Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 36, Issue 9, Pages 1267-1275Publisher
SPRINGER
DOI: 10.1007/s00449-012-0871-5
Keywords
Pichia pastoris; Increased air pressure; Oxygen transfer rate (OTR); Crude glycerol
Funding
- Fundacao para a Ciencia e Tecnologia [SFRH/BD/47371/2008]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/47371/2008] Funding Source: FCT
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Pichia pastoris CBS 2612 behavior under air pressures of 1, 3 and 5 bar in culture media of glycerol (pure and crude) and methanol was studied. Generally, the increase in oxygen transfer rate due to the increase of total pressure improved cellular growth for all carbon sources and for batch and fed-batch processes with different feeding rate strategies. In batch cultures, 1.4-, 1.2-, and 1.5-fold improvement in biomass production was obtained with the increase of air pressure up to 5 bar, using methanol, pure glycerol, and crude glycerol, respectively. The increase of air pressure to 5 bar using exponential feeding rate led to 1.4-fold improvement in biomass yield per glycerol mass consumed, for crude and pure glycerol. The current low cost of crude glycerol from the biodiesel production together with the present results shows the possibility of improving cell mass production of P. pastoris using increased air pressure.
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