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Articles 2401 - 2430 of 4798
Full-Text Articles in Food Biotechnology
Screening Study Of The Rice Varieties Suitable For Processing Ningbo Rice Balls, Pan Lihong, Luo Xiaohu, Wang Li, Chen Zhengxing
Screening Study Of The Rice Varieties Suitable For Processing Ningbo Rice Balls, Pan Lihong, Luo Xiaohu, Wang Li, Chen Zhengxing
Food and Machinery
15 kinds of Japonica and Indica rice, and 4 kinds of glutinous rice flours commonly used in the market for making glutinous rice balls, were selected and compared. The physicochemical properties, sensory characteristics and texture of the commercially available Ningbo glutinous rice balls were investigated. The results showed that the glutinous rice flour made from Zhenuo 106 by water milling was more suitable for the production of Ningbo glutinous rice balls. Its main quality index has reached the quality level of Ningbo glutinous rice balls, and it was the most suitable variety for this processing.
Study On The Determination Method Of Potato Peeling Rate, Li Shangzhen, Zhu Lixue, Zhang Shiang, Yang Songxia, Yao Huaping, Huang Jianyu
Study On The Determination Method Of Potato Peeling Rate, Li Shangzhen, Zhu Lixue, Zhang Shiang, Yang Songxia, Yao Huaping, Huang Jianyu
Food and Machinery
Proposed a pixel ratio measurement method, and designs 3 different potato models and 3 different peeling rate orthogonal tests through the model verification method, to verify the determination method. The experimental results showed that there was no significant difference between the actual measured value and the theoretical calculated value of the potato model in the 95% confidence interval, which indicated that the proposed pixel ratio measurement method had a strong credibility in the calculation of the peeling rate of potato. This method is scientific and feasible to evaluate the peeling effect of potatoes, and can be used as an effective …
Research Progress Of Fish Primary Processing Equipment Andautomatic Monitoring Technology, Huang Jianbin, Cheng Fang
Research Progress Of Fish Primary Processing Equipment Andautomatic Monitoring Technology, Huang Jianbin, Cheng Fang
Food and Machinery
The research progresses of fish primary processing machinery at home and abroad were reviewed in this study. Moreover the automatic monitoring technology and its application in aquatic products processing were introduced, from two aspects of material processing quality and the equipment running status. This would help to improve the efficiency and quality of fish primary processing and promote technology upgrading of aquatic processing industry.
Review Of Numerical Simulation Of Fluid-Particle Food Thermal Processing Based On Heat And Mass Transfer Theory Of Porous Media, Yu Bingyan, Deng Li, Cheng Fen, Xu Jia, Shi Yu
Review Of Numerical Simulation Of Fluid-Particle Food Thermal Processing Based On Heat And Mass Transfer Theory Of Porous Media, Yu Bingyan, Deng Li, Cheng Fen, Xu Jia, Shi Yu
Food and Machinery
This review outlined the principle and development of mathematical model based on the theory of heat and mass transfer in porous media. The research emphasis and its progress of mathematical model in the development and application were analyzed from the aspects of evaporation description, parameter determination and definite conditions and so on. Thereafter, an introduction of the advantages and disadvantages of the porous media mathematical model which applied in food thermal processing were given. Moreover, the development prospects of porous media mathematical model applied to fluid-particles food thermal processing were also summarized，which provided a reference for the numerical simulation research …
Research Progress Of Determination Of Benzo-A-Pyrene In Edible Areca Nut, Fu Xiaomei, Li Zongjun, Zhao Zhiyou, Luo Fenglian
Research Progress Of Determination Of Benzo-A-Pyrene In Edible Areca Nut, Fu Xiaomei, Li Zongjun, Zhao Zhiyou, Luo Fenglian
Food and Machinery
