title: Antioxidant and antimicrobial activities of ethanol extract from the stem and leaf of Impatiens balsamina L. (Balsaminaceae) at different harvest times.
abstract: 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.
authors.affiliation: Department of Animal Resources Technology, Gyeongnam National University of Science and Technology, Gyeongnam 660-758, Korea.
authors.forename: Suk-Nam
authors.initials: SN
authors.lastname: Kang
authors.forename: Young-Min
authors.initials: YM
authors.lastname: Goo
authors.forename: Mi-Ra
authors.initials: MR
authors.lastname: Yang
authors.forename: Rashid Ismael Hag
authors.initials: RI
authors.lastname: Ibrahim
authors.forename: Jae-Hyeon
authors.initials: JH
authors.lastname: Cho
authors.forename: Il-Suk
authors.initials: IS
authors.lastname: Kim
authors.forename: Ok-Hwan
authors.initials: OH
authors.lastname: Lee
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry / Q000494:pharmacology*; D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D000431:Ethanol; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000737:chemistry / Q000494:pharmacology; D005609:Free Radicals / Q000037:antagonists & inhibitors; D029069:Impatiens / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D010636:Phenols / Q000737:chemistry / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry*; D012621:Seasons
chemical_list: D000890:Anti-Infective Agents; D000975:Antioxidants; D005419:Flavonoids; D016166:Free Radical Scavengers; D005609:Free Radicals; D010636:Phenols; D010936:Plant Extracts; D000431:Ethanol