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Rapid and simultaneous determination of tetrabromobisphenol A and hexabromocyclododecane diastereoisomers in soil by matrix solid-phase dispersion with bamboo charcoal as dispersive adsorbent

Yuan J. P., Cui Z. J., Cheng C. G., Wang X. L., Wang S. S., Song X. L., Li F. W.

Acta Chromatographica

2017

Vol. 29, no. 4

487--492

A rapid and simple analytical method based on matrix solid-phase dispersion combined with liquid chromatography coupled with tandem mass spectrometry has been developed by using bamboo charcoal as a dispersive adsorbent to simultaneously determine tetrabromobisphenol A (TBBPA) and hexabromocyclododecane diastereoisomers (HBCDs) in soil. The factors influencing the performance of the proposed method were investigated and optimized in detail, and the matrix effects were evaluated. Under optimum conditions, the proposed method showed good linearity within the range of 0.8–80 ng g−1 and limits of detection of 4–75 pg g−1 (S/N = 3). The satisfactory recoveries of TBBPA ranging from 72.8% to 92.5% and HBCDs ranging from 76.8% to 102.2% were obtained with relatively standard deviation (RSD) ranging from 3.4% to 9.8%. The proposed method has been successfully applied to analyze TBBPA and HBCDs in actual soil samples from the Yellow River Delta in China.

Synthesis, Spectral Characteristics and Antitumor Activity of Tungstosilicic Polyoxometalate Containing 5-Fluorouracil

Feng C. G., Wang S. S., Liu X.

Polish Journal of Chemistry

2009

Vol. 83, nr 12

2079-2087

A novel polyoxometalate com pound with 5-fluorouracil C4H4FN2O2H3SiW12O40ź12H2O (FSW) was synthesized and its structure was analyzed using IR spectra, X-ray powder diffraction (XRD), 183W NMR and TG. IR spectra and XRD indicate that FSW has a Keggin structure of heteropolyanion with a ring structure of 5-fluorouracil as expected. It was found by the analysis of the 183W NMR spectra that the W atoms of FSW remain in the same chemical environment. The results of TG show that the compound has two weight-losing steps with certain degree of thermal stability. The present study uses 5-fluorouracil as the positive control group in the cytotoxicity tests of FSW on human renal embryonic cell HEK293 and the antitumor activity tests in cervical cancer cell Hela using the methyl thiazolyl tetrazolium method. The results obtained show that the therapeutic index of the new polyoxometalate compound is 0.75, higher than that of 5-fluoro-uracil.