Phenolic natural products of the wines obtained from three new Merlot clone candidates

Abstract

This work aimed to evaluate the total contents of polyphenolics (the Ribereau-Gayon-Maurie procedure), anthocyanins (using pH differential method) and tannins (the Negre procedure) as well as the content of phenolic acids (using UPLC/MS chromatography), respectively of the wines obtained from three new Merlot clone candidates in the perennial clonal selection. The aforementioned chemical parameters were determined in the samples covering the period 2009-2012. In comparison both with the standard Merlot wine (mother vine) and the wines obtained from other two clone candidates, the Merlot wine of the clone candidate No. 022 was found to have the highest total content of all three examined components 1.89 +/- 0.05g/L (polyphenolics), 185.59 +/- 5.00mg/L (anthocyanins) and 1.11 +/- 0.03g/L (tannins), as well as six phenolic acids including gallic acid (25.49 +/- 0.27mg/L). These findings are in good agreement with the observed trend for the viticultural parameters indicating the clone candidate No. 022 as more promising than mother.