An electrochemical sensor based on double-network magnetic conductive hydrogel and a method for detecting carmine red by using the same

Abstract

The application discloses an electrochemical sensor based on a double-network magnetic conductive hydrogel and a method for detecting carmine by using the same. Cationic guar gum and Fe3O4@COOH-MWCNTs are dispersed in an acetic acid solution, heated and stirred until the cationic guar gum is dissolved to obtain a mixture; an aqueous dispersion of beta-CD and MBA is added to the mixture, heated and stirred until a hydrogel is formed to obtain a double-network magnetic conductive hydrogel MCHG; the MCHG is dropped and coated on a GCE to serve as a working electrode, a saturated calomel electrode serves as a reference electrode, and a platinum electrode serves as an auxiliary electrode to obtain the electrochemical sensor. The application introduces Fe3O4@COOH-MWCNTs into a hydrogel (HG) to prepare a novel double-network magnetic conductive hydrogel, which can not only overcome the limitations of traditional hydrogels in electrochemical applications (improve the sensitivity of the electrochemical sensor), but also can serve as a crosslinking agent to improve the uniformity of the MCHG.

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