title: Adsorption of amphipathic dendrons on polystyrene nanoparticles.
abstract: Adsorption of dendrons onto nanoparticles may provide new model structures which may be useful in drug and gene delivery. Tritiated amphipathic dendrons having three lipidic (C(14)) chains coupled to branched (dendritic) lysine head groups with 8, 16 or 32 free terminal amino groups have been synthesised by solid phase peptide techniques. The interaction between these tritiated dendrons and 200 nm polystyrene latex nanoparticles was investigated in phosphate buffered saline. The amount of dendron adsorbed increased with increasing concentration of dendrons and then decreased. Maximum adsorption of dendrons per gram of nanoparticles was found to be between 8.2 and 84 x 10(-6)M, the amounts adsorbed being inversely proportional to the number of amino groups present in the molecule. The number of dendron molecules adsorbed per nanoparticle was found to be between 430 and 4421. The degree of adsorption was found to be slightly altered by the temperature.
authors.affiliation: Centre for Drug Delivery Research, The School of Pharmacy, University of London, 29/39 Brunswick Square, London WC 1N 1AX, UK.
authors.forename: T
authors.initials: T
authors.lastname: Sakthivel
authors.forename: A T
authors.initials: AT
authors.lastname: Florence
mesh_terms: D000327:Adsorption; D000596:Amino Acids / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004337:Drug Carriers; D008863:Microspheres; D036103:Nanotechnology; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature
chemical_list: D000596:Amino Acids; D004337:Drug Carriers; D011137:Polystyrenes; D013501:Surface-Active Agents; D011092:Polyethylene Glycols