Journal Pre-proof Femtomolar direct voltammetric determination of circulating miRNAs in sera of cancer patients using an enzymeless biosensor Mohamed Zouari, Susana Campuzano, José M. Pingarrón, Noureddine Raouafi PII: S0003-2670(20)30034-9 DOI: https://doi.org/10.1016/j.aca.2020.01.016 Reference: ACA 237375 To appear in: Analytica Chimica Acta Received Date: 7 December 2019 Revised Date: 4 January 2020 Accepted Date: 7 January 2020 Please cite this article as: M. Zouari, S. Campuzano, J.M. Pingarrón, N. Raouafi, Femtomolar direct voltammetric determination of circulating miRNAs in sera of cancer patients using an enzymeless biosensor, Analytica Chimica Acta, https://doi.org/10.1016/j.aca.2020.01.016. This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Elsevier B.V. All rights reserved.