121087 20230519145554.0 doi 10.1021/acs.jafc.1c05880 sideral 128029 ART-2021-128029 eng Bueno-Aventín, Elena Universidad de Zaragoza Role of Grape-Extractable Polyphenols in the Generation of Strecker Aldehydes and in the Instability of Polyfunctional Mercaptans during Model Wine Oxidation 2021 Access copy available to the general public Unrestricted 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. info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 5.895 2021 AGRICULTURE, MULTIDISCIPLINARY 6 / 60 = 0.1 2021 Q1 T1 FOOD SCIENCE & TECHNOLOGY 32 / 144 = 0.222 2021 Q1 T1 CHEMISTRY, APPLIED 14 / 73 = 0.192 2021 Q1 T1 1.018 2021 Chemistry (miscellaneous) 2021 Q1 Agricultural and Biological Sciences (miscellaneous) 2021 Q1 8.6 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Escudero, Ana Universidad de Zaragoza (orcid)0000-0003-1658-1770 Fernández-Zurbano, Purificación Ferreira, Vicente Universidad de Zaragoza (orcid)0000-0002-4353-2483 2009 750 Universidad de Zaragoza Dpto. Química Analítica Área Química Analítica 69 (2021), 15290-15300 J. agric. food chem. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 0021-8561 1573368 http://zaguan.unizar.es/record/121087/files/texto_completo.pdf Versión publicada 3230924 http://zaguan.unizar.es/record/121087/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:121087 articulos driver 2023-05-18-15:53:17 ARTICLE