In the present work, heat reflux extraction with ethanol/water (80:20; v/v) as the solvent was
used to extract antioxidants fromMyrmecodia pendans. The crude extract (CE) was fractionated
using hexane and ethyl acetate. Ethyl acetate fraction (EAF) and aqueous fraction were
collected. Antioxidant activity against 1,1-diphenyl-2-picrylhydrazyl-radical radical and ferric
reducing power of the CE, EAF, and aqueous fraction were evaluated. EAF showed comparable
antioxidant activity against 1,1-diphenyl-2-picrylhydrazyl-radical radical and ferric reducing
power to those of the CE. UV/visible, liquid chromatography/electrospray ionization/tandem
mass spectrometry, and high-performance liquid chromatography were employed for identifying
the major antioxidant compounds in the EAF. Three major phenolic compounds
(rosmarinic acid, procyanidin B1, and polymer of procyanidin B1) were identified. The first two
compounds were confirmed and quantified by high-performance liquid chromatography
using authentic standards, but confirmation of the third compound was hampered by a lack of
commercial standard. Concentrations of rosmarinic acid and procyanidin B1 in the EAF were
found to be 20.688± 1.573mg/g dry sample and 3.236±0.280mg/g dry sample, respectively. All
these three compounds are reported for the first time in sarang semut.
Copyright © 2014, Food and Drug Administration, Taiwan. Published by Elsevier Taiwan
LLC. All rights reserved
In the present work, heat reflux extraction with ethanol/water (80:20; v/v) as the solvent wasused to extract antioxidants fromMyrmecodia pendans. The crude extract (CE) was fractionatedusing hexane and ethyl acetate. Ethyl acetate fraction (EAF) and aqueous fraction werecollected. Antioxidant activity against 1,1-diphenyl-2-picrylhydrazyl-radical radical and ferricreducing power of the CE, EAF, and aqueous fraction were evaluated. EAF showed comparableantioxidant activity against 1,1-diphenyl-2-picrylhydrazyl-radical radical and ferric reducingpower to those of the CE. UV/visible, liquid chromatography/electrospray ionization/tandemmass spectrometry, and high-performance liquid chromatography were employed for identifyingthe major antioxidant compounds in the EAF. Three major phenolic compounds(rosmarinic acid, procyanidin B1, and polymer of procyanidin B1) were identified. The first twocompounds were confirmed and quantified by high-performance liquid chromatographyusing authentic standards, but confirmation of the third compound was hampered by a lack ofcommercial standard. Concentrations of rosmarinic acid and procyanidin B1 in the EAF werefound to be 20.688± 1.573mg/g dry sample and 3.236±0.280mg/g dry sample, respectively. Allthese three compounds are reported for the first time in sarang semut.Copyright © 2014, Food and Drug Administration, Taiwan. Published by Elsevier TaiwanLLC. All rights reserved
การแปล กรุณารอสักครู่..
