title: Label-free chemiluminescent ATP aptasensor based on graphene oxide and an instantaneous derivatization of guanine bases.
abstract: In this work, a novel label-free chemiluminescent (CL) aptasensor has been developed for rapid and facile detection of adenosine triphosphate (ATP, as model analyte) using graphene oxide (GO) nano-platform. The strategy relies on the preferential binding of GO to single-stranded DNA (ssDNA) over rigid double-stranded DNA (dsDNA) or aptamer-target complexes, and the instantaneous derivative reaction between phenylglyoxal (PGO), a special CL reagent as the signaling molecule, and guanine nucleobases (G) of aptamer strands adsorbed on the surface of GO. In the absence of ATP, the aptamers adsorbed onto the surface of GO leading to a strong background CL signal. Conversely, in the presence of ATP, the aptamers formed the aptamer-ATP complexes which had weak binding ability to GO resulting in a significant CL signal decrease. The CL intensity was adversely related to the ATP concentration in the assay solution. The biosensor's signal decreased linearly with the logarithm of the concentration of ATP from 2 to 80 nmol with a detection limit of 1.4 nmol. The aptasensor also showed high selectivity against cytosine triphosphate (CTP), guanosine triphosphate (GTP), and uridine triphosphate (UTP). The method presented here holds the advantages of being label-free, cost effective, rapid, sensitive and selective, which would shows great promise for clinical application.
authors: Tianjin Key Laboratory for Modern Drug Delivery and High Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, People's Republic of China.
authors: Yinhuan
authors: Y
authors: Song
authors: Xu
authors: X
authors: Yang
authors: Ziqi
authors: Z
authors: Li
authors: Yanjun
authors: Y
authors: Zhao
authors: Aiping
authors: A
authors: Fan
mesh_terms: D000255:Adenosine Triphosphate / Q000032:analysis*; D052157:Aptamers, Nucleotide / Q000737:chemistry*; D015374:Biosensing Techniques / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D006147:Guanine / Q000737:chemistry; D057230:Limit of Detection; D008163:Luminescent Measurements / Q000379:methods*; D010087:Oxides / Q000737:chemistry
chemical_list: D052157:Aptamers, Nucleotide; D010087:Oxides; D006147:Guanine; D006108:Graphite; D000255:Adenosine Triphosphate
keywords: ATP detection; Aptamer; Chemiluminescence; Graphene oxide; Label free