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• W3048321618 endingPage "461464" @default.
• W3048321618 startingPage "461464" @default.
• W3048321618 abstract "Red wine is a complex matrix containing macromolecules such as condensed tannins and polysaccharides. Wine macromolecular components and their interactions have been reported to impact taste properties such as astringency but the colloidal systems formed in wine are not well known. A key prerequisite to characterize these systems is the ability to work under analytical conditions as close as possible to the colloid environment, preserving the sample structure and limiting the denaturation of macromolecular complexes. A method of Asymmetric Flow Field-Flow Fractionation (AF4) coupled with UV detection, multi-angle light scattering (MALS), and differential refractometer index (dRI) (AF4-UV-MALS-dRI) has been developed to analyse macromolecules, including tannins and polysaccharides, and macromolecular complexes, in red wine. This method separates objects according to their hydrodynamic radius and does not require calibration to determine molecular weight (Mw). AF4 can provide native separation of wine colloidal matter while working with simulated wine as mobile phase. The channel was equipped with a 350-µm spacer and the membrane made in regenerated cellulose had a cut-off of 5kDa. Different parameters of crossflow rate were investigated using a generic red wine to optimize separation conditions. Then, purified fractions of polysaccharides and tannins were analysed using the selected AF4 parameters. The comparison of the peaks obtained for these fractions and for the wine sample allowed us to determine the retention time associated with these macromolecules. The AF4 fractogram of wine was divided into four fractions. The first three were assigned to higher Mw tannins coeluted with lower Mw polysaccharides such as rhamnogalacturonan II (F1), to intermediate Mw polysaccharides (F2), and to higher Mw mannoproteins (F3) whereas the last fraction (F4) was not identified. Furthermore, our results have shown that AF4-UV-MALS-dRI could be an efficient technique to separate large size tannins as well as polysaccharides and macromolecular complexes" @default.
• W3048321618 created "2020-08-13" @default.
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• W3048321618 date "2020-10-01" @default.
• W3048321618 modified "2023-10-16" @default.
• W3048321618 title "Fractionation and characterization of polyphenolic compounds and macromolecules in red wine by asymmetrical flow field-flow fractionation" @default.
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• W3048321618 doi "https://doi.org/10.1016/j.chroma.2020.461464" @default.
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