Natural Abundance Isotopic Fractionation in the Fermentation Reaction: Influence of the Nature of the Yeast

Conversions of olive mill wastewater‐based media by Saccharomyces cerevisiae through sterile and non‐sterile bioprocesses

“…Yeasts are the most common microorganisms for the biotechnological production of ethanol. Among them, numerous S. cerevisiae strains have been widely used and reported in literature for the production of high ethanol concentrations when cultivated in various substrates including wastes or low‐cost materials like crude molasses (contaminated with fungicides) grape musts, flour hydrolysates, sorghum stalks, etc …”

Site-Specific Hydrogen Isotope Fractionation in the Biosynthesis of Glycerol

“…These proportions may depend to some extent on the experimental conditions of the reaction. In this respect the SNIF-NMR method is expected to provide an efficient source of information on the overall participations of intra-and intermolecular transfers in biosyntheses carried out with different microorganisms and in different media (14,22,23).…”

Natural Abundance Isotopic Fractionation in the Fermentation Reaction: Influence of the Fermentation Medium

“…In fact, due to intermolecular exchange of some hydrogens of the carbohydrate skeleton with the aqueous medium at several steps of the bioconversion (4-6), many factors are likely to exert an influence on the relative percentages of intra-and intermolecular transfers and on the related kinetic isotope effects. In a previous paper we have examined the role of the nature of the yeast and of the initial concentration of sugars (7). We have shown that, provided that the yield of the bioconversion is sufficiently high, different yeast species lead to very close values of the isotopic ratio of the methyl site of ethanol, (D/H) I .…”