Henan Province Product Quality Supervision and Inspection Center

Zhengzhou, China

Henan Province Product Quality Supervision and Inspection Center

Zhengzhou, China

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Cai C.,Guangdong Pharmaceutical University | Gao Y.,Guangdong Pharmaceutical University | Liu Y.,Henan Province Product Quality Supervision and Inspection Center | Zhong N.,Guangdong Pharmaceutical University | Liu N.,Shaanxi University of Science and Technology
Food Chemistry | Year: 2016

In this study, Candida antarctica lipase B (CALB) was immobilized on SBA-15 with three pore diameters. CALB loading was found increased with CALB concentration increasing from 20.3 to 80.12 μg/ml. Higher CALB loading was observed from SBA-15 with pore diameters at 8.1 nm (SBA-15(8.1)), yet highest hydrolytic activity was found at SBA-15(12.5). Thermal stability of the immobilized CALB (SBA-15-CALB) samples was greatly influenced by their water content, after 4 h storage at 70 °C, 8.93 and 67.4% of the initial activity was observed from SBA-15-CALB samples with water content at 9.23 and 3.22% respectively. The SBA-15-CALB samples were then used in glycerolysis of corn oil, and 53.6 wt% of diacylglycerols was obtained after optimization. The operational stability was tested, and after 5 consecutive applications, 92.5 and 80.3% of the initial glycerolysis activity was remained respectively from SBA-15(6.6)-CALB and SBA-15(12.5)-CALB.


Sun X.,Guilin University of Technology | Deng J.,Guilin University of Technology | Liu S.,Guilin University of Technology | Yan T.,Guilin University of Technology | And 6 more authors.
Applied Physics A: Materials Science and Processing | Year: 2016

Giant dielectric ceramics Ba(Nb0.5Fe0.5-xTix)O3 (BNFT) have been fabricated by a conventional solid-state reaction. According to X-ray diffraction analysis, the crystal structure of these ceramics can be described by the cubic centrosymmetric with Pm-3m space group. The real part (ε’) of dielectric permittivity and dielectric loss (tanδ) of the BNFT ceramics was measured in a frequency range from 40 Hz to 100 MHz at room temperature. The (ε’) of all these samples displays a high value (~6500) and a small frequency-dependence from 1 kHz to 1 MHz. We have established a link between conductivity activation energy and defect compensation at grain boundaries. The Ti4+-doped Ba(Nb0.5Fe0.5)O3 as a donor makes a great influence on the grain boundary behavior, which restricts the migration of oxygen vacancy and depresses dielectric loss factor for Ba(Nb0.5Fe0.5)O3 ceramics. © 2016, Springer-Verlag Berlin Heidelberg.


Li G.-H.,Henan University of Technology | Wang X.-Y.,Henan University of Technology | Zhao F.,Henan Province Product Quality Supervision and Inspection Center | Yang Y.,Henan University of Technology | Ren G.-W.,Henan University of Technology
Modern Food Science and Technology | Year: 2014

Grape seed oil with acid value of 15.12±0.016 mg KOH/g, was used as raw material, and the effects of chemical, physical and enzymatic deacidification on the content and kind of trans fatty acids in the grape seed oil were investigated. The changes of trans fatty acids content and acid value in different refined technologies were discussed. The acid values were reduced to 0.10±0.022 mg KOH/g, while the content of trans fatty acids increased by 0.31±0.0011% when chemical refined was employed. The optimal conditions of physical deacidification of the grape seed oil were deacidification temperature 240°C and time 8 h, under which the acid value of 0.13±0.018 mg KOH/g, and trans fatty acids content of 1.86% were obtained. The conditions of enzymatic esterification to deacidificate the grape seed oil were as follows: temperature 80°C, addition of glycerol 300% and enzyme 3% for 8 h. Under these conditions, the acid value declined to 2.36±0.026 mg KOH/g, while the content of trans fatty acids increased from 0.034±0.001% to 0.035±0.001%~0.041±0.0016%. Among the methods tested, the enzymatic esterification deacidification has the least influence on trans fatty acids content and followed by chemical refining.


