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Phosphate feeding strategy during production phase improves poly(3-hydroxybutyrate-co-3-hydroxyvalerate) storage by
C R Squio1, C Marangoni, C S De Vecchi
1Chemical and Food Engineering Department, Technological Center, Federal University of Santa Catarina, C.P. 476, 88040-900, Florianópolis, Brazil.
Abstract:
The effect of a phosphate feeding strategy and the optimal rate of biomass production ( r(x)) during the production phase of P(3HB-co-3HV) in a 6-l fermentor were determined in cultures of Ralstonia eutropha with the goal of enhancing polymer productivity. Rates of biomass production ( r(x)) between 0.00 and 0.20 gx r l(-1) h(-1) were monitored during the production phase. When a low rate of cell growth was maintained ( r(x) of 0.02 gx r l(-1) h(-1)), polymer production improved, resulting in a final cell mass, P(3HB-co-3HV) mass, and P(3HB-co-3HV) content of 98.2 g, 62.0 g and 63.1 wt%, respectively, after 27.3 h. The maximum polymer productivity obtained during the production phase was 1.36 g l(-1 )h(-1).