title: Seasonal changes in lipid classes and fatty acid composition in the digestive gland of Pecten maximus.
abstract: Seasonal variations in lipid classes and fatty acid composition of triacylglycerols and phospholipids in the digestive gland of Pecten maximus were studied over a period of 16 months. Acylglycerols predominated (19-77% of total lipids), in accordance with the role of the digestive gland as an organ for lipid storage in scallops. Seasonal variations were mainly seen in the acylglycerol content, while phospholipids (2.5-10.0% of total lipids) and sterols (1.9-7.4% of total lipids) showed only minor changes. The most abundant fatty acids were 14:0, 16:0, 18:0, 16:1(n-7), 18:1(n-9), 18:1(n-7), 18:4(n-3), 20:5(n-3) and 22:6(n-3) and these showed similar seasonal profiles in both, triacylglycerol and phospholipid fractions. In contrast to the phospholipid fraction, the triacylglycerol fraction contained more 20:5(n-3) than 22:6(n-3). In three phospholipid samples we noted a high percentage of a 22-2-non-methylene-interrupted fatty acid, previously described to have a structural role in several bivalve species. The main polyunsaturated fatty acids displayed important seasonal variations parallel to those of the acylglycerols, suggesting good nutritional conditions. A positive correlation existed between the level of saturated fatty acids and temperature, whereas the levels of polyunsaturated fatty acids correlated negatively with temperature.
authors.affiliation: Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Instituto de Acuicultura, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain. bnanto@usc.es
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Pazos
authors.forename: José L
authors.initials: JL
authors.lastname: Sánchez
authors.forename: Guillermo
authors.initials: G
authors.lastname: Román
authors.forename: M
authors.initials: M
authors.lastname: Luz Pérez-Parallé
authors.forename: Marcelina
authors.initials: M
authors.lastname: Abad
mesh_terms: D000818:Animals; D001823:Body Composition; D004064:Digestive System / Q000737:chemistry*; D005227:Fatty Acids / Q000032:analysis* / Q000737:chemistry*; D008055:Lipids / Q000032:analysis* / Q000737:chemistry / Q000145:classification*; D008974:Mollusca / Q000737:chemistry*; D012621:Seasons; D013045:Species Specificity
chemical_list: D005227:Fatty Acids; D008055:Lipids