Search results for "Yeast assimilable nitrogen"

showing 3 items of 3 documents

Hierarchy of factors impacting grape berry mass: separation of direct and indirect effects on major berry metabolites

2018

Final berry mass, a major quality factor in wine production, is determined by the integrated effect of biotic and abiotic factors that can also influence berry composition. Under field conditions, interactions between these factors complicate study of the variability of berry mass and composition. Depending on the observation scale, the hierarchy of the impact degree of these factors can vary. The present work examines the simultaneous effects of the major factors influencing berry mass and composition to create a hierarchy by impact degree. A second objective was to separate the possible direct effects of factors on berry composition from an indirect effect mediated through their impact on…

0106 biological sciencesVineBerryHorticulture01 natural sciencesBerry seed040501 horticultureVeraisonchemistry.chemical_compoundSoilBotanySugarBerry maAbiotic componentYeast assimilable nitrogen (YAN)ViruBerry composition; Berry mass; Berry seed; Soil; Vine water status; Virus; Yeast assimilable nitrogen (YAN);food and beverages04 agricultural and veterinary sciences15. Life on landIndirect effectSettore AGR/03 - Arboricoltura Generale E Coltivazioni ArboreeHorticulturechemistryBerry compositionComposition (visual arts)Malic acidVine water statu0405 other agricultural sciences010606 plant biology & botanyFood Science
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2017

Nitrogen sources in the must are important for yeast metabolism, growth, and performance, and wine volatile compounds profile. Yeast assimilable nitrogen (YAN) deficiencies in grape must are one of the main causes of stuck and sluggish fermentation. The nitrogen requirement of Saccharomyces cerevisiae metabolism has been described in detail. However, the YAN preferences of non-Saccharomyces yeasts remain unknown despite their increasingly widespread use in winemaking. Furthermore, the impact of nitrogen consumption by non-Saccharomyces yeasts on YAN availability, alcoholic performance and volatile compounds production by S. cerevisiae in sequential fermentation has been little studied. With…

2. Zero hunger0301 basic medicineMicrobiology (medical)Fermentation in winemakingCo-fermentationbiologyChemistryPichia membranifaciensEthanol fermentationbiology.organism_classificationMicrobiologySaccharomyces03 medical and health sciences030104 developmental biologyFermentationFood scienceYeast assimilable nitrogenWinemakingFrontiers in Microbiology
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Sorption of wine volatile phenols by yeast lees

2005

The capacity of Saccharomyces cerevisiae yeast lees to sorb 4-ethylguaiacol and 4-ethylphenol was investigated in a synthetic medium and in wine. Active dried yeast was more effective when volatile phenols were diluted in red wine. Partition coefficients between wine model solution and wine yeast lees were determined and compared with those measured for dried active yeast. They showed a larger affinity of volatile phenols for wine yeast lees than for dried active yeast. The effect of yeast lees on volatile phenol sorption was sensitive to yeast autolysis level and to physicochemical parameters, such as ethanol content, temperature and pH. These results could be applied in the technology of …

WineChromatographyAutolysis (wine)Chemistrydigestive oral and skin physiologyfood and beveragesGeneral Medicine4-EthylguaiacolWine faultLeesAnalytical ChemistryYeast in winemakingchemistry.chemical_compoundMalolactic fermentationFood scienceFood ScienceYeast assimilable nitrogenFood Chemistry
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