Smoked areca nuts contain harmful substances such as benzo-a-pyrene on its surface, because they are cured in wood smoke in the initial processing process. People's health is seriously threatened by these harmful substances. It is crucial for people to monitor the residues of benzo-a-pyrene effectively in areca nut to ensure the food safety. The sources of benzo-a-pyrene pollution in edible areca nut and the pretreatment methods for detecting benzo-a-pyrene in edible areca nut are summarized in this study, and several instrumental methods for the determination of benzo-a-pyrene in food are also evaluated. Our study is helpful to improving deficiencies and …
Review On Ice Crystal Shape And Assisted Freezing Methods Of Quick-Frozen Food, Chen Cong, Yang Dazhang, Xie Jing
Review On Ice Crystal Shape And Assisted Freezing Methods Of Quick-Frozen Food, Chen Cong, Yang Dazhang, Xie Jing
Food and Machinery
In this paper, the food quick-freezing technology, the shape of ice crystal at different freezing rates and methods for observing ice crystals are described. The research progress of pressure-assisted freezing, electrostatic-assisted freezing and magnetic-assisted freezing in recent years is reviewed. The direct method can directly observe the ice crystal formed during the freezing process. The indirect method analyzes the ice crystal characteristics by observing the gap left by the ice crystal in the food after freezing. Pressure-assisted freezing can improve the super-cooling degree. When the pressure is released, the ice crystals formed by instantaneous freezing are fine and evenly distributed. …
Research Progress Of Trans-Critical Co2 Refrigeration Cycle System And Application, Xuan Fuchen, Xie Jing
Research Progress Of Trans-Critical Co2 Refrigeration Cycle System And Application, Xuan Fuchen, Xie Jing
Food and Machinery
In this review, the research progress of compressor, evaporator and air cooler in trans-critical CO2 refrigeration system was analyzed. It was concluded that the method of improving the refrigeration efficiency and the optimum heat transfer efficiency of the trans-critical CO2 refrigeration system was obtained. The application of trans-critical CO2 refrigeration cycle in CO2 automotive air conditioning, heat pump and food processing were also discussed. The problems of high system pressure in CO2 refrigeration cycle in heat pump were analyzed. Finally, it was proposed that the development of oil-free compressor in trans-critical CO2 refrigeration cycle …
Research Progress Of Cold Storage Type Incubator, Wang Xuesong, Xie Jing
Research Progress Of Cold Storage Type Incubator, Wang Xuesong, Xie Jing
Food and Machinery
With the development of phase change coolants and insulation technologies, it is expected that the cold storage incubators will be more economical, environmentally friendly, and durable, and have a positive impact on cold chain logistics and people's lives. Firstly, three types of organic, inorganic, and composite phase-change coolants used in cold storage incubators, as well as new cold storage agents such as microcapsule cold storage agents and nano-coolant developed in recent years were reviewed. Then, from thermal insulation materials and temperature fields, in terms of uniformity, the progress of design optimization of cold storage incubator were expounded, and the feasibility …
Preparation And Identification Of The Monoclonal Antibody Of Kunitz Trypsin Inhibitor From Soybean, Wang Yao, Li Yanhong, Cao Jinbo, Sun Yaning, Xing Yunrui, Chen Xiujin, Deng Ruiguang, Hu Xiaofei
Preparation And Identification Of The Monoclonal Antibody Of Kunitz Trypsin Inhibitor From Soybean, Wang Yao, Li Yanhong, Cao Jinbo, Sun Yaning, Xing Yunrui, Chen Xiujin, Deng Ruiguang, Hu Xiaofei
Food and Machinery
