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

In this paper, carboxymethyl-hydroxypropyl-ß-cyclodextrin polymer modified magnetic particles Fe3O4 (CM-HP-ß-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. Under the optimum conditions, malachite green could be adsorbed by CM-HP-ß-CDCP-MNPs (RE% = 92), and elution by C2H5OH (EE% = 90). the preconcentration factor of the proposed method was approximately 7.5, the CM-HP-ß-CDCP-MNPs could be used repeatedly for 5 times and offered better recovery. The linear range and detection limit (DL) were found to be 0.08~8.00 µg · mL⁻¹ and 5.6 ng · mL⁻¹ respectively. This technique had been successfully applied to the determination of malachite green in real samples. The inclusion interaction of CM-HP--CDCP-MNPs with malachite green was studied through FTIR.

Optimization of ß-cyclodextrin cross-linked polymer for monitoring of quercetin.

A novel method for the separation/analysis of quercetin was described, which was based on the investigation of the inclusion interactions of ß-cyclodextrin cross-linked polymer (ß-CDCP) with quercetin (Qu) and the adsorption behavior of Qu on ß-CDCP. The inclusion interaction of ß-CDCP with Qu was studied through FTIR, TGA and 13C NMR. Under the optimum conditions, the preconcentration factor of the proposed method was approximately 8.8, the ß-CDCP could be used repeatedly for 30 times and offered better recovery. The linear range, limit of detection (LOD) and the relative standard deviation (RSD) was found to be 0.10-12.0 µg mL(-1), 4.6 ng mL(-1) and 3.10% (n=3, c=2.0 µg mL(-1)) respectively. This technique had been successfully applied to the determination of Qu in real samples.

Cyclodextrin polymer/Fe3O4 nanocomposites as solid phase extraction material coupled with UV-vis spectrometry for the analysis of rutin.

In this paper, carboxymethyl-hydroxypropyl-ß-cyclodextrin polymer modified magnetic particles Fe3O4 (CM-HP-ß-CDCP-MNPs) were prepared and applied to magnetic solid phase extraction of rutin combined with UV-visible spectrometry detection. The synthesized magnetic particles were characterized by element analysis, Fourier transform infrared spectra, thermal gravimetric analysis, and transmission electron microscopy. Several variables affecting the extraction and desorption of rutin such as pH, the amount of adsorbent, the type and volume of eluent, extraction and desorption time, and temperature were investigated. The maximum adsorption capacity was 67.0 mg g(-1) for rutin with the equilibrium time of 30 min at room temperature, and the adsorbent could be reused for 10 times. A calibration curve was linear in the range of 0.05-8.00 µg mL(-1) with a relative standard deviation of 2.9% (n=5, c=4.0 µg mL(-1)). The limit of detection was 7.0 ng mL(-1). The interaction mechanism between the adsorbent and rutin was also studied. Feasibility of this method was validated by the analysis of rutin tablets and lotus plumule.