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Please use this identifier to cite or link to this item: http://hdl.handle.net/10651/44483

Title: Double-chained cationic surfactant modification of SU-8/Pyrex® microchips for electrochemical sensing of carboxylic ferrocene after reverse electrophoresis
Author(s): Alonso Bartolomé, Rebeca
González López, Andrea
Fernández Abedul, María Teresa
Keywords: Ferrocene carboxylic acid
Microchip electrophoresis
Electrochemical detection
DDAB surfactant
Issue date: 2018
Publisher version: http://dx.doi.org/10.1016/j.snb.2017.08.012
Citation: Sensors and Actuators B: Chemical, 255, p. 490–497 (2018); doi:10.1016/j.snb.2017.08.012
Format extent: p. 490–497
Abstract: This paper describes the effect ofthe modification of microchip microchannels with two different cationic surfactants on the electrochemical behavior of ferrocene carboxylic acid (FCA), common redoxprobe in bioanalysis. Cetyltrimethylammonium bromide (CTAB), a single-chain surfactant, and didecyldimethylammonium bromide (DDAB), double-chained, were evaluated. The purpose was to obtain a reversal of the electroosmotic flow for allowing precise determination of FCA, an anionic probe that is employed in electrochemical bioassays. Although this was possible in both cases, modification of the microchannel with a high concentration of CTAB produced a differentiation between the free CTAB fraction and the CTAB-combined FCA. DDAB is presented as a good alternative for this modification because this doublechained cationic surfactant forms a more stable quasi-permanent coating on the microchannel surface, avoiding these surfactant-probe interactions. Linear relationship was found between the analytical signal and the concentration of FCA (evaluated between 10 and 150 M) for a modification with 0.1 mM of DDAB
URI: http://hdl.handle.net/10651/44483
ISSN: 0925-4005
Sponsored: This work has been supported by MICINN under projects CTQ2011-25814 and by the Asturias Government with funds from PCTI 2006–2009, cofunded with FEDER funds (Programa Operativo FEDER del Principado de Asturias 2007–2013) under project FC-11-PC10-30
Project id.: MICINN/CTQ2011-25814
PCTI 2006–2009
FC-11-PC10-30
Appears in Collections:Química Física y Analítica
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