Inactivation kinetics of Bacillus cereus vegetative cells and spores from different sources by antimicrobial photodynamic treatment (aPDT)

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dc.creatorLeonardo do Prado-Silva
dc.creatorVerônica Ortiz Alvarenga
dc.creatorGilberto Úbida Leite Braga
dc.creatorAnderson de Souza Sant'Ana
dc.date.accessioned2023-04-03T19:43:29Z
dc.date.accessioned2025-09-08T23:52:39Z
dc.date.available2023-04-03T19:43:29Z
dc.date.issued2021-05
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1016/j.lwt.2021.111037
dc.identifier.issn0023-6438
dc.identifier.urihttps://hdl.handle.net/1843/51500
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofLWT
dc.rightsAcesso Aberto
dc.subjectTratamento fotodinâmico antimicrobiano
dc.subjectCélulas vegetativas
dc.subjectEsporos de Bacillus cereus
dc.subject.otherPhenothiazine dye
dc.subject.otherSpoilage
dc.subject.otherPathogen
dc.subject.otherNonthermal treatment
dc.subject.otherEmerging technology
dc.titleInactivation kinetics of Bacillus cereus vegetative cells and spores from different sources by antimicrobial photodynamic treatment (aPDT)
dc.typeArtigo de periódico
local.citation.epage7
local.citation.spage1
local.citation.volume142
local.description.resumoAntimicrobial photodynamic treatment (aPDT) is a promising alternative to conventional thermal inactivation methods. This study aimed to evaluate Bacillus cereus vegetative cells' inactivation and spores by aPDT with new methylene blue (NMB) as photosensitizer (PS) using red light. The efficacy of aPDT was determined initially by minimal inhibitory concentration (MIC) of NMB at different concentrations and fluences. Cluster analysis from the results of MIC grouped B. cereus strains according to their aPDT susceptibility. Then, four strains (B63, B3, 436, and ATCC 14579) were selected for a survival study of aPDT with NMB in three concentrations (5, 50, and 100 μM). The viability of B. cereus vegetative cells and spores was reduced in all tested fluences. The strain ATCC 14579 (vegetative cells and spores) was the most susceptible to aPDT at relatively low fluence (25 J/cm2). The Weibull model presented a good fit for the inactivation data estimating the kinetic parameters δ (first decimal reduction) and p (shape parameter). This study contributes to the knowledge of the behavior of different strains of B. cereus regarding an emerging method of microbial inactivation. The variability of inactivation among strains will allow the development of more reliable processes.
local.publisher.countryBrasil
local.publisher.departmentFAR - DEPARTAMENTO DE ALIMENTOS
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0023643821001900

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