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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Growth-associated production and characterization of poly (3-hydroxybutyric acid) of Azotobacter beijerinckii DAR-102.

Production of poly (3-hydroxybutyric acid) [P(3HB)] by Azotobacter beijerinckii DAR-102 isolated in this laboratory has been optimized under batch-culture. The accumulatad polymer attained 58% of cell dry mass during mid-stationary phase with an yield of 0.58 g/l when grown in nitrogen-free medium. The optimum concentration of glucose and fructose for P(3HB) production was 3% (w/v) and 2% (w/v) respectively while that of casamino acid and tryptose was 0.1% (w/v). Phosphate at a concentration suboptimal for growth and limitation of oxygen in the medium favoured P(3HB) accumulation. The production of P(3HB) was maximum with an inoculum dose of 4% (v/v). The accumulated polymer was isolated by direct chloroform extraction of the dry cell mass and purified by precipitation with diethyl ether. The purified polymer has been characterized in terms of its solubility properties, melting temperature, and UV-, IR- and NMR-spectroscopic analyses.[1]

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