Production of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) by Burkholderia sacchari using wheat straw hydrolysates and gamma-butyrolactone

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, fed-batch 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 gamma-butyrolactone (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(3HB- co-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.