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Results for “rehydration”
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The use of dried yeast without rehydration
Since the production and availability of active dried wine yeast in South Africa commenced in the seventies, the use of pure culture yeast has undergone a major change. The change from the laborious multiplication of wet yeast cultures to dried yeast had enormous advantages.
By Charl Theron · 3 min read
New tools to help overcome stuck fermentations in wine
Twenty years ago, it was thought that stuck fermentations were mainly due to two things: nitrogen deficiency and the glucose/fructose ratio of the must. Recentl
By Lallemand · 16 min read
Feedback from the 11th International Workshop on Grapevine Trunk Diseases
The 11th International Workshop on Grapevine Trunk Diseases (IWGTD) was held in Penticton, British Columbia, Canada. This workshop hallmarked 20 years of resear
By Lizel Mostert and Francois Halleen · 11 min read
Bioprotection – a microbial alternative to SO2
Healthy grapes have a complex microbial ecology including filamentous fungi, yeasts and bacteria. The variety and population of microorganisms present on the grape surface will depend on many factors. However, high sugar concentrations on the berry surface of damaged grapes will especially favour…
By Morné Kemp · 7 min read
Lipids in white winemaking - the too oft-ignored essential nutrients
It is important for winemakers to understand the factors contributing to lipid deficiency in grape juice and solutions to circumvent this.
By Lethiwe Mbuyane, James Duncan & Benoit Divol · 8 min read
Micro agglomeration and bioavailability of sterols - the revolutionary wine yeast protector
Specific research has focused on how sterols influence yeast’s physiological state and metabolism and how it was directly correlated with a secure end of fermentation.
By Lallemand · 11 min read
Factors that affect alcoholic fermentation
The alcoholic fermentation of grape juice is affected by the yeast strain, sugar concentration, alcohol concentration, fermentation temperature, presence of oxygen, concentration of assimilable nitrogen, vitamins and minerals, survival factors, preservatives, carbon dioxide and volatile acidity.
By Charl Theron · 7 min read
Bioprotection as an alternative to sulphur dioxide in the pre-fermentation phase
There has been recent research on bioprotection as an alternative to sulphite addition in the pre-fermentation phase. This technical article discusses the many advantages of using bioprotection agents.
By Sara Windholtz & other authors · 8 min read
Yeast cell density and the effect on volatile thiol formation
A recent study investigated the effect of varying the yeast population at the time of inoculation and how it affects the overall fermentation with a special focus on the formation and release of volatile thiols.
By Carien Coetzee · 5 min read
Tips for additions
Several guidelines have to be followed to ensure that additives and processing aids are correctly added to grapes, juice, fermenting must and wine, in order for these products to work optimally.
By Pieter Badenhorst · 7 min read
