Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.18/574
Título: Activity of chitosan films against different microorganisms
Autor: Sanches-Silva, A.
Maia, C.
Furtado, R.
Ribeiro, T.
Paseiro, P.
Sendón, R.
Rodríguez-Bernaldo de Quirós, A.
López-Cervantes, J.
Sánchez-Machado, D.I.
Bueno, C.
Soto Valdez, H.
Angulo, I.
Aurrekoetxea, G.P.
Bilbao, A.
Costa, H.S.
Palavras-chave: Segurança Alimentar
Data: Mai-2011
Editora: Instituto Nacional de Saúde Doutor Ricardo Jorge, IP
Resumo: Chitosan is a hydrophilic polysaccharide which derives from chitin by deacetylation. It has several applications, namely as a film that can be applied to preserve the quality and increase the shelf-life of food. Chitosan is insoluble in most solvents but it is soluble in dilute organic acids such as formic acid and acetic acid[1]. The properties of chitosan depend on the degree of deacetylation (DA) and molecular weight (MW). A broad antimicrobial activity has been attributed to chitosan, either for gram-negative, gram-positive bacteria and fungi. The aim of the present study is to evaluate the antimicrobial activity of a chitosan film prepared by casting. The chitosan was obtained from shrimp waste collected from shrimp processing factories of South Sonora (Mexico). Four bacteria (Bacillus cereus; Escherichia coli; Staphylococcus aureus and Listeria monocytogenes) and one fungus (Botrytis cinerea) were evaluated. Although L. monocytogenes and B. cinerea growth was not inhibited by the chitosan film, results showed a clear growth-inhibitory effect, at the two bacteria concentration levels tested, for B. Cereus, E. coli and S. aureus. Different antibacterial mechanisms have been proposed to explain chitosan antimicrobial activity[2-3]: i) chitosan may form an external barrier which inhibits essential nutrients adsorption; ii) chitosan can also penetrate the microbial cell, disturbing the metabolism of the cell by inhibiting the mRNA and protein synthesis; iii) chitosan may have an ionic surface interaction with the bacteria originating wall cell leakage. Although these mechanisms may take place simultaneously, the antimicrobial activity may also depend on the properties of chitosan (DA and MW).
Peer review: yes
URI: http://hdl.handle.net/10400.18/574
Aparece nas colecções:DAN - Posters/abstracts em congressos internacionais

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
ISA2011_Microorganisms.pdf861,79 kBAdobe PDFVer/Abrir    Acesso Restrito. Solicitar cópia ao autor!

FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.