2Institute of Chemistry, Chemical
Research Center, Hungarian Academy of Sciences, H-1525 Budapest, P. O. Box 17,
Hungary
Biogenic amines, polyphenols and resveratrol were
analysed quantitatively in 25 different Hungarian wines from the same
winemaking region, harvest of 1998. Polyphenols were determined by a
spectrophotometric method, whereas other substrates were analyzed using
overpressured-layer chromatography (OPLC).
Principal component analyses (PCA)
were performed on data matrices consisting of substrates (columns) and
different sorts of wines (rows) from the region of
Pécs (South Hungary).
It was found that four (unrotated) principal
components account for more than 80 % of the total variance in the data. The
plots of component loadings showed significant groupings for concentrations of
biogenic amines (and polyphenols). Similarly the component scores grouped
according to the different sorts of wines.
The loading plots reveal that there is no need
to measure all the variables to achieve the same characterization. It is enough
to measure one variable per group. Naturally, this conclusion is only valid
within the limits of the present study; wines from other regions may behave
differently.