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  • 1
    Electronic Resource
    Electronic Resource
    Studies on RTD and continuous culture (SCP) in cylindrical and tapered reactors (1991)
    Springer
    Bioprocess and biosystems engineering 7 (1991), S. 41-46 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The performance of a tapered reactor for the continuous cultivation of bakers' yeast (SCP) from cane molasses has been compared with that of a conventional cylindrical reactor. It is found that the tapered reactor has less non-idealities (bypass and deadspace). Using the experimentally evaluated bypass and deadspace values, a model for predicting conversions of substrate (cane molasses), based on the RTD model proposed by Cholette and Cloutier has been developed. The experimental substrate conversions are found to match the model satisfactorily.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383577
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Scale up studies for the production of biosurfactant in packed column bioreactor (2000)
    Springer
    Bioprocess engineering 22 (2000), S. 95-99 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Biosurfactants capable of emulsifying pesticides have great potential to assist in microbial degradation of the pesticides. Solid State Fermentation (SSF) due to several advantages, is one of the efficient ways of producing these surfactants and seldom receives attention for commercial exploitation. In this study, a packed column bioreactor with wheat bran as the raw material and Bacillus subtilis has been used to produce a biosurfactant specific to disperse Fenthion, an organophosphrous pesticide. The emulsifier activity (EA) and surface tension from the packed column bioreactor were compared with flask fermentation experiments, which served as control. Airflow rate in the packed column bioreactor was varied from 10–20 l/min. Maximum EA and minimum surface tension occurred at airflow rate of 20 l/min. Peak EA in the control was 1.2 at 29 h while it was 1.9 in the bioreactor. The least surface tension of 24 dynes/cm was noticed at 54 h in the bioreactor, which was 33% better than the control at the same time period. The results indicate that the packed column bioreactor can become a more acceptable solid state fermentation system for commercial exploitation of Fenthion specific biosurfactant production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004490050017
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A mathematical model for solid state fermentation in tray bioreactors (1993)
    Springer
    Bioprocess and biosystems engineering 8 (1993), S. 255-262 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A simple mathematical model for the interaction of mass transport with biochemical reaction in solid state fermentations (SSF) in static tray type bioreactors under isothermal conditions has been developed. The analysis has enabled scientific explanations to a number of practical observations, through the concept of critical substrate bed thickness. The model will be most useful in the prediction of the concentration gradients as also in efficient design of these bioreactors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369838
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Aqueous two-phase extraction coupled with ultrafiltration for purification of amyloglucosidase (2000)
    Springer
    Bioprocess engineering 23 (2000), S. 63-68 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Aqueous two phase extraction (ATPE) in combination with ultrafiltration was employed for concentration and purification of amyloglucosidase produced by solid state fermentation. After extraction (with water) from dry moldy bran the dilute enzyme extract was concentrated by ATPE in a polyethylene glycol (PEG)/maltodextrin (MDX) system. The enzyme in the top PEG rich phase was then extracted into a Na2HPO4 rich bottom phase and further concentrated by ultrafiltration. The partitioning behavior of amyloglucosidase was examined in PEG/MDX, PEG/Na2SO4, PEG/Na2HPO4, PEG/KH2PO4 aqueous two phase systems. Effect of buffering salts such as NaCl, Na2HPO4, KH2PO4 and Na2SO4 on the partitioning behavior of enzyme was studied in PEG/MDX system. Maximum partitioning of amyloglucosidase was seen with KH2PO4 (m = 18.1). A two stage ATPE employing PEG/MDX (buffered with KH2PO4) and PEG/Na2HPO4 systems, followed by ultrafiltration has resulted in an overall recovery of 78.4% with 3.1 fold purification and 9.4 fold concentration of the enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004499900123
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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