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• W2035392397 abstract "Microbial production of medium-chain-length poly(3-hydroxyalkanoates), PHAMCL from crude fatty acids mixture was investigated. With ammonium as the growth limiting substrate, fatty acids mixture from saponified palm kernel oil (SPKO) supports good growth and PHAMCL production of Pseudomonas putida PGA1. Growth of this microorganism on ammonium exhibited substrate inhibition kinetics which can be described using Andrews model with the substrate inhibition constant, Ki = 1.2 g L−1. Concentration of SPKO in the aqueous medium should be at 10 g L−1 or less, as higher concentrations can significantly reduced the volumetric oxygen transfer coefficient (KLa), biomass growth and PHAMCL production. Uptake of SPKO by the organism follows a zero-order kinetics, indicating a mass transfer limitation of the free fatty acids by the P. putida PGA1 cells. In batch and fed-batch fermentations, PHAMCL accumulation is encouraged under ammonium-limited condition with SPKO as the sole carbon and energy source. The amount of PHAMCL accumulated and its specific production rate, qPHA were influenced by the residual ammonium concentration level in the culture medium. It was observed that in both fermentation modes, when the residual ammonium becomes exhausted (<0.05 g L−1), the PHAMCL accumulation and qPHA were significantly reduced. However, this effect can be reversed by feeding low amount of ammonium to the culture, resulting in significantly improved PHAMCL yield and productivity. It is concluded that the feeding of residual ammonium concentration in the culture medium during the PHAMCL accumulation has a positive effect on sustaining the PHAMCL biosynthetic capability of the organism." @default.
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• W2035392397 date "2007-06-01" @default.
• W2035392397 modified "2023-10-17" @default.
• W2035392397 title "Production of Medium-Chain-Length Poly(3-hydroxyalkanoates) from Crude Fatty Acids Mixture by Pseudomonas putida" @default.
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• W2035392397 doi "https://doi.org/10.1205/fbp06017" @default.
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