Showing papers on "Arabitol published in 1991"
TL;DR: The Candida guillermondii strain did not convert glucose, mannose and galactose into their corresponding polyols but only into ethanol and cell mass and fermentation of arabinose lead to the formation of arabitol.
Abstract: The ability ofCandida guillermondii to produce xylitol from xylose and to ferment individual non xylose hemicellulosic derived sugars was investigated in microaerobic conditions. Xylose was converted into xylitol with a yield of 0,63 g/g and ethanol was produced in negligible amounts. The strain did not convert glucose, mannose and galactose into their corresponding polyols but only into ethanol and cell mass. By contrast, fermentation of arabinose lead to the formation of arabitol. On D-xylose medium,Candida guillermondii exhibited high yield and rate of xylitol production when the initial sugar concentration exceeded 110 g/l. A final xylitol concentration of 221 g/l was obtained from 300 g/l D-xylose with a yield of 82,6% of theoretical and an average specific rate of 0,19 g/g.h.
126 citations
TL;DR: The polyols ofN.
24 citations
TL;DR: Analysis of seventeen yeast strains by 13C-NMR spectroscopy has confirmed the significance of glycerol as the sole osmoregulatory solute under salt-stressed conditions, and has shown arabitol to be present in most of the osmotolerant species.
Abstract: Analysis of seventeen yeast strains by 13C-NMR spectroscopy has confirmed the significance of glycerol as the sole osmoregulatory solute under salt-stressed conditions, and has shown arabitol to be present in most of the osmotolerant species. Ribitol was detected in some species, including Debaryomyces hansenii, although ribitol accumulation did not correlate with the osmotic pressure of the medium. Relative amounts of arabitol and ribitol decreased in relation to glycerol when the external osmotic pressure was increased. Trehalose was present during exponential growth of some species.
24 citations
TL;DR: Enzymes that catalyse steps of the pentosephosphate pathway showed a distinct increase after transfer of the cells into production medium, and only alcohol dehydrogenase presented the inter-lag phase.
Abstract: Some physiological data of cells of Pichia farinosa immobilized on sintered glass Raschig rings were compared with data from free cells. Glucose consumption and productivity of total polyols (arabitol, glycerol and erythritol) showed a simultaneous “inter-lag” phase. Enzymes that catalyse steps of the pentosephosphate pathway (glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, transaldolase and polyol dehydrogenase) showed a distinct increase after transfer of the cells into production medium. The activity of glycerol-3-phosphate dehydrogenase was generally low. Only alcohol dehydrogenase presented the inter-lag phase mentioned above.
16 citations
TL;DR: In this article, the aldol reaction of lithium enolates of tetronates with (R)-2,3-O-cyclohexylideneglyceraldehyde afforded the chelation controlled products stereoselectively.
Abstract: The aldol reaction of lithium enolates of tetronates with (R)-2,3-O-cyclohexylideneglyceraldehyde afforded the chelation controlled products stereoselectively. The conversion of the aldol products into arabitol and ribitol was also described.
2 citations
TL;DR: In this article, the metabolism of resting cells of Candida albicans was studied by 13 C NMR spectrometry using 13 C-labeled glucose, and the formation of ethanol, glycerol, arabitol, mannitol, and trehalose was observed.
1 citations
01 Jan 1991
TL;DR: Growth of the marine yeast Debaryomyces hansenii in continuous culture suggests that polyols as well as producing compatible osmotic ballast are also, through their metabolism, involved in energy dissipation via futile cycles under conditions when growth becomes limited by conditions other than carbon supply.
Abstract: The filamentous Hyphomycete Dendryphiella salina is the most extensively studied marine fungus It has been shown by radiotracer flux analysis and X-ray microanalysis that the cytoplasmic concentrations of K, Na and Cl in mycelium gowing in 500 mM NaCl is of the order of 51–88, 74–139 and 160 mM respectively There appears to be no accumulation of salt in vacuoles In vivo studies of the effect of K and NaCl on enzymes are in keeping with the above values Polyols make a major contribution to the osmotic ballast The total concentration at any one external water potential is relatively constant However the proportions of the four individual polyols, glycerol, erythritol, arabitol and mannitol may differ according to the solute generating the water potential Growth of the marine yeast Debaryomyces hansenii in continuous culture suggests that polyols as well as producing compatible osmotic ballast are also, through their metabolism, involved in energy dissipation via futile cycles under conditions when growth becomes limited by conditions other than carbon supply Primary and secondary transport in marine fungi is proton-and not sodium-based but a large volume cell wall may be involved in maintaining the appropriate proton electrochemical potential gradient