title: Highly efficient colorimetric detection of target cancer cells utilizing superior catalytic activity of graphene oxide-magnetic-platinum nanohybrids.
abstract: Enzyme-linked immunosorbent assays (ELISAs) have most widely been applied in immunoassays for several decades. However, several unavoidable limitations (e.g., instability caused by structural unfolding) of natural enzymes have hindered their widespread applications. Here, we describe a new nanohybrid consisting of Fe₃O₄ magnetic nanoparticles (MNPs) and platinum nanoparticles (Pt NPs), simultaneously immobilized on the surface of graphene oxide (GO). By synergistically integrating highly catalytically active Pt NPs and MNPs on GO whose frameworks possess high substrate affinity, the nanohybrid is able to achieve up to a 30-fold higher maximal reaction velocity (V(max)) compared to that of free GO for the colorimetric reaction of the peroxidase substrate, 3,3',5,5'-tetramethylbenzidine (TMB), and enable rapid detection of target cancer cells. Specifically, using this new assay system, clinically important breast cancer cells are detected in a 5 min time period at room temperature with high specificity and sensitivity. The remarkably high capability to catalyze oxidation reactions could allow the nanohybrid to replace conventional peroxidase-based immunoassay systems as part of new, rapid, robust and convenient assay systems which can be widely utilized for the identification of important target molecules.
authors: Department of Chemical and Biomolecular Engineering (BK21+ Program), KAIST, Daejeon, 305-701, Republic of Korea. hgpark@kaist.ac.kr.
authors: Moon Il
authors: MI
authors: Kim
authors: Min Su
authors: MS
authors: Kim
authors: Min-Ah
authors: MA
authors: Woo
authors: Youngjin
authors: Y
authors: Ye
authors: Kyoung Suk
authors: KS
authors: Kang
authors: Jinwoo
authors: J
authors: Lee
authors: Hyun Gyu
authors: HG
authors: Park
mesh_terms: D001560:Benzidines / Q000737:chemistry; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000378:metabolism; D002384:Catalysis; D003124:Colorimetry / Q000379:methods*; D005260:Female; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D007118:Immunoassay; D007700:Kinetics; D008280:Magnetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D017348:Microscopy, Electron, Scanning Transmission; D036103:Nanotechnology; D010087:Oxides / Q000737:chemistry*; D009195:Peroxidase / Q000737:chemistry; D010544:Peroxidases / Q000737:chemistry; D010984:Platinum / Q000737:chemistry*; D012680:Sensitivity and Specificity; D014961:X-Ray Diffraction
chemical_list: D001560:Benzidines; D010087:Oxides; C021758:3,3',5,5'-tetramethylbenzidine; D010984:Platinum; D006108:Graphite; D010544:Peroxidases; D009195:Peroxidase