To prepare monoclonal antibodies against soybean Kunitz trypsin inhibitor (KTI) with good immunological characteristics. BALB/c mice were used to immunize with 50 μg of KTI, the antiserum titer and sensitivity were identified via indirect ELISA and indirect competitive ELISA. The mice which serum has better titer and sensitivity were selected for cell fusing, then he hybridoma cell strain which stabilization secreted KTI monoclonal antibody (mAb) were screened. Thereafter, mAb was prepared by inducing ascites in vivo and identified the immunological characteristics. The result indicated that the NO.1 mouse was confirmed to produce the antibody with the highest titre, IC50 …
Simultaneous Determination Of Flavonoids In Fruits Of Rosa Davurica Pall. By Hplc And Measurement Of Their Activities In Vitro, Di Song, Zhong Fangli, Zhang Xiaoli, Wang Xiaolin, Lei Yongping
Simultaneous Determination Of Flavonoids In Fruits Of Rosa Davurica Pall. By Hplc And Measurement Of Their Activities In Vitro, Di Song, Zhong Fangli, Zhang Xiaoli, Wang Xiaolin, Lei Yongping
Food and Machinery
Simultaneous determination of four flavonoids in extracts of the fruits of Rosa davurica pall.(FRDP) by high performance liquid chromatography (HPLC) was carried out, and the in vitro activities of extracts of FRDP, four flavonoids and their compound compatibility were measured by UV method. The results showed that the contents of hyperoside, rutin, quercetin and luteolin of the extract of FRDP were 607.98, 450.63, 187.32 and 12.68 μg/g respectively. The extracts of FRDP, four flavonoids and their compound compatibility all have certain antioxidant activities in vitro, and the activity of extracts of FRDP was stronger than that of compound compatibility. However, …
Effects Of Far-Infrared Radiation Temperature On The Moisture Transfer Of Kiwifruit Slices, Zeng Ya, Liu Yunhong, Zhang Jiayi, Xi Huihan, Hu Runrun
Effects Of Far-Infrared Radiation Temperature On The Moisture Transfer Of Kiwifruit Slices, Zeng Ya, Liu Yunhong, Zhang Jiayi, Xi Huihan, Hu Runrun
Food and Machinery
In order to explore the water diffusion characteristics of kiwifruit during far-infrared radiation drying, low-field nuclear magnetic resonance (LF-NMR) technology was applied to analyze the influence of radiation temperature on internal water states and moisture migration of kiwifruits during drying. The results showed that drying time decreased significantly with the increasing of radiation temperature, and the ratio of average drying rates at radiation temperatures of 120, 160, 200, 240 and 280 ℃ were 1.00∶1.30∶1.54∶2.00∶2.50 respectively. The effective moisture diffusivity values was in the range of 2.85×10-10~7.03×10-10 m2/s, which could be improved with the increase in …
Effects Of Leucine And Α-Ketoglutarate On The Weight, Serum, Visceral Organ Of Mice, Jin Shunshun, Yao Kang, Yin Yulong, Kang Baoju, Li Yuying, Wang Peng
Effects Of Leucine And Α-Ketoglutarate On The Weight, Serum, Visceral Organ Of Mice, Jin Shunshun, Yao Kang, Yin Yulong, Kang Baoju, Li Yuying, Wang Peng
Food and Machinery
Forty male C57BL/6 mice aged 4 weeks were selected and randomly divided into 4 groups. Mice in control groups drank normal water, while those in the experimental groups were treated 1.0% α-ketoglutarate acid (group Ⅰ), or 1.8% leucine (group Ⅱ), or 1.8% leucine and 1.0% α-ketoglutarate acid (group Ⅲ) via drinking water. The experimental lasted 35 days. The results showed as follows: ① The growth performance of group Ⅲ was 8.7%, 10.1%, and 10.4% lower than that of the groups control,ⅠandⅡ, respectively； ② Serum albumin in group Ⅲ was significantly higher than that of the groups control,ⅠandⅡ(P<0.05)； ③ The cardiac index of group Ⅲ increased by 19.3%, 13.6%, and 15.2%, respectively, compared with groups control,ⅠandⅡ； ④ The abdominal fat index of group Ⅲ was 24.1%, 10.0%, and 6.7% lower than that of groups control,ⅠandⅡ, the cross-sectional area of the gastrocnemius muscle of group Ⅲ was 46.9%, 20.2%, 27.9% higher than that of groups control,ⅠandⅡ, respectively. In summary, the combination of leucine and α-ketoglutaric acid can reduce the body weight of mice, strengthen the use of fat by organs, and increase the cross-sectional area of gastrocnemius muscle fibers.
