Determination Of 6 Fluoroquinolones Residues In Aquatic Products By Solid Phase Extraction And Ultra Performance Lquid Chromatography,
2018
College of Life and Environmental Sciences, Hunan University of Arts and Science, Changde, Hunan 415000, China; Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province, Changde, Hunan 415000, China; Key Laborator
Determination Of 6 Fluoroquinolones Residues In Aquatic Products By Solid Phase Extraction And Ultra Performance Lquid Chromatography, He Jiang, Li Xiaoyue, Qiu Yujie, Li Boen, Yang Pinhong
Food and Machinery
Based on solid phase extraction (SPE) and ultra high performance liquid chromatography (UPLC) technique, a method has been developed for the simultaneous detection and analysis of 6 fluoroquinolones residues in aquatic products. The optimized process and parameters of this method were as followed: treated aquatic products were extracted with phosphate buffer, the extracting solution were purified by SPE and concentrated by blowing nitrogen, and the residues were then dissolved in 0.2% formic acid solution for UPLC analysis; Chromatographic column BEH C18 (1.7 μm, 2.1 mm×50 mm) were applied, and citric acid (0.05 mol/L)-ammonium acetate (0.1 mol/L) buffer were used …
Simultaneous Determination Of Diafenthiuron And Its Degradation Products In Teas By Dispersive Solid-Phase Extraction And High Performance Liquid Chromatography-Tandem Mass,
2018
School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, Hunan410076, China
Simultaneous Determination Of Diafenthiuron And Its Degradation Products In Teas By Dispersive Solid-Phase Extraction And High Performance Liquid Chromatography-Tandem Mass, Xiao Limin, Wang Meiling, Dai Jieyun, Dai Hua
Food and Machinery
A simple and efficient method based on QuEChERS and high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was developed for the determination of diafenthiuron and itss degradation products in tea. The sample was extracted with acetonitrile and cleaned up with QuEChERS. In the chromatographic analysis, three target compounds were separated on a C18 column (150 mm × 4.6 mm, 3.5 μm) with the gradient elution using the mobile phases of acetonitrile and water containing 0.1% acetic acid. The mass analyzer was performed using positive scan mode with MRM monitor using external standard method. The results showed that the limits of …
Rapid Identification Of Lonicerae Japonicae Flos And Lonicerae Flos Based On Hyperspectral Imaging,
2018
College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, Henan 471023, China
Rapid Identification Of Lonicerae Japonicae Flos And Lonicerae Flos Based On Hyperspectral Imaging, Feng Jie, Liu Yunhong, Wang Qingqing, Yu Huichun, Shi Xiaowei
Food and Machinery
In order to identify Lonicerae Japonicae Flos and Lonicerae Flos rapidly and precisely, a hyperspectral imaging technology combined with chemometric methods was applied to develop the nondestructive identification models for Lonicerae Japonicae Flos and Lonicerae Flos. Firstly, the original spectral data were analyzed by three pretreatment methods including Savitzky-Golay (SG) convolution smoothing, Multiple Scatter Correct (MSC) and Standard Normal Variate Transformation (SNV). A comparison was made among SG, MSC and SNV based on Partial Least Squares (PLS), of which the best pretreatment method was SNV. The Regression Coefficient (RC) and Successive Projection Algorithm (SPA) were used to extract the characteristic …
Determination Of Retinol Palmitate And Retinol Acetate In Formulas For Special Medical Purposes Intended For Infants By Hplc,
2018
Hunan Provincial Food Quality Supervision and Inspection Institute, Changsha, Hunan 410011, China
Determination Of Retinol Palmitate And Retinol Acetate In Formulas For Special Medical Purposes Intended For Infants By Hplc, Li Tao, Zhou Yanhua, Sun Guifang, Yang Tao, Yin Weicheng, Yang Qingyi
Food and Machinery
