title: Natural Products among Brown Algae: The Case of Cystoseira schiffneri Hamel (Sargassaceae, Phaeophyceae).
abstract: A chemotaxonomic study on the marine brown alga Cystoseira schiffneri collected from the Tunisian marine coast allowed us to identify kjellmanianone (1) and a new isololiolide derivative named schiffnerilolide (2). The structure elucidation and the assignment of relative configurations of the isolated natural products were based on advanced mass spectrometric and nuclear magnetic resonance techniques. This outcome suggested a close phylogenetic relationship of C. schiffneri with brown algae belonging to genus Sargassum C. Agardh. Molecular characterization using the nuclear small subunit rRNA (SSU rRNA) gene (18S) sequence as genetic marker was made. Pigment analysis showed a significant seasonal change of carotenoids, in particular of fucoxanthin and fucoxanthinol. Also galactolipids, the main constituents of the thylakoid membranes, showed remarkable seasonal changes.
authors.affiliation: Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia.|Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy.
authors.forename: Abdelkader Ben
authors.initials: AB
authors.lastname: Salem
authors.affiliation: Unit of Zoology-Anthropology, Department of Biology, University of Pisa, 56126, Pisa, Italy.
authors.forename: Graziano
authors.initials: G
authors.lastname: Di Giuseppe
authors.affiliation: Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Anesi
authors.affiliation: Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia.
authors.forename: Saoussen
authors.initials: S
authors.lastname: Hammami
authors.affiliation: Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia.
authors.forename: Zine
authors.initials: Z
authors.lastname: Mighri
authors.affiliation: Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy.|Biophysical Institute, CNR, 38123, Povo, Trento, Italy.|Centre for Agriculture, Food and Environment, University of Trento, via Mach 1, 38010, San Michele all Adige, Trento, Italy.
authors.forename: Graziano
authors.initials: G
authors.lastname: Guella
mesh_terms: D002338:Carotenoids / Q000378:metabolism; D002965:Classification; D038983:Galactolipids / Q000378:metabolism; D007536:Isomerism; D015394:Molecular Structure; D000459:Phaeophyceae / Q000737:chemistry* / Q000145:classification*; D010802:Phylogeny; D012621:Seasons; D014416:Tunisia
chemical_list: D038983:Galactolipids; D002338:Carotenoids
keywords: 
  Cystoseira schiffneri
  ; Brown algae; Lipid analysis; Molecular characterization; Phytochemical investigation