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Antioxidant and Antimicrobial Activities of Ethanol Extract from the Stem and Leaf of Impatiens balsamina L. (Balsaminaceae) at Different Harvest Times

机译:不同收获时间凤仙花茎和叶中乙醇提取物的抗氧化和抑菌活性

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摘要

The aim of this study was to investigate the total phenolic content, total flavonoid contents, antioxidant activity and antimicrobial activity of ethanolic extract from stems (S) and leaves (L) of Impatiens balsamina L. (Balsaminaceae), which were harvested in Korea on March 10, 2011 (S1 and L1), May 14, 2011 (S2 and L2), and July 5, 2011 (S3 and L3), respectively. Our results revealed that the total phenolic (79.55–103.94 mg CE/g extract) and flavonoid (57.43–104.28 mg QE/g extract) contents of leaf extract were higher (p < 0.01) than those of stem extract. Leaf extracts (L1, L2, and L3) exhibited stronger (p < 0.01) free radical scavenging activity (66.06, 63.71, and 72.19%, respectively) than that of the positive control. In terms of antimicrobial activity, leaf extracts showed higher inhibitory effects against microorganisms than those of stem extracts (S1, S2, and S3). Among the leaf extracts at different harvest times, L3 showed the greatest antimicrobial activity against both Gram negative and Gram positive strains. From these results, the leaf extract from I. balsamina L. might be a valuable bioactive resource, and would seem to be applicable as a natural antioxidant in food preservation.
机译:本研究的目的是调查在韩国收获的凤仙花(Ispatiens balsamina L.)(Balsaminaceae)茎(S)和叶(L)乙醇提取物的总酚含量,总黄酮含量,抗氧化活性和抗菌活性。 2011年3月10日(S1和L1),2011年5月14日(S2和L2)和2011年7月5日(S3和L3)。我们的结果表明,叶提取物中的酚类总含量(79.55-103.94 mg CE / g提取物)和类黄酮(57.43-104.28 mg QE / g提取物)含量高于茎提取物(p <0.01)。叶提取物(L1,L2和L3)表现出比阳性对照更强的自由基清除活性(分别为66.06%,63.71%和72.19%)。就抗菌活性而言,叶提取物对微生物的抑制作用要比茎提取物(S1,S2和S3)高。在不同收获时间的叶片提取物中,L3对革兰氏阴性和革兰氏阳性菌株均表现出最大的抗菌活性。从这些结果来看,印度苦瓜的叶提取物可能是有价值的生物活性资源,并且似乎可用作食品防腐剂中的天然抗氧化剂。

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