title: Fluorescence Regulation of Poly(thymine)-Templated Copper Nanoparticles via an Enzyme-Triggered Reaction toward Sensitive and Selective Detection of Alkaline Phosphatase.
abstract: The activity of alkaline phosphatase (ALP) is a crucial index of blood routine examinations, since the concentration of ALP is highly associated with various human diseases. To address the demands of clinical tests, efforts should be made to develop more approaches that can sense ALP in real samples. Recently, we find that fluorescence of poly(30T)-templated copper nanoparticles (CuNPs) can be directly and effectively quenched by pyrophosphate ion (PPi), providing new perspective in designing sensitive biosensors based on DNA-templated CuNPs. In addition, it has been confirmed that phosphate ion (Pi), product of PPi hydrolysis, does not affect the intense fluorescence of CuNPs. Since ALP can specifically hydrolyze PPi into Pi, fluorescence of CuNPs is thus regulated by an ALP-triggered reaction, and a novel ALP biosensor is successfully developed. As a result, ALP is sensitively and selectively quantified with a wide linear range of 6.0 × 10-2U/L to 6.0 × 102U/L and a low detection limit of 3.5 × 10-2U/L. Besides, two typical inhibitors of ALP are evaluated by this analytical method, and different inhibitory effects are indicated. More importantly, by challenging this biosensor with real human serums, the obtained results get a fine match with the data from clinical tests, and the serum sample from a patient with liver disease is clearly distinguished, suggesting promising applications of this biosensor in clinical diagnosis.
authors.affiliation: Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University , Nanjing, 210023, People's Republic of China.
authors.forename: Junyao
authors.initials: J
authors.lastname: Li
authors.affiliation: Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University , Nanjing, 210023, People's Republic of China.
authors.forename: Ling
authors.initials: L
authors.lastname: Si
authors.affiliation: Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University , Nanjing, 210023, People's Republic of China.
authors.forename: Jianchun
authors.initials: J
authors.lastname: Bao
authors.affiliation: Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University , Nanjing, 210023, People's Republic of China.
authors.forename: Zhaoyin
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University , Nanjing, 210023, People's Republic of China.
authors.forename: Zhihui
authors.identifier: 0000-0001-7049-7217
authors.initials: Z
authors.lastname: Dai
mesh_terms: D000469:Alkaline Phosphatase / Q000097:blood* / Q000378:metabolism; D015374:Biosensing Techniques; D003300:Copper / Q000737:chemistry*; D005453:Fluorescence; D006801:Humans; D008107:Liver Diseases / Q000097:blood / Q000175:diagnosis / Q000378:metabolism; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties; D013941:Thymine / Q000737:chemistry*
chemical_list: D011108:Polymers; D003300:Copper; D000469:Alkaline Phosphatase; D013941:Thymine