Isolation, Purification And Identification Of Antimicrobial Peptides From Ovalbumin, Jiang Yuqing, Chi Yujie
Isolation, Purification And Identification Of Antimicrobial Peptides From Ovalbumin, Jiang Yuqing, Chi Yujie
Food and Machinery
The antimicrobial peptides derived from ovalbumin were prepared by Pepsin hydrolysis. High antibacterial components were obtained by ultrafiltration and Superdex peptide 10/300. The antibacterial activity of antibacterial peptides against E.coli and Salmonella was used as an experimental index to screen the best antibacterial component and then conducted the reversed high-efficiency liquid phase chromatographic separation. After measuring the antibacterial activity of the 9 components, it was found that the C3 component had the highest antibacterial activity and the diameters of bacteriostasis circles were (19.32±1.45) and (18.74±1.27) mm, respectively. Then, the structure of antimicrobial peptides was identified by HPLC (electrospray ionization-massspectrometry, HPLC-ESI-MS). …
Preparation And Characterization Of Lutein Loaded In Zein Nanoparticles, Jiao Yan, Han He, Chang Ying, Li Chong, Gao Jianwei
Preparation And Characterization Of Lutein Loaded In Zein Nanoparticles, Jiao Yan, Han He, Chang Ying, Li Chong, Gao Jianwei
Food and Machinery
The Zein-Lutein nanoparticles were prepared using zein as nanocarrier by anti-solvent method, and the structural characterization of the nanoparticles were studied. The optimal preparation process of Zein-Lutein was explored on the basis of single factor and orthogonal array experiments. The optimal preparation conditions were as followed: the ratio of the zein and lutein ratio was 20∶1, hydration time 150 min, hydration temperature 50 ℃, the coating rate of lutein 81.0%. Under the conditions, the average particle size was 398.3 nm, TEM images showed that the morphological and distribution of Zein-Lutein were changed when lutein was efficiently loaded into zein, and …
The Analysis Of The Hydrolysis Releases Of Bound Aroma Compounds And Glycosyl Composition In Rose Roxbuighii Juice, Peng Bangyuan, Ding Xiaojuan, Zhao Zewei, Ding Zhuhong
The Analysis Of The Hydrolysis Releases Of Bound Aroma Compounds And Glycosyl Composition In Rose Roxbuighii Juice, Peng Bangyuan, Ding Xiaojuan, Zhao Zewei, Ding Zhuhong
Food and Machinery
By using the GC-MS，the composition of the bound aroma compounds after enzymatic hydrolysis and acid hydrolysis were analyzed, and the bound aroma compounds in Amberlite XAD-2 from Rose roxbuighii juice were also detected. According to the analysis of ROAV value, the emblematical aroma compounds were analyzed. Thereafter, the glycosyl composition of the bonded flavor compounds were also determined the characteristics of the hydrolyzable bonded compounds. The result showed that a total of 49 kinds of aroma substances were detected after the enzymatic hydrolysis and acid hydrolysis of Rose roxbuighir juice. 31 kinds of aroma substances were obtain by enzyme hydrolysis. …
Changes And Migration Of Volatile Flavor Components In Freeze-Dried Peaches, Yan Qiuju, Wang Haiou, Zhu Hua, Wu Yulong, Zhou Feng, Wang Zhenjiong, Wang Renlei, Hua Chun
Changes And Migration Of Volatile Flavor Components In Freeze-Dried Peaches, Yan Qiuju, Wang Haiou, Zhu Hua, Wu Yulong, Zhou Feng, Wang Zhenjiong, Wang Renlei, Hua Chun
Food and Machinery
The composition and content of main volatile flavor components in fresh peach, freeze-dried peach and lyophilizer cold trap water were compared and analyzed by SPME-GC/MS. The results showed that there were 26, 18 and 11 volatile flavor components in fresh peach, freeze-dried peach and cold trap water, respectively. They mainly included aldehydes, alcohols, esters, hydrocarbons, heterocyclics and ethers. Volatile flavor components in fresh peaches changed and migrated during freeze-drying. The retained volatile flavor components in the freeze-dried peach mainly included hexanal, (E)-2-heptenal, (E)-2-octenal, benzaldehyde, pentanol, hexanol, (E)-2-hexen-1-ol, hexyl acetate, hexyl acetate, and γ-caprolactone. Furfural and diethylene glycol ether completely migrated …
Cloning Of Aflatoxin-Detofizyme Gene And Fusion Expression In Escherichia Coli, Li Wang, Shi Dunsheng, Ding Ke, Cao Pinghua, Zhao Longmei
Cloning Of Aflatoxin-Detofizyme Gene And Fusion Expression In Escherichia Coli, Li Wang, Shi Dunsheng, Ding Ke, Cao Pinghua, Zhao Longmei
Food and Machinery
