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Articles 2041 - 2070 of 5782
Full-Text Articles in Food Processing
Storage Properties Of Walnuts Dried By Drum Catalytic Infrared-Hot Air, Qu Wen-Juan, Fan Wei, Ma Hai-Le, Shi Jun-Ling, Jiang Qun-Hui, Pan Zhong-Li
Storage Properties Of Walnuts Dried By Drum Catalytic Infrared-Hot Air, Qu Wen-Juan, Fan Wei, Ma Hai-Le, Shi Jun-Ling, Jiang Qun-Hui, Pan Zhong-Li
Food and Machinery
The kinetic processes of oxidative rancidity reaction of walnut under different storage temperatures and times were studied, by using acid value and peroxide value as evaluation indexes. The prediction models for evaluating the shelf life of walnut under different storage temperatures were established. The results showed that the acid and peroxide values of walnut increased with the prolonging of storage time. The increases of walnut acid and peroxide values were the lowest in the treatment of combined drying of drum catalytic infrared with a variable temperature and hot air. After 90 days of storage, the acid and peroxide values of …
Optimization Of Ultrasonic-Assisted Extraction Technology Of Flavonoids From Pomelo Leaves And Its Antioxidant And Antibacterial Capabilities, Qiu Yuan-Xin, Zhang Ze-Xiong, He Di, Cai Jian-Chang, Liu Jian-Liang
Optimization Of Ultrasonic-Assisted Extraction Technology Of Flavonoids From Pomelo Leaves And Its Antioxidant And Antibacterial Capabilities, Qiu Yuan-Xin, Zhang Ze-Xiong, He Di, Cai Jian-Chang, Liu Jian-Liang
Food and Machinery
Taking pomelo leaves as the research object, the total flavonoids of pomelo leaves were extracted with the aid of ultrasound, and its antioxidant and antibacterial abilities were explored. The results showed that the optimal extraction conditions for flavonoids from pomelo leaves were ethanol volume fraction 80%, ultrasonic time 50 min, solid-liquid ratio 1∶25 （g/mL）, and the flavonoid content under these conditions was 11.746 mg/g. The antioxidant test results showed that the total reducing power of the preliminary extraction of pomelo leaf flavonoids was about 1.25 times that of the same mass concentration of ascorbic acid. In addition, the inhibitory effect …
Study On Total Flavonoids Extract And Antioxidant Capacity Of Flemingia Macrophylla, Wang Yan, Yu Lu, Gao Jian-Wei, Lin Wei, Bo Li-Ying
Study On Total Flavonoids Extract And Antioxidant Capacity Of Flemingia Macrophylla, Wang Yan, Yu Lu, Gao Jian-Wei, Lin Wei, Bo Li-Ying
Food and Machinery
The extraction process conditions of total flavonoids from Flemingia macrophylla were optimized, and the extract's antioxidant properties were also studied. Firstly, the single factor test and response surface test were applied to optimize the alcohol reflux extraction process, and the antioxidant activity of the extract was finally evaluated. It was found that the best extraction time was 52 min, material-liquid ratio 1∶6 (g/mL), ethanol volume fraction 70%, extraction temperature 60 ℃. Rutin was used as the standard substance, the total flavonoid content of the extract is 75.47 μg/mg; the IC50 of the extract for ABTS+· and DPPH· scavenging was …
Isolation, Purification, Structural Characterization Of Polysaccharide From Camellia Nitidissima Chi And Its Antioxidant Activities In Vitro, Gong Wen, Tang Jie, Wei Ya-Yuan, Ning En-Chuang, Wei Lu
Isolation, Purification, Structural Characterization Of Polysaccharide From Camellia Nitidissima Chi And Its Antioxidant Activities In Vitro, Gong Wen, Tang Jie, Wei Ya-Yuan, Ning En-Chuang, Wei Lu
Food and Machinery
The polysaccharide of Camellia Nitidissima Chi was extracted by water extraction and alcohol precipitation, and the polysaccharide was purified by DEAE cellulose anion exchange classification to obtain TPS1, TPS2 and TPS3;The molecular weight, monosaccharide composition and microstructure of TPS1, TPS2 and TPS3 were analyzed by gel permeation chromatography, pre-column PMP derivatization and HPLC and fourier transform infraredspectrometer （FTIR）, and the antioxidant activity of TPS1, TPS2 and TPS3 were studied in vitro. The results were described as followed. TPS1 was mainly composed of glucose, galactose and arabinose, and was a heteropolysaccharide composed of two polysaccharides with different molecular weights（1.55×105, …
