title: Growth of Azotobacter chroococcum in chemically defined media containing p-hydroxybenzoic acid and protocatechuic acid.
abstract: Growth and utilization of different phenolic acids present in olive mill wastewater (OMW) by Azotobacter chroococcum were studied in chemically defined media. Growth and utilization of phenolic acids were only detected when the microorganism was cultured on p-hydroxybenzoic acid at concentration from 0.01% to 0.5% (w/v) and protocatechuic acid at concentration from 0.01% to 0.3% (w/v) as sole carbon sources suggesting that only these phenolic compounds could be utilized as a carbon source by A. chroococcum. Moreover when culture media were added with a mixture of 0.3% of protocatechuic acid and 0.3% p-hydroxybenzoic acid, the microorganism degradated in first place protocatechuic acid and once the culture medium was depleted of this compound, the degradation of p-hydroxybenzoic acid commenced very fast.
authors.affiliation: Environmental Microbiology Group, Instituto del Agua, Universidad de Granada, Ramon y Cajal No. 4, Granada 18071, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Juarez
authors.forename: M V
authors.initials: MV
authors.lastname: Martinez-Toledo
authors.forename: J
authors.initials: J
authors.lastname: Gonzalez-Lopez
mesh_terms: D001395:Azotobacter / Q000254:growth & development* / Q000378:metabolism; D001673:Biodegradation, Environmental; D005308:Fertilizers; D062385:Hydroxybenzoates / Q000378:metabolism*; D007220:Industrial Waste; D000069463:Olive Oil; D010226:Parabens / Q000378:metabolism*; D010938:Plant Oils; D014865:Waste Disposal, Fluid
chemical_list: D005308:Fertilizers; D062385:Hydroxybenzoates; D007220:Industrial Waste; D000069463:Olive Oil; D010226:Parabens; D010938:Plant Oils; C009091:protocatechuic acid