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Synthesis of polyhydroxyalkanoates from different short-chain fatty acids by mixed cultures submitted to aerobic dynamic feeding

Lemos, Paulo C. ; Serafim, Luísa S. ; Reis, Maria A.M.

Journal of biotechnology, 2006-03, Vol.122 (2), p.226-238 [Periódico revisado por pares]

Lausanne: Elsevier B.V

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Título:
Synthesis of polyhydroxyalkanoates from different short-chain fatty acids by mixed cultures submitted to aerobic dynamic feeding
Autor: Lemos, Paulo C. ; Serafim, Luísa S. ; Reis, Maria A.M.
Assuntos: Acetic Acid - metabolism ; Aerobic dynamic feeding ; Aerobiosis ; Bacteria, Aerobic - growth & development ; Bacteria, Aerobic - metabolism ; Biological and medical sciences ; Bioreactors - microbiology ; Biotechnology ; Coculture Techniques - methods ; Fatty Acids, Volatile - metabolism ; Fundamental and applied biological sciences. Psychology ; Hydroxybutyrates - metabolism ; Industrial Microbiology - methods ; Mixed cultures ; Polyhydroxyalkanoates ; Polymers - metabolism ; Propionates - metabolism ; Sewage - microbiology ; Short-chain fatty acids
É parte de: Journal of biotechnology, 2006-03, Vol.122 (2), p.226-238
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: The production of polyhydroxyalkanoates from acetate and propionate by two mixed cultures well adapted to each of these substrates was evaluated. Sludge fed with acetate (A), produced a homopolymer of hydroxybutyrate (HB), whereas sludge fed with propionate (P) produced a copolymer of HB and HV (hydoxyvalerate). Switching the substrate feeds, propionate to sludge A and acetate to culture P, a terpolymer of HB, HV and hydroxymethylvalerate (HMV) was obtained with culture A and a copolymer of P(HB/HV) by sludge P. Regardless of the population used, the polymer yield and productivity were much higher for acetate than for propionate. Feeding a mixture of acetate and propionate, in equal parts, to both cultures resulted in an increase of HV units produced per C mol of propionate consumed, relative to the situation where only propionate was used. The individual use of butyrate and valerate by culture A was also studied. Butyrate produced a homopolymer whereas valerate was stored as a terpolymer of P(HB/HV/HMV). The polymer yields on acetate and butyrate were higher than those on propionate and valerate. The polymer productivity was higher for acetate and propionate than for butyrate and valerate. Results showed that the polymer composition, and consequently the polymer properties, could be manipulated by varying the volatile fatty acid feed composition and/or the population.
Editor: Lausanne: Elsevier B.V
Idioma: Inglês

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Synthesis of polyhydroxyalkanoates from different short-chain fatty acids by mixed cultures submitted to aerobic dynamic feeding

Lemos, Paulo C. ; Serafim, Luísa S. ; Reis, Maria A.M.

Lausanne: Elsevier B.V

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