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Wine quality improvement through the combined utilisation of yeast hulls and C andida zemplinina / S accharomyces cerevisiae mixed starter cultures
Author(s) -
Zara G.,
Mannazzu I.,
Del Caro A.,
Budroni M.,
Pinna M.B.,
Murru M.,
Farris G.A.,
Zara S.
Publication year - 2014
Publication title -
australian journal of grape and wine research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.65
H-Index - 77
eISSN - 1755-0238
pISSN - 1322-7130
DOI - 10.1111/ajgw.12078
Subject(s) - winemaking , wine , yeast , food science , population , fermentation , starter , winery , malolactic fermentation , chemistry , biology , biochemistry , bacteria , medicine , lactic acid , environmental health , genetics
Background and Aims Interactions between different yeast species used as starters may lead to inconsistent results in mixed fermentations. The aim of this study was to assess the influence of different nutrients on the association between a wine strain of C andida zemplinina ( CDZ1 ) and a commercial wine strain of S accharomyces cerevisiae ( EC 1118) in mixed culture fermentations. Methods and Results Laboratory‐scale fermentations were carried out by inoculating CDZ1 and, after 3 days, EC 1118 with the simultaneous addition of diammonium phosphate, yeast hulls, ergosterol and oleic acid, each provided separately. The addition of yeast hulls resulted in a higher cell population of CDZ1 and in a higher glycerol concentration of wine as compared with that of the other fermentations. Pilot‐scale fermentations, carried out in a commercial winery, confirmed that the winemaking protocol based on the use of the mixed starters CDZ1 / EC 1118 with added yeast hulls results in wine with a higher glycerol content, more structured and persistent. Conclusions Addition of yeast hulls improved the fermentative performance of the mixed starters CDZ1 / EC 1118. Significance of the Study The high glycerol content of wines made with the combined use of yeast hulls and CDZ1 / EC 1118 mixed starters increases wine softness and body.