Retinol palmitate and retinol acetate in formulas for special medical purposes intended for infants was determined using NP-HPLC. The HPLC system consisted of NH2 column (150 mm×4.6 mm, 5.0 μm), mobile phase of n-hexane-25.0% tert-butyl methyl ether n-hexane solution (955), flow rate of 1.0 mL/min, injection volume of 50 μL, column temperature of 30 ℃, UV detector detection wavelength of 325 nm. Results showed that retention time of retinol palmitate and retinol acetate were 3.5 min and 6.0 min, respecitively the linearity was good in the range of 0.05～10.0 μg/mL with a correlation coefficient of 0.999 9, the detection …
Design And Research Of Low Temperaturewear Simulation Testing Machine,
2018
Mechanical Engineering Department, North China Institute of Aerospace Engineering, Langfang, Hebei 065000, China; CRRC Meishan Co., Ltd., Meishan, Sichuan 620032, China
Design And Research Of Low Temperaturewear Simulation Testing Machine, Shen Peng, Cao Huiqiong, Qiao Yuli
Food and Machinery
On basis of the simulation of the metal contact behavior under low temperature condition, an experimental device for metal simulation testing under low temperature was designed and fabricated; then its designing method, operation, key technological parameters, and points for attention in usage and components such as rolling testing bench, computer control system, cooling system which are introduced in detail. The testing machine has many advantages as follow: Range of -60～0 ℃ ambient temperature can be simulated steadily, which can be offset automatically and precisely through low temperature solenoid valve; The experimental speed of specimenⅠ/ specimenⅡ can be adjusted independently as …
Influence Of Different Mode Of Liquid Supply On The Temperature Field Of Evaporated Plate,
2018
College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China; Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation, Shanghai 201306, China
Influence Of Different Mode Of Liquid Supply On The Temperature Field Of Evaporated Plate, He Weidong, Wan Jinqing, Huang Minglei, Ge Rui
Food and Machinery
This paper studied the temperature distribution of different mode of liquid supply in plate freezer under the same working condition, and analyzed the reasons for the inequality freezing rate of the flat plate. The freezing experiment of the fluid supply with ejector and the expansion valve at the same condense temperature in 35 ℃ was carried out respectively. The results showed that: at the end of freezing, the minimum temperature reached to -35.9 ℃ by using expansion valve, and the maximum temperature difference of frozen products was 17.55 ℃. The temperature difference of each layer was large, and the temperature …
Effect Of Frequency Shifts Range On Heating Pattern Of Domestic Microwave Oven,
2018
Engineering Research Center of Food Thermal-Processing Technology, Shanghai Ocean University, Shanghai 201306, China; Department of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
Effect Of Frequency Shifts Range On Heating Pattern Of Domestic Microwave Oven, Yan Ruoping, Wang Yifen, Luan Donglei
Food and Machinery
In order to maintain the stability of heating, the effect of frequency shifts range on heating pattern of domestic microwave was invested based on the numerical simulation method. In this study, the frequency of a microwave oven was measured under no-load and load conditions and a computational simulation model was developed to investigate the effect of frequency shifts on heating pattern of microwave heating. The results showed that the frequency of microwave was constantly changing during microwave heating in the oven; when the frequency shifts was large, the temperature distribution was not stable even heating the same food; the heating …
Development Of LuAn Guapian Tea Baker Based On Photoelectric Control,
2018
School of Engineering, Anhui Agricultural University, Hefei, Anhui 230036, China; State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, Anhui 230031, China
Development Of LuAn Guapian Tea Baker Based On Photoelectric Control, Li Bing, Sun Changying, Li Weining, Song Yangyang
Food and Machinery
