Ji G.,Tianjin University of Technology |
Ji H.,Tianjin University of Technology |
Li X.,Technical Center for Safety of Industrial Products
Key Engineering Materials | Year: 2012
Zirconium diboride nano-powders were synthesized by novel sol-gel technology using zirconium oxychloride, boric acid and sucrose as row materials. Different sol network modifiers, such as propylene oxide (PO) and citric acid (CA), were used to control the formation of zirconia precursor sol, respectively. PO could stabilize the sol by protonation and ring-opening reactions, and CA could form the sol network by chelation, then transformed to gel network. Gel was dried, ground, and exposed to carbonthermal reduction heat treatment (1500°C, 2h, flowing 95%argon mix with 5% hydrogen) to prepare ZrB2 nano-powders. In this study, effects of sol network modifiers on preparation procedure, powder characteristics were performed by using Infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Transmission electron microscopy (TEM). The purity of ZrB2 will improve by increasing the molar ratio of B/Zr, the photomicrograph revealed nearly pure ZrB2 nano-powders with spherical shape of 50-200nm and well dispersed were obtained with a molar ratio of B/Zr of 3.0 at 1500°C for 2h using PO as chemical modifier. © (2013) Trans Tech Publications.
Duan Z.H.,Tianjin University of Technology |
Wang H.,Technical Center for Safety of Industrial Products |
Zhang X.,Tianjin University of Technology |
Li N.-T.,Technical Center for Safety of Industrial Products
Advanced Materials Research | Year: 2013
Bisphenol a (BPA), is a chemical that has been used for more than 40 years in the manufacture of many hard plastic food containers such as baby bottles and reusable cups and the lining of metal food and beverage cans, including canned liquid infant formula. Therefore, it is very necessary to study its health risk and ecological risk. In this paper, four typical estrogen acceptor genes (AHR1, ESR1, VTG1 and VTG3) in female zebrafish liver were studied to assess the low dose and chronic effects of bisphenol A (BPA), with the method of quantitative real-time RT-PCR, and the ability of self regulation and repair of these genes were also discussed. The results showed that these genes could be induced even at 15 ug/L BPA, and VTG 3 was the most sensitive gene. VTG 3 and VTG 1 had obvious self repair and adjustment ability when BPA risk was removed. No monotonic dose-effect relationships of BPA were also found at this study. © (2013) Trans Tech Publications, Switzerland.
Tong X.,Tianjin University of Technology |
Sun Y.,Tianjin University of Technology |
Yan Y.,Tianjin University of Technology |
Luo X.,Technical Center for Safety of Industrial Products |
And 2 more authors.
Journal of Molecular Catalysis A: Chemical | Year: 2014
A highly efficient N-bromosuccinimide (NBS)-mediated transition metal-free catalytic system has developed for the efficient aerobic oxidation of aromatic alcohols. Various aromatic alcohols are successfully oxidized to the corresponding aldehydes or ketones under mild condition. For instance, benzyl alcohol is oxidized to benzaldehyde with 99% conversion in 94.5% selectivity with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)-NaNO2-NBS system under 0.3 MPa of O2 at 90 °C for 2 h. The effects of reaction time, catalyst amount and solvents are investigated in detail, and a possible reaction mechanism is proposed. © 2014 Elsevier B.V.
Dong J.,Weinan Vocational and Technical College |
Dong J.,China Institute of Technology |
Peng Y.,China Institute of Technology |
Gao N.,Weinan Vocational and Technical College |
And 6 more authors.
Analyst | Year: 2012
A new surface-initiated polymerization based on pasting the initiator on a sensor chip surface was applied to prepare a malachite green (MG) imprinted ultrathin film on a surface plasmon resonance (SPR) sensor. First, the initiator (2,2-azoisobutyronitrile) was pasted on the gold surface using polyvinyl chloride (PVC). The initiator-covered gold chip was then soaked in a pre-polymerization solution prepared by dissolving methacrylic acid (functional monomer), ethylene glycol dimethacrylate (cross-linker), and MG (template) in DMSO in a weighing bottle. Finally, the weighing bottle was placed in a vacuum oven and thermal-initiated polymerization was conducted at 60 °C for 16 h. This method was simple and time-saving compared with the commonly used surface-initiated polymerization. More importantly, the molecularly imprinted polymer (MIP) film prepared using this method was much thicker than that of commonly used methods; the adsorption quantity was also much larger. The MIP modified SPR sensor showed high sensitivity and selectivity as well as good stability in detecting MG. The results suggest that the ultrathin MIP film prepared using the new method in this study is suitable to serve as the recognition element of the SPR sensor. © 2012 The Royal Society of Chemistry.
Song Y.,Tianjin Normal University |
Song Y.,Tianjin University of Science and Technology |
Liu M.,Technical Center for Safety of Industrial Products |
Wang S.,Tianjin University of Science and Technology
Journal of Agricultural and Food Chemistry | Year: 2013
A surface plasmon resonance (SPR) immunoassay using a PH-BSA immobilized sensor chip was developed to measure phosmet in food samples. The in-competitive inhibition assay showed highly sensitive and good specificity of the cross-reactivity with analogue structure pesticides. The biosensor exhibited a linear detection range from 8.0 to 60.0 ng/L of phosmet with a lower detection limit of 1.6 ng/L (S/N = 3). The sensitivity obtained with the present SPR affinity biosensor was significantly higher than most of the sensors reported with different measurement methodologies for phosmet. A recovery test of pesticide quantification in peaches, apples, cabbages, and rapes was also studied. Good recoveries (86.4-102.8%) and coefficients of variation (CVs) (5.1-12.6%) were obtained in all cases. The SPR biosensor assay method was compared with cd-ELISA in terms of analysis time, antibody dosage, recoveries, precision, detection limit, pretreatment, and testing costs, and clear advantages could be seen over the traditional ELISA-based detection systems. The developed SPR method was suitable for the rapid quantitative or qualitative determination of phosmet in agricultural products. © 2013 American Chemical Society.