The ADTZ gene primers were synthesized through the ADTZ gene sequence published by GenBank. The ADTZ gene fragment was screened by PCR from the mixed bacterial solution which extracted of the moldy corn sample, and transformed into E. coli by constructing expression vector. The size and concentration of the ADTZ expression product were detected by SDS-PAGE. The degradation ability of the expression product to aflatoxin AFB1 was tested by enzymatic hydrolysis. The results showed that the ADTZ gene was successfully amplified from the moldy maize suspension. The full length of the ADTZ gene sequence was 2 088 bp, and …
Optimization Of Conditions For Efficient Expression Of Recombinant Cellulose-Binding Domain-Glutamate Decarboxylase Of Enterococcus Faecium In Escherichia Coli, Yang Shengyuan, Lin Qian, Zhang Xiaoning, Zhen Jiayi
Optimization Of Conditions For Efficient Expression Of Recombinant Cellulose-Binding Domain-Glutamate Decarboxylase Of Enterococcus Faecium In Escherichia Coli, Yang Shengyuan, Lin Qian, Zhang Xiaoning, Zhen Jiayi
Food and Machinery
In order to avoid the interference of natural GAD expressed by the own genome of Escherichia coli, the recombinant cellulose-binding domain glutamate decarboxylase (CBD-GAD) was firstly immobilized by regenerated amorphous cellulose (RAC), and then the RAC-CBD-GAD immobilized enzyme was isolated and used as an evaluation index to optimize the culture conditions for highly efficient expression of CBD-GAD in E. coli GDMCC60445 by one-factor-at-a-time and Taguchi methods. The results indicated that the optimal medium for E. coli GDMCC60445 to express CBD-GAD was modified Luria-Bertani (LB) medium, which was consisted of 8 g/L tryptone, 6 g/L yeast extract, 10 g/L sodium chloride, …
Application Of 3d Scanning Method In Radio Frequency Heating Simulation, Zhang Ruyi, Li Feng, Jiao Yang
Application Of 3d Scanning Method In Radio Frequency Heating Simulation, Zhang Ruyi, Li Feng, Jiao Yang
Food and Machinery
In order to improve the simulation accuracy, this paper took potatoes as examples, selected two irregular-shape potatoes, used a three-dimensional scanner to obtain the accurate geometries, imported the geometries into a multiphysics finite element software COMSOL Multiphysics, solved its temperature distribution field under different powers/voltages, and carried experiment verifications. Results show that after 40 minutes of RF heating, the temperature distribution, maximum and minimum temperature values and internal time-temperature curves of the simulated results are in good agreement with the experimental results with a simulation accuracy over 90%. This method is suitable for simulating RF heating processes of …
Study On The Dynamics Of Quality Changes In The Process Of Western-Style Ham Cooking, Shi Yu, Deng Li, Xie Le, Yu Bingyan, Liao Xiaomei, Su Jieyu
Study On The Dynamics Of Quality Changes In The Process Of Western-Style Ham Cooking, Shi Yu, Deng Li, Xie Le, Yu Bingyan, Liao Xiaomei, Su Jieyu
Food and Machinery
The stability and reliability of kinetic parameters can help enterprises to better predict food quality and use resources efficiently. In this study, the changes of mature quality factors (color and shear-force) and overheating quality factors (moisture and content) in the process of western-style ham cooking were measured and analyzed by kinetic methods. The results showed that in the process of cooking, the changes of color, the moisture content and shear-force of western-style ham followed the first-order reaction kinetics. The z-values of the luminance value and the redness value were 49.69 ℃ and 41.85 ℃, respectively, and the Ea-values were 46.73 …
Effect Of Ultrasonic Treatment On The Rheological Properties Of Liquid Whole Egg, Bai Xiting, Zhu Wenxue, Ma Yitong, Liu Sijia, Li Ning
Effect Of Ultrasonic Treatment On The Rheological Properties Of Liquid Whole Egg, Bai Xiting, Zhu Wenxue, Ma Yitong, Liu Sijia, Li Ning
Food and Machinery
In order to study the effect of ultrasonic treatment on the rheological properties of liquid whole egg, the different ultrasonic energy density (0.4, 0.8, 1.2, 1.6, and 2.0 W/g) and the ultrasonic time (0, 5, 10, 15, and 20 min) on the liquid whole egg were studied, and then the rheological properties of rheometer was measured. The static rheological experimental results showed that the egg was a pseudoplastic non-Newtonian fluid with the shear thinning phenomenon. The rheological curve was obedient to the Herschel-Bulkley model at the temperature of 0~40 ℃. With the increase of ultrasonic time and ultrasonic energy density, …
