title: Lipid biomarkers profile--presence of coprostanol: recent sediments from Rodrigo de Freitas Lagoon-Rio de Janeiro, Brazil.
abstract: Coprostanol (contribution characteristic from anthropogenic pollution) and other lipid biomarkers (sterols, fatty alcohols and fatty acids) were identified and quantified in recent sediment extracts from Rodrigo de Freitas Lagoon, a touristy spot of Rio de Janeiro-Brazil, using gas chromatography with mass selective detector (GC-MSD). The determination of lipid biomarkers profile indicates an autochthonous biogenic contribution due to the presence of phytoplankton, zooplankton, bacteria and dinoflagellates. The allochthonous biogenic contribution was confirmed by detection of biomarkers from higher plants in the sediments due to the influence of the Atlantic Forest inserted in the studied region. The concentration of the studied compounds varied from 5.53 to 216.47 microg.g(-1) for sterols, 0.47 to 5.35 microg.g(-1) for fatty alcohols, 20.15 to 66.22 microg.g(-1) for fatty acids and 0.08 to 3.98 microg.g(-1) for coprostanol. The presence of coprostanol was attributed to illegal untreated sewage discharge in the pluvial collector which ends up in the Lagoon.
authors.affiliation: Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: Josemar Luis
authors.initials: JL
authors.lastname: Stefens
authors.forename: João Henrique Z
authors.initials: JH
authors.lastname: dos Santos
authors.forename: João Graciano
authors.initials: JG
authors.lastname: Mendonça Filho
authors.forename: Carla Graziele Azevedo
authors.initials: CG
authors.lastname: da Silva
authors.forename: Maria
authors.initials: M
authors.lastname: do Carmo Ruaro Peralba
mesh_terms: D000818:Animals; D001419:Bacteria; D015415:Biomarkers / Q000032:analysis; D001938:Brazil; D004141:Dinoflagellida; D004784:Environmental Monitoring; D005227:Fatty Acids / Q000032:analysis*; D005233:Fatty Alcohols / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis*; D010839:Phytoplankton; D012722:Sewage; D014874:Water Pollutants, Chemical / Q000032:analysis*; D015048:Zooplankton
chemical_list: D015415:Biomarkers; D005227:Fatty Acids; D005233:Fatty Alcohols; D012722:Sewage; D014874:Water Pollutants, Chemical