Cesário, M. TeresaRaposo, Rodrigo S.Almeida, M. Catarina M. D. deVan Keulen, FrederikFerreira, Bruno S.Telo, João P.Fonseca, M. Manuela R. da2015-04-212015-04-212014-11Int J Biol Macromol. 2014 Nov;71:59-67. doi: 10.1016/j.ijbiomac.2014.04.0540141-8130http://hdl.handle.net/10400.26/8457“NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Biological Macromolecules. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Biological Macromolecules, Vol. 71, Special issue, (November 2014). DOI 10.1016/j.ijbiomac.2014.04.054 ""Burkholderia sacchari DSM 17165 is able to grow and produce poly(3-hydroxybutyrate) both on hexoses and pentoses. In a previous study, wheat straw lignocellulosic hydrolysates (WSH) containing high C6 and C5 sugar concentrations were shown to be excellent carbon sources for P(3HB) production. Using a similar feeding strategy developed for P(3HB) production based on WSH, fedbatch cultures were developed aiming at the production of the copolymer P(3HB-co- 4HB) (poly(3-hydroxybutyrate-co-4-hydroxybutyrate)) by B. sacchari. The ability of this strain to synthesize P(3HB-co-4HB) was first shown in shake flasks using gammabutyrolactone (GBL) as precursor of the 4HB units. Fed-batch cultures using glucose as carbon source (control) and GBL were developed to achieve high copolymer productivities and 4HB incorporations. The attained P(3HBco- 4HB) productivity and 4HB molar % were 0.7 g/(L·h) and 4.7 molar %, respectively. The 4HB incorporation was improved to 6.3 and 11.8 molar % by addition of 2 g/L propionic and acetic acid, respectively. When WSH were used as carbon source under the same feeding conditions, the values achieved were 0.5 g/(L·h) and 5.0 molar %, respectively. Burkholderia sacchari, a strain able to produce biopolymers based on xylose-rich lignocellulosic hydrolysates, is for the first time reported to produce P(3HB-co-4HB) using gamma butyrolactone as precursor."engBurkholderia sacchariPoly(3-hydroxybutyrate-co-4-hydroxybutyrate)Wheat straw lignocellulosic hydrolysatesjournal article10.1016/j.ijbiomac.2014.04.054