Determination of Rhodamine B in Food Samples by FeO@ Ionic Liquids-β-Cyclodextrin Cross Linked Polymer Solid Phase Extraction Coupled with Fluorescence Spectrophotometry.

FeO@Ionic liquids β-cyclodextrin polymer(FeO@ mono-6- deoxy-6- (1-ethyl- imidazolium)-β-cyclodextrin iodide polymer, ILs-β-CDCP) was prepared. A novel method based on FeO@ILs-β-CDCP solid phase extraction coupled with fluorescence spectrophotometry for Rhodamine B (RhB) determination, was investigated. Results were shown that RhB was adsorbed on FeO@ILs-β-CDCP and eluted with sodium dodecyl sulfate (SDS) (1.

[Fe₃O₄-β-Cyclodextrin Polymer Nano Composites Solid-Phase Extraction-UV-Vis Spectrophotometry for Separation Analysis Malachite Green].

In this paper, carboxymethyl-hydroxypropyl-β-cyclodextrin polymer modified magnetic particles Fe₃O₄ (CM-HP-β-CD- CP-MNPs) were prepared and applied to magnetic solid phase extraction of malachite green combined with UV-Visible spectrom- etry detection. The synthesized magnetic particles were characterized by element analysis, Fourier transform infrared spectra and transmission electron microscopy. Several variables affecting the extraction and desorption of malachite green such as pH, the amount of adsorbent, the type and volume of eluent, extraction and desorption time, and temperature were investigated.

[Determination of clopidogrel sulfate in pharmaceutical formulation and biological fluids by extraction spectrofluorimetric method].

A simple and sensitive spectrofluorimetric method has been developed for the determination of clopidogrel sulfate in pharmaceutical formulation and human urine/serum. It is based on the formation of ion-pair complex between clopidogrel sulfate and alizarin red in 0.3 mol x L(-1) hydrochloric acid solution.

Ionic liquids functionalized β-cyclodextrin polymer for separation/analysis of magnolol.

Ionic liquids functionalized β-cyclodextrin polymer, a mono-6-deoxy-6-(1,2-dimethylimidazolium)-β-cyclodextrin iodide polymer (ILs-β-CDCP), was synthesized as a solid-phase adsorbent coupled with high-performance liquid chromatography for separating or analyzing magnolol in drug samples. The results showed that magnolol was adsorbed rapidly on ILs-β-CDCP and eluted with methanol. Under the optimum conditions, preconcentration factor of the proposed method was 12.

Determination of epristeride by its quenching effect on the fluorescence of L-tryptophan.

A rapid, novel spectrofluorimetric method to determine epristeride (EP) in biological fluids and a pharmaceutical formulation was developed, based on the fact that fluorescence intensity of l-tryptophan could be quenched by EP in the medium of pH=9.0. The various factors influencing fluorescence quenching were discussed.

[Hydrophobic ionic liquid extraction-flame atomic absorption spectrophotometry for separation/analysis trace gold].

In the present paper, the hydrophobicity ionic liquid 1-butyl-3- methylimidazolium hexafluorophosphate ([C4mim] [PF6]) was synthesized with 1-methylimidazole and butylbromide and equimolar ammonium hexafluorophosphate, which was applied to preconcentration for trace gold. The factors which may affect preconcentration of gold were investigated. The experimental results showed that the absorbance was linear when the concentration of gold was in the range of 0.

[Investigation and application of fluorescence reaction of cerium-L-tryptophan in Triton X-100 microemulsion].

In the present article, the sensitizing effect of Triton X-100 microemulsion media (Triton X-100-M) on the determination of L-tryptophan by fluorescence spectrophotometry was studied, which was based on a strong fluorescence substance produced when L-tryptophan was oxidized by Ce4+ in acid medium. Compared with Triton X-100 micelle (Triton X-100-m), it was found that in the medium of Triton X-100-M the intensity of fluorescence was enhanced by 225 times. Various factors that influence fluorescence determination and interfering ions were examined.