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South African
Wine Lab Association:

The Importance of Monomeric Anthocyanins in the Definition of Wine Colour Properties

K. Tang1,2, T. Liu1,2, Y. Han1,2, Y. Xu1,2*, J.M. Li3

Monomeric anthocyanins are the main contributor of colour in young red wines. To study the importance
of monomeric anthocyanins to the wine colour, 41 wines of Vitis vinifera L. Cabernet Sauvignon, Cabernet
Gernischt and Merlot were examined. Seven monomeric anthocyanins were isolated and applied as
standards in HPLC analysis. Multiple linear regression (MLR) and partial least squares regression (PLSR)
were performed to relate and validate the correlations between the monomeric anthocyanins and CIELab
colour parameters. Malvidin-3-O-glucoside (Mv3g) was the most abundant anthocyanin in all tested wines,
but not the anthocyanin that showed the highest correlation with the colour parameters evaluated. L*, b*
and h were shown to be correlated significantly with mainly the anthocyanins for Cabernet Sauvignon,
L* with the anthocyanins for Cabernet Gernischt and h with the anthocyanins for Merlot. MLR and
PLSR both successfully predicted the colour from the anthocyanin composition of the wine. Delphinidin-
3-glucoside (Dp3g), malvidin-3-O-acetylglucoside (Mv3ac) and Dp3g were the most important monomeric
anthocyanins contributing to the prediction of the wine colour of Cabernet Sauvignon, Cabernet Gernischt
and Merlot respectively. Different grape varieties had profound influences on the correlation of wine colour
with anthocyanin composition.

Wine analysis, wine composition, monomeric anthocyanins, CIELab colour parameters, young red wines, multiple linear regression, partial least squares regression

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