title: Effects of metal ions on biomass and 5-aminolevulinic acid production in Rhodopseudomonas palustris wastewater treatment.
abstract: This work investigated the effects of eight metal ions on Rhodopseudomonas palustris growth and 5-aminolevulinic acid (ALA) yield in wastewater treatment. Results show that metal ions (Mg(2+) of 15 mmol/L, Fe(2+) of 400 μmol/L, Co(2+) of 4 μmol/L, Ni(2+) of 8 μmol/L and Zn(2+) of 4 μmol/L) could effectively improve the chemical oxygen demand (COD) removal, Rp. palustris biomass and ALA yield. The highest ALA yield of 13.1 mg/g-biomass was achieved with Fe(2+) of 400 μmol/L. ALA yields were differentially increased under different metal ions in the following order: Fe(2+) group > Mg(2+) group > Co(2+) group = Ni(2+) group > Zn(2+) group = Mo(2+) group > control. Cu(2+) and Mn(2+) inhibited Rp. palustris growth and ALA production. Mechanism analysis revealed that metal ions changed ALA yields by influencing the activities of ALA synthetase and ALA dehydratase.
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail: zgm@ruc.edu.cn.
authors.forename: Shuli
authors.initials: S
authors.lastname: Liu
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail: zgm@ruc.edu.cn; School of Environment and Resource, Renmin University of China, Beijing 100872, China.
authors.forename: Guangming
authors.initials: G
authors.lastname: Zhang
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail: zgm@ruc.edu.cn.
authors.forename: Jianzheng
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail: zgm@ruc.edu.cn.
authors.forename: Xiangkun
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail: zgm@ruc.edu.cn.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000622:Aminolevulinic Acid / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D007477:Ions; D008670:Metals / Q000494:pharmacology*; D012241:Rhodopseudomonas / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism*; D062065:Wastewater
chemical_list: D000622:Aminolevulinic Acid; D007477:Ions; D008670:Metals; D062065:Wastewater