Entity

Time filter

Source Type


Xu Z.,Jiangnan University | Ding L.,Hunan Entry Exit Inspection and Quarantine Bureau of the Peoples Republic of China | Long Y.,Guangdong Entry Exit Inspection and Quarantine Bureau of the Peoples Republic of China | Xu L.,Jiangnan University | And 2 more authors.
Analytical Methods | Year: 2011

Molecularly imprinted polymer (MIP) coated Fe3O4 nanoparticles (Fe3O4@MIP) were synthesized by atom transfer radical polymerization (ATRP) and used as highly selective magnetic solid-phase extraction (MSPE) sorbents for trace bisphenol A (BPA) from packed food. The morphological and polymeric characteristics of the Fe 3O4@MIP were characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. In this work, competitive recognition compounds (4-n-octylphenol and bisphenol A diglycidyl ether) exhibited lower binding capability to the Fe3O4@MIP than BPA. A high performance liquid chromatography with fluorescence detection (HPLC-FLD) method was developed for the determination of BPA in canned orange and milk samples. The main factors influencing the extraction efficiency, including high specificity, the amount of surfactant, the shaking time and the desorption ability of complex food matrices were investigated and optimized. Various parameters such as the pH of thesample, the amount of Fe 3O4@MIP sorbent, the extraction time, and the desorption conditions were optimized. Notably, the extraction can be carried out quickly, and the extraction time for BPA onto Fe3O4@MIP sorbents can be clearly shortened to 5 min. Good linearities (r2 > 0.9965) for all calibration curves were obtained, and the limit of detection (LOD) for BPA was 0.1 and 0.3 ng mL-1 in canned orange and milk samples, respectively. To the best of our knowledge, this is the first time that surface molecularly imprinted polymer nanoparticles have been used for the pretreatment of packed food. © The Royal Society of Chemistry 2011. Source


Jiao Y.,Hunan Entry Exit Inspection and Quarantine Bureau of the Peoples Republic of China | Jiao Y.,University of Sichuan | Ding L.,Hunan Entry Exit Inspection and Quarantine Bureau of the Peoples Republic of China | Fu S.,Hunan Entry Exit Inspection and Quarantine Bureau of the Peoples Republic of China | And 3 more authors.
Analytical Methods | Year: 2012

The magnetic multiwalled carbon nanotube (MWCNT-MNP) was successfully synthesized. MWCNT-MNP and gas chromatography-tandem mass spectrometry (GC-MS/MS) were used for rapid, simple and reliable determination of bisphenol A (BPA), bisphenol F (BPF), bisphenol F diglycidyl ether (BFDGE) and bisphenol A diglycidyl ether (BADGE) at trace levels in water. The major factors affecting the recovery efficiency, such as amount of MWCNT-MNP, pH of water sample and sample volume, were carefully investigated. The recovery of these compounds was in the range of 88.5-115.1% with relative standard deviation less than 10%. Good linearities (r 2 > 0.995) were obtained. The limits of detection for BPA, BPF, BFDGE and BADGE were 0.001, 0.002, 0.06, and 0.05 μg L -1, respectively. Finally, the method was applied to tap water, river water and snow water, the results show that the developed method is suitable for monitoring trace BPA, BPF, and their diglycidyl ethers in environmental water samples. © 2012 The Royal Society of Chemistry. Source


Jiao Y.,University of Sichuan | Fu S.,Hunan Entry Exit Inspection and Quarantine Bureau of the Peoples Republic of China | Ding L.,Hunan Entry Exit Inspection and Quarantine Bureau of the Peoples Republic of China | Gong Q.,Hunan Entry Exit Inspection and Quarantine Bureau of the Peoples Republic of China | And 3 more authors.
Analytical Methods | Year: 2012

A magnetic solid phase extraction method coupled to gas chromatography-tandem mass spectrometry was proposed for the determination of phthalate esters at trace levels in drinking water. The magnetic multi-walled carbon nanotubes were prepared and applied as sorbents for magnetic solid phase extraction. The major factors affecting the recovery efficiency, such as the amount of magnetic multi-walled carbon nanotubes, pH of the water sample, desorption conditions and extracting time were carefully investigated. The recovery of these compounds was in the range of 86.6-100.2% with a relative standard deviation (RSD) value of less than 10%. Good linearities (r > 0.9993) were obtained. The limits of detection for phthalate esters were in the range of 0.009-0.032 μg L -1. The results show that the developed method is suitable for the monitoring of trace phthalate esters in drinking water samples. This journal is © The Royal Society of Chemistry 2012. Source

Discover hidden collaborations