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Tailor-made biodegradable polymers produced ·by bacteria from biomass

Grant number: 12/51533-6
Support type:Program for Research on Bioenergy (BIOEN) - Regular Program Grants
Duration: July 01, 2013 - June 30, 2015
Field of knowledge:Biological Sciences - Microbiology - Applied Microbiology
Cooperation agreement: BE-BASIC Consortium
Principal researcher:Luiziana Ferreira da Silva
Grantee:Luiziana Ferreira da Silva
Principal researcher abroad: Kirsten Steinbusch
Institution abroad: Waste2Chemicals (W2C), Netherlands
Home Institution: Instituto de Ciências Biomédicas (ICB). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Recent papers and patents have shown that P(HB-co-HHx) is a promising biodegradable copolymer of the polyhydroxyalkanoate family (PHA), combining the short-chain (SC) monomer hydroxybutyrate (HB) and the medium-chain (MC) monomer hydroxyhexanoate (HHx), improving properties and applications, when compared with PHA with only SC or MC monomers. Since it can be processed into films, it is interesting to reduce its cost of production to make it a commodity. Aeromonas spp naturally produces a copolymer with 5-25 mol% HHx units, however only 10-20% of cell dry weight (CDW) is accumulated as PHA. B. sacchari accumulates up to 80% of CDW as PHB, but incorporates up to 2mol% HHx. Different strategies will be applied to produce P(HB-co-HHx) with variable HHx or MC monomer: construction of recombinants, metabolic flux and elementary mode analysis. HB fractions are obtained feeding bacteria with a sugar or sugarcane bagasse derivatives, however HHx incorporation depends on feeding with more scarce and expensive medium-chain fatty acid (MCFA). Raw material can represent up to 40% of costs of PHA production thus, finding cheaper and more sustainable alternatives is of high interest. It was found that MCFA could efficiently be produced with a mixed microbial fermentation (MMF) technology by anaerobic digestion, with the potential to transform acidified organic waste streams (acetic acid, ethanol etc.) into MCFA mixtures with a hexanoic acid yield of 0.85 mol C/mol C substrate in synthetic medium. MMF will be adapted to and optimized for a real feedstock (sugarcane bagasse and vinasse) to generate MCFA-containing streams appropriate to feed bacterial PHA production. This involves setting required effluent standards of MMF for the type and concentration of the fatty acids, or for other disturbing components (N or water content). Operation conditions and appropriate organic waste stream will be selected based on the requirements to feed PHA production. Starting from a single bacterial species, tailor-made copolymer will be produced, controlling monomer composition (MC monomer content from 0.5 to 25 mol% or more) from biomass, an approach not yet developed. Therefore the aim of this proposal is not merely incremental, having also the relevance of combining and improving two biological processes (MMF and PHA production) to contribute to sustainably produce an environmentally friendly material. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RADUAN ALEXANDRINO, PAULO MOISES; MENDONCA, THATIANE TEIXEIRA; GUAMAN BAUTISTA, LINDA PRISCILA; CHERIX, JULIANO; LOZANO-SAKALAUSKAS, GABRIELA CAZONATO; FUJITA, ANDRE; RAMOS FILHO, EDMAR; LONG, PAUL; PADILLA, GABRIEL; TACIRO, MARILDA KEICO; et al. Draft Genome Sequence of the Polyhydroxyalkanoate-Producing Bacterium Burkholderia sacchari LMG 19450 Isolated from Brazilian Sugarcane Plantation Soil. MICROBIOLOGY RESOURCE ANNOUNCEMENTS, v. 3, n. 3, . (10/51989-4, 12/51533-6)
OLIVEIRA-FILHO, EDMAR RAMOS; GUAMAN, LINDA P.; MENDONCA, THATIANE TEIXEIRA; LONG, PAUL F.; TACIRO, MARILDA KEICO; CABRERA GOMEZ, JOSE GREGORIO; SILVA, LUIZIANA F.. Production of Polyhydroxyalkanoates Copolymers by Recombinant Pseudomonas in Plasmid- and Antibiotic-Free Cultures. JOURNAL OF MOLECULAR MICROBIOLOGY AND BIOTECHNOLOGY, v. 28, n. 5, p. 225-235, . (12/51533-6, 10/51692-1, 14/15448-0)
MENDONCA, THATIANE T.; TAVARES, RAFAELA R.; CESPEDES, LUCAS G.; SANCHEZ-RODRIGUEZ, RUBEN J.; SCHRIPSEMA, JAN; TACIRO, MARILDA K.; GOMEZ, JOSE G. C.; SILVA, LUIZIANA F.. Combining molecular and bioprocess techniques to produce poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) with controlled monomer composition by Burkholderia sacchari. International Journal of Biological Macromolecules, v. 98, p. 654-663, . (12/51533-6)

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