Expertise documents

expertise_documents

ESL 2020 : Biological tools in winemaking adapting to a changing environment

The proceedings from the 2019 Entretiens Scientifiques Lallemand held in Weisbaden Germany are now available. the 2019 international meeting focused on different strategies to overcome some of the issues related to climate change. From the vineyards with Lalvigne foliar sprays to managing acidity with non-Saccharomyces yeast, to nutrition and oxidation management. Special guests from the Geisenheim Institute , Prof Manfred Grossman and Prof J. Wendland presented the latest work from the Institute. The Entretiens had the privilege of hosting Prof Monika Christmann from Geisenheim University and the OIV 1st Vice-President as the key note speaker. ESL 2019 eversion

Optimal wine yeast nutrition with Stimula Chardonnay™ for maximum aromatic expression in Chardonnay wines

Wine yeasts are able to produce volatile aroma compounds from precursors found in the grape musts. Despite this ability, the wine yeast needs an adapted nutrition management (type of nutrient and timing of addition) that will maximize this secondary metabolism. Work done in collaboration with INRA (Montpellier, France) has shown that the type of nutrient, and the timing of addition during alcoholic fermentation has an important impact on the production of fermentative aroma compounds. Stimula Chardonnay™ has been shown to maximize specific aroma compounds in Chardonnay wines UI Stimula Chardonnay 2019 - ENG  

The many roles of nitrogen in alcoholic fermentation

Wine yeast requires certain essential elements to transform must into wine:  sugars, vitamins and minerals, some oxygen, and also very importantly, a sufficient concentration of Yeast Asssimilable Nitrogen. This type of nitrogen (YAN) is composed of amino acids, some small peptides and ammonium that can be used by yeast cells to not only complete fermentation, but also to fully develop the sensory profile of the wine.  Many wine musts are deficient in nitrogen and the type of nutrient used and the timing of addition is crucial in the development of AF. It has been shown that organic nutrients, which N-containing amino acids, peptides and proteins issued from auto-lysed yeast cells found in Fermaid O™ for example, and added at the beginning of fermentation and at 1/3 through the AF, are the best strategy for achieving complete and regular AF and maximizing the sensory potential of the wine. For full article click here WE#8 Nitrogen

Complete Yeast Nutrition – State of the Art Booklet

The purpose of this booklet is to provide oenologists and winemakers with an outline of the current scientific understanding of yeast nutrition and protection for reliable alcoholic fermentation management. Download PDF