title: Effect of rhamnolipids on degradation of anthracene by two newly isolated strains, Sphingomonas sp. 12A and Pseudomonas sp. 12B.
abstract: Anthracene is a PAH that is not readily degraded, plus its degradation mechanism is still not clear. Thus, two strains of bacteria-degrading bacteria were isolated from longterm petroleum-polluted soil and identified as Sphingomonas sp. 12A and Pseudomonas sp. 12B by a 16S rRNA sequence analysis. To further enhance the anthracene-degrading ability of the two strains, the biosurfactants produced by Pseudomonas aeruginosa W3 were used, which were characterized as rhamnolipids. It was found that these rhamnolipids dramatically increased the solubility of anthracene, and a reverse-phase HPLC assay showed that the anthracene degradation percentage after 18 days with Pseudomonas sp. 12B was significantly enhanced from 34% to 52%. Interestingly, their effect on the degradation by Sphingomonas sp. 12A was much less, from 35% to 39%. Further study revealed that Sphingomonas sp. 12A also degraded the rhamnolipids, which may have hampered the effect of the rhamnolipids on the anthracene degradation.
authors.affiliation: College of Life Sciences, Wuhan University, Wuhan 430072, PR China.
authors.forename: Chang-Zheng
authors.initials: CZ
authors.lastname: Cui
authors.forename: Chi
authors.initials: C
authors.lastname: Zeng
authors.forename: Xia
authors.initials: X
authors.lastname: Wan
authors.forename: Dong
authors.initials: D
authors.lastname: Chen
authors.forename: Jia-Yao
authors.initials: JY
authors.lastname: Zhang
authors.forename: Ping
authors.initials: P
authors.lastname: Shen
mesh_terms: D000873:Anthracenes / Q000378:metabolism*; D001673:Biodegradation, Environmental; D001709:Biotechnology / Q000379:methods; D003470:Culture Media; D006017:Glycolipids / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D010578:Petroleum; D011549:Pseudomonas / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D012995:Solubility; D020578:Sphingomonas / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D013501:Surface-Active Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology
chemical_list: D000873:Anthracenes; D003470:Culture Media; D006017:Glycolipids; D010578:Petroleum; D012989:Soil Pollutants; D013501:Surface-Active Agents; C418382:rhamnolipid; C034020:anthracene