The rotary Lu'an Guapian baker was designed, according to the Lu'an Guapian traditional baking process. Far-infrared radiation heating unit was used in the tea baker, and an intermittent heating mode was used at the same time. The rotary table was droved by 0.5 kW AC motor, with the electric heating unit power 36 kW, heating and stopping time form 3 s to 5 s. The intermittent heating control system and the strong anti-jamming infrared light emitting and receiving circuit were designed in the study. Double 555 multivibrator is used as infrared emission circuit, and UPC1373 and audio PLL IC LM567 …
Test And Analysis On The Picking Force Of Processing Tomato Fruit,
2018
College of Mechanical and Electrical Engineering, Shihezi University, Shihezi, Xinjiang 832003, China; Key Laboratory of Northwest Agricultural Equipment of Ministry of Agriculture, Shihezi, Xinjiang 832003, China
Test And Analysis On The Picking Force Of Processing Tomato Fruit, Luo Xinyu, Wang Jikui, Luo Yongjun, Luo Wei
Food and Machinery
As fruit picking must overcome the connection force between fruit stalk and fruit, the tensile force and torsion moment of tomato picking were measured by test for revealing the size and its change of tomato fruit picking force during tomato fruit picking practice.The test results show that the size of the ripe processing tomato picking force is related to the movement direction of the fruit in picking operation. When the fruit is moving in a direction, the picking force is smaller with the tilting angle of the stalk being greater, the force of tomato fruit picking has a linear correlation …
Optimization On Preparation Process Of Composite Film With Corn Nano-Starch/Cellulose Nanocrystalline,
2018
School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, Hunan 410076, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangdong, Guangzhou 510640, China
Optimization On Preparation Process Of Composite Film With Corn Nano-Starch/Cellulose Nanocrystalline, Chen Qijie, Zhou Liling, Zou Jiaqi, Chen Cong, Wang Jianhui
Food and Machinery
The corn nano-starch/cellulose nanocrystalline(CNC) composite film was prepared by casting method with corn nano-starch as substrate, glycerol as plasticizer and CNC as reinforcing agent. Film forming substrate and drying temperature have influences on film formation of nano-starch, and PVC matrix plate is better. When drying temperature is 25 ℃, the film forming is smooth and good. The effects of corn nano-starch, glycerol and CNC content on the strength properties of nano-starch/CNC composite film were investigated by single factor, and three factors and three levels orthogonal test were also carried out. Orthogonal optimization study showed that the tensile strength of composite …
Simulation Study On Vibration Of Food Cushioning Liner Based On Pseudo White Noise Method,
2018
Shaanxi University of Science & Technology, College of Mechanical and Electrical Engineering, Xian, Shaanxi 710021, China
Simulation Study On Vibration Of Food Cushioning Liner Based On Pseudo White Noise Method, Chen Ning, Zhang Gongxue
Food and Machinery
By filtering the white noise method to simulate the incentive model in food transportation, a conventional seven degree of freedom dynamic model for a foam material liner is established, and the vertical displacement and deflection displacement response of the food lining system under virtual excitation excitation are obtained. The MATLAB software is used to program the random Gauss white noise and filter, and the ode45 module is used to solve the differential equation of the system dynamics. The vertical vibration displacement of all legs is consistent. The numerical value is less than 0.007 5 m, the deflection angle between 0.006 …
Study On Bacteriostat To Colletorichum Orbiculare Of Muskmelon And Fresh Keeping Effects Of Bio-Liquid,
2018
Agriculture College of Yanbian University, Yanji, Jilin 133002, China
Study On Bacteriostat To Colletorichum Orbiculare Of Muskmelon And Fresh Keeping Effects Of Bio-Liquid, Liu Fangfang, Li Fanzhu, Zhang Xian, Li Min
