An alternate to sulphur dioxide natural antioxidant was tested during 2005 harvest on four different red
vinifications, and was applied in each winemaking batch in combination with sulphur dioxide and on its
own. Responses measured and analysed with uni- and multivariate statistics were: anthocyanin
content, antioxidant capacity and classic oenological parameters. ANOVA revealed no significant effect
of treatment in the antioxidant values of RA or diphenylpicrylhydrazyl (DPPH) of wines, but a paired
t-test could differentiate wines treated only with SO2 from those treated only with the novel product
according to their RA values. Principal component analysis (PCA) of anthocyanin content of the treated
wines gave five significant components, explaining 100% of variance and differentiating products
treated only with SO2 from those treated only with new product. PCA of oenological data explained 72%
of variance in the first two components and wines were clearly differentiated on the basis of SO2 or
alternative treatment. In all cases, commercially acceptable red wines were produced, giving a
possibility for partial substitution of SO2 by a natural product.
An alternate to sulphur dioxide natural antioxidant was tested during 2005 harvest on four different redvinifications, and was applied in each winemaking batch in combination with sulphur dioxide and on itsown. Responses measured and analysed with uni- and multivariate statistics were: anthocyanincontent, antioxidant capacity and classic oenological parameters. ANOVA revealed no significant effectof treatment in the antioxidant values of RA or diphenylpicrylhydrazyl (DPPH) of wines, but a pairedt-test could differentiate wines treated only with SO2 from those treated only with the novel productaccording to their RA values. Principal component analysis (PCA) of anthocyanin content of the treatedwines gave five significant components, explaining 100% of variance and differentiating productstreated only with SO2 from those treated only with new product. PCA of oenological data explained 72%of variance in the first two components and wines were clearly differentiated on the basis of SO2 oralternative treatment. In all cases, commercially acceptable red wines were produced, giving apossibility for partial substitution of SO2 by a natural product.
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