Magnetic amino‐functionalized hollow silica‐titania microsphere as an efficient sorbent for extraction of pesticides in green and roasted coffee beans

Abstract

This study describes the synthesis and application of a magnetic amino-functionalized hollow silica-titania microsphere as a new sorbent for magnetic dispersive microsolid phase extraction of selected pesticides in coffee bean samples. The sorbent was fully characterized by Fourier-transform infrared spectroscopy, field emission scanning electron microscopy, transition electron microscopy, energy-dispersive X-ray spectroscopy, and vibrating sample magnetometry techniques. Significant extraction parameters affecting the proposed method, such as extraction time, sorbent amount, sample solution pH, salt amount, and desorption conditions (desorption solvent and time) were investigated and optimized. All the figures of merits were validated in coffee bean samples under the matrix-matched calibration method. Linear dynamic ranges were 5-250 μg/kg with the determination coefficients (R 2 ) > 0.9980. The limits of detection for the pesticides of chlorpyrifos, malathion, hexaconazole, and atrazine were 1.42, 1.43, 1.35, and 1.33 μg/kg, respectively. Finally, the method was successfully applied for the determination of the pesticides in green and roasted coffee bean samples, and the obtained recoveries were in the range of 74-113% for spiked samples.The prepared sorbent could be used for the magnetic dispersive micro-solid phase extraction of pesticides in the plant-derived food matrix. K E Y W O R D Scoffee beans, hollow silica-titania microspheres, magnetic solid phase extraction, pesticides for chlorpyrifos, 50 μg/kg for hexaconazole, and 100 μg/kg for atrazine in coffee beans [3]. Capillary GC and HPLC are the most widely used techniques for pesticide analysis [4]. Before instrumental

A review on the pesticides in coffee: Usage, health effects, detection, and mitigation

“…In this regard, it could be used for the extraction step when analyzing pesticides. A recent study in 2020 illustrates the synthesis and implementation of a magnetic amino-functionalized hollow silica-titania microsphere (SiO2-TiO2- NH2@Fe3O4), identified as the sorbent for magnetic dispersive micro-solid phase extraction (MD-μ-SPE) of four pesticides in coffee bean samples ( 55 ). The structure of the sorbent was characterized by Fourier infrared spectroscopy, field emission scanning electron microscopy, transition electron microscopy, energy-dispersive X-ray spectroscopy, and vibrating sample magnetometer procedures.…”