2026-04-20T19:35:55Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/53372022-04-08T07:52:59Zcom_10259_3844com_10259_5086com_10259_2604col_10259_3845

Hernández Muñoz, Sheila Perales Rondon, Juan Víctor Heras Vidaurre, Aránzazu Colina Santamaría, Álvaro 2020-06-10T10:27:06Z 2020-06-10T10:27:06Z 2020-02 0013-4686 http://hdl.handle.net/10259/5337 10.1016/j.electacta.2019.135561 In the present work, a new methodology which combines two different phenomena to enhance the Raman signal is used to resolve a mixture of two compounds with similar molecular structures. The use of Raman spectroelectrochemistry (Raman-SEC) allows us to collect simultaneously, with high time-resolution, the enhancement of the Raman signal of the compounds present in a sample during the electrochemical oxidation-reduction cycle (ORC) of a silver screen-printed electrode. During such ORC two different phenomena appears depending on the stage of the electrochemical modification of the silver substrate, which are known as electrochemical surface enhanced Raman scattering (EC-SERS) and electrochemical surface oxidation enhanced Raman scattering (EC-SOERS). This work is a proof of concept that demonstrates the advantage of using EC-SOERS and EC-SERS in a single experiment to resolve mixtures of similar molecules such as vitamin B3, which components are nicotinic acid and nicotinamide. Although the interaction between analytes and substrates influence a univariate calibration, the trilinear character of Raman-SEC makes possible to deconvolve such interactions and provide a good calibration curve for both, nicotinic acid and nicotinamide. Ministerio de Economía y Competitividad (Grants CTQ2017-83935-R-AEI/FEDERUE), Junta de Castilla y León (Grant BU033-U16 and BU297P18) and Ministerio de Ciencia, Innovación y Universidades (RED2018-102412-T). J.V.P-R. thanks JCyL for his postdoctoral fellowship (Grant BU033-U16) application/pdf eng Elsevier Electrochimica Acta. 2020, V. 334, 135561 https://doi.org/10.1016/j.electacta.2019.135561 info:eu-repo/grantAgreement/JCyL/BU297P18 info:eu-repo/grantAgreement/MINECO/CTQ2017-83935-R info:eu-repo/grantAgreement/MICINN/RED2018-102412-T Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess EC-SERS EC-SOERS Raman spectroelectrochemistry Nicotinic acid Nicotinamide Química analítica Chemistry, Analytic Electrochemical SERS and SOERS in a single experiment: A new methodology for quantitative analysis info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Electrochimica Acta 334 135561