 等
期刊名称：Revista Brasileira de Pesquisa em Alimentos
印刷版ISSN：2179-3174
电子版ISSN：2236-6563
出版年度：2010
卷号：1
期号：2
页码：129-134
语种：Portuguese
出版社：Universidade Tecnológia Federal do Paraná
摘要：The objective of this work was to quantify the total content of phenolic compounds and the antioxidant activity of ethanolic extracts of acerola, guabiroba and ora-pro-nobis leaves. The analysis was performed by the DPPH free-radical method, aiming to find plants with potential use as natural antioxidants in foodstuff. In the extraction of phenolic compounds from leaves, acidified methanol 80% showed superior performance when compared to ethanol 80%. It was found the amounts of 1656.66, 5196.66 and 1693.33 mg GAE (gallic acid equivalent)/100 g for acerola, guabiroba and ora-pro-nobis leaves, respectively. Ethanolic extracts of guabiroba and ora-pro-nobis leaves (8.57 µg GAE/mL) presented higher antioxidant activity (92.6 and 92.76%, respectively) than BHT (10.13%), ascorbic acid (19.25%) and similar to trolox (92.79%). The extract of ora-pro-nobis presented the lowest IC 50 (3.22 μg GAE/mL) showing a good ability to capture the DPPH radical. DOI: http://dx.doi.org/10.14685/rebrapa.v1i2.29
关键词：Extracts from leaves;Phenolic compounds;Antioxidant activity;DPPH radical