title: Extracellular Polymeric Substances diversity of biofilms grown under contrasted environmental conditions.
abstract: Extracellular Polymeric Substances (EPS) analysis was undertaken on three biofilms grown under different feeding conditions and offering diverging microbial activities and structural characteristics. EPS were extracted by a multi-method protocol including sonication, Tween and EDTA treatments and were characterized by size exclusion chromatography (SEC). Tween and sonication extracts presented higher EPS size diversity compared to EDTA extracts. EPS size diversity also increased with microbial functions within the biofilms and a specific 25-50 kDa cluster was identified only in extracts from biofilms presenting autotrophic activity. Another specific size cluster (180 kDa) occurred in Tween extracts provided from the mechanically stable biofilms. Such specific EPS appear as potential indicators for describing microbial and structural properties of biofilms. This study brings new elements for designing EPS fractionation and shows that size distribution analysis is an interesting tool to relate EPS diversity with macro-scale characteristics of biofilms.
authors.affiliation: LBAE, Laboratoire de Biologie appliquée à l'Agro-alimentaire et à l'Environnement, Institut Universitaire de Technologie, Université Paul Sabatier Toulouse III, 24 Rue d'Embaquès, 32000 Auch, France.
authors.forename: Monique
authors.initials: M
authors.lastname: Ras
authors.forename: Dominique
authors.initials: D
authors.lastname: Lefebvre
authors.forename: Nicolas
authors.initials: N
authors.lastname: Derlon
authors.forename: Etienne
authors.initials: E
authors.lastname: Paul
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Girbal-Neuhauser
mesh_terms: D001419:Bacteria / Q000166:cytology / Q000378:metabolism; D001426:Bacterial Proteins / Q000032:analysis; D001433:Bacteriolysis; D018441:Biofilms / Q000187:drug effects / Q000254:growth & development*; D001704:Biopolymers / Q000302:isolation & purification*; D002241:Carbohydrates / Q000032:analysis; D058440:Denitrification; D004777:Environment; D005110:Extracellular Space / Q000737:chemistry*; D008970:Molecular Weight; D058465:Nitrification; D012995:Solubility
chemical_list: D001426:Bacterial Proteins; D001704:Biopolymers; D002241:Carbohydrates