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Wine quality improvement through the combined utilisation of yeast hulls and Candida zemplinina/Saccharomyces cerevisiae mixed starter cultures

Zara, Giacomo and Mannazzu, Ilaria Maria and Del Caro, Alessandra and Budroni, Marilena and Pinna, Maria Barbara and Murru, Mariano and Farris, Giovanni Antonio and Zara, Severino (2014) Wine quality improvement through the combined utilisation of yeast hulls and Candida zemplinina/Saccharomyces cerevisiae mixed starter cultures. Australian Journal of Grape and Wine Research, Vol. 20 (2), p. 199-207. eISSN 1755-0238. Article.

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DOI: 10.1111/ajgw.12078

Abstract

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 Candida zemplinina (CDZ1) and a commercial wine strain of Saccharomyces cerevisiae (EC1118) in mixed culture fermentations.
Methods and Results: Laboratory-scale fermentations were carried out by inoculating CDZ1 and, after 3 days, EC1118 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/EC1118 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/EC1118.
Significance of the Study: The high glycerol content of wines made with the combined use of yeast hulls and CDZ1/EC1118 mixed starters increases wine softness and body.

Item Type:Article
ID Code:10786
Status:Published
Refereed:Yes
Uncontrolled Keywords:non-Saccharomyces yeast, sequential fermentation, wine yeast, yeast ghost
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/16 Microbiologia agraria
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Australian Society of Viticulture and Oenology
eISSN:1755-0238
Deposited On:17 Feb 2015 10:51

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