Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/14312
Título: H. guilliermondii impacts growth kinetics and metabolic activity of s. cerevisiae: the role of initial nitrogen concentration
Autor: Lage, Patrícia
Barbosa, Catarina
Mateus, Beatriz
Vasconcelos, Isabel
Palavras-chave: Yeast
Nitrogen response
Alcoholic fermentation
Data: 2014
Editora: Elsevier
Citação: LAGE, Patrícia...[et al.] - H. guilliermondii impacts growth kinetics and metabolic activity of s. cerevisiae: the role of initial nitrogen concentration. International Journal of Food Microbiology. ISSN 0168-1605. Vol. 172 (2014), p. 62–69
Resumo: Non-Saccharomyces yeasts include different species which comprise an ecologically and biochemically diverse group capable of altering fermentation dynamics and wine composition and flavour. In this study, single- and mixed-culture of Hanseniaspora guilliermondii and Saccharomyces cerevisiae were used to ferment natural grape-juice, under two nitrogen regimes. In single-culture the strain H. guilliermondii failed to complete total sugar breakdown even though the nitrogen available has not been a limiting factor of its growth or fermentative activity. In mixed-culture, that strain negatively interfered with the growth and fermentative performance of S. cerevisiae, resulting in lower fermentation rate and longer fermentation length, irrespective of the initial nitrogen concentration. The impact of co-inoculation on the volatile compounds profilewasmore evident in thewines obtained from DAP-supplementedmusts, characterised by increased levels of ethyl and acetate esters, associated with fruity and floral character of wines. Moreover, the levels of fatty acids and sulphur compounds which are responsible for unpleasant odours that depreciate wine sensory quality were significantly lower. Accordingly, data obtained suggests that the strain H. guilliermondii has potential to be used as adjunct of S. cerevisiae in wine industry, although possible interactions with S. cerevisiae still need to be elucidated.
Peer review: yes
URI: http://hdl.handle.net/10400.14/14312
Aparece nas colecções:CBQF - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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