Electroanalytical Application of Amine‐grafted Attapulgite to the Sensitive Quantification of the Bioactive Compound Mangiferin

Abstract

A glassy carbon electrode (GCE) coated with a thin film of organoattapulgite was used for the voltammetric detection and quantification of mangiferin (MG), a bioactive xanthone with several therapeutic properties. The used modified attapulgite was prepared by surface grafting of [3‐(2‐aminoethylamino)propyl]trimethoxysilane. The grafted clay was characterised by SEM, CHN elemental analysis, FTIR spectroscopy and XRD techniques. The electrochemical behaviour of MG was first investigated on bare GCE by cyclic voltammetry which showed a single irreversible oxidation peak at ca 0.770 V (vs Ag/AgCl) in HCl/KCl buffer at pH 1. When the GCE was covered by the organoattapulgite, the electrode response for MG increased significantly due to favourable electrostatic interactions between MG and the protonated organoclay. A sensitive voltammetric method for the determination of MG, based on adsorptive stripping voltammetry was then developed. A linear variation of MG concentration with peak current was obtained in the range from 0.61 to 10.57 μM, with a detection limit of 2.75×10−7 M (S/N=3). Kinetic and chronocoulometric studies were also performed to characterise the diffusion of MG at the organoclay modified electrode. The interfering effect of some compounds likely to affect the stripping signal of MG was also evaluated, followed by the application of the developed method to a real biological sample.

Subnanomolar electrochemical sensing of mangiferin using a polycationic organohalloysite as electrode modifier

“…The peak position is same at all three electrodes. This is different from the electrochemical behaviour of MG in the same medium at an amine-grafted attapulgite modified electrode observed by Tchieno et al [20]. This is prove that the peak current increase observed at CPE/H and CPE/H-polyQ 22 ( respectively).…”

Montmorillonite clay-modified disposable ink-jet-printed graphene electrode as a sensitive voltammetric sensor for the determination of cadmium(II) and lead(II)

“…Thus, chemically modified electrodes (CMEs) represent one of the main areas of electrochemistry research with many applications including analytical chemistry [13,14], solar energy conversion [15,16], electrochromic display devices [17] and molecular electronic devices [18]. In the analytical field, different types of conductive materials were used to develop CMEs: polymers [19,20], mesoporous silicate films [21,22], nanoparticles [23] and clay minerals [9,[24][25][26][27]. Clay-modified electrodes have distinct advantages over conventional electrodes in many areas of application, such as electrocatalysis, electrochemical sensors and preconcentration electroanalysis.…”

Fabrication of a pH-Responsively Controlled-Release Pesticide Using an Attapulgite-Based Hydrogel

“…Attapulgite (ATP), a hydrated magnesium aluminum silicate, possessed a unique fibrous morphology. , Additionally, ATP displayed advantages of low cost, large storage, environmentally friendly property, and thus was widely used in water treatment, painting, sensor, and carrier. − In the past few decades, ATP and organically modified ATP were used as carriers for slow release pesticides mainly through adsorption . In our previous work, ATP with nano networks structure was used as a carrier to increase the adhesion ability of pesticide on crop leaf surface and thus reduce the migration and loss. , However, these prepared ATP–pesticide systems could not respond to external stimulus (pH, temperature, light and so on) and thus lacked controlled-release property.…”