Potentialul biotehnologic la producerea vinurilor ecologice roze in Moldova

Abstract

The regim of technological modes of jus “must” extraction from moldavian red sorts of grape in order to get pink color wine was studied. There have been elaborated new grapes selection for the preparation of dry pink wines, a range of important conditions for the batch, aswel as detected the technological schemes of processing the red grape sorts. Recommendations have been proposed related to the grape varieties used as wine raw materials in Moldova. It also enables to perform the main operation at the initial stages of wine making, crushed grapes maceration, in the regime, chosen according to the nomogram, that dependes on the contents of phenol complexes in the raw materials and the extraction temperature. The characteristic color features of the pink wines on the base of optic density in a 5-mm pot with light penetration 420, 520 and 620 nm (for Glories), was detected. The technology of selective thermo-processing, as well as, the production technology of specific wine coloring with dose up in fermentation vase of antocyanic extract were tested. The production of pink wines is in a growing also in the R.of Moldova, but the variable climate and less expensive technological schemes are applied because of variable climate and quality of raw materials. The new proposed technology provides the selective steam action at skin zone of whole grapes, where there are conglomerations of pigments and as a result the extraction – pressure is accelerated and the contamination of wine juice with wild micro flora is reduced at minimum. Through researches there has been identified the thermal regime of ten minutes at selective warming of skin with 62 %, the flesh representing only 47 oC, with 50 % extraction selection of antocyates, creating premises for energy consumption decrease. The new proposed installation VPG-50M has the goal of grape reception – thermal shock – condensation separation – pressure with – wine juice leaking – discharge, which give the possibility of simplificating of traditional line with four technical units.