Composition Of Sn-2 Fatty Acids In Yak Milk Fat From Qinghai Province, Feng Xiya, Zhang Yu, Suo Huayi, Wang Hongwei
Composition Of Sn-2 Fatty Acids In Yak Milk Fat From Qinghai Province, Feng Xiya, Zhang Yu, Suo Huayi, Wang Hongwei
Food and Machinery
The composition of Sn-2 fatty acids in yak milk fat was determined by gas chromatograph and TLC. The Sn-2 fatty acid composition of yak milk fat at different altitudes was studied to determine the effect of different altitudes on triglyceride structure. The results showed that there were 12 kinds of total fatty acids of triglyceride in Qinghai yak milk fat, and the highest contents were palmitic acid (31.35%～36.48%), oleic acid (24.91%～30.99%) and stearic acid (9.82%～13.87%). The composition of Sn-2 fatty acids in Qinghai yak milk fat was as follows: hexanoic acid (0.66%～1.02%), decanoic acid (2.46%～3.98%), lauric acid (2.43%～4.88%), tetradecanoic acid …
Exploration Of The Formation And Mechanism Of Vbnc State Of Salmonella Enterica Serovar Typhimurium During Hydrogen Peroxide Disinfection, Nie Xinying, Liao Hongmei, Liu Yuanfa
Exploration Of The Formation And Mechanism Of Vbnc State Of Salmonella Enterica Serovar Typhimurium During Hydrogen Peroxide Disinfection, Nie Xinying, Liao Hongmei, Liu Yuanfa
Food and Machinery
In order to determine the effective bactericidal concentration of hydrogen peroxide, Salmonella enterica serovar Typhimurium was used as a target microorganism to explore the effect of hydrogen peroxide on activity and culturability of it in tap water and its viable but non-culturable (VBNC) state by means of molecular biology. The results showed that lower hydrogen peroxide concentration (0～15 mmol/L) could kill some S. Typhimurium, which could be completely sterilized with 1 mol/L hydrogen peroxide. It was also found that 4.08 lg(CFU/mL) S. Typhimurium could be induced into a VBNC state as exposure to 15 mmol/L hydrogen peroxide. The morphology and …
Establishment Of Trace Pentachlorophenol And Its Sodium Salt In Animal-Origin Foods By Automated Solid Phase Extraction-Coupled With Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry, Chen Yanhong, Chen Sui, Song Anhua, Huang Jingchu, Chen Yueming, Liu Jia, Wang Yu
Establishment Of Trace Pentachlorophenol And Its Sodium Salt In Animal-Origin Foods By Automated Solid Phase Extraction-Coupled With Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry, Chen Yanhong, Chen Sui, Song Anhua, Huang Jingchu, Chen Yueming, Liu Jia, Wang Yu
Food and Machinery
In order to develop a method for the determination of trace pentachlorophenol and its sodium salt in animal-origin foods by automated solid phase extraction-coupled with ultra performance liquid chromatography-tandem mass spectrometry, the effects of extractive solvents, solid phase extraction columns, eluents, mass spectrum and chromatographic separation conditions, internal standards were studied and compared. Finally, the sample was extracted by 5% ammonia acetonitrile, purified by MAX solid phase extraction column and eluted by 10% formic acid methanol. The extract was dried-up with nitrogen and re-dissolved with acetonitrile water solution (50∶50)．The solution was separated on a Kinetex C18 column (100 mm×2.1 …
Simultaneous Determination Of Traditional And New Types Of “Lean Meat Powder” In Pork By Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry, Liu Di, Han Li, Huang Kun, Wang Bin, Wang Heng, Yu Tingting, Wang Huixia
Simultaneous Determination Of Traditional And New Types Of “Lean Meat Powder” In Pork By Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry, Liu Di, Han Li, Huang Kun, Wang Bin, Wang Heng, Yu Tingting, Wang Huixia
Food and Machinery
An analytical method for the simultaneous determination of new and traditional "lean meat powder"（Clenbuterol, Salbutamol, Ractopamine, Terbutaline, Isoprophane, Chlorpheniramine, Simmatrol, Fenoterol and Olaquindox and its metabolites） in pork by ultra performance liquid chromatography-tandem mass spectrometry was established. Pork samples were extracted with 2% formic acid-acetonitrile solution. The extracts were purified by neutral alumina column. After being dried and concentrated by nitrogen, the hexane was degreased and determined by ultra performance liquid chromatography-tandem mass spectrometry and quantified by internal standard method. Waters HSS C18 column (100 mm×2.1 mm, particle size 1.8 μm) was used. The mobile phase was separated by …
