An Analytical Method Based on Electrochemical Sensor for the Assessment of Insect Infestation in Flour

Abstract

Uric acid is an important indicator of the insect infestation assessment in flour. In this work, we propose a method for uric acid detection based on voltammetry. This technique is particularly considered for the physicochemical properties of flour and contains a simple pretreatment process to rapidly achieve extraction and adsorption of uric acid in flour. To achieve specific recognition of uric acid, graphene and poly(3,4-ethylenedioxythiophene) (PEDOT) were used for the adsorption and concentration of uric acid in flour. The adsorbed mixture was immobilized on the surface of a screen-printed electrode for highly sensitive detection of the uric acid. The results showed that electrocatalytic oxidation of uric acid could be achieved after adsorption by graphene and PEDOT. This electrocatalytic reaction allows its oxidation peak to be distinguished from those of other substances that commonly possess electrochemical activity. This voltammetry-based detection method is a portable and disposable analytical method. Because it is simple to operate, requires no professional training, and is inexpensive, it is a field analysis method that can be promoted.

Advances in Environmentally Friendly Techniques and Circular Economy Approaches for Insect Infestation Management in Stored Rice Grains

“…When sound and infested grains are immersed, the sound ones will sink, while the infested ones will float to the surface. The flotation method has found a good implementation worldwide, and adaptations of this method have been reported to detect insect fragments in bran, fine bran, and flour [23,24]. However, this method is time-consuming, and results are of qualitative but not quantitative value, mainly because the method is most likely to produce an underestimate of the level of infestation present in the sample.…”

Construction of Electrochemical Aptamer Sensor Based on Pt-Coordinated Titanium-Based Porphyrin MOF for Thrombin Detection

“…Especially in electrochemical sensing (Dang et al, 2020;Xue et al, 2020), the porous structure of MOFs facilitates the penetration of electrolyte and can promote the rapid reaction between substrate and electrode (Hatamluyi et al, 2020). The adjustable pore size can facilitate the separation of analytes and thus improve the selectivity of the constructed sensors (Zhou et al, 2019(Zhou et al, , 2020Fu et al, 2021). The porous structure of MOFs leads to their large surface area, which can expose more active sites and help improve the sensitivity of detection (Huang et al, 2020).…”