Effect Of Different Drying Process On The Quality Of Black Tea, Hu Yuan, Liu Meng-Yuan, Zhou Qin-Yu, Xu Yang-Yang, Xiao Wen-Jun
Effect Of Different Drying Process On The Quality Of Black Tea, Hu Yuan, Liu Meng-Yuan, Zhou Qin-Yu, Xu Yang-Yang, Xiao Wen-Jun
Food and Machinery
In order to investigate the influence of different drying process on the quality of black tea, the fresh leaves with one bud and two leaves of tea plant varieties' 'Bixiangzao' were picked as raw materials for processing black tea during late summer and early autumn, and different drying methods of the box type hot air, pan fry, chain hot air, plate type hot air and microwave and its combination were applied to the initial drying and the re-drying process after the withering, curling and fermenting process of black tea, and then the sensory quality, taste and aroma ingredients of different …
Optimization Of Enzymatic Hydrolysis Of Spanish Mackerel Byproducts For Seafood Sauce Processing, Zheng Rui-Sheng, Lin Ya-Ping, Sun Qiu-Qiong, Zhang Bing-Quan, Zheng Zong-Ping
Optimization Of Enzymatic Hydrolysis Of Spanish Mackerel Byproducts For Seafood Sauce Processing, Zheng Rui-Sheng, Lin Ya-Ping, Sun Qiu-Qiong, Zhang Bing-Quan, Zheng Zong-Ping
Food and Machinery
The enzymatic hydrolysis experiments on the water extract of Spanish mackerel byproducts were conducted. Through single factor and orthogonal enzymolysis experiments, the enzymatic hydrolysis process of mackerel byproducts was optimized, and the enzymatic hydrolysate was used to process seafood sauce. The sensory quality between the commercial and the homemade seafood sauces were compared and analyzed. The results show that the best enzymatic hydrolysis technology for Spanish mackerel byproducts were gained as follow: the amount of neutral protease of 500 U/g, the ratio of liquid to material of 3∶1, the enzymatic hydrolysis temperature of 55 ℃, the pH of 7.5, and …
Influence Of Cigarette Paper Parameters On Cigarette Ash Holding Capacity, Li Huan, Wang Jian-Min, Wang Hao-Li, Dai Cun-Di
Influence Of Cigarette Paper Parameters On Cigarette Ash Holding Capacity, Li Huan, Wang Jian-Min, Wang Hao-Li, Dai Cun-Di
Food and Machinery
In order to explore the influence of cigarette paper on ash holding capacity under smoking and burning conditions, 12 cigarette samples with different cigarette paper parameter combinations were designed and prepared by uniform experimental design with quantitative, air permeability, magnesium carbonate addition, sodium potassium ratio of combustion supporting agent, acid radical type and combustion supporting agent dosage as parameters. The effects of cigarette paper parameters on ash holding capacity were studied by single factor analysis and regression analysis The parameters of cigarette paper were optimized. Results: ① with the change of cigarette paper parameters, the ash holding capacity ranged from …
Research Progress Of Bionic Chewing Device And Its Application In Food Texture Evaluation, Xie Gui-Lin, Zhao Qi, Guo Yi-Fei, Wang Chao, Mao Qian
Research Progress Of Bionic Chewing Device And Its Application In Food Texture Evaluation, Xie Gui-Lin, Zhao Qi, Guo Yi-Fei, Wang Chao, Mao Qian
Food and Machinery
Based on the domestic and abroad research status of the bionic chewing device, its theoretical simulation and application were summarized, and the development direction was also prospected.
Problems And Countermeasures On The Development Of Poultry Egg Industry In China Under The Normalized Background Of Covid-19 Control And Prevention, Liu Ying, Li Shu-Gang, Li Xiu-Ting, Ma Mei-Hu, Dong Shi-Jian, Gao Ying
Problems And Countermeasures On The Development Of Poultry Egg Industry In China Under The Normalized Background Of Covid-19 Control And Prevention, Liu Ying, Li Shu-Gang, Li Xiu-Ting, Ma Mei-Hu, Dong Shi-Jian, Gao Ying
Food and Machinery
This paper analyzed the impact of COVID-19 on China's egg production and the causes, and explored the bottleneck problems in the development process of the egg industry. The effective countermeasures for the development of China's poultry egg industry under the normal epidemic situation were discussed from the perspectives of the government, enterprises, scientific research and consumers.
