title: Disposable dry-reagent cotton thread-based point-of-care diagnosis devices for protein and nucleic acid test.
abstract: We report here for the first time by using dry-reagent cotton thread-based point-of-care diagnosis devices for low-cost, sensitive and rapid detection of a lung cancer related biomarker, squamous cell carcinoma antigen (SCCA) and a human genetic disease, hereditary tyrosinemia type I related DNA sequences. A model system comprising SCCA as an analyte and a pair of monoclonal antibodies is used to demonstrate the proof-of-concept on the dry-reagent cotton thread based immunoassay device. An enhancement protocol was employed by using two kinds of gold nanoparticle labels for SCCA test which greatly improved the sensitivity of the device. The assay avoids the multiple incubation and washing steps performed in most conventional protein analyses, which is similar with the lateral flow strip technology. Under optimal conditions, the thread based immunoassay device was capable of measuring 1ng/mL SCCA in 20min which meet the requirement for clinical diagnosis. DNA detection was successfully realized by using a novel adenosine based molecular beacon probe as reporter probes in the cotton thread based device, the linear range is 75-3000fmol which is suitable for quantitative test.
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, Shaanxi Province 710127, PR China. Electronic address: xunmao@nwu.edu.cn.
authors.forename: Xun
authors.initials: X
authors.lastname: Mao
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, Shaanxi Province 710127, PR China.
authors.forename: Ting-E
authors.initials: TE
authors.lastname: Du
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, Shaanxi Province 710127, PR China.
authors.forename: Yiyun
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, Shaanxi Province 710127, PR China.
authors.forename: Lili
authors.initials: L
authors.lastname: Meng
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000032:analysis / Q000097:blood*; D015374:Biosensing Techniques / Q000295:instrumentation; D032561:Cotton Fiber; D004867:Equipment Design; D006046:Gold / Q000737:chemistry*; D006801:Humans; D007118:Immunoassay / Q000295:instrumentation*; D053768:Metal Nanoparticles / Q000737:chemistry*; D051379:Mice; D009696:Nucleic Acids / Q000032:analysis*; D019095:Point-of-Care Systems; D011934:Reagent Strips / Q000032:analysis; D015843:Serpins / Q000032:analysis / Q000097:blood*
chemical_list: D000951:Antigens, Neoplasm; D009696:Nucleic Acids; D011934:Reagent Strips; D015843:Serpins; C051072:squamous cell carcinoma-related antigen; D006046:Gold
keywords: Dry-reagent cotton thread device; Gold nanoparticle labels; Point-of-care diagnosis; Protein and nucleic acid detection