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Research Article

Efficacy of Ozone against Different Strains of Brettanomyces bruxellensis on Winegrapes Postharvest and Impact on Wine Composition

Vasileios Englezos, Kalliopi Rantsiou, Fabrizio Torchio, Matteo Pollon, Simone Giacosa, Susana Río Segade, Vincenzo Gerbi, Luca Rolle, Luca Cocolin
Am J Enol Vitic. July 2019 70: 249-258; published ahead of print January 15, 2019 ; DOI: 10.5344/ajev.2019.18058
Vasileios Englezos
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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Kalliopi Rantsiou
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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Fabrizio Torchio
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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Matteo Pollon
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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Simone Giacosa
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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Susana Río Segade
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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Vincenzo Gerbi
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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Luca Rolle
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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Luca Cocolin
1Università degli Studi di Torino, Dipartimento di Scienze Agrarie, Forestali e Alimentari, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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  • For correspondence: lucasimone.cocolin@unito.it
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Abstract

Spoilage by Brettanomyces bruxellensis is a major concern for the wine industry. The negative effect of this yeast on wine quality, that is, potentially large associate economic losses and the production of phenolic off-flavors, requires application of specific control measures. We investigated the ability of ozone to control the B. bruxellensis population on treated Barbera winegrape berries, and the impact on subsequent winemaking or fermentation. To further explore the ability of ozone treatments to reduce the B. bruxellensis population, a mix of three different strains was artificially inoculated onto the surface of grape berries. Grape berries were ozone-treated either in aqueous (6 or 12 min) or gaseous form (12 or 24 hr), crushed, then fermented to evaluate the effect of these treatments on B. bruxellensis and Saccharomyces cerevisiae growth dynamics and wine composition. Microbiological analysis revealed a significant reduction in B. bruxellensis of ~2.2 log colony forming units (CFU)/mL after treatment with gaseous ozone for 24 hr. The wines produced from grape berries previously exposed to gaseous ozone for 24 hr contained the lowest levels of acetic acid. Moreover, 4-ethylphenols were detected in wines produced from grape berries treated with water (6 or 12 min), in which B. bruxellensis population reached 5.0 log CFU/mL at the end of fermentation. Molecular analysis suggested that the three tested strains had similar sensitivity to the ozone treatments applied. This study shows the first results about the ability of ozone to control the population of different B. bruxellensis strains within the same species in the same manner.

  • Brettanomyces bruxellensis
  • ethylphenol
  • ozone
  • sanitation
  • winegrapes
  • Received June 2018.
  • Revision received December 2018.
  • Accepted January 2019.
  • ©2019 by the American Society for Enology and Viticulture
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Efficacy of Ozone against Different Strains of Brettanomyces bruxellensis on Winegrapes Postharvest and Impact on Wine Composition
Vasileios Englezos, Kalliopi Rantsiou, Fabrizio Torchio, Matteo Pollon, Simone Giacosa, Susana Río Segade, Vincenzo Gerbi, Luca Rolle, Luca Cocolin
Am J Enol Vitic.  July 2019  70: 249-258;  published ahead of print January 15, 2019 ; DOI: 10.5344/ajev.2019.18058

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Efficacy of Ozone against Different Strains of Brettanomyces bruxellensis on Winegrapes Postharvest and Impact on Wine Composition
Vasileios Englezos, Kalliopi Rantsiou, Fabrizio Torchio, Matteo Pollon, Simone Giacosa, Susana Río Segade, Vincenzo Gerbi, Luca Rolle, Luca Cocolin
Am J Enol Vitic.  July 2019  70: 249-258;  published ahead of print January 15, 2019 ; DOI: 10.5344/ajev.2019.18058
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