Abstract
This study was undertaken to evaluate the effect of Alternathera brasiliana (Amaranthaceae) extracts as photosensitizing agents in photodynamic antimicrobial therapies (PACT) against Staphylococcus aureus, Staphylococcus epidermidis and Candida dubliniensis. The crude hexane and ethanol extracts were obtained from A. brasiliana whole plant and showed absortion from 650 to 700nm. Also, singlet molecular oxygen (1O2) production (type II photosensitization reaction) was examined, and the results show that 1,3-diphenylisobenzofuran photodegradation was greatly enhanced in the presence of the A. brasiliana extracts. One plate in each assay was irradiated while the other was not irradiated, the number of colony-forming units per milliliter (CFU/mL) was obtained, and data analyzed by the Tukey test. The chemical composition of the extracts was determined by chromatographic and spectrometric techniques; steroids, triterpenes, and flavonoids were identified. Laser irradiation alone at 685nm using diode laser, output power of 35mW, and energy of 28 J/cm2, or non-irradiated crude extracts in sub-inhibitory concentration did not reduce the number of CFU/mL significantly, whereas irradiated hexane and ethanol extracts, in sub-inhibitory concentrations, inhibited the growth of these microorganisms. The photoactivation of hexane and ethanol extracts of A. brasiliana, in sub-inhibitory concentrations, using red laser radiation at 685nm had an antimicrobial effect.
Keywords: Alternanthera brasiliana, antimicrobial therapy, PACT, PDT, photosensitizer.
Current Drug Targets
Title:Photodynamic Inactivation of Yeast and Bacteria by Extracts of Alternanthera brasiliana
Volume: 14 Issue: 9
Author(s): Nathalia L. Andreazza, Caroline C. de Lourenco, Carlos A. T. Siqueira, Alexandra C.H.F. Sawaya, Tadia F. Lapinski, Adriana Gasparetto, Sonia Khouri, Stella R. Zamuner, Egberto Munin and Marcos Jose Salvador
Affiliation:
Keywords: Alternanthera brasiliana, antimicrobial therapy, PACT, PDT, photosensitizer.
Abstract: This study was undertaken to evaluate the effect of Alternathera brasiliana (Amaranthaceae) extracts as photosensitizing agents in photodynamic antimicrobial therapies (PACT) against Staphylococcus aureus, Staphylococcus epidermidis and Candida dubliniensis. The crude hexane and ethanol extracts were obtained from A. brasiliana whole plant and showed absortion from 650 to 700nm. Also, singlet molecular oxygen (1O2) production (type II photosensitization reaction) was examined, and the results show that 1,3-diphenylisobenzofuran photodegradation was greatly enhanced in the presence of the A. brasiliana extracts. One plate in each assay was irradiated while the other was not irradiated, the number of colony-forming units per milliliter (CFU/mL) was obtained, and data analyzed by the Tukey test. The chemical composition of the extracts was determined by chromatographic and spectrometric techniques; steroids, triterpenes, and flavonoids were identified. Laser irradiation alone at 685nm using diode laser, output power of 35mW, and energy of 28 J/cm2, or non-irradiated crude extracts in sub-inhibitory concentration did not reduce the number of CFU/mL significantly, whereas irradiated hexane and ethanol extracts, in sub-inhibitory concentrations, inhibited the growth of these microorganisms. The photoactivation of hexane and ethanol extracts of A. brasiliana, in sub-inhibitory concentrations, using red laser radiation at 685nm had an antimicrobial effect.
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Andreazza L. Nathalia, de Lourenco C. Caroline, Siqueira A. T. Carlos, Sawaya C.H.F. Alexandra, Lapinski F. Tadia, Gasparetto Adriana, Khouri Sonia, Zamuner R. Stella, Munin Egberto and Salvador Jose Marcos, Photodynamic Inactivation of Yeast and Bacteria by Extracts of Alternanthera brasiliana, Current Drug Targets 2013; 14 (9) . https://dx.doi.org/10.2174/1389450111314090010
DOI https://dx.doi.org/10.2174/1389450111314090010 |
Print ISSN 1389-4501 |
Publisher Name Bentham Science Publisher |
Online ISSN 1873-5592 |
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