Market Situation, Trend And Development Strategy Of Sports Nutrition Food, Xie Kai
Market Situation, Trend And Development Strategy Of Sports Nutrition Food, Xie Kai
Food and Machinery
The scale, segmentation, competition pattern and functional types of sports nutrition food market at home and abroad were analyzed. It was found that the sports nutrition food market is expanding from core users to new consumers such as young women, professionals and the elderly. As a result, differentiated development in form and service has become the mainstream, market competition, and diversified marketing channel development. The future development of sports nutrition food should further use Internet thinking to strengthen consumer operation, adhere to the development strategy of multi-dimensional combination and improve the industry standard of sports nutrition food.
Nutritional Risk And Management Measures Under Covid-19 Epidemic, Qiu Sheng
Nutritional Risk And Management Measures Under Covid-19 Epidemic, Qiu Sheng
Food and Machinery
From the perspective of nutrition, this paper mainly analyzed the nutritional risks faced by the post-epidemic era, proposed corresponding nutrition management measures for COVID-19 patients, revealed the importance of nutritional intervention in assisting the treatment of COVID-19, and put forward suggestions for the general public to achieve a reasonable nutritious diet.
Analysis Of Anthocyanins In Purple Sweet Potato Wine Before And After Fermentation By Uplc-Ms/Ms, Yuan Jiang-Yue, He Jia, Sun Jun-Jie, Rui Peng, Liu Xi-Ming
Analysis Of Anthocyanins In Purple Sweet Potato Wine Before And After Fermentation By Uplc-Ms/Ms, Yuan Jiang-Yue, He Jia, Sun Jun-Jie, Rui Peng, Liu Xi-Ming
Food and Machinery
The type and content of anthocyanins in the key production process of purple sweet potato wine were analyzed by ultra performance liquid chromatography-tandem quadrupole mass spectrometry （UPLC-MS/MS）. Results 8 kinds of anthocyanins with large structural differences were identified, and various anthocyanins had different changes before and after fermentation; after high-temperature cooking, the anthocyanin species in the purple sweet potato did not change, but the total anthocyanin content decreased; After being fermented into purple sweet potato wine, the yield of 8 anthocyanins is about 30%.
Prediction Of Soluble Solids In Hami Melon By Cars-Svm, Guo Yang, Guo Jun-Xian, Shi Yong, Li Xue-Lian, Liu Yan-Cen, Huang Hua, Li Ze-Ping
Prediction Of Soluble Solids In Hami Melon By Cars-Svm, Guo Yang, Guo Jun-Xian, Shi Yong, Li Xue-Lian, Liu Yan-Cen, Huang Hua, Li Ze-Ping
Food and Machinery
Soluble solid content is one of the important indexes for the internal quality analysis of Hami melon. In this study, the prediction model of soluble solid content of Hami melon was established by using near infrared spectroscopy combined with data dimension reduction method. Compared with a variety of spectral preprocessing methods, the second-order derivative was used to process the original spectrum; the preprocessed spectral data were combined with CARS and MC-UVE to extract the characteristic wavelength, and the principal component analysis was used to reduce the dimension; Finally, the spectral data of feature selection and feature extraction were used as …
Research On Omnidirectional Handling Robot Path Tracking Control Based On Improved Fuzzy Pid, Zhang Pin, Li Chang-Yong
Research On Omnidirectional Handling Robot Path Tracking Control Based On Improved Fuzzy Pid, Zhang Pin, Li Chang-Yong
Food and Machinery
Based on state of robot, an improved tracking control method which takes the tracking error as an input and the drive voltage of the motor as an output is proposed. A theoretical domain deflation factor is added to automatically adjust the fuzzy controller, and the range of parameters was determined preliminarily by experimental measurement. Then the sparrow population was initialized by adding a reverse learning strategy, and a weight factor was designed to control the proportion of followers close to the finder to prevent precocity. The results show that the improved sparrow algorithm performs better than the original algorithm in …
