NDLI: Growth-associated production of poly(hydroxybutyric acid) by Azotobacter beijerinckii from organic nitrogen substrates

Content Provider	Springer Nature Link
Author	Bormann, E. J. Leißner, M. Beer, B.
Copyright Year	1998
Abstract	Poly(hydroxybutyric acid) (PHB) was produced by a selectant of Azotobacter beijerinckii in media containing only organic nitrogen sources such as N substrates. The chosen compounds were casein peptone, yeast extract, casamino acids and urea, each combined with carbon substrates glucose or sucrose. The PHB was synthesized under growth-associated conditions. The concentrations amounted to more than 50% of cell dry mass on casein peptone/glucose as well as urea/glucose medium within 45 h fermentation time. Corresponding to these yields, productivities of about 0.8 g PHB l−1 h−1 were discovered. The highest values increased to 1.06 g PHB l−1 h−1 on casein peptone/glucose medium and 1.1 g PHB l−1 h−1 on yeast extract/glucose medium after a period of 20 h. It was found that oxygen limitation was essential for successful product formation, as demonstrated earlier. These data from basic research may support further investigations into the use of technical proteins from renewable sources as substrates for PHB production by a strain of A. beijerinckii.
Starting Page	84
Ending Page	88
Page Count	5
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	49
Issue Number	1
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-01-26
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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