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  • 1
    Electronic Resource
    Electronic Resource
    Solid-state fermentation for xylanase production by Thermoascus aurantiacus using response surface methodology (1999)
    Springer
    Applied microbiology and biotechnology 52 (1999), S. 768-772 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract We investigated xylanase production by Thermoascus aurantiacus using semisolid fermentation. Multivariant statistical approaches were employed to evaluate the effects of several variables (initial moisture in the medium, cultivation time, inoculum level, and bagasse mass) on xylanase production. The initial moisture content and bagasse mass were the most important factors affecting xylanase activity. The xylanase activity produced by the fungus under the optimized conditions (81% moisture content and 17 g bagasse) was found to be 2700 U per gram of initial dry matter, whereas its value predicted by a polynomial model was 2400 U per gram of initial dry matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051589
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of k L a on bioconversion of rice straw hemicellulose hydrolysate to xylitol (1999)
    Springer
    Bioprocess engineering 21 (1999), S. 505-508 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The effect of overall oxygen mass transfer coefficient (k L a) on the conversion of xylose to xylitol by Candida guilliermondii FTI 20037 was investigated in batch experiments. Rice straw hemicellulose hydrolysate obtained by acid hydrolysis was employed as a xylose-rich medium. The results showed that this bioconversion strongly depended on the aeration rate. The maximum volumetric productivity (0.52 g/l h−1) and the highest xylitol yield (0.73 g/g) were achieved at an overall oxygen mass transfer coefficient of 15 h−1. Under these conditions 80% efficiency in relation to theoretical yield was attained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009089
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of inoculum level on xylitol production from rice straw hemicellulose hydrolysate byCandida guilliermondii (1996)
    Springer
    Journal of industrial microbiology and biotechnology 16 (1996), S. 348-350 
    Details
    ISSN: 1476-5535
    Keywords: xylitol production ; inoculum level ; rice straw ; hemicellulose hydrolysate ; Candida guilliermondii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The effect of inoculum level on xylitol production byCandida guilliermondii was evaluated in a rice straw hemicellulose hydrolysate. High initial cell density did not show a positive effect in this bioconversion since increasing the initial cell density from 0.67 g L−1 to 2.41 g L−1 decreased both the rate of xylose utilization and xylitol accumulation. The maximum xylitol yield (0.71 g g−1) and volumetric productivity (0.56 g L−1 h−1) were reached with an inoculum level of 0.9 g L−1. These results show that under appropriate inoculum conditions rice straw hemicellulose hydrolysate can be converted into xylitol by the yeastC. guilliermondii with efficiency values as high as 77% of the theoretical maximum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570113
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Evaluation of rice straw hemicellulose hydrolysate in the production of xylitol byCandida guilliermondii (1994)
    Springer
    Biotechnology letters 16 (1994), S. 1211-1216 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Rice straw was used as a lignocellulosic source to provide rich pentose media. By using a well characterized yeast strain,Candida guilliermondii FTI 20037, the hydrolysate obtained was converted to xylitol with an efficiency of 75% and production of 27 g of xylitol per liter in 48 hours. The satisfactory results reported here can be attributed to the low concentrations of toxic components generated throughout the chemical depolymerization of this raw material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020853
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of media composition on xylitol fermentation by Candida guiliiermondii using response surface methodology (1995)
    Springer
    Biotechnology letters 17 (1995), S. 1223-1228 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The bioconversion of xylose to xylitol by the yeast Candida guilliermondii FTI 20037 was evaluated under different nutritional conditions using rice straw hemicellulose hydrolysate. Statistical designs were used to determine the fermentation medium composition. Ammonium sulfate and rice bran have been identified as required nutrients in the hydrolysate since there was a significant interaction between them. In the presence of both nutrients, the xylitol yield factor (Yp/s) and volumetric productivities (Qp) were 0.68 g/g and 0.54 g/L.h, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00128390
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    Paper (German National Licenses)
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