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yeasts associated to malbec grape berries from mendoza, argentina.the aims of this work were to evaluate different pre-isolation treatments applied to complete yeast extraction from grapes and to identify the yeast microflora associated to malbec grapes from two vineyards located in mendoza, argentina.200515836474
ochratoxin a and ochratoxigenic aspergillus species in argentinean wine grapes cultivated under organic and non-organic systems.the evolution of contamination with aspergillus section nigri and ochratoxin a occurrence was evaluated in four vineyards located at mendoza province, argentina during 2003-2004. the survey included two grape varieties, one of late maturation (bonarda) and the other of early maturation (tempranillo). the vineyards were set under non-organic and organic cropping systems. bunches of grapes at different growth stages were collected, and berries (50 by sample) were plated on petri dishes containing ...200717196283
isolation and selection of yeasts from wine grape ecosystem secreting cold-active pectinolytic activity.the present study was undertaken with the purpose of selecting yeasts from wine grapes that are able to produce extracellular cold-active pectinases. after two consecutive selections yeast isolates were identified by pheno- and genotyping, and pectinolytic activity was preliminarily characterised at proximate winemaking conditions. out of 1023 indigenous microorganisms isolated from grape skins of d.o. san rafael (mendoza, argentina) viticulture region, 565 (55%) showed pectinolytic activity on ...201121529977
biodiversity of saccharomyces cerevisiae populations in malbec vineyards from the "zona alta del río mendoza" region in argentina.the "zona alta del río mendoza" (zarm) is the major malbec grape viticulture region of argentina. the aim of the present study was to explore saccharomyces cerevisiae biodiversity in zarm vineyards. interdelta pcr and rflp mtdna molecular markers were applied to differentiate s. cerevisiae strains. the presence of commercial strains on zarm vineyards was also assessed. our results reveal a highly diverse, but genetically closely related, s. cerevisiae population (containing more than 190 molecul ...201122056145
molecular relationships between saccharomyces cerevisiae strains involved in winemaking from mendoza, argentina.three molecular typing techniques were applied to assess the molecular relationships of saccharomyces cerevisiae strains isolated from winery equipment, grapes, and spontaneous fermentation in a cellar located in "zona alta del río mendoza" (argentina). in addition, commercial saccharomyces strains widely used in this region were also included. interdelta pcr typing, mtdna restriction analysis, and microsatellite (ssr) genotyping were applied. dendrograms were constructed based on similarity amo ...201020407774
diversity of saccharomyces strains on grapes and winery surfaces: analysis of their contribution to fermentative flora of malbec wine from mendoza (argentina) during two consecutive years.spontaneous fermentations are still conducted by several wineries in different regions of argentina as a common practice. native saccharomyces strains associated with winery equipment, grape and spontaneous fermentations of malbec musts from "zona alta del río mendoza" region (argentina) were investigated during 2001 and 2002 in the same cellar. low occurrence of saccharomyces on grapes and their limited participation during fermentation were confirmed. strain sequential substitution during ferm ...200717189766
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