title: Enhanced biodegradation of asphalt in the presence of Tween surfactants, Mn(2+) and H2O2 by Pestalotiopsis sp. in liquid medium and soil.
abstract: Asphalt and fractions thereof can contaminate water and soil environments. Forming as residues in distillation products in crude oil refineries, asphalts consist mostly of asphaltene instead of aliphatics, aromatics, and resins. The high asphaltene content might be responsible for the decrease in bioavailability to microorganisms and therefore reduce the biodegradability of asphalt in the environment. In this study, the effect on asphalt biodegradation by Pestalotiopsis sp. in liquid medium and soil of nonionic Tween surfactants in the presence of Mn2+ and H2O2 was examined. The degradation was enhanced by Tween 40 or Tween 80 (0.1%) in the presence of Mn2+ (1 mM) and H2O2 (0.05 mM). A Tween surfactant, Mn2+, and H2O2 can overcome bioavailability-mediated constraints and increase ligninolytic activities, particularly manganese peroxidase and laccase activities. The study is significant for the bioremediation of asphalt and/or viscous-crude oil-contaminated environments.
authors: The United Graduate School of Agricultural Sciences, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 790-8566, Japan; Research and Development Unit for Biomaterials, Indonesian Institute of Sciences, Jl. Raya Bogor, Km. 46, Cibinong, Bogor 16911, Indonesia. Electronic address: dede@biomaterial.lipi.go.id.
authors: Dede Heri Yuli
authors: DH
authors: Yanto
authors: Department of Applied Bioscience, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 790-8566, Japan. Electronic address: tatibana@agr.ehime-u.ac.jp.
authors: Sanro
authors: S
authors: Tachibana
mesh_terms: D001203:Ascomycota / Q000378:metabolism*; D001673:Biodegradation, Environmental; D006838:Hydrocarbons / Q000378:metabolism*; D006861:Hydrogen Peroxide / Q000378:metabolism*; D008345:Manganese / Q000378:metabolism*; D011136:Polysorbates / Q000737:chemistry*; D013501:Surface-Active Agents / Q000378:metabolism*
chemical_list: D006838:Hydrocarbons; D011136:Polysorbates; D013501:Surface-Active Agents; D008345:Manganese; C006647:asphalt; D006861:Hydrogen Peroxide; C068430:polysorbate 40
keywords: Asphalt; Biodegradation; Ligninolytic enzymes; Pestalotiopsis sp.; Tween surfactants