Chemical Methodologies

Fe3O4@SiO2@Mel-Rh-Cu: A High-Performance, Green Catalyst for Efficient Xanthene Synthesis and Its Application for Magnetic Solid Phase Extraction of Diazinon Followed by Its Determination through HPLC-UV

Sahar Peiman; Behrooz Maleki; Milad Ghani

Volume 8, Issue 4 , April 2024, , Pages 257-278

https://doi.org/10.48309/chemm.2024.442693.1767

Abstract

A novel, high-performance, recyclable heterogeneous catalyst functionalized with melamine was advantageously prepared and rhodanine on magnetic silica was successfully carried out. ... Read More A novel, high-performance, recyclable heterogeneous catalyst functionalized with melamine was advantageously prepared and rhodanine on magnetic silica was successfully carried out. After that, the Cu ions were coordinated with the existing ligands decorated on the magnetic silica surface. This catalyst was identified by different analyses and acted as a recoverable catalyst for xanthene synthesis. Its advantages include the solvent-free conditions of the reaction, the high efficiency of the products in a short period of time, as well as its simple collection from the reaction environment. Moreover, the prepared sorbent has been developed for the extraction of diazinon from different real samples through magnetic solid phase extraction (MSPE). Under optimal conditions, the linear range for measuring diazinon was 0.5-200 µg L-1. The coefficient of determination (R2) was 0.9985. The limit of detection (LOD) of the method was 0.08 μg L-1. Relative standard deviation values (RSD%) for the concentration of 10.0 μg L-1 and 100 μg L-1 were between 5.3% and 5.9%. Finally, the proposed method was used to determine diazinon in orange and agricultural water. The results showed that the percentage of relative recovery of the selected toxin in the studied real samples was between 92 and 105.Moreover, the prepared sorbent has been developed for the extraction of diazinon from different real samples through magnetic solid phase extraction (MSPE). The parameters affecting the extraction were optimized by response surface methodology (RSM). The optimal extraction conditions were 15 min for contact time, 7 mg for sorbent amount, and 0% (w/v) for NaCl concentration.Moreover, 20 µL of methanol was used to elute the extracted analyte. Under optimal conditions, the linear range for measuring diazinon was 0.5-200 µg L-1. The coefficient of determination (R2) was 0.9985. The limit of detection (LOD) of the method was 0.08 μg L-1. Relative standard deviation values (RSD%) for the concentration of 10.0 μg L-1 and 100 μg L-1 were between 5.3% and 5.9%. Finally, the proposed method was used to determine diazinon in orange and agricultural water. The results showed that the percentage of relative recovery of the selected toxin in the studied real samples was between 92 and 105.

Pre-concentration and Sensitive Determination of Propranolol and Metoprolol Using Dispersive Solid-Phase Microextraction and High-Performance Liquid Chromatography in Biological, Wastewater, and Pharmaceutical Samples

Bagher Farhadi; Mahmoud Ebrahimi; Ali Morsali

Volume 6, Issue 10 , October 2022, , Pages 750-761

https://doi.org/10.22034/chemm.2022.317197.1401

Abstract

Determination of drugs at environmental and biological samples is a critical issue for controlling the effects of a drug on human health and environmental pollution. In the present ... Read More

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Keywords = Magnetic nanoparticles

Fe3O4@SiO2@Mel-Rh-Cu: A High-Performance, Green Catalyst for Efficient Xanthene Synthesis and Its Application for Magnetic Solid Phase Extraction of Diazinon Followed by Its Determination through HPLC-UV

Abstract

Pre-concentration and Sensitive Determination of Propranolol and Metoprolol Using Dispersive Solid-Phase Microextraction and High-Performance Liquid Chromatography in Biological, Wastewater, and Pharmaceutical Samples

Abstract