Characterization of macromolecular complexes in red wine: Composition, molecular mass distribution and particle size

Keren Bindon, Anna Carew, Angieszka Mierczynska-Vasilev, Stella Kassara, Fiona Kerslake, Paul Smith

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Precipitates were prepared from two compositionally different Pinot noir wines with addition of excess ethanol, and contained primarily polysaccharide, tannin and protein. The ethanol-soluble material was further fractionated into polymeric (tannin) and monomeric phenolics. Tannin associated with precipitates was of a higher molecular mass than that remaining in ethanolic solution. Wine fractions were reconstituted at the ratios of the original wine and analyzed using nanoparticle tracking analysis. The average particle size of the tannin fraction was 75-89 nm, and increased when combined with the precipitate (≅200 nm). Addition of the monomeric fraction to the tannin-precipitate complex increased both the incidence and concentration of smaller particles, reducing the average particle size. The formation of aggregates occurred in all fractions and only minor differences in particle size distribution were found between wines. Differences in particle concentration between wines appear to be due to differences in the total concentration of macromolecules rather than compositional differences.

    Original languageEnglish
    Pages (from-to)838-846
    Number of pages9
    JournalFood Chemistry
    Volume199
    DOIs
    Publication statusPublished - 15 May 2016

    Keywords

    • Maceration
    • Molecular mass
    • Nanoparticle tracking analysis
    • Particle size
    • Pinot noir
    • Polysaccharide
    • Proanthocyanidin
    • Protein
    • Size exclusion chromatography

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