title: Factors affecting poly(3-hydroxybutyrate) production from oil palm frond juice by Cupriavidus necator (CCUG52238(T)).
abstract: Factors influencing poly(3-hydroxybutyrate) P(3HB) production by Cupriavidus necator CCUG52238(T) utilizing oil palm frond (OPF) juice were clarified in this study. Effects of initial medium pH, agitation speed, and ammonium sulfate (NH(4))(2)SO(4) concentration on the production of P(3HB) were investigated in shake flasks experiments using OPF juice as the sole carbon source. The highest P(3HB) content was recorded at pH 7.0, agitation speed of 220 rpm, and (NH(4))(2)SO(4) concentration at 0.5 g/L. By culturing the wild-type strain of C. necator under the aforementioned conditions, the cell dry weight (CDW) and P(3HB) content obtained were 9.31 ± 0.13 g/L and 45 ± 1.5 wt.%, respectively. This accounted for 40% increment of P(3HB) content compared to the nonoptimized condition. In the meanwhile, the effect of dissolved oxygen tension (DOT) on P(3HB) production was investigated in a 2-L bioreactor. Highest CDW (11.37 g/L) and P(3HB) content (44 wt.%) were achieved when DOT level was set at 30%. P(3HB) produced from OPF juice had a tensile strength of 40 MPa and elongation at break of 8% demonstrated that P(3HB) produced from renewable and cheap carbon source is comparable to those produced from commercial substrate.
authors.affiliation: Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.
authors.forename: Mior Ahmad Khushairi
authors.initials: MA
authors.lastname: Mohd Zahari
authors.forename: Hidayah
authors.initials: H
authors.lastname: Ariffin
authors.forename: Mohd Noriznan
authors.initials: MN
authors.lastname: Mokhtar
authors.forename: Jailani
authors.initials: J
authors.lastname: Salihon
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Shirai
authors.forename: Mohd Ali
authors.initials: MA
authors.lastname: Hassan
mesh_terms: D000645:Ammonium Sulfate / Q000494:pharmacology; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D020118:Cupriavidus necator / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D006885:Hydroxybutyrates / Q000378:metabolism*; D055595:Mechanical Phenomena / Q000187:drug effects; D010100:Oxygen / Q000494:pharmacology; D000073878:Palm Oil; D010936:Plant Extracts / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism*; D010938:Plant Oils / Q000378:metabolism*; D011091:Polyesters / Q000378:metabolism*; D012995:Solubility; D013696:Temperature; D013997:Time Factors; D000094122:Polyhydroxybutyrates
chemical_list: D000645:Ammonium Sulfate; D006885:Hydroxybutyrates; D010100:Oxygen; D000073878:Palm Oil; D010936:Plant Extracts; D010938:Plant Oils; D011091:Polyesters; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates