Impact of a double post-fermentative maceration with ripe and overripe seeds on the phenolic composition and color stability of Syrah red wines from warm climate. (1st June 2021)

• Record Type: Journal Article
• Authors: Gordillo, Belén; Rivero, Francisco J.; Jara-Palacios, M. José; González-Miret, M. Lourdes; Heredia, Francisco J.
• Is Part Of: Food chemistry. Volume 346(2021)
• Publication Date: 2021-06-01
• Subjects: Sun-dried grapes -- Overripe seeds -- Phenolic composition -- Red wine color -- Post-fermentative maceration; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2020.128919
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Study considers natural and off-vine matured seeds as sources of copigments. Adding seeds leads to increase phenolic composition and improve wine color. Adding overripe-seeds exerts higher quality and stability of color than ripe-seeds. In addition, the improving effect of overripe seeds kept longer over the time. Abstract: The post-fermentative double addition of Pedro Ximénez cv seeds obtained from natural matured grapes (ripe seeds, RS) and postharvest sun-dried grapes (overripe seeds, OS) were studied as sustainable enological alternatives to conventional vinification (CW) to improve the stability of Syrah wines produced in a warm climate. The phenolic composition was assessed by rapid resolution liquid chromatography, copigmentation/polymerization processes by spectrophotometry, and color quality and stability by Differential Colorimetry. OSW and RSW wines enriched their total phenolic content, being the effect more pronounced with overripe seeds (by 23% versus 10%). OSW differences were found for gallic acid, monomeric flavan-3-ols, and procyanidins compared to CW, and for (+)-catechin, procyanidin B2-3- O -gallate and the tetramer to RSW. Phenolic changes were related to higher color intensity in seed-added wines. OSW having higher percentage of polymeric pigments maintained for longer time the chromatic improvement, being visually darker and more intense than final CW and RSW.