He J.,Henan University of Technology | Chen S.,Henan University of Technology | Jiang Y.,Henan Province Product Quality Supervision and Inspection Center | Shen Y.,Henan University of Technology | And 4 more authors.
Journal of Separation Science | Year: 2012

A prepared molecularly imprinted polymer with ethyl p-hydroxybenzoate as template molecule was applied for the first time to a homemade solid-phase microextraction fiber. The molecularly imprinted polymer-coated solid-phase microextraction fiber was characterized by scanning electron microscopy and thermogravimetric analysis. Various parameters were investigated, including extraction temperature, extraction time, and desorption time. Under the optimum extraction conditions, the molecularly imprinted polymer-coated solid-phase microextraction fiber exhibited higher selectivity with greater extraction capacity toward parabens compared with the nonimprinted polymer-coated solid-phase microextraction fiber and commercial fibers. The molecularly imprinted polymer-coated solid-phase microextraction fiber was tested using gas chromatography to determine parabens, including methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, and propyl p-hydroxybenzoate. The linear ranges were 0.01-10μ/mL with a correlation coefficient above 0.9943. The detection limits (under signal-to-noise ratio of 3) were below 0.30μ/L. The fiber was successfully applied to the simultaneous analysis of three parabens in spiked soy samples with satisfactory recoveries of 95.48, 97.86, and 92.17%, respectively. The relative standard deviations (n=6) were within 2.83-3.91%. The proposed molecularly imprinted polymer-coated solid-phase microextraction method is suitable for selective extraction and determination of trace parabens in food samples. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Li X.,Henan University of Technology | Miao X.,Henan Province Product Quality Supervision and Inspection Center
Advanced Materials Research | Year: 2012

16 samples of sesame oils adulteration with rapeseed oil and peanut oil were detected by gas chromatography, and the Similarity of chromatographic fingerprint (SCF) was applied to analysis the adulteration quantity of these samples. The Weighted Vectorial Angle Method (WVAM) was brought forward to calculate similarity between fingerprints of adulterated oil and unadulterated oil. The experiment results showed that the Similarity of chromatographic fingerprint can be proposed as the major analysis method to assess the sesame oil purity. © (2012) Trans Tech Publications.


Wang X.,Henan University of Technology | Li G.,Henan University of Technology | Zhao F.,Henan Province Product Quality Supervision and Inspection Center | Yang Y.,Henan University of Technology | Ji J.,Henan University of Technology
Journal of the Chinese Cereals and Oils Association | Year: 2015

In order to study the effects of the chemical and physical refining process on the oxidative fission quality of grape seed oil, variations of trans fatty acids, acid value, peroxide value, p-anisidine value and content of VE were discussed and further analyzed for the suitable refining technology. During the chemical refined process of grape oil, the acid values reduced to (0.20±0.016) mg KOH/g. The peroxide values and p-anisidine values decreased. The loss of the VE content was 37%~43%.The trans fatty acids increased to (0.36±0.001 4)%. During the physical refined process of grape oil at temperature of 240℃, the vacuum residual pressure and time of 6 h, the acid value dropped to (0.19±0.029) mgKOH/g. The peroxide values decreased while p-anisidine values increased. The trans fatty acid increased to (0.91±0.001 3)%, and the loss of the VE content was 50.69%.The results showed that the physical refining process had stronger impact on the quality of grape seed oil than chemical refining. ©, 2015, Journal of the Chinese Cereals and Oils Association. All right reserved.


Yang Y.,Henan University | Li G.-H.,Henan University | Zhao F.,Henan Province Product Quality Supervision and Inspection Center | Wang X.-Y.,Henan University
Modern Food Science and Technology | Year: 2014