Food and Machinery
To develop a new type of fruit and vegetable preservative with low toxicity and harmLess, the bio-liquid was used as the main experimental material, and the antibacterial effects and mechanism of bio-liquid on the Colletorichum orbiculare and the effect on the preservation of muskmelon were studied. The results showed that the bio-liquid had obvious antibacterial effect on the Colletorichum orbiculare, and the EC50 and EC70 ere 1.8% and 2.4%, respectively. The bio-liquid could destroy the membrane structure of the Colletorichum orbiculare and the rupture the cell membrane, which caused the exudation of proteins, nucleic acids, and carbohydrates. Treated …
Antibacterial Activity And Application On Grass Carp Muscle In Cold Storage Of Camphor Tree Leaves’ Polyphenol,
2018
College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
Antibacterial Activity And Application On Grass Carp Muscle In Cold Storage Of Camphor Tree Leaves’ Polyphenol, Li Yinghong, Li Zhonghai, Fu Xiangjin, Zhang Hui
Food and Machinery
To investigate the antibacterial activity of camphor tree leaves’ polyphenol in food preservation, the effect of camphor tree leaves’ polyphenol was studied, on 7 strains of pathogenic bacteria and spoilage bacteria, and the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined. Furthermore, the effect of camphor tree leaves’ polyphenol on the total colony, pH value, total volatile basic nitrogen (TVB-N) content and trimethylamine content of grass carp meat during cold storage was investigated. The camphor tree leaves’ polyphenol inhibited these strains effectively, the MIC on Pseudomonas fluorescens, Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Penicillium citrinum, Aspergillus niger, …
Circularity Of Apple Measurement Based On The Improved Algorithm Of The Particle Swarm Optimization,
2018
San Men Xia Health School, Sanmenxia, Henan 472143, China
Circularity Of Apple Measurement Based On The Improved Algorithm Of The Particle Swarm Optimization, Shen Cuixiang, Zhang Xiaoyu
Food and Machinery
In order to solve the problem in the accuracy of circularity of apple, the improved algorithm of the particle swarm was adopted. Firstly, mathematical model circularity of apple was established. Secondly, particle swarm algorithm was improved, which was included inertia weight fuzzy control based on membership function of generalized bell shaped distribution, adaptive Z shaped membership function adjustment process, and selecting fitness function. Finally, the algorithm termination condition and flow were given. The experimental simulation results showed that the improved particle swarm optimization algorithm convergence was faster than the particle swarm optimization, and the accuracy of Jonakin and Fuji Apple …
Optimization Of Ultrasonic Microwave-Assisted Extraction Of Oligosaccharide From Lotus (Nelumbo Nucifera Gaertn.) Seeds Using Response Surface Methodology,
2018
College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; Fujian Provincial Key Laboratory of Quality Science and Processing Technology in Special Starch, Fuzhou, Fujian 350002, China
Optimization Of Ultrasonic Microwave-Assisted Extraction Of Oligosaccharide From Lotus (Nelumbo Nucifera Gaertn.) Seeds Using Response Surface Methodology, Guo Zebin, Chen Jinghao, Jia Xiangze, Lu Xu, Zheng Baodong
Food and Machinery
Ultrasonic microwave-assisted extraction of oligosaccha-rides from lotus (Nelumbo nucifera Gaertn.) seeds (LOS) was investigated. The five parameters, ultrasonic time, ultrasonic temperature, microwave power, microwave time and solid to liquid ratio were optimized using the Box-behnken design with a quadratic regression model built by using Response Surface Methodology (RSM). The highest oligosaccharide yield, (10.525±0.017)%, was obtained under optimal conditions for ultrasonic time, ultrasonic temperature, microwave power , liquid to solid ratio and microwave time at 10 min, 45 ℃，100 W，100 min and 301 (mL/g), respectively.
