Microwave maceration of pinot noir grape must: Sanitation and extraction effects and wine phenolics outcomes

Anna L Carew, Angela Sparrow, Chris Curtin, Dugald Close, Robert Dambergs

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Pinot noir grapes have a unique phenolic profile which can impinge on the extraction and stabilisation of compounds such as anthocyanins and tannins which con-tribute to the colour and mouthfeel of red wine. This study examined the concentration of phenolic compounds in Pinotnoir grape must and wine following application of a novel microwave maceration treatment for red grape must.Microwave maceration was shown to be highly effective for extraction of phenolics from grape solids into grape juice. When juices were fermented to wine, ultraviolet–visible spectrophotometry showed microwave maceration was associated with significantly higher concentrations of total phenolics, anthocyanin, tannin and pigmented tannin in wine at 18 months bottle age, compared with control wine.Mean tannin concentration in microwave treatment wine was 0.60 gm/L at 18 months, compared with 0.14 gm/L in control wine. The microwave treatment was also associated with a substantial and rapid decrease in the grape-associated yeast population, compared with control maceration, and a shorter lag phase at the outset of alcoholic fermentation.Based on this study, microwave maceration warrants further investigation as a potential industrial-scale application in red winemaking.
Original languageEnglish
Pages (from-to)954-963
Number of pages10
JournalFood and Bioprocess Technology
Volume7
DOIs
Publication statusPublished - 2014

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