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1990 (1)
1987 (1)
1Author    H. Eikmeier, H. J. RehmRequires cookie*
 Title    Semicontinuous and Continuous Production of Citric Acid with Immobilized Cells of Aspergillus niger  
 Abstract    The citric acid excretion of Ca-alginate-immobilized cells of Aspergillus niger in batch culture decreased with a half-time of approximately 19 days. Reactivation of the biocatalysts by regenera­ tion in growth medium was possible, but it was followed by a submerged sporulation of the fungus, and medium was highly contaminated with free cells. Citric acid production could better be prolonged by semicontinuous cultivation with medium exchange every 7 or 14 days, respective­ ly. After 32 days the remaining activity in semicontinuous culture was 1.4-fold higher than in comparable batch experiments. Similar improvements were obtained with a continuous process at a dilution rate of 0.125 v/v • d, whereby medium efflux 
  Reference    Z. Naturforsch. 42c, 408—413 (1987); received October 1 1986 
  Published    1987 
  Keywords    Aspergillus niger, Immobilized Cells, Citric Acid, Semicontinuous, Continuous 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-0408.pdf 
 Identifier    ZNC-1987-42c-0408 
 Volume    42 
2Author    A. A. Gbolade, G. B. LockwoodRequires cookie*
 Title    Biotransformation of Monoterpenes by Polyurethane Foam-Immobilized Cells of Petroselinum crispum (Mill) Nyman  
 Abstract    Cells o f Petroselinum crispum cv. "Paramount" and "Plain-leaved" immobilized in polyure­ thane foam retained the biotransformational characteristics o f their freely suspended cells for certain monoterpenic substrates. Immobilized cells o f both cultivars were more efficient than their free cells in isomerizing geraniol into nerol, but less efficient (< 60%) in reducing the alde­ hydes, citral and citronellal. M aintenance o f the immobilized cells under the condition o f growth limitation did not enhance the efficiency o f the biochemical reactions. Under the same condition, the freely suspended cells o f cult. "Paramount" exhibited higher efficiency (up to 1.6 times) o f biotransformation o f citral when compared to those in sucrose-supplemented me­ dia. This investigation lends support to the view that the biochemical productivity o f cultured plant cells for especially monoterpenoids may not necessarily be improved upon immobiliza­ tion. 
  Reference    Z. Naturforsch. 45c, 245 (1990); received N ovem ber 24 1989 
  Published    1990 
  Keywords    Petroselinum, Biotransformation, Immobilized Cells, M onoterpenes, Polyurethane Foam 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0245.pdf 
 Identifier    ZNC-1990-45c-0245 
 Volume    45