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Zhu J.,Zhejiang Academy of Science and Technology for Inspection and Quarantine | Wang C.,Zhejiang Academy of Science and Technology for Inspection and Quarantine
Xiandai Huagong/Modern Chemical Industry | Year: 2013

The industrial gas hazards are reviewed. The hazardous classification on the industrial gas package and transport in the United Nations Recommendations on the transport of dangerous goods model regulations (TDG) is researched. On this basis, an correct classification idea of industrial gas samples is proposed. The hazards of industrial gas samples are classified according to the proposed idea and the TDG criterion ultimately. Source


Hou J.-B.,Zhejiang Academy of Science and Technology for Inspection and Quarantine | Xie W.,Zhejiang Academy of Science and Technology for Inspection and Quarantine | Li J.,Zhejiang Lead Product Technic Co. | Lu S.,Zhejiang Lead Product Technic Co. | And 2 more authors.
Journal of Chinese Mass Spectrometry Society | Year: 2016

A method of liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed for the determination of five nitrogen-rich adulterants (dicyclanil, dicyandiamide, biuret, cyromazine, melamine) in milk and powdered milk samples. These compounds were potential to be used in economic adulteration to enhance the nitrogen content in milk products. The protein of sample was precipitated, and the extracts were dissolved and distilled with acetonitrile. The supernatant solution was extracted with n-hexane to remove the fat, and then cleaned up with SPE HLB cartridges. The quantitative detection was performed on LC-MS/MS by multiple reaction monitoring (MRM) mode under positive electrospray ionization (ESI+). Isotopes dilution internal standard method (melamine) or external standard method (dicyclanil, dicyandiamide, biuret and cyromazine) was used to determine the residue contents in samples. The limits of quantification (LOQs, S/N=10) are dicyclanil (0.5 μg/kg), dicyandiamide (2.5 μg/kg), biuret (20 μg/kg), cyromazine (5 μg/kg), melamine (15 μg/kg) for milk samples and dicyclanil (8 μg/kg), dicyandiamide (35 μg/kg), biuret (50 μg/kg), cyromazine (40 μg/kg), melamine (50 μg/kg) for powered milk samples. Single-laboratory method validation data are determined, the calibration standard curves concentration are 0, 50, 100, 200, 400 μg/kg and the correlation coefficients are more than 0.991. The average recovery is 72.4%-102.8%, and the relative standard deviation (RSD) is 1.3%-12.3%. The residues of 5 compounds in 55 batches of milk and milk powder samples are determined by LC-MS/MS, and the results are consistent with the national standard method (GB/T 22388-2008). This method is suitable for determination and confirmation of these compounds and provides a convenient, rapid and effective approach to proactively combat economically motivated adulteration in milk and powdered milk sample. © 2016, Editorial Board of Journal of Chinese Mass Spectrometry Society. All right reserved. Source


Li B.,Zhejiang University | Su T.,Zhejiang University | Yu R.,Zhejiang University of Technology | Tao Z.,Zhejiang University | And 5 more authors.
African Journal of Microbiology Research | Year: 2010

The inhibitory activities of seven Paenibacillus polymyxa strains and nine Paenibacillus macerans strains against Ralstonia solanacearum strains were examined. Result from this study indicated that the growth of all R. solanacearum strains except strain E406 were inhibited by P. macerans MB02-992 and P. polymyxa MB02-1007, while the other fourteen Paenibacillus strains had no in vitro inhibitory effect against R. solanacearum strains. In addition, suspensions of the two antagonistic bacteria showed antibacterial activities against R. solanacearum under different treatments and reduced the disease incidence and severity of tomato bacterial wilt. Overall, this study clearly demonstrates that antagonistic substances may play an important role in biocontrol of the two antagonistic bacteria. However, antimicrobial activities of P. macerans and P. polymyxa depend on the Paenibacillus strains and the target pathogen. This is the first report about the antibacterial activities of Paenibacillus strains against R. solanacearum strains isolated from different host plants. © 2010 Academic Journals. Source


Wu G.,Zhejiang Academy of Science and Technology for Inspection and Quarantine | Wu G.,Zhejiang University | Zhao S.,Zhejiang Academy of Science and Technology for Inspection and Quarantine | Wu J.,Zhejiang Academy of Science and Technology for Inspection and Quarantine | And 4 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2011

A novel method has been developed for the rapid separation and determination of 7 nipagin ester preservatives in leather by ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) coupled with gel permeation chromatographic (GPC) clean-up. Nipagin ester preservatives in leather were extracted by ultrasonic extraction with methanol. The extract was dried by a rotavapor and purified by GPC, then redissolved in the solvent of methanol-water (1: 1, v/v). The chromatographic analysis was performed on an Acquity UPLC® BEH C18 column (50 mm × 2.1 mm, 1.7 μm) with a gradient elution of methanol and water as the mobile phases. The analytes were detected by electrospray ionization (ESI) tandem mass spectrometry with multiple reaction monitoring (MRM) in negative ion mode. Good linearity (r > 0.99) was observed between 0.1 and 1.0 mg/L for all the analytes. The recoveries and relative standard deviations (RSDs) were checked by spiking samples with the 7 nipagin ester preservatives at the three levels of 0.5, 1.0 and 3.0 mg/kg. The average recoveries of the 7 nipagin ester preservatives were from (79. 44 ± 5.67)% to (98. 07 ± 9. 50)%. The precision values expressed as RSD ranged from 4.24% to 14.00% (n=6). The limits of detection were 4 - 12 μg/kg and the limits of quantification were 13.2-39.6 μg/kg for the analytes. The method is simple, rapid, sensitive and accurate, and suitable for the quantitative determination and confirmation of 7 nipagin ester preservatives in leather. Source


Liu H.,Zhejiang Entry Exit Inspection and Quarantine Bureau | Liu H.,Zhejiang Academy of Science and Technology for Inspection and Quarantine | Qian X.,Zhejiang University of Technology | Lu C.,Zhejiang Entry Exit Inspection and Quarantine Bureau | And 5 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2013

A high performance liquid chromatographic method was developed for the simultaneous determination of 10 synthetic colorants in cosmetics. The cosmetics were extracted by the ultrasonic technique with tetrahydrofuran (THF), dimethyl sulfoxide (DMSO) and methanol sequentially. Then the extracts were centrifuged for purification and separated on an Eclipse XDB-C18 column (150mm x 4.6mm, 5 μm) with gradient elution by acetonitrile and 0.02mol/L ammonium acetate (pH 4.60, adjusted with acetic acid). A diode array detector was used to determine the colorants with the wavelengths ranging from 417nm to 640nm. The linear relationships of the 10 colorants between the peak areas and the mass concentrations were obtained in the range of 0. 5 -20. 0mg/L (r >0.999). The limits of quantitation ranged from 10 to 20mg/kg. The average recoveries at three concentration levels ranged from 92.9% to 108.8% with the relative standard deviations in the range of 0.5% to 6.1% (n=6). The method is simple, rapid and sensitive. It is suitable for the simultaneous determination of the 10 colorants in the oil cosmetics, cream cosmetics and powder cosmetics. Source

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