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Wei Y.,Chinese Academy of Agricultural Sciences | Wei Y.,Risk Assessment Laboratory for Bee Products Quality and Safety | Chen F.,Chinese Academy of Agricultural Sciences | Chen F.,Risk Assessment Laboratory for Bee Products Quality and Safety | And 13 more authors.
Current Analytical Chemistry | Year: 2016

Background: Bee pollen, a type of floristic pollen collected by honeybees, is extracted at the hive entrance using a pollen trap, and had mixed with saliva and gland secretions. Considering its natural origin, pollen may be contaminated with pollutants due to hidden environmental factors and extensive application of pesticides. Because of their environmental persistence and prevalence in various environmental mediums, POPs can be encountered by forage bees and carried back to hives. The aim of the present study was to develop an analytical method for simultaneous determination of trace levels of 16 PAHs, 14 OCPs and 7 PCBs in bee pollen. Methods: A new method was developed using QuEChERS/GC-MS. For the initial extraction step, QuEChERS Extract Tubes based on the AOAC method for the acetate-buffered version were used. The following tubes were used for the subsequent cleanup step: dispersive tubes. Results: Recoveries of target analytes under optimized conditions ranged from 51.3% to 138.8%. Limits of detection and limits of quantification were lesser or equal to 5.8 and 19.2 µg/kg, respectively. The correlation coefficients of 37 target analytes were higher than 0.99. This study lays the foundation for the further research into bee pollen as an environmental indicator. Conclusion: The method is simple, economical, effective and robust for simultaneous analysis of 37 kinds of POPs in bee pollen matrix. The degree of environmental pollution could be evaluated by analyzing the pollutants in bee pollen samples. This study lays the foundation for the further research into bee pollen as an environmental indicator. © 2016 Bentham Science Publishers.


Zhao L.,China Agricultural University | Zhang L.,China Agricultural University | Liu F.,China Agricultural University | Xue X.,Chinese Academy of Agricultural Sciences | And 2 more authors.
Journal of Separation Science | Year: 2014

Although jujube is a minor crop and very few pesticides are registered on it, the application of pesticides during the growth stage of jujube is inevitable to control the pests or diseases. This situation has led to pesticide misuse. A modified quick, easy, cheap, effective, rugged, and safe method using a novel sorbent, multiwalled carbon nanotubes, as a dispersive solid-phase extraction sorbent combined with gas chromatography with mass spectrometry, was developed for the determination of 16 pesticides in jujube. Under the optimized conditions, recoveries of 76.7-112.4% were obtained for the target analytes at three spiked concentration levels. The relative standard deviations ranged from 1.2 to 12.3%. Limits of detection and limits of quantification for 16 pesticides ranged from 1 to 10 and 3 to 30 μg/kg, respectively. The residues of chlorpyrifos, hexaconazole, tebuconazole, and cyhalothrin were detected from samples obtained from the market. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA.


Du B.,Northwest University, China | Du B.,Chinese Academy of Agricultural Sciences | Wu L.,Risk Assessment Laboratory for Bee Products Quality and Safety | Xue X.,Chinese Academy of Agricultural Sciences | And 6 more authors.
Journal of Agricultural and Food Chemistry | Year: 2015

Honey adulteration with sugar syrups is a widespread problem. Several types of syrups have been used in honey adulteration, and there is no available method that can simultaneously detect all of these adulterants. In this study, we generated a small-scale database containing the specific chromatographic and mass spectrometry information on sugar syrup markers and developed a simple, rapid, and effective ultrahigh-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UHPLC/Q-TOF-MS) method for the detection of adulterated honey. Corn syrup, high-fructose corn syrup, inverted syrup, and rice syrup were used as honey adulterants; polysaccharides, difructose anhydrides, and 2-acetylfuran-3-glucopyranoside were used as detection markers. The presence of 10% sugar syrup in honey could be easily detected in <30 min using the developed method. The results revealed that UHPLC/Q-TOF-MS was simple and rapid. © 2015 American Chemical Society.

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