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A new depsidone and antibacterial activities of compounds from Usnea undulata Stirton.
MedLine Citation:
PMID:  22115039     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Usnea undulata Stirton (Usneaaceae) is a fruticose lichen used locally in ethnoveterinary medicine to treat mammary infections in cattle while human beings use it for the treatment of wounds in Eastern Cape, South Africa. Bioactivity-guided fractionation of its extracts led to the isolation and characterization of a new depsidone, 2'-O-methylhypostictic acid (8), together with seven known compounds, i.e. methyl β-orsellinate (1), norstictic acid (2), menegazziaic acid (3), (+) usnic acid (4), hypoconstictic acid (5), salazinic acid (6), and galbinic acid (7). The structures of the compounds were elucidated on the basis of their spectral analysis including homo- and hetero-nuclear correlation NMR experiments (COSY, NOESY, HMQC, and HMBC) and mass spectra as well as by comparison with available data in the literature. The minimum inhibitory concentrations (MICs) values of the compounds against six bacteria were determined. Compound 8 showed inhibitory activity against Bacillus cereus, Bacillus subtilis, and Staphylococcus epidermidis with MICs of 31, 62.5, 62.5 μg/ml, respectively. (+) Usnic acid was most active against B. subtilis, B. cereus, Staphylococcus aureus, and Escherichia coli with MICs of 8, 8, 31, and 31 μg/ml, respectively, while other compounds exhibited moderate activity.
Authors:
Nasim Sultana; Anthony Jide Afolayan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of Asian natural products research     Volume:  13     ISSN:  1477-2213     ISO Abbreviation:  J Asian Nat Prod Res     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-11-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888334     Medline TA:  J Asian Nat Prod Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1158-64     Citation Subset:  IM    
Affiliation:
a Analytical Research Division, BCSIR Laboratories Dhaka, Bangladesh Council of Scientific and Industrial Research (BCSIR) , Dr. Qudrat-i-Khuda Road, Dhanmondi , Dhaka , 1205 , Bangladesh.
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