Uncertainty Evaluation Of Determination Of L-Hydroxyproline In Raw Milk By High Performance Liquid Chromatography-Tandem Mass Spectrometry, Kang Ning, Guo Lili, Liu Xiaolin, Hua Jin, Gao Lizhen
Uncertainty Evaluation Of Determination Of L-Hydroxyproline In Raw Milk By High Performance Liquid Chromatography-Tandem Mass Spectrometry, Kang Ning, Guo Lili, Liu Xiaolin, Hua Jin, Gao Lizhen
Food and Machinery
The content uncertainty of L-hydroxyproline in dairy products was evaluated by referring to SN/T 3929—2014 “Determination of L-hydroxyproline in export foods”. According to JJF 1059.1—2012 “Measurement uncertainty evaluation and expression”, and CNAS—GL006:2019 “The evaluation guidance for uncertainty in chemical analysis”, and these two existing standards for evaluation of uncertainty of the basic procedures, a mathematical model was established for the analysis of determination of L-hydroxyproline content in dairy products by high performance liquid chromatography tandem mass spectrometry, which introduced in the process of the measurement uncertainty components. The measured results of synthetic standard uncertainty and expanded uncertainty were obtained by …
Uncertainty Evaluation Of Pesticide Residues In Vegetable Based On Gray Model, Cheng Fuan, Zhang Jiayan, Feng Xugang, Gao Wenbin, Qian Muyun
Uncertainty Evaluation Of Pesticide Residues In Vegetable Based On Gray Model, Cheng Fuan, Zhang Jiayan, Feng Xugang, Gao Wenbin, Qian Muyun
Food and Machinery
The uncertainty of pesticide residues in vegetables is an important indicator to judge whether the detection of pesticide residues is good or not in quality, which is too difficult to evaluate if the distribution function of the detected value is unknown. This study proposes an evaluation method based on the gray model to solve this problem. Steps are adopted as follows: first of all, detect the nine sorts of organochlorine and pyrethroid pesticide residues in vegetables by use of gas chromatography; secondly, establish, taking the detection of pesticide residues as a kind of gray process, the mathematical model of gray …
Research On Early Warning And Evaluation Of Food Safety Network Public Opinion Based On Interval Analytic Hierarchy Process, Gao Ying
Food and Machinery
Aiming at the uncertainty of online public opinion early warning and evaluation for food safety, a new online public opinion early warning and evaluation method for food safety was proposed. Firstly, a multi-level evaluation index system of public opinion early warning in the food safety network was established, and the warning grade and interval number grade of public opinion in the food safety network was put forward. The interval number weight of public opinion early warning evaluation index in the food safety network was determined by interval analytic hierarchy process. Then, combining with the interval number theory, an early warning …
Design And Development Of Avertical Multi-Station Lotus Core Puncher, Wang Wangping, He Liu, Wang Yiquan, Zhang Yonglin, Yu Nanhui
Design And Development Of Avertical Multi-Station Lotus Core Puncher, Wang Wangping, He Liu, Wang Yiquan, Zhang Yonglin, Yu Nanhui
Food and Machinery
In view of the current of dry lotus core punching, a vertical multi-station lotus core puncher has been designed and developed. This paper introduces the whole structure and the working of the puncher, and maltese mechanism, positioning and clamping mechanism and space cam mechanism are explained in detail. The results of prototype test indicated that the once punching rate of no less than 92%, the thorough punching rate of no less than 85% and the broken rate of kernels of less than 5%.
Application Of Nurbs Curve In Rotor Profile Design Of Roots Pump, Liu Zhenchao, He Xueming, Huang Hainan
Application Of Nurbs Curve In Rotor Profile Design Of Roots Pump, Liu Zhenchao, He Xueming, Huang Hainan
Food and Machinery
A design method of roots pump rotor profile based on NURBS curve was proposed. Combining the design process from peak curve to valley curve, the reasonable design area of peak curve was designed, and the envelope condition of NURBS curve was solved. The method of determining the rotor profile of roots pump with NURBS curve by control point and weight factor was designed. The method redesigned the involute rotor profile and the average error was in 0.1 μm which was in a reasonable error range. The feasibility of designing Roots pump rotor profile with NURBS curve was verified. Finally, the …