Role of Toluidine Blue-O Binding Mechanism for Photooxidation in Bioinspired Bacterial Membranes

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorAlmeida, Alexandre M. [UNESP]-
Autor(es): dc.creatorOliveira, Osvaldo N.-
Autor(es): dc.creatorAoki, Pedro H. B. [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:24:06Z-
Data de disponibilização: dc.date.available2022-02-22T00:24:06Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2019-12-23-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1021/acs.langmuir.9b03045-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/198280-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/198280-
Descrição: dc.descriptionThe alarming increase in bacterial resistance to antibiotics has demanded new strategies for microbial inactivation, which include photodynamic therapy whose activity relies on the photoreaction damage to the microorganism membrane. Herein, the binding mechanisms of the photosensitizer toluidine blue-O (TBO) on simplified models of bacterial membrane with Langmuir monolayers of 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE) and 1,2-dioleoyl-sn-glycero-3-phospho-(1′-rac-glycerol) (DOPG) were correlated to the effects of the photoinduced lipid oxidation. Langmuir monolayers of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) were also used as a reference of mammalian membranes. The surface pressure isotherms combined with polarization-modulated infrared reflection absorption spectroscopy revealed that TBO expands DOPC, DOPE, and DOPG monolayers owing to electrostatic interactions with the negatively charged groups in the phospholipids, with a stronger adsorption on DOPG, which has a net surface charge. Light irradiation made the TBO-containing DOPC and DOPE monolayers less unstable as a result of the singlet oxygen (1O2) reaction with the chain unsaturation and hydroperoxide formation. In contrast, the decreased stability of the irradiated TBO-containing DOPG monolayer suggests the cleavage of carbon chains. The anionic nature of DOPG allowed a deeper penetration of TBO into the chain region, favoring contact-dependent reactions between the excited triplet state of TBO and lipid unsaturations or/and hydroperoxide groups, which is the key for the cleavage reactions and further membrane permeabilization.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionSão Paulo State University (UNESP) School of Sciences Humanities and Languages-
Descrição: dc.descriptionIFSC São Carlos Institute of Physics University of São Paulo (USP)-
Descrição: dc.descriptionSão Paulo State University (UNESP) School of Sciences Humanities and Languages-
Formato: dc.format16745-16751-
Idioma: dc.languageen-
Relação: dc.relationLangmuir-
???dc.source???: dc.sourceScopus-
Título: dc.titleRole of Toluidine Blue-O Binding Mechanism for Photooxidation in Bioinspired Bacterial Membranes-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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