Journal
ANALYTICA CHIMICA ACTA
Volume 1062, Issue -, Pages 87-93Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2019.02.041
Keywords
Cyclodextrins; 6-Ferrocenylhexanthiol; Immunosensor; Avian leucosis viruses
Categories
Funding
- National Natural Science Foundation of China [21505086, 41771342]
- Funds of Shandong Double Tops Program [SYL2017XTTD15]
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A novel sandwich-type electrochemical immunosensor was fabricated for the ultrasensitive detection of avian leukosis virus subgroup J (ALV-J). The immunosensor used a (beta-cyclodextrin-nanogold-ferrocene (beta-CD-AuNP-Fc) host-guest complex as the label and a perylene-3,4,9,10-tetracarboxylic acid functional graphene nanocomposite (GR-PTCA) as the sensor platform. The abundant polycarboxylic sites of GR-PTCA facilitated the binding of primary antibodies (Ab(1)), whilst the excellent electrical conductivity of GR-PTCA promoted electron transfer. Immobilization of beta-CD directly onto secondary antibodies (Ab(2)) via covalent bonding allowed strong binding of ferrocene-decorated gold nanoparticles (Fc-Au NP), thereby amplifying the immunosensor signal. Under optimized testing conditions, the reduction current of ferrocene exhibited a linearly dependence on the ALV-J titer in the concentration range of 10(2.0) -10(4.0) TCID50/mL, with a low detection limit of 10(1.93) TCID50/mL. Furthermore, the immunosensor demonstrated high sensitivity, good reproducibility, reusability and stability, suggesting excellent potential for the quantitative detection of ALV-J in clinical applications. (C) 2019 Elsevier B.V. All rights reserved.
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