title: Enhancement of cephalosporin C production by cultivation of Cephalosporium acremonium M25 using a mixture of inocula.
abstract: OBJECTIVE
  To enhance the productivity of Cephalosporin C (CPC) by cultivation of Cephalosporium acremonium M25 using a mixture of inocula.
  
  
  RESULTS
  Inoculum age was classified into three stages (early, intermediate and late) by image analysis. A mixture of inocula, according to the inoculum ages, was used for efficient production of CPC in the main culture. The most effective mixing ratio of inocula for CPC production in shake flasks was a 3 : 7 volume ratio of early- and late-stage inocula. This was also the case in a 1.5 l stirred-tank reactor. CPC productivity was enhanced by about 32% and 34% when using an inoculum mixture in the shake flask and 1.5 l stirred-tank reactor, respectively.
  
  
  CONCLUSIONS
  The morphological characteristics of C. acremonium M25 in the seed culture were quite different according to inoculum age. The compromise of different ages of inoculum showed better production of CPC.
  
  
  CONCLUSIONS
  The productivity of CPC was enhanced considerably when using mixed inocula. The results of this study can be applied to fungal cultures for efficient production of various metabolites.
authors: Department of Chemical Engineering, Korea University, Seoul, Korea Bioscience and Biotechnology, Korea-UK Co-operation Center, Cambridge, UK.
authors: M S
authors: MS
authors: Lee
authors: J S
authors: JS
authors: Lim
authors: C H
authors: CH
authors: Kim
authors: K K
authors: KK
authors: Oh
authors: D R
authors: DR
authors: Yang
authors: S W
authors: SW
authors: Kim
mesh_terms: D000164:Acremonium / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects; D018929:Cell Culture Techniques / Q000379:methods; D016922:Cellular Senescence / Q000502:physiology*; D002511:Cephalosporins / Q000096:biosynthesis*; D016296:Mutagenesis; D014466:Ultraviolet Rays
chemical_list: D002511:Cephalosporins; C025163:cephalosporin C