Extraction Of Podocarpus Nagi Nut Oil And Analysis Of Their Physicochemical Properties,
2018
School of Chemistry and Environment, Guangdong Ocean University, Zhanjiang, Guangdong 524088, China
Extraction Of Podocarpus Nagi Nut Oil And Analysis Of Their Physicochemical Properties, Lu Lulu, Yang Chongwen, Li Chengyong, Sun Shengli, Yan Xiemin, Su Tiantian, Feng Yanting
Food and Machinery
In order to further develop the resources of Podocarpus Nagi, the technology of ultrasonic assisted soxhlet extraction for the extraction of Podocarpus nagi was optimized by single factor and response surface tests. The physicochemical properties and fatty acid composition were analyzed. The results showed that the optimum extraction conditions were as follows: the extraction temperature 75 ℃, the solid-liquid ratio 140 （g/mL）, the extraction time 150 min and extraction solvent n-hexane. Under this condition, the yield of bamboo nut oil was 29.32%. The analysis via GC-MS method showed that nine kinds of fatty acids were detected in the bamboo nut …
Studies On The Extraction Process And Its Stability Of Yellow Pigment From Rosa Sterilis D. Shi,
2018
Food and Pharmaceutical Engineering Institute, Guiyang University, Guiyang, Guizhou 550005, China;Guizhou Engineering Research Center for Fruit Processing, Guiyang, Guizhou 550005, China
Studies On The Extraction Process And Its Stability Of Yellow Pigment From Rosa Sterilis D. Shi, Xie Guofang, Tian Yonglin, Deng Yuling, Zhou Xiaoli, Liu Yongling, Zhao Zhibing, Ma Lizhi
Food and Machinery
The extraction conditions of yellow pigment from Rosa sterilis D. shi were optimized by extraction agent screening and uniform experimental design, and the effects of light, pH, oxidant, reducing agent, metal ions and sugar on their stability and antioxidant capacity was investigated. The optimum extraction conditions of Camellia oleifera cake were obtained as follows: 80% acetone, the ratio of material to liquid is 116 （g/mL), each time ultrasonic assisted extraction for 3.5 h at 58 ℃, and extraction 2 times. The yellow pigment was unstable in the sunlight, but showing a strong antioxidant capacity. Yellow pigment and its antioxidant capacity …
Extraction Of Insoluble Dietary Fiber From Purple Sweet Potato By Ultrasonic Assisted Enzyme Method And The Determination Of Its Hydroxyl Radical Scavenging Ability,
2018
College of Biological Science and Technology, Minnan Normal University, Zhangzhou, Fujian 363000, China; Engineering Research Center of Fujian Province for Fungal Industry, Zhangzhou, Fujian 363000, China
Extraction Of Insoluble Dietary Fiber From Purple Sweet Potato By Ultrasonic Assisted Enzyme Method And The Determination Of Its Hydroxyl Radical Scavenging Ability, Xue Shan
Food and Machinery
The process of extracting the insoluble dietary fiber (IDF) of purple potato by ultrasonic-assisted enzymatic method was studied, and its antioxidation in vitro was also evaluated. The effect of five factors (ratio of material to liquid, ultrasonic time, ultrasonic power, alpha amylase dosage and enzyme hydrolysis temperature) on insoluble dietary fiber extraction rate were determined. Orthogonal optimization test was carried out on the basis of single factor test, and the antioxidant level of IDF was evaluated by hydroxyl radical (·OH) in vitro. The single factor test showed that among the factors, the enzymolysis temperature played the most significant role on …
Purification Of Flavonoids From Eggplant Leaves Using Macroporous Resin And Its Antioxidant Activities,
2018
College of Agriculture and Biotechnology Hexi University, Zhangye, Gansu 734000, China
Purification Of Flavonoids From Eggplant Leaves Using Macroporous Resin And Its Antioxidant Activities, Yang Bin, Jin Xiaoqing, Li Caixia, Jia Oyang
Food and Machinery
Static adsorption and desorption experiments were carried out to determine the types of macroporous resins for purifying flavonoids from eggplant leaves, to optimize its technological conditions, and to comparatively analyze the antioxidant activities of eggplant leave flavonoids before and after purification. The results showed that NKA-II was the optimal adsorbent. The optimum conditions for purification of flavonoids from eggplant leaves were listed as follows: sample concentration of crude extracts 0.362 6 mg/mL, sample pH 2, the static absorption time, 2.5 h. After 40 minutes desorption with 70% ethanol (pH=3), the content of flavonoids was increased from 17.91% before purification to …
The Influence Of Foodborne Pathogens Growth Heterogeneity On Risk Assessment,
2018
College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
The Influence Of Foodborne Pathogens Growth Heterogeneity On Risk Assessment, Lu Yi, Liu Haiquan, Zhao Yong, Xie Jing, Pan Yingjie
Food and Machinery
In this review, the concept of growth heterogeneity of foodborne pathogenic bacteria was introduced. Moreover, the domestic and abroad study progress was reviewed, and the expression forms and influencing factors of strain growth heterogeneity were systematically summarized. In addition, the solutions for reducing the accuracy the growth heterogeneity of foodborne pathogenic bacteria to microbial risk assessment were also presented.
