RESEARCH ON CORRELATIONS BETWEEN THE QUALITY PARAMETERS OF SOME VARIETIES OF WHITE WINES OBTAINED AT THE OSTROV VINEYARD CENTER CULEA RODICA-ELENA*, TAMBA-BEREHOIU RADIANA*

Abstract

94 samples of white unbottled wine have been analyzed. The samples were derived from three varieties of grapes (White Feteasca, Blanc Sauvignon, Italian Riesling) grown in SC Ostrov S.A. The following quality parameters were determined for each sample: d 20 20 ,, alcohol (% vol), total dry extract (mg/l), free sugar (g/l), unreducing extract (g/l), total acidity (g/l C 4 H 6 O 6), free SO 2 (mg/l) and total SO 2 (mg/l). Statistical analysis showed that the best regressors for the studied white wines are the parameters Free sugar and Total dry extract. These regressors are involved in 2 of the 3 significant correlations between the quality parameters that are common to all analyzed varieties, namely: total dry extract-free sugar, total dry extract – unreducing extract and free sugar-alcohol content. For each of the three studied varieties we established a number of specific correlations. Thus, for the variety of White Feteasca wine, Total acidity was correlated with the Density parameter (r = 0.45 **), Total dry extract (r = 0.57 ***) and Dry unreducing extract (r = 0.49 **). For the wine of the Italian Riesling variety, Alcohol content was correlated with Total dry extract (r = 0.58 ***), with Unreducing extract (r = 0.47 **) and with Free sugar (r = 0.58 * **). The Blanc Sauvignon variety was characterized by correlations of the indices related to wine sulphitation, with other parameters. Thus, Free SO 2 correlated with the percentage of Alcohol (r = 0.38 *) and Total SO 2 with the Total dry extract (r = 0.82 ***) and with the Unreducing extract (r = 0.53 **).