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  • 1
    Electronic Resource
    Electronic Resource
    TEMPO-oxidation of cellulose: Synthesis and characterisation of polyglucuronans (2000)
    Springer
    Cellulose 7 (2000), S. 177-188 
    Details
    ISSN: 1572-882X
    Keywords: cellulose ; dissolution ; selective TEMPO oxidation ; polyglucuronic acid ; NMR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A series of pseudo amorphous cellulose samples were reacted with catalytic amounts of 2,2,6,6-tetramethyl-1-piperidine oxoammonium salt (TEMPO), sodium hypochlorite and sodium bromide in water. In all samples the primary alcohol groups were selectively oxidised into carboxyl groups, and several water-soluble polyglucuronic acid sodium salts were obtained with different molecular weights. With this reaction system, the degradation of the amorphous cellulose samples may be minimized, provided the oxidation is performed at 4 °C and at constant pH 10, with controlled amounts of TEMPO and sodium hypochlorite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009276009711
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  • 2
    Electronic Resource
    Electronic Resource
    Saccharification of steam-exploded poplar wood (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 38 (1991), S. 1308-1317 
    Details
    ISSN: 0006-3592
    Keywords: Trichoderma reesei CL-847 ; steam explosion treatment ; saccharification ; inactivation ; cellulose ; hemicelluloses ; lignin ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Effects of time, temperature, and pH during the steam explosion of poplar wood were studied with the aim of optimize both pentoses recovery and enzymatic hydrolysis efficiency. Steam explosion of acid impregnated wood chips allowed the recovery of 70% of potential xylose as monomers (217°C, 120 s) Enzymatic hydrolysis of pretreated fiber with Trichoderma reesei CL-847 cellulase system increased progressively with the severity of the steam treatment conditions. The best yield in term of glucose recovery after 24 h of enzymatic hydrolysis was 70% of potential glucose (225°C, 120 s). Deactivation by adsorption on lignin of Trichoderma reesei cellulases and inhibition of these enzymes by low-molecular-weight phenols and trihydroxybutyric acids were noticed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260381108
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