Role of Grape-Extractable Polyphenols in the Generation of Strecker Aldehydes and in the Instability of Polyfunctional Mercaptans during Model Wine Oxidation

Bueno-Aventín, Elena (Universidad de Zaragoza) ; Escudero, Ana (Universidad de Zaragoza) ; Fernández-Zurbano, Purificación ; Ferreira, Vicente (Universidad de Zaragoza)

Resumen: Polyphenolic fractions from Garnacha, Tempranillo, and Moristel grapes were reconstituted to form model wines of identical pH, ethanol, amino acid, metal, and varietal polyfunctional mercaptan (PFM) contents. Models were subjected to a forced oxidation procedure at 35 °C and to an equivalent treatment under strict anoxia. Polyphenolic profiles significantly determined oxygen consumption rates (5.6-13.6 mg L-1 day-1), Strecker aldehyde (SA) accumulation (ratios max/min around 2.5), and levels of PFMs remaining (ratio max/min between 1.93 and 4.53). By contrast, acetaldehyde accumulated in small amounts and homogeneously (11-15 mg L-1). Tempranillo samples, with highest delphinidin and prodelphinidins and smallest catechin, consume O2 faster but accumulate less SA and retain smallest amounts of PFMs under anoxic conditions. Overall, SA accumulation may be related to polyphenols, producing stable quinones. The ability to protect PFMs as disulfides may be negatively related to the increase in tannin activity, while pigmented tannins could be related to 4-methyl-4-mercaptopentanone decrease. © 2021 The Authors. Published by American Chemical Society.

Idioma: Inglés

DOI: 10.1021/acs.jafc.1c05880

Año: 2021

Publicado en: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 69 (2021), 15290-15300
ISSN: 0021-8561

Factor impacto JCR: 5.895 (2021)

Categ. JCR: AGRICULTURE, MULTIDISCIPLINARY rank: 6 / 60 = 0.1 (2021) - Q1 - T1
Categ. JCR: FOOD SCIENCE & TECHNOLOGY rank: 32 / 144 = 0.222 (2021) - Q1 - T1
Categ. JCR: CHEMISTRY, APPLIED rank: 14 / 73 = 0.192 (2021) - Q1 - T1

Factor impacto CITESCORE: 8.6 - Agricultural and Biological Sciences (Q1)

Factor impacto SCIMAGO: 1.018 - Chemistry (miscellaneous) (Q1) - Agricultural and Biological Sciences (miscellaneous) (Q1)

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Analítica (Dpto. Química Analítica)