A simple architecture with self-assembled monolayers to build immunosensors for detecting the pancreatic cancer biomarker CA19-9

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Soares, Andrey Coatrini ^{[1, 2]} ; Soares, Juliana Coatrini ^[1] ; Shimizu, Flavio Makoto ^{[1, 3]} ; Rodrigues, Valquiria da Cruz ^[1] ; Awan, Iram Taj ^[1] ; Melendez, Matias Eliseo ^[4] ; Oliveira Piazzetta, Maria Helena ^[3] ; Gobbi, Angelo Luiz ^[3] ; Reis, Rui Manuel ^{[5, 4, 6]} ; Fregnani, Jose Humberto T. G. ^[4] ; Carvalho, Andre Lopes ^[4] ; Oliveira, Jr., Osvaldo N. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Inst Phys, Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Mat Engn, Sao Carlos, SP - Brazil

^[3] Brazilian Ctr Res Energy & Mat, Brazilian Nanotechnol Natl Lab, Campinas, SP - Brazil

^[4] Barretos Canc Hosp, Mol Oncol Res Ctr, Barretos - Brazil

^[5] ICVS 3Bs PT Govt Associate Lab, Braga - Portugal

^[6] Univ Minho, Life & Hlth Sci Res Inst ICVS, Sch Hlth Sci, Braga - Portugal

• Tipo de documento: Artigo Científico
• Fonte: ANALYST; v. 143, n. 14, p. 3302-3308, JUL 21 2018.
• Citações Web of Science: 4

Resumo

The challenge of the early diagnosis of pancreatic cancer in routine clinical practice requires low-cost means of detection, and this may be achieved with immunosensors based on electrical or electrochemical principles. In this paper, we report a potentially low-cost immunosensor built with interdigitated gold electrodes coated with a self-assembled monolayer and a layer of anti-CA19-9 antibodies, which is capable of detecting the pancreatic cancer biomarker CA19-9 using electrical impedance spectroscopy. Due to specific, irreversible adsorption of CA19-9 onto its corresponding antibody, according to data from polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS), the immunosensor is highly sensitive and selective. It could detect CA19-9 in commercial samples with a limit of detection of 0.68 U mL(-1), in addition to distinguishing between blood serum samples from patients with different concentrations of CA19-9. Furthermore, by treating the capacitance data with information visualization methods, we were able to verify the selectivity and robustness of the immunosensor with regard to false positives, as the samples containing higher CA19-9 concentrations, including those from tumor cells, could be distinguished from those with possible interferents. (AU)

• Processo FAPESP: 13/14262-7 - Filmes nanoestruturados de materiais de interesse biológico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/15543-7 - Biossensores para detectar Escherichia coli usando o conceito de línguas eletrônicas
• Beneficiário: FLAVIO MAKOTO SHIMIZU
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado