title: Fluorescence resonance energy transfer biosensor between upconverting nanoparticles and palladium nanoparticles for ultrasensitive CEA detection.
abstract: An ultrasensitive biosensor for carcinoembryonic antigen (CEA) was constructed based on fluorescence resonance energy transfer (FRET) between upconverting nanoparticles (UCPs) and palladium nanoparticles (PdNPs). PdNPs was synthesized by the addition of a solution of Na2PdCl4 into a mixture of N2H4·H2O as the reducing agent and 11-mercaptoundecanoic acid (MUDA) as the stabilizer. The CEA aptamer (5'-NH2-ATACCAGCTTATTCAATT-3') was conjugated to hexanedioic acid (HDA) modified UCPs (HDA-UCPs) through an EDC-NHS coupling protocol. The coordination interaction between nitrogen functional groups of the CEA aptamer and PdNPs brought UCPs and PdNPs in close proximity, which resulted in the fluorescence quenching of UCPs to an extent of 85%. And the non-specific fluorescence quenching caused by PdNPs towards HDA-UCPs was negligible. After the introduction of CEA into the UCPs-CEA aptamer-PdNPs fluorescence quenching system, the CEA aptamer preferentially combined with CEA accompanied by the conformational change which weakened the coordination interaction between the CEA aptamer and PdNPs. So fluorescence recovery of UCPs was observed and a linear relationship between the fluorescence recovery of UCPs and the concentration of CEA was obtained in the range from 2pg/mL to 100pg/mL in the aqueous buffer with the detection limit of 0.8pg/mL. The ultrasensitive detection of CEA was also realized in diluted human serum with a linear range from 4pg/mL to 100pg/mL and a detection limit of 1.7pg/mL. This biosensor makes the most of the high quenching ability of PdNPs towards UCPs with negligible non-specific fluorescence quenching and has broad application prospects in biochemistry.
authors.affiliation: Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, PR China; Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, Wuhan 430062, PR China; Laboratory of Quality and Safety Risk Assessment for Oilseed Products (Wuhan), Ministry of Agriculture, Wuhan 430062, PR China; Key Laboratory of Detection for Mycotoxins, Ministry of Agriculture, Wuhan 430062, PR China; Quality Inspection and Test Center for Oilseeds Products, Ministry of Agriculture, Wuhan 430062, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Pharmacy, Wuhan Children's Hospital, No. 100 Hongkong Rd, Wuhan 430016, PR China.
authors.forename: Liang
authors.initials: L
authors.lastname: Shi
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
authors.forename: De-En
authors.initials: DE
authors.lastname: Sun
authors.affiliation: Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, PR China; Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, Wuhan 430062, PR China; Laboratory of Quality and Safety Risk Assessment for Oilseed Products (Wuhan), Ministry of Agriculture, Wuhan 430062, PR China; Key Laboratory of Detection for Mycotoxins, Ministry of Agriculture, Wuhan 430062, PR China; Quality Inspection and Test Center for Oilseeds Products, Ministry of Agriculture, Wuhan 430062, PR China. Electronic address: peiwuli@oilcrops.cn.
authors.forename: Peiwu
authors.initials: P
authors.lastname: Li
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China. Electronic address: zhhliu@whu.edu.cn.
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Liu
mesh_terms: D001774:Blood Chemical Analysis / Q000379:methods*; D002272:Carcinoembryonic Antigen / Q000097:blood*; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods*; D006801:Humans; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D015336:Molecular Probe Techniques; D058726:Nanoconjugates / Q000737:chemistry / Q000648:ultrastructure; D010165:Palladium / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D002272:Carcinoembryonic Antigen; D058726:Nanoconjugates; D010165:Palladium
keywords: Carcinoembryonic antigen; Fluorescence quenching ability; Fluorescence resonance energy transfer; Palladium nanoparticles; Upconverting nanoparticles