Effect Of Alternating Magnetic Field On Quality Of Frozen Pork And Beef, Ma Guo-Jiao, Jin Ya-Mei, Yang Na, Xu Xue-Ming, Xie Zheng-Jun
Effect Of Alternating Magnetic Field On Quality Of Frozen Pork And Beef, Ma Guo-Jiao, Jin Ya-Mei, Yang Na, Xu Xue-Ming, Xie Zheng-Jun
Food and Machinery
The effects of alternating magnetic fields on the quality of pork and beef during frozen storage for 2, 4, 6, and 8 weeks were discussed. The results showed that compared with the control group, the pork and beef samples had a faster cooling rate and the freezing point was reduced by 0.9 ℃ and 0.5 ℃, and the phase transition time had been shortened by 66.67% and 65.00% respectively under the action of a 1 mT alternating magnetic field. Furthermore, dry loss and drip loss were reduced, and the water content was higher, and the water-holding capacity of samples in …
Effect Of Frozen Storage Time On The Physicochemical Property Of Different Type Of Raw Meat, Guo Yun-Kai, Yu Li-Gang, Yang Yu-Kun, Guo Cai-Xia, Li Mei-Ping
Effect Of Frozen Storage Time On The Physicochemical Property Of Different Type Of Raw Meat, Guo Yun-Kai, Yu Li-Gang, Yang Yu-Kun, Guo Cai-Xia, Li Mei-Ping
Food and Machinery
In this study, color, cooking loss, water holding capacity, water-loss rate, pH value, amino acid and fatty acid composition of raw meat were investigated during storage （0, 1, 2, 4, 8 weeks） at -18 ℃. The results indicated that water-loss rate and cooking loss of meat increased as the storage time increased, and water holding capacity of meat decreased with the increasing storage time （P<0.05）. The contents of lysine, alanine and cysteine increased with the increasing storage time. The amounts of saturated fatty acids increased obviously, while polyunsaturated fatty acids contents decreased with the increasing storage time. Therefore, although frozen storage is an ideal method for meat storage. However, the nutritive value of raw meat will change, leading to the decline of meat quality.
Effects Of Raw Material Characteristics And Printing Parameters On Product Quality Infood 3d Printing, Zhang Peng-Hui, Zhou Hao-Yu, Nie Yuan-Yang, Li Bo
Effects Of Raw Material Characteristics And Printing Parameters On Product Quality Infood 3d Printing, Zhang Peng-Hui, Zhou Hao-Yu, Nie Yuan-Yang, Li Bo
Food and Machinery
In this paper, the 3D printing characteristics of starch, hydrophilic colloid, meat and other food materials were reviewed. The effects of printing parameters such as printing temperature, printing speed, internal filling rate and printing nozzle diameter on 3D product quality were analyzed, so as to provide useful reference for the research of food 3D printing technology and the development of printing food materials.
Development Of A Portable Low-Moisture Food Pasteurization Device Using Rf Heating, Eric Jason Ohata
Development Of A Portable Low-Moisture Food Pasteurization Device Using Rf Heating, Eric Jason Ohata
Master's Theses
Bacterial presence in low-moisture foods such as flour, cereals, baby formula, and spices, have become a concern due to sanitizing challenges. The food industry currently focuses on wet food sanitation as opposed to low-moisture foods because of bacteria’s inability to reproduce in low water activity media. Traditionally, food processing RF heating pasteurizes in mass quantities while an equivalent consumer device does not exist the market today. A consumer product would help eliminate food waste by providing an easy way to sanitize food and extend shelf life. The Portable Food Pasteurization (PFP) project is an interdisciplinary project involving the Electrical Engineering, …
The Application Practice Of Nutri-Score Labeling And Its Enlightenment To China, Huang Ze-Ying, Huang Bei-Xun
The Application Practice Of Nutri-Score Labeling And Its Enlightenment To China, Huang Ze-Ying, Huang Bei-Xun
Food and Machinery
Nutri-score labeling's promotion, implementation effect, algorithm, comparison with related FOP labels were elaborated, and then our study summarized application practice, and put forward the enlightenment for implementation of the FOP labeling in China.
