Comparison of extraction protocols to determine differences in wine-extractable tannin and anthocyanin in Vitis vinifera L. cv. Shiraz and Cabernet Sauvignon grapes

Keren Bindon, Stella Kassara, Wieslawa Cynkar, Ella Robinson, Neil Scrimgeour, Paul Smith

    Research output: Contribution to journalArticlepeer-review

    29 Citations (Scopus)

    Abstract

    Cabernet Sauvignon and Shiraz grapes were sourced from different regions within Australia, and microvinified with a skin contact period of 6 days. Grape samples were extracted using two protocols: a 15% v/v ethanol, 10 g/L tartaric acid extract of gently crushed berries (wine-like, WL) and a 50% v/v ethanol, pH 2 extract of grape berry homogenate. It was found that in WL extracts, grape tannin and anthocyanin concentrations were strongly related to wine tannin, anthocyanin and color density achieved during the skin contact period. No relationship was observed for grape tannin concentration analyzed in homogenate extracts and wine tannin, but a strong, positive relationship was found for anthocyanin concentration. When the data obtained from homogenate extraction was treated separately by grape variety, a stronger relationship between grape and wine tannin concentration was observed. Tannin compositional analysis in wines indicated that higher tannin concentrations were due to the extraction of tannin of higher molecular mass during fermentation, most likely from grape skins.

    Original languageEnglish
    Pages (from-to)4558-4570
    Number of pages13
    JournalJournal of Agricultural and Food Chemistry
    Volume62
    Issue number20
    DOIs
    Publication statusPublished - 2014

    Keywords

    • (-)-epicatechin-3- O -gallate
    • (-)-epigallocatechin
    • anthocyanin
    • color
    • extractability
    • grape
    • methyl cellulose
    • molecular mass
    • phloroglucinolysis
    • prodelphinidin
    • tannin
    • wine

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