Sunlight exposure of winegrape clusters is frequently reported to increase C(13)-norisoprenoids in resulting wines, but the timing and mechanism of this influence is not well understood. Fruit zone leaf removal was applied to Vitis vinifera cv. Riesling at three timings: 2, 33 and 68 days past berry set (PBS), and compared to an untreated control. Free and total 1,1,6-trimethyl-1,2-dihydronapht...

The main source of ochratoxin A (OTA) in the wine food chain is the infection of grapes by "black aspergilli" in the field. OTA-producing black aspergilli include principally Aspergillus carbonarius, followed by A. niger and possibly A. tubingensis. They are opportunistic fungi that develop particularly on damaged berries at ripening, although they may occur and form OTA on grapes from veraison...

From 1990 through 1992, nematodes were extracted from soil samples taken from the rhizosphere of native species of grapes from four areas of northern California and two areas of southern California. For comparison, samples from domestic grapes as well as a putative hybrid of Vitis califarnica and V. vinifera were also taken. Rhizosoil from California native grapevine contained many more species...

The effect of irradiation through UV-C on the content phenolic compounds, antioxidant activity, color, and texture profile was evaluated in Bordô variety grapes. Grapes were subjected to stress by at time 0.5, 1.0, 4.0, 10 30 min that correspond doses 0.1, 0.3, 2.4, 7.2 kJ m-2, respectively. total anthocyanins content, color grapes after storage 22 ºC for 24 48 h. In general, samples irradiated...

Abstract Several studies have demonstrated that the application of ultrasounds to crushed grapes improves chromatic and sensory characteristics resulting wines by facilitating extractability compounds from must-wine. The objective this work was determine whether different maturity levels or sanitary status leads same positive outcome as regards characteristics, phenolic aroma well properties. r...

Experimental studies of the electrical conductivity whole berries, peels, and pulp apples grapes were carried out according to methods that measurement voltage should not exceed threshold time be minimal, mechanical damage cells during contact with electrodes was allowed. To study (electrical resistance) apples, grapes, their constituent elements, a device is developed represents three–electrod...