Linked Life Data

19441007

Source:http://linkedlifedata.com/resource/pubmed/id/19441007

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2009-12-30
pubmed:abstractText
Bioassay-guided investigation of the stems of Maackia fauriei led to the isolation of seven flavonoid constituents, formononetin (1), genistein (2), daidzein (3), texasin (4), tectorigenin (5), odoratin (6) and mirkoin (7). Their structures were elucidated on the basis of spectral studies as well as by comparison with literature data. Tyrosinase inhibition activities were carried out on the isolated compounds. Among these, mirkoin (7) was identified as a potent tyrosinase inhibitor. It inhibited mushroom tyrosinase with an IC(50) value of 0.005 mm, which is ten times more active than kojic acid (IC(50) = 0.045 mm). The inhibition kinetics, analysed by Lineweaver-Burk plots, indicated mirkoin (7) to be a competitive inhibitor of tyrosinase when L-tyrosinase was used as a substrate. The results suggest that hydroxyl groups at C-4' in the B ring of flavonoids play an important role in the tyrosinase inhibition activities. Interestingly, compounds 4-7 were isolated for the first time from this plant.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
1099-1573
pubmed:author
pubmed:copyrightInfo
(c) 2009 John Wiley & Sons, Ltd.
pubmed:issnType
Electronic
pubmed:volume
24
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
70-5
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Tyrosinase inhibitory constituents from the stems of Maackia fauriei.
pubmed:affiliation
Department of Chemistry, Cheju National University, Ara-1, Jeju 690-756, Korea.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't