In this paper several advances were implemented for glycoprofiling of prostate specific antigen (PSA), what can be applied for better prostate cancer (PCa) diagnostics in the future: 1) application of Au nanoshells with a magnetic core (MP@silica@Au); 2) use of surface plasmons of Au nanoshells with a magnetic core for spontaneous immobilization of zwitterionic molecules via diazonium salt grafting; 3) a double anti-fouling strategy with integration of zwitterionic molecules on Au surface and on MP@silica@Au particles was implemented to resist non-specific protein binding; 4) application of anti-PSA antibody modified Au nanoshells with a magnetic core for enrichment of PSA from a complex matrix of a human serum; 5) direct incubation of anti-PSA modified MP@silica@Au with affinity bound PSA to the lectin modified electrode surface. The electrochemical impedance spectroscopy (EIS) signal was enhanced 43 times integrating Au nanoshells with a magnetic core compared to the biosensor without them. This proof-of-concept study shows that the biosensor could detect PSA down to 1.2 fM and at the same time to glycoprofile such low PSA concentration using a lectin patterned biosensor device. The biosensor offers a recovery index of 108%, when serum sample was spiked with a physiological concentration of PSA (3.5 ng mL-1).

Center for Advanced Materials Qatar University P O Box 2713 Doha Qatar

Institute of Chemistry Slovak Academy of Sciences Dubravska cesta 9 Bratislava 845 38 Slovak Republic

Institute of Chemistry Slovak Academy of Sciences Dubravska cesta 9 Bratislava 845 38 Slovak Republic; Glycanostics Ltd Dubravska cesta 9 Bratislava 845 38 Slovak Republic

Institute of Physics of the Czech Academy of Sciences Cukrovarnicka 10 112 Prague 162 00 Czech Republic

Polymer Institute Slovak Academy of Sciences Dubravska cesta 9 Bratislava 845 41 Slovak Republic

Private Urological Ambulance Piaristicka 6 Trencin 911 01 Slovak Republic

St Elisabeth Cancer Institute Heydukova 10 Bratislava 812 50 Slovak Republic

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Validating fPSA Glycoprofile as a Prostate Cancer Biomarker to Avoid Unnecessary Biopsies and Re-Biopsies

Synthesis and characterization of Au nanoshells with a magnetic core and betaine derivatives