Task1: Lipidome analysis Analyses performed on the adipose tissue samples will be: i) triglyceride fatty acid composition, and ii) adipose cells membrane phospholipids classes relative amounts. Five major phospholipids classes found in the plasma membrane of adipose cells can be separated and quantified: phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylserine and sphingomyelin. Adipose tissue being mostly composed of triacylglycerol and only approximately 1% phospholipids, the study of membrane phospholipids will require larger sample amounts (5 g) than would typically be necessary for triglycerides fatty acid composition analysis (400-500 mg).