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In vitro antioxidant and radical scavenging of Guinean kinkeliba leaf (Combretum micranthum G. Don) extracts.
MedLine Citation:
PMID:  21480049     Owner:  NLM     Status:  Publisher    
The antioxidant properties of the water and ethanol leaf extracts of kinkeliba (Combretum micranthum) were investigated, including scavenging of the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical (IC(50) values: 8.02 ± 0.34 for the ethanol extract [KE] and 9.1 ± 0.28 for the water extract [KW]), the 2,2'-azinobis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical (IC(50) values: 7.4 ± 0.14 for KE and 11.8 ± 0.01 for KW) and the hydroxyl radical (58.1% for KE and 61.1% for KW). The ferric thiocyanate method, reducing power, metal chelating activity, an assay of protein oxidation and the β-carotene-linoleic bleaching assay were also used. Butylated hydroxytoluene and ascorbic acid were used as the reference antioxidant compounds. At 20 mg mL(-1) concentration, KW and KE provided 36.8% and 75.1% inhibition of lipid peroxidation of linoleic acid emulsion, respectively. The IC(50) values of the ethanol extract in ABTS and DPPH tests were significantly lower than those from the water extract. Furthermore, crude polyphenols were extracted from kinkeliba leaf with 90% ethanol solution using a water bath treatment and then purified by a macroporous resin, AB-8. The polyphenols from kinkeliba leaf were subjected to analyses by RP-HPLC and ESI-MS. The dominant polyphenols in kinkeliba leaf were identified as gallic acid, rutin trihydrate, (+)-catechin and benzoic acid.
Alhassane Toure; Xueming Xu; T Michel; M Bangoura
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-1-01
Journal Detail:
Title:  Natural product research     Volume:  -     ISSN:  1478-6427     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-4-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101167924     Medline TA:  Nat Prod Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1-12     Citation Subset:  -    
State Key Laboratory of the School of Food Science and Technology, Jiangnan University, Wuxi 214122, P.R. China.
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