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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 157 (1997), S. 0 
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: An enzyme with α-l-rhamnosidase activity was purified by anion exchange chromatography from an Aspergillus niger commercial preparation. The α-l-rhamnosidase was shown to be N-glycosylated, and had a molecular mass of 85 kD on sodium dodecylsulfate-polyacrylamide gel electrophoresis of which approximately 12% was contributed by carbohydrate. The enzyme was optimally active at pH 4.5 and 65°C. When tested towards p-nitrophenyl-α-l-rhamnopyranoside it showed Km and Vmax values of 2.9 mM and 20.6 U mg−1, respectively whereas it was inhibited competitively by l-rhamnose (Ki 3.5 mM). Substrate specificity studies showed α-l-rhamnosidase to be active both on α-1,2 and α-1,6 linkages to β-d-glucose. Moreover, the enzyme was able to release l-rhamnose from geranyl-β-d-rutinoside and 2-phenylethyl-β-d-rutinoside.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    International journal of food science & technology 35 (2000), S. 0 
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: β-D-glucosidase activity in 53 yeast strains belonging to the genera Candida, Dekkera, Hanseniaspora, Metschnikowia, Pichia, Rhodotorula, Schizosaccharomyces and Zygosaccharomyces, mainly isolated from grapes and wines, has been detected on the basis of its hydrolytic activity on 4-methylumbelliferyl-β-D-glucoside (MUG) and ρ-nitrophenyl-β-D-glucoside (pNPG). Only yeast species belonging to the genera Dekkera, Rhodotorula and Schizosaccharomyces did not produce the enzyme. The nine yeast strains demonstrating greatest β-D-glucosidase activity on pNPG at pH 3.5 in the presence of 10% (v/v) ethanol belong to the genera Candida, Hanseniaspora and Pichia and exhibited mainly cell wall bound activity. Anthocyanin-β-D-glucosidase activity was checked using an anthocyanin extract by following loss of absorbance at 520 nm. Whilst the nine yeast strains studied degraded the anthocyanin extract, H’spora osmophila 11207 and P. anomala 10590 were selected as the best producers of β-D-glucosidase with the lowest decolorizing activity.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0006-3592
    Keywords: Monte Carlo simulation ; depolymerization ; endo-enzymes ; single-attack mechanism ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A Monte Carlo simulation of the depolymerization of linear homopolymers by specific endo-enzymes exhibiting random-attack probability and a single-attack mechanism has been developed. The program simulates the “real” depolymerization versus time of a polydisperse sample of substrate by a specific endo-enzyme. Given the initial mass distribution and concentration of the substrate, the initial concentration of the enzyme, and its Michaelis-Menten constant, the program simulates the evolution of the mass distribution of the substrate with the depolymerization time. When tested against experimental data from the depolymerization of barley (1→3),(1→4)-β-D-glucan by malt endo-(1→3),(1→4)-β-D-glucanase, monitored using the Calcofluor-FIA method with fluorescent detection, excellent results were obtained. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 60: 105-113, 1998.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The pyrolysis/gas chromatography/mass spectrometry (PY/GC/MS) results after fungal treatment of paper-industry effluents suggested a decrease of the relative amounts of lignin pyrolysis products and of the syringyl/guaiacyl ratio, in addition to some oxidation rate of the C3-alkyl chain in lignin units. The results obtained pointed to the potential of PY/GC/MS for monitoring the extent of fungal modification of lignins by biological systems based on the use of Trametes versicolor.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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