title: Interfacial properties and in vitro cytotoxic effects of surface-modified near infrared absorbing Au-Au(2)S nanoparticles.
abstract: Near infrared (NIR) absorbing Au-Au(2)S nanoparticles were modified with surfactants of different hydrocarbon chain lengths to allow loading of anticancer drug, cisplatin. The interfacial interactions and surfactant chain length effects on drug loading, optical properties and cytotoxicity were discussed in this work. Short-chain surfactants were oriented closer to the surface normal and were adsorbed at higher densities. Surface modification also changed the optical properties of the particles. Notably, particles modified with short-chain surfactants exhibited a red shift, whereas particles modified with long-chain surfactants showed a blue shift. The in vitro cytotoxicity of drug-loaded surface-modified particles was dependent on the surfactants' chain length. Significant cytotoxicity was observed for 1 mg/ml of drug-loaded particles using surfactants with the shortest chain length. After NIR triggered drug release, the released Pt compounds were observed to be cytotoxic, while remaining nanoparticles did not exhibit any cytotoxicity. Also, the released Pt compounds upon NIR irradiation of drug-loaded particles were observed to be more toxic and had a different molecular structure from cisplatin.
authors.affiliation: Molecular Engineering of Biological and Chemical Systems, Singapore-MIT Alliance, Singapore 117576, Singapore. meichee.tan@gmail.com
authors.forename: Mei Chee
authors.initials: MC
authors.lastname: Tan
authors.forename: Jackie Y
authors.initials: JY
authors.lastname: Ying
authors.forename: Gan Moog
authors.initials: GM
authors.lastname: Chow
mesh_terms: D000042:Absorption; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D002945:Cisplatin / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology; D020099:Coated Materials, Biocompatible / Q000737:chemistry* / Q000378:metabolism; D004337:Drug Carriers / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D004355:Drug Stability; D006047:Gold Alloys / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008954:Models, Biological; D019265:Spectroscopy, Near-Infrared; D013499:Surface Properties; D013501:Surface-Active Agents / Q000008:administration & dosage / Q000493:pharmacokinetics; D013696:Temperature; D018675:Toxicity Tests; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D020099:Coated Materials, Biocompatible; D004337:Drug Carriers; D006047:Gold Alloys; D013501:Surface-Active Agents; D002945:Cisplatin