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Supporting information Direct electrochemical stripping detection of cystic fibrosis related DNA linked through cadmium sulphide quantum dots Sergio Marin, Arben Merkoçi* Nanobioelectronics & Biosensors Group, Institut Català de Nanotecnologia, & Department of Chemistry, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Catalonia, Spain * ICREA, Barcelona, Catalonia, Spain * Corresponding author: Tel.: +34-93-586-80-14; fax: +34-93-581-23-79; e-mail: arben.merkoci.icn@uab.es Figure 1S. (A) Optimizations of BSA concentration that was used in the final step of DNA protocol (B) Quantum dots concentration optimization. The experimental conditions are explained in the text. Figure 2S. Square wave voltammograms of (A) the normal assay (34 μg ml-1of CF-T); (B) The blank does not contain the CF-B (C) blank does not contain the CF-T. The experimental conditions are explained in the text. Figure 1S Figure 2S