Different soil types can significantly affect the composition of wine grapes and the final wine product. In this study, the effects of soil types on the composition of Cabernet Sauvignon grapes and wine produced in the Helan Mountains were evaluated. Three different representative soil types--aeolian, sierozem and irrigation silting soil were studied. The compositions of grapes and wines were m...

AIMS To identify ascomycetous yeasts recovered from sound and damaged grapes by the presence of honeydew or sour rot. METHODS AND RESULTS In sound grapes, the mean yeast counts ranged from 3.20 +/- 1.04 log CFU g(-1) to 5.87 +/- 0.64 log CFU g(-1). In honeydew grapes, the mean counts ranged from 3.88 +/- 0.80 log CFU g(-1) to 6.64 +/- 0.77 log CFU g(-1). In sour rot grapes counts varied betwe...

Tempranillo grapes were immersed in solutions of pyrimethanil, metalaxyl, dichlofluanid and penconazol fungicides at different concentrations for several different times. Determinations of the fungicide residues was carried out by GC-NPD, with an additional confirmation by GC-MS. The percentage absorption was determined as well as the distribution between surface, skin and pulp of the grapes. T...

What soils are best for grapes? The best grape soils are deep, well-drained loams, free from high concentrations of alkali, boron, or other toxic materials. Deeper soils produce the heaviest crops and are preferred for raisins, common wine grapes, and some varieties of table grapes. However, grapes are adapted to a wide variety of soil types and can be grown successfully on soils not suitable f...

Postharvest softening of grape berries is one of the main problems affecting grape quality during export. Cell wall disassembly, especially of pectin polysaccharides, has been commonly related to fruit softening, but its influence has been poorly studied in grapes during postharvest life. In order to better understand this process, the Thompson seedless (TS) variety, which has significantly dec...

In order to analyze and compare the phenolic characteristics of red wine grapes with diverse genetic backgrounds, skin phenolics among 21 different cultivars belonging to Vitis vinifera L., East Asian and North American Vitis species and hybrids, as well as 2 varieties of muscadine grapes were estimated by HPLC-MS/MS. There were 45 anthocyanins, 28 flavonols, 8 flavan-3-ols, 9 cinnamic acids, 5...

Deciding when to harvest the grapes is one of the most important choices that a winemaker or vineyard manager has to make. Sugar level in the grapes is often used as a maturity index, but sugar level at maturity is variable depending on the climate of the region where the grapes are grown and, therefore, is an inadequate indicator by itself. Others use the sugar to acid ratio or the color of th...

Microwave (MW) vacuum dehydration using temperature to control the level of MW power demonstrated potential in improving the performance of the process. Product surface temperature measured by an infrared temperature sensor was used to control MW power at any level between 0 and 3 kW. Multiple linear regression analysis indicated an r2 = 0.942 for prediction of final moisture content and r2 = 0...