title: Simultaneous electrochemical detection of multiple tumor markers based on dual catalysis amplification of multi-functionalized onion-like mesoporous graphene sheets.
abstract: In this work, a sandwich-type electrochemical immunosensor for simultaneous sensitive detection of prostate specific antigen (PSA) and free prostate specific antigen (fPSA) is fabricated. Gold nanoparticles (AuNPs) modified Prussian blue and nickel hexacyanoferrates nanoparticles were firstly prepared, respectively, and then decorated onion-like mesoporous graphene sheets (denoted as Au@PBNPs/O-GS and Au@NiNPs/O-GS) as distinguishable signal tags to label different detection antibodies. Subsequently, streptavidin and biotinylated alkaline phosphatase (bio-AP) were employed to block the possible remaining active sites. With the employment of the as prepared nanohybrids, the dual catalysis amplification can be achieved by catalysis of the ascorbic acid 2-phosphate to in situ produce AA in the presence of bio-AP, and then AA was further catalyzed by Au@PBNPs/O-GS and Au@NiNPs/O-GS nanohybrids, respectively, to obtain the higher signal responses. The experiment results show that the linear range of the proposed immunosensor for simultaneous determination of fPSA is from 0.02 to 10 ng mL(-1) with a detection limit of 6.7 pg mL(-1) and PSA is from 0.01 to 50 ng mL(-1) with a detection limit of 3.4 pg mL(-1) (S/N=3). Importantly, the proposed method offers promise for rapid, simple and cost-effective analysis of biological samples.
authors.affiliation: Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Han
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhuo
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Chai
authors.forename: Ruo
authors.initials: R
authors.lastname: Yuan
authors.forename: Wen
authors.initials: W
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhu
mesh_terms: D000469:Alkaline Phosphatase / Q000737:chemistry; D000906:Antibodies / Q000737:chemistry; D001665:Binding Sites; D014408:Biomarkers, Tumor / Q000032:analysis* / Q000737:chemistry; D015374:Biosensing Techniques; D002384:Catalysis; D055664:Electrochemical Techniques; D004566:Electrodes; D005295:Ferrocyanides / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D008297:Male; D053768:Metal Nanoparticles / Q000737:chemistry; D009532:Nickel / Q000737:chemistry; D017430:Prostate-Specific Antigen / Q000032:analysis* / Q000737:chemistry; D011471:Prostatic Neoplasms / Q000175:diagnosis*; D019809:Streptavidin / Q000737:chemistry
chemical_list: D000906:Antibodies; D014408:Biomarkers, Tumor; D005295:Ferrocyanides; C116383:ferrocyn; D006046:Gold; D006108:Graphite; D009532:Nickel; D019809:Streptavidin; D000469:Alkaline Phosphatase; D017430:Prostate-Specific Antigen