Xing P.,Nanyang Technological University |
Xing P.,Shandong University |
Zhao Z.,Technical Center for Safety of Industrial Products |
Hao A.,Shandong University |
Zhao Y.,Nanyang Technological University
Chemical Communications | Year: 2016
Structural matching of two organic building blocks bearing glutamate units and different luminophores assembled into unilamellar nanovesicles in aqueous media through a co-assembly process. Aggregation-induced energy transfer took place in the co-assembled system, leading to controllable generation of multiple luminescence colors including white light. © The Royal Society of Chemistry 2016.
Han W.,The Hazardous Products Central Laboratory |
Han W.,Technical Center for Safety of Industrial Products |
Yu Y.J.,The Hazardous Products Central Laboratory |
Yu Y.J.,Technical Center for Safety of Industrial Products |
And 3 more authors.
Chinese Science Bulletin | Year: 2011
The technical breakthroughs and rapid developments in nanotechnologies enabling goods and products based on nanomaterials (NMs) has come to media and public attention as potentially one of the most significant technological advances of our time. Among these technical applications, nano-composite food packaging, which combines the NMs and conventional packaging, is at the forefront of applications in nanotechnologies, leading the whole industrial chain based on nanotechnologies with high speed development. Taking into account the status of the nano-composites applied in food packaging and present development trends, this review is focused on summarizing the basic applications of the nano-composites in food packaging as well as its risk assessment. The status summaries and the conclusions derived from this review are of benefit to manufacturers which produce the nano-composites used in food packaging, to general consumers and to governmental administration entities. © 2011 The Author(s).
Han W.,Technical Center for Safety of Industrial Products |
Yu Y.,Technical Center for Safety of Industrial Products |
Li N.,Technical Center for Safety of Industrial Products |
Wang L.,Technical Center for Hunan Entry Exit Inspection and Quarantine Bureau
Chinese Journal of Chromatography (Se Pu) | Year: 2011
A new analytical method based on gas chromatography-mass spectrometry (G6-MS) techniques was developed for the determination of five photoinitiators (Pis), benzophenone (BP), 4-methylbenzophenone (MBP), ethyl-4-dimethylaminobenzoate (EDAB) J 2-ethylhexyl-4-dimethylaminobenzoate (EHDAB) and 1-hydroxycyclohexyl phenyl ketone^ (Irgacure 184), in the printing inks used in food contact materials. The test solutions were extracted from selected food contact materials using Soxhlet extractor with ethyl acetate as the extraction solvent. By adding 50 and 200 μg/L of a standard mixture of photoinitiators into the extracts of the blank packaging materials; the recoveries obtained were in the range of 66. 7% - 89. 4%. The repeatability of the method was assessed by determining the contents of the photoinitiators in five types of food contact materials; and the results were lower than 10%. The instrumental detection limits (IDLs) and method quantification limits (MQLs) were in the range of 2. 9 -6. 0 μg/L and 0. 0017 - 0. 0036 mg/dm 2, respectively. The method was applied in the analysis of about twenty real samples (yogurt carton, milk carton, fruit juice carton and plastic bags samples). The most significant pollutants were BP and MBP. The concentrations of Irgacure 184, EDAB and EHDAB found in three individual samples were 0. 84 mg/dm 2, 0. 2 mg/dm 2 and 1. 2 mg/dm 2 respectively. The work proposed a new method to analyze the migration level of initiators from the inks.
Xu W.,Shaanxi University of Science and Technology |
Hao L.,Shaanxi University of Science and Technology |
Zhou L.,Technical Center for Safety of Industrial Products
Advanced Materials Research | Year: 2010
Traditional lime and sulfide dehairing process is a major source of the pollution, such as biochemical oxygen demand (BOD), chemical oxygen demand (COD), total dissolved solids (TDS), total suspended solids (TSS) and toxic H2S gas, etc. Enzymatic dehairing process is known to be cleaner but its dehairing effects are unsatisfactory. Hence, an attempt has been made to solve those two unhairing methods' disadvantages through a biochemical approach. Several commercial enzyme formulations were chosen to research effects of hydrosulfide and peroxide on its activities, and then hair-saving enzymatic unhairing experiments with those two reagents were conducted in paste and pile method more effectively and cleanly. Results show that activity of enzyme 2709 is stabilized by the addition of hydrosulfide through activity measurements; Peroxide has some activation effect on protease 3942. Hair removal is found to be complete using scanning electron microscope (SEM) analysis. Those two processes enjoy a significant reduction in BOD, COD, TDS and TSS. The perfromances of the experimental leathers are also comparable to that of conventional ones. Therefore, those are cleaner processing technologies that could be chosen to solve traditional method's disadvantage. © (2010) Trans Tech Publications, Switzerland.
PubMed | Technical Center for Safety of Industrial Products, Nanyang Technological University and Shandong University
Type: Journal Article | Journal: Chemical communications (Cambridge, England) | Year: 2016
Structural matching of two organic building blocks bearing glutamate units and different luminophores assembled into unilamellar nanovesicles in aqueous media through a co-assembly process. Aggregation-induced energy transfer took place in the co-assembled system, leading to controllable generation of multiple luminescence colors including white light.