Room temperature intercalated poly(diallyldimethylammonium chloride)@montmorillonite as an ultrasensitive mangiferin electrochemical sensor component

A high cationic density polymer (poly(diallyldimethylammonium chloride)) intercalated montmorillonite (PDDA@Mt) was prepared at room temperature and employed as an electrode modifier for the sensitive electrochemical determination of the bioactive molecule mangiferin. X-ray diffraction analysis (XRD) analysis showed an increase in d-spacing from 1.34 nm in Na ⁺-Mt to 1.49 nm in PDDA@Mt, thus ascertaining successful intercalation. A significant charge transfer resistance drop was noted when PDDA@Mt was used as an electrode modifier. Under optimum experimental conditions, the peak current of mangiferin varied linearly with concentration in the range from 1 to 2591.1 nM. From the slope of the calibration curve and the blank standard deviation, a detection limit of 0.63 nM was found (3 S/N). The developed methodology was successfully applied to the electrochemical sensing of mangiferin in the presence of some potential organic interferent species. The results herein show that room temperature intercalated clays could be cost-effective and less energy demanding electrochemical sensor components.