Light-mediated antibacterial activity of Lippia origanoides H.B.K. in vitro

An ethanol extract and different partition fractions obtained from Lippia origanoides H.B.K. were assayed for light-mediated activity against strains of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ). Identical assays were conducted with and without exposure to UV-A (400-315 nm...

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Bibliographic Details
Published in:Photochemical & photobiological sciences 2014-12, Vol.13 (12), p.165-1654
Main Authors: Barreto, Humberto M, Coelho, Bruno R. C, Menezes-Silva, Suellen M. P, Siqueira-Júnior, José P, Coutinho, Henrique D. M, Lemos, Izabel Cristina S, Sousa, Taciana O, Silva, Romézio A. C, Medeiros, Maria das Graças F, Citó, Antonia M. G. L, Lopes, José A. D
Format: Article
Language:English
Subjects:
Anti-Bacterial Agents - chemistry
Biochemistry
Biomaterials
Chemistry
Communication
Escherichia coli - drug effects
Escherichia coli - radiation effects
Flavanones - chemistry
Lippia - chemistry
Methylene Chloride - chemistry
Photosensitizing Agents - chemistry
Physical Chemistry
Plant Extracts - chemistry
Plant Sciences
Staphylococcus aureus - drug effects
Staphylococcus aureus - radiation effects
Ultraviolet Rays
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Summary:An ethanol extract and different partition fractions obtained from Lippia origanoides H.B.K. were assayed for light-mediated activity against strains of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ). Identical assays were conducted with and without exposure to UV-A (400-315 nm) light to test for light enhanced activity. The ethanol extract and dichloromethane fraction showed light-mediated activity against the S. aureus strain, but not against the E. coli strain. The dichloromethane fraction was more active than the ethanol extract. Naringenin did not display light-mediated activity against the tested bacteria, indicating that the light-mediated antimicrobial activity of the dichloromethane fraction is not due to its major component. The results represent the first report of light-mediated antimicrobial activity of Lippia origanoides and show that its phytochemicals could be used as light-mediated antimicrobial agents. An ethanol extract and different partition fractions obtained from Lippia origanoides H.B.K. were assayed for light-mediated activity against strains of S. aureus and E. coli .
ISSN:1474-905X
1474-9092
DOI:10.1039/c4pp00334a