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The effect of prolonged (150 days) post-fermentative maceration in steel tanks and oak barrels on Cabernet Sauvignon wine quality: mathematical modelization of the phenolic compounds’ behaviour

ABSTRACT The aim of this study was to evaluate the effects of the prolonged post-fermentative maceration during the winemaking of Cabernet Sauvignon grapes in oak barrels and steel tanks and apply to this purpose a mathematical modelization to better and easily understand the dynamics and phenomena related to this process. The study focused on the time series of phenolic and volatile compounds in wines during the maceration with solid parts and residual components of the alcoholic fermentation, only for anthocyanins and non-anthocyanin flavonoids two mathematical models were proposed. The results showed that solid parts during the post-fermentative maceration phase provided a higher content of polyphenols and total flavonoids in oak barrels and steel tanks. The largest contents of polyphenols and flavonoids were observed in oak barrel trials. Among the anthocyanins in both trials, we have assisted in a decreasing trend in delphinidin-3 glucoside, cyanidin-3-glucoside, petunidin-3-glucoside and peonidin-3-glucoside, with a more accentuated process for the first two molecules in a barrique trial, also acetylated anthocyanins showed a decreasing trend more intense in the barrique trial. Post-fermentative maceration improved the sensory characteristics in terms of intensity, complexity, and persistence at both olfactory and gustatory levels, especially in oak barrel vinification.

An exploration of consumer perceptions of sustainable wine

ABSTRACT Despite increasing interest in the category, there has been limited consumer-focused research to date around sustainable wines, especially in the Canadian context, despite the importance of consumer perceptions in driving wine purchase behaviour. In this mixed methods online survey of Canadian wine consumers (n = 725), we sought to determine how important sustainability-related cues are in purchase decisions, what beliefs and knowledge consumers possess around sustainable wines, and what are the characteristics of consumers with low and high sustainable wine involvement. Results show that sustainability-related cues are somewhat valued by consumers when making purchase decisions, but have low importance relative to the other cues examined. Environmental dimensions of sustainability have high saliency, in contrast with social and economic dimensions, and a significant minority of respondents report no or very limited knowledge of sustainable wines. Additionally, consumers with high involvement in sustainable wines tend to be younger, better educated, more involved in wine in general, and spend more per bottle than those with low involvement. Our findings support initiatives to develop global frameworks around sustainable wine and educate consumers on sustainable wine practises, as well as offer insights into marketing opportunities to promote this important product category.