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.


Fu L.-L.,Zhengzhou University | Fu L.-L.,Henan Province Product Quality Supervision and Inspection Center | Jiang D.-G.,Zhengzhou University | Zhou C.-R.,Zhengzhou University
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2017

In order to analyze the feasibility of an two-step synthesis method of isopropyl palmitate, thermodynamic parameters of chemicals used in the reaction were measured with differential scanning calorimeter DSC-60 and an oxygen bomb calorimeter XRY-1C. Specific heat capacities and standard molar combustion enthalpies of those relevant chemicals are obtained. Moreover, molar formation enthalpies and the whole reaction enthalpy change are calculated. These thermodynamic results provide fundamental data for the industrial continuous production of isopropyl palmitate. © 2017, Editorial Board of “Journal of Chemical Engineering of Chinese Universities”. All right reserved.


Zhao Y.,Henan Key Laboratory of Meat Processing and Quality Safety Control | Wei F.-S.,Henan Province Product Quality Supervision and Inspection Center | Zhao G.-M.,Henan Key Laboratory of Meat Processing and Quality Safety Control | Song L.-J.,Henan Key Laboratory of Meat Processing and Quality Safety Control | And 4 more authors.
Modern Food Science and Technology | Year: 2017

To determine the effect of sodium chloride on the thermal resistance of Geobacillus stearothermophilus at temperatures below 100℃, G. stearothermophilus bacterial suspensions of 107 CFU/mL were used as the initial cultures for heat treatment. After the center temperature of the suspension reached 70℃, 80℃, and 90℃, respectively, the corresponding death rates and residual concentrations of G. stearothermophilus in the suspensions, prepared using different concentrations of sodium chloride, were studied, and the inactivation models of each temperature and concentration of sodium chloride were preliminarily established based on the residual concentrations. The results indicated that the inactivation curves of G. stearothermophilus suspensions under all conditions could be fitted with the DoseResp model in Origin 8.0, and all coefficients of determination (R2) were above 0.96. Single factor analysis of variance was performed on the thermal death rate of G. stearothermophilus at different temperatures, different time points, and different concentrations of sodium chloride. The death rate in the control during the first 40 s reached 95% or more at different temperatures, and the death rate with different concentrations of sodium chloride at temperatures below 70℃ reached more than 95% during the first 120 s, more than 93% at 80℃ during the first 60 s, and 98% or more at 90℃ during the first 60 s. Therefore, different concentrations of sodium chloride had a protective effect on G. stearothermophilus, and the protective effect of 2% sodium chloride was more significant than that of the other concentrations of sodium chloride tested. © 2017, Editorial Board of Modern Food Science and Technology. All right reserved.


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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