title: Biodegradation of chlorsulfuron and metsulfuron-methyl by Aspergillus niger.
abstract: In this work, investigations were performed under laboratory conditions of the degradation ability by a common soil fungus, Aspergillus niger, toward chlorsulfuron and metsulfuron-methyl. The results were very encouraging (79% for chlorsulfuron and 61% for metsulfuron-methyl of total degradation), especially compared to those registered in our previous studies with a Pseudomonas fluorescens strain B2 (about 21 to 32%). Furthermore, the chemical degradation of the two compounds was studied and two products (1[2-methoxy-benzene-1-sulfonyl]-7-acetyltriuret and 1[2-chlorobenzene-1-sulfonyl]-7-acetyltriuret) were isolated and characterised by hydrolysis in acidic conditions. Our aim in the future will be the identification of intermediate metabolites by HPLC and LC-MS analyses in order to identify the degradative pathway by the fungal strain and to compare this to those obtained by chemical degradation and by P. fluorescens strain.
authors.affiliation: Dipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Sezione MAAE, Università di Milano, via Celoria 2, I-20133 Milano, Italy. elisabetta.zanardini@unimi.it
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Zanardini
authors.forename: Marco
authors.initials: M
authors.lastname: Negri
authors.forename: Giovanna
authors.initials: G
authors.lastname: Boschin
authors.forename: Alessandra
authors.initials: A
authors.lastname: D'Agostina
authors.forename: Anna
authors.initials: A
authors.lastname: Valle
authors.forename: Anna
authors.initials: A
authors.lastname: Arnoldi
authors.forename: Claudia
authors.initials: C
authors.lastname: Sorlini
mesh_terms: D001190:Arylsulfonates / Q000737:chemistry / Q000378:metabolism*; D001234:Aspergillus niger / Q000378:metabolism*; D001673:Biodegradation, Environmental; D004785:Environmental Pollutants; D006868:Hydrolysis; D015394:Molecular Structure; D013449:Sulfonamides / Q000737:chemistry / Q000378:metabolism*; D014227:Triazines / Q000737:chemistry / Q000378:metabolism*
chemical_list: D001190:Arylsulfonates; D004785:Environmental Pollutants; D013449:Sulfonamides; D014227:Triazines; C050296:metsulfuron methyl; C037137:chlorsulfuron