In order to improve the quality of refined wheat germ oil, the degree of deterioration in the quality of wheat germ oil during chemical and physical refining was investigated. For the wheat germ oil processed by chemical refining, the acid value dropped to 0.18 KOH/(mg/g), the trans fatty acid content increased to 0.070% from an undetectable level in crude oil, and the tocopherol content decreased by 37.83%. For the physical refining of wheat gream oil, deacidification was conducted under a residual pressure of ≤60 Pa in a temperature range of 200~240℃ for 2~8 h. The acid value dropped to 5.49 KOH/(mg/g)~0.19 KOH/(mg/g), the trans fatty acid content was between 0.13% and 3.13%, the peroxide value ranged from 1.61 mmol/kg~4.33 mmol/kg, the anisidine value ranged from 13.76~59.3, and the tocopherol content decreased by 26.68%~85.90%. Comparison of the two refining processes revealed that the chemical refining process had less significant effects on the deterioration of wheat germ oil quality than the physical refining process, particularly in regard to preventing the increase in the trans fatty acid content, and the loss in vitamin E content among others. Therefore, chemical refining is suitable for functional and nutritious oils rich in unsaturated fatty acids, vitamin E, etc. ©, 2014, South China University of Technology. All right reserved.


Fu L.-L.,Zhengzhou University | Fu L.-L.,Henan Province Product Quality Supervision and Inspection Center | Jiang D.-G.,Zhengzhou University
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2016

Thermodynamics of isopropyl palmitate synthesis via a two-step noncatalytic method including acylation and alcoholysis reactions was studied. The thermophysical properties of palmitic acid, palmitoyl chloride and isopropyl palmitate were calculated by Tyagi equation, Joback method and Yoneda method. ΔrHm θ, ΔrSm θ, ΔrGm θ, and Kθ were estimated and these data were analyzed at different temperatures. The results show that the acylation reaction is endothermic and difficult to achieve separately under standard conditions, while the alcoholysis reaction is exothermic and can be fully preceded separately. Considering the thermodynamics of the whole two-step reaction, the acylation reaction can happen following the approximate principle and Le Chatelier's Principle. © 2016, Editorial Board of “Journal of Chemical Engineering of Chinese Universities”. All right reserved.


Fu L.,Zhengzhou University | Fu L.,Henan Province Product Quality Supervision and Inspection Center | Bai Y.,CAS Institute of Process Engineering | Lu G.,Henan EPRI Hitech Group Co. | Jiang D.,Zhengzhou University
Chinese Journal of Chemical Engineering | Year: 2015

In this study, the kinetics of isopropyl palmitate synthesis including the reaction mechanism was studied based on the two-step noncatalytic method. The liquid-phase diffusion effect on the reaction process was eliminated by adjusting the stirring rate. The results showed that the two-step reaction followed a tetrahedral mechanism and conformed to second-order reaction kinetics. Nucleophilic attack on the carbonyl carbon afforded an intermediate, containing a tetrahedral carbon center. The intermediate ultimately decomposed by elimination of the leaving group, affording isopropyl palmitate. The experimental data were analyzed at different temperatures by the integral method. The kinetic equations of the each step were deduced, and the activation energy and frequency factor were obtained. Experiments were performed to verify the feasibility of kinetic equations, and the result showed that the kinetic equations were reliable. This study could be very significant to both industrial application and determining the continuous production of isopropyl palmitate. © 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.


Bai Y.-G.,Zhengzhou University | Fu L.-L.,Zhengzhou University | Fu L.-L.,Henan Province Product Quality Supervision and Inspection Center | Jiang D.-G.,Zhengzhou University
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2014

Methyl oleate was an important chemical material, but the production was restricted by equipment corrosion, environmental pollution and low conversion. Non-catalyst two-step method was offered to synthesize methyl oleate. Firstly, oleic acid was reacted with thionyl chloride to obtain active oleoyl chloride, followed by the alcoholysis of oleoyl chloride with methanol to obtain methyl oleate. The kinetic equations for the two reactions were established. The kinetic experiments were carried out at 293, 298, 303, 308, 313 K, respectively. The experimental data at different temperatures were analyzed by the integral method. The results show that two steps of methyl oleate synthesis are a second order reaction both and the reactions follow tetrahedral mechanism. The frequency factors are 2.76×1019 and 4.03×1018, and activation energies are 121.6, 115.2 kJ/mol respectively for two reactions, which are obtained from the reaction rate constants at different temperatures by using the Arrhenius equation. The calculation data of the kinetic equations are in good agreement with the experimental data at 293-313 K, which shows that the kinetic equations are reliable and reasonable. It provides the basic data for the industrial development of methyl oleate.

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