title: Influence of organic loading rate and solid retention time on polyhydroxybutyrate production from hybrid poplar hydrolysates using mixed microbial cultures.
abstract: The aim of this study was to investigate the potential of using wood hydrolysates (enzymatically hydrolyzed from hybrid poplar) as substrate to produce polyhydroxybutyrate (PHB) using mixed microbial cultures. The optimal operational conditions for fed-batch bioreactors were 4d solid retention time with an organic loading rate of 2.5g/Ld. The maximum PHB accumulated was 27% of cell dry weight with a yield of 0.32g/g (g PHB produced per g sugars consumed). Microbial community analysis was done at the genus level by 16S rRNA sequencing on an Illumina system and community evolution was observed among different samples and initial seed. Actinobacteria, Alpha- and Beta-proteobacteria were found to be the dominant groups in all the bioreactors. Several PHB-storing microorganisms were characterized belonging to Alpha- and Beta-proteobacteria.
authors.affiliation: Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID 83844-1132, United States.
authors.forename: Jing
authors.initials: J
authors.lastname: Dai
authors.affiliation: Department of Biological Sciences and the Institute for Bioinformatics and Evolutionary Studies, University of Idaho, Moscow, ID 83844, United States.
authors.forename: Karol
authors.initials: K
authors.lastname: Gliniewicz
authors.affiliation: Department of Biological Sciences and the Institute for Bioinformatics and Evolutionary Studies, University of Idaho, Moscow, ID 83844, United States.
authors.forename: Matthew L
authors.initials: ML
authors.lastname: Settles
authors.affiliation: Department of Civil Engineering, University of Idaho, Moscow, ID 83844, United States.
authors.forename: Erik R
authors.initials: ER
authors.lastname: Coats
authors.affiliation: Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID 83844-1132, United States. Electronic address: armandm@uidaho.edu.
authors.forename: Armando G
authors.initials: AG
authors.lastname: McDonald
mesh_terms: D018533:Biomass; D019149:Bioreactors / Q000382:microbiology*; D006885:Hydroxybutyrates / Q000138:chemical synthesis*; D032107:Populus / Q000737:chemistry*; D020560:Proteobacteria; D014934:Wood / Q000737:chemistry
chemical_list: D006885:Hydroxybutyrates
keywords: 16S rRNA sequencing; Mixed microbial cultures; Polyhydroxybutyrate; Wood hydrolysates