Dithio-phospholipids for oriented immobilization of proteins to gold surfaces

We report the syntheses of phospholipids containing a dithio-group on their hydrophobic end and a choline or a biotin-group on their hydrophilic end. As demonstrated by surface plasmon resonance, a monolayer of these dithiolipids on gold affords specific binding of streptavidin and of biotinylated molecules in further steps.