Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/9210
Título: Efeito do quitosano em leveduras de alteração de vinhos
Autor: Gomes, Janine Machado
Orientador: Malfeito Ferreira, Manuel
Camilo, Sofia Fernandes
Palavras-chave: chitosan
wine
Brettanomyces bruxellensis
Saccharomyces cerevisiae
Zygosaccharomyces ballii
minimum lethal concentration
Data de Defesa: 2015
Editora: ISA/UL
Citação: Gomes, J.M. - Efeito do quitosano em leveduras de alteração de vinhos. Lisboa: ISA, 2015, 40 p.
Resumo: Chitosan has been known for its antimicrobial activity, particularly in wine industry. The purpose of this study was to investigate the effect of chitosan against three different species of spoilage yeasts in wine: Brettanomyces bruxellensis, Saccharomyces cerevisiae and Zygosaccharomyces bailii. The results showed that increasing levels of chitosan (No Brett Inside®) enhance the inhibitory effect. However, despite of the highest concentration tested of 1 g.L-1 had an inhibitory effect on S. cerevisiae growth, it did not induce cell death. On the other hand, it was possible to determine minimum lethal concentration of 0,5 and 0,1 g.L-1, for B. bruxellensis and Z. bailii, respectively. Knowing that the maximum concentration allowed by law is of 0,1 g.L-1, it was concluded that chitosan is only effective against this latter specie. Additionally, another brand of chitosan (OenoBrett®) was tested which efficacy was similar to the previous one, after the end of the study, at concentrations of 0,05; 0,1 and 0,5 g.L-1, for Z. bailii, B. bruxellensis e S. cerevisiae, respectively. The production of 4-ethylphenol of B. bruxellensis with 0,1 g.L-1 of OenoBrett® chitosan was also evaluated and it was concluded that this specie did not produce volatile phenols, probably due to the absence of growth during the testing period
Descrição: Mestrado em Engenharia Alimentar - Processamento de Alimentos - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/9210
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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Tese Final Janine.pdf1,15 MBAdobe PDFVer/Abrir


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