[When malolactic fermentation has starting difficulties [starter cultures]]

acide malique acidez acidity acido malico analyse organoleptique biocatalizador biocatalizzatori biocatalyseur biocatalysts colture starter cultivos iniciadores culture starter diacetile diacetilo diacetyl enologia fermentation malolactique fermentazione malolattica glicerol glicerolo glycerol lactic acid bacteria malic acid malolactic fermentation metodi di prova oenologie oenology organoleptic analysis starter cultures trial methods vin vini vinification vinificazione vinos winemaking wines