Separation/Analysis of Congo Red by Using Poly (Ionic Liquid) Immobilized Magnetic Nanoparticles Magnetic Solid Phase Extraction Coupled with Fluorescence Spectrophotometry

Abstract

Magnetic solid phase extraction (MSPE) accompanied with fluorescence spectrophotometry using Poly (ionic liquid) immobilized magnetic nanoparticles (PIL-MNPs) as sorbent was introduced for Congo red analysis in food. Poly (1-vinyl-3-butylimidazolium) bromide immobilized (MNPs) were prepared through co-polymerization of 1-vinyl-3-hexylimidazolium-based ionic liquid and vinyl-modified magnetic particles. Some of different types of parameters, such as pH value, adsorption temperature and time, sample volume, eluent type, were studied. Under the optimum conditions, the preconcentration factor for AR was 27. The linear range, detection limit (DL), correlation coefficient (R) and relative standard deviation (RSD) were found to be 0.10-9.00µg/mL, 5.2µg/L, 0.9987 and 3.10% (n=3, c=4.00µg/mL). This method had been successfully applied to the separation / analysis of Congo red in real samples.

Construction and characterization of a magnetic nanoparticle-supported Cu complex: a stable and active nanocatalyst for synthesis of heteroaryl-aryl and di-heteroaryl sulfides

“…64,65 Consistent with literature reports, the TGA curve for bare Fe 3 O 4 tends to stabilize above 200 °C, denoting the completion of primary thermal events. 65–67 The residual mass signifies the presence of remaining iron oxide products or any inert material within the sample. 68,69 Notably, the TGA analysis of the Fe 3 O 4 @AMBA-CuI nanocatalyst revealed an additional substantial weight loss between 225 and 600 °C.…”