Development of a disposable paper-based potentiometric immunosensor for real-time detection of a foodborne pathogen

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Silva, NFD (Author) Other; Almeida, CMR (Author) Other; Magalhaes, JMCS (Author) Other; Maria do Pilar Gonçalves (Author) FEUP; Cristina Freire (Author) FCUP; Delerue Matos, C (Author) Other

Journal

Title: Biosensors and Bioelectronics

Vol. 141

ISSN: 0956-5663

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 34 Citations

Scopus - 36 Citations

Other information

Authenticus ID: P-00Q-QE1

DOI: 10.1016/j.bios.2019.111317

Abstract (EN): This work reports a new paper-based sensing platform and its application in a label-free potentiometric immunosensor for Salmonella typhimurium detection based on the blocking surface principle. A paper-based strip electrode was integrated with a filter paper pad which acted as a reservoir of the internal solution. The design offers a convenient platform for antibody immobilization and sampling, proving also that is a simple and affordable methodology to control an ionic flux through a polymer membrane. Two different immunosensing interfaces were assembled on the developed paper-strip electrode. The simplest interface relied on direct conjugation of the antibody to the polymer membrane and the second one resorted to an intermediate layer of a polyamidoamine dendrimer, with an ethylenediamine core from the fourth generation. Electrochemical impedance spectroscopy was used to assess the successive interface modification steps and the resulting analytical performance of both immunosensors was compared. For such, the potential shift derived from the blocking effect of the ionic flux caused by antigen-antibody conjugation was correlated with the logarithm of the Salmonella typhimurium concentration in the sample. In optimized conditions, a limit of detection of 5 cells mL(-1) was achieved. As a proof-of-concept, the proposed method was applied to apple juice samples, demonstrating to be a suitable prototype to be used in real scenarios in useful time ( < 1 h assay).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8