Changes in ochratoxin A concentration during winemaking

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Anabela Fernandes (Author) Other; Nuno Ratola (Author) FEUP; António Cerdeira (Author) Other; Arminda Alves (Author) FEUP; Armando Venâncio (Author) Other

Journal

Title: American Journal of Enology and Viticulture

Vol. 58 No. 1

Pages: 92-96

ISSN: 0002-9254

Publisher: American Society for Enology and Viticulture

Indexing

ISI Web of Knowledge - 32 Citations

ISI Web of Science

Scopus - 39 Citations

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

Other information

Authenticus ID: P-004-CDP

Abstract (EN): The effects of common winemaking procedures on ochratoxin A (OTA) concentrations in the Portuguese wine Vinho Verde were studied. Natural contamination of grapes was not observed, so grapes for vinification were inoculated with Aspergillus carbonarius. Ochratoxin A concentration in these grapes ranged from 0.43 to 7.48 ¿g/kg. Vinification consistently reduced OTA concentrations in wine independent of the initial OTA concentration in grapes. Mean carry-over of OTA from grapes to wine was 8.1% (w/w) after malolactic fermentation, even without use of enological adjuvants (fining agents). Reduction in OTA was associated with removal of spent fractions during winemaking, such as wine lees after fermentation or sediment after racking. OTA concentrations were higher in these fractions than in the original grapes. Degradation by yeast or bacteria was not observed under the tested conditions.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5