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Gold screen-printed-based impedimetric immunobiosensors for direct and sensitive Escherichia coli quantisation.
Biosens Bioelectron. 2009 Jul 15; 24(11):3365-71.BB

Abstract

Label-free electrochemical impedance immunosensors for the detection and quantification of Escherichia coli (E. coli) using self-assembled monolayers (SAMs)-modified gold screen-printed electrodes (AuSPEs) were developed. Two different immunosensor configurations were tested and compared. In the first one, the immunosensing design was based on the covalent immobilization of anti-E. coli at AuSPEs using the homobifunctional cross-linker 3,3'-dithiobis[sulfosuccinimidylpropionate] (DTSSP). The other one was based on the immobilization of the thiolated antibody onto the electrode surface. In both cases, the evaluation of the developed immunosensors performance was accomplished through the monitoring of the electron-transfer resistance detected by electrochemical impedance spectroscopy (EIS) in the presence of [Fe(CN)(6)(3-)]/[Fe(CN)(6)(4-)] as redox probe. The configuration using the thiolated antibodies gave rise to a better analytical performance, exhibiting a linear relationship between the increment in the electron-transfer resistance (DeltaR(et)) and the logarithmic value of the E. coli concentration in the 5-1.0 x 10(8) cfu mL(-1) range. The limit of detection achieved, with no need for preconcentration or pre-enrichment steps was 3.3 cfu mL(-1). The developed immunosensors showed a high selectivity against Staphylococcus aureus (S. aureus) and Salmonella choleraesuis (S. choleraesuis). The usefulness of the thiolated antibodies-based design for the rapid analysis (1h) of 10 cfu mL(-1)E. coli inoculated river and tap water samples was demonstrated.

Authors+Show Affiliations

Departamento Química Analítica, Facultad de CC. Químicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19481924

Citation

Escamilla-Gómez, Vanessa, et al. "Gold Screen-printed-based Impedimetric Immunobiosensors for Direct and Sensitive Escherichia Coli Quantisation." Biosensors & Bioelectronics, vol. 24, no. 11, 2009, pp. 3365-71.
Escamilla-Gómez V, Campuzano S, Pedrero M, et al. Gold screen-printed-based impedimetric immunobiosensors for direct and sensitive Escherichia coli quantisation. Biosens Bioelectron. 2009;24(11):3365-71.
Escamilla-Gómez, V., Campuzano, S., Pedrero, M., & Pingarrón, J. M. (2009). Gold screen-printed-based impedimetric immunobiosensors for direct and sensitive Escherichia coli quantisation. Biosensors & Bioelectronics, 24(11), 3365-71. https://doi.org/10.1016/j.bios.2009.04.047
Escamilla-Gómez V, et al. Gold Screen-printed-based Impedimetric Immunobiosensors for Direct and Sensitive Escherichia Coli Quantisation. Biosens Bioelectron. 2009 Jul 15;24(11):3365-71. PubMed PMID: 19481924.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Gold screen-printed-based impedimetric immunobiosensors for direct and sensitive Escherichia coli quantisation. AU - Escamilla-Gómez,Vanessa, AU - Campuzano,Susana, AU - Pedrero,María, AU - Pingarrón,José M, Y1 - 2009/05/07/ PY - 2009/03/06/received PY - 2009/04/20/revised PY - 2009/04/30/accepted PY - 2009/6/2/entrez PY - 2009/6/2/pubmed PY - 2009/8/20/medline SP - 3365 EP - 71 JF - Biosensors & bioelectronics JO - Biosens Bioelectron VL - 24 IS - 11 N2 - Label-free electrochemical impedance immunosensors for the detection and quantification of Escherichia coli (E. coli) using self-assembled monolayers (SAMs)-modified gold screen-printed electrodes (AuSPEs) were developed. Two different immunosensor configurations were tested and compared. In the first one, the immunosensing design was based on the covalent immobilization of anti-E. coli at AuSPEs using the homobifunctional cross-linker 3,3'-dithiobis[sulfosuccinimidylpropionate] (DTSSP). The other one was based on the immobilization of the thiolated antibody onto the electrode surface. In both cases, the evaluation of the developed immunosensors performance was accomplished through the monitoring of the electron-transfer resistance detected by electrochemical impedance spectroscopy (EIS) in the presence of [Fe(CN)(6)(3-)]/[Fe(CN)(6)(4-)] as redox probe. The configuration using the thiolated antibodies gave rise to a better analytical performance, exhibiting a linear relationship between the increment in the electron-transfer resistance (DeltaR(et)) and the logarithmic value of the E. coli concentration in the 5-1.0 x 10(8) cfu mL(-1) range. The limit of detection achieved, with no need for preconcentration or pre-enrichment steps was 3.3 cfu mL(-1). The developed immunosensors showed a high selectivity against Staphylococcus aureus (S. aureus) and Salmonella choleraesuis (S. choleraesuis). The usefulness of the thiolated antibodies-based design for the rapid analysis (1h) of 10 cfu mL(-1)E. coli inoculated river and tap water samples was demonstrated. SN - 1873-4235 UR - https://www.unboundmedicine.com/medline/citation/19481924/Gold_screen_printed_based_impedimetric_immunobiosensors_for_direct_and_sensitive_Escherichia_coli_quantisation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0956-5663(09)00244-9 DB - PRIME DP - Unbound Medicine ER -