The Research On Scavenging Nitrogen Radical Ability Of Reduced Pyrroloquinoline Quinone, Ma Ke, Wu Zhen-Zhen, Yang Xue-Peng
The Research On Scavenging Nitrogen Radical Ability Of Reduced Pyrroloquinoline Quinone, Ma Ke, Wu Zhen-Zhen, Yang Xue-Peng
Food and Machinery
The changes were discussed in the scavenging rate of ABTS free radicals of reduced pyrroloquinoline quinone (PQQH2) under different mass concentrations and different reaction time conditions. The primary and secondary reaction kinetic models were established. With conventional antioxidant vitamin C as a control, the scavenging performance of PQQH2 on ABTS free radicals was studied. Results: The higher of the concentration of PQQH2 and the longer the time were, the higher of the scavenging rate of ABTS free radicals was. After 25 minutes of reaction, the scavenging rate of 70 mg/L PQQH2 could reach more than …
Variations Of Physicochemical Properties Of Starch In Bitter Melon Function Rice, Yang Yong-Jian, Yuan Jie, Tao Xiang-Lin, He Yan, Tang Han-Jun
Variations Of Physicochemical Properties Of Starch In Bitter Melon Function Rice, Yang Yong-Jian, Yuan Jie, Tao Xiang-Lin, He Yan, Tang Han-Jun
Food and Machinery
The particle morphology, particle size distribution, crystal structure, gelatinization, gel texture and molecule properties of indica rice starch of importing bitter melon DNA （D9） were compared with its receptor. The results showed that the volume percentage of D9 starch <3 μm increased significantly, while the volume percentage of large granule >9 μm decreased. The molecular ordering index values of D9 starch were 0.67 and 1.66 respectively, which were significantly higher than those of receptor, 0.60 and 1.18; while the pasting temperature of differential scanning calorimetry was 65.5 ℃, which was significantly lower than that of receptor 77.8 ℃. The highest viscosity, the minimum viscosity, disintegration value and final viscosity of D9 …
Isolation, Identification And Enzyme Production Characteristics Of Culturable Bacteria In The Air Of High-Temperature Daqu Fermentation Room, Huang Zhi-Guo, Liu Na, Wei Chun-Hui, Deng Jie, Zhong Shu-Xia, Chen Bo, Ren Zhi-Qiang
Isolation, Identification And Enzyme Production Characteristics Of Culturable Bacteria In The Air Of High-Temperature Daqu Fermentation Room, Huang Zhi-Guo, Liu Na, Wei Chun-Hui, Deng Jie, Zhong Shu-Xia, Chen Bo, Ren Zhi-Qiang
Food and Machinery
Taking the cultivable bacteria in the air of high-temperature Daqu fermentation room as the research objects to study the characteristics of separation, identification and enzyme production. The cultivable bacteria were used to take liquid state fermentation in sorghum mash, and the metabolites were analyzed by gas chromatography-mass spectrometry. Results: 8 strains were isolated from the air in the high-temperature Daqu fermentation room, and they were: Bacillus amyloliquefaciens, Bacillus subtilis, Bacillus cereus, Pedobacter suwonensis, Sphingomonas sanguinis, Massilia sp., Delftia sp. and Sphingobacterium sp.. After the enzyme production tests, three dominant functional bacteria, Bacillus subtilis, Bacillus amyloliquefaciens, and Bacillus cereus, which all …
Isolation And Identification Of Two Acid Resistant Lactic Acid Bacteria From Traditional Pickles, Feng Jin-Xiao, Li Ming-Zhu, Li Cui-Ping, Yan Wen-Di
Isolation And Identification Of Two Acid Resistant Lactic Acid Bacteria From Traditional Pickles, Feng Jin-Xiao, Li Ming-Zhu, Li Cui-Ping, Yan Wen-Di
Food and Machinery
A total of 8 strains of bacteria were isolated from 6 pickle samples in Northeast, Shandong, Guizhou, Sichuan and other places. Using simulated gastric acid experiments， morphological observations, physiological and biochemical experiments, lactic acid bacteria qualitative experiments, two strains of lactic acid bacteria with high survival rate under pH 2.5 conditions were obtained by simulation experiment. After 16S rDNA sequencing, it was determined that the two acid-resistant lactic acid bacteria were Lactobacillus brevis isolated from Shandong sugar garlic pickles numbered Shandong SRB and Lactobacillus casei isolated from Northeast sauerkrautnumbered Northeast HS.
Effects Of Enterobacter Fermentation On Chemical Components Of Tobacco Extract And Cigarette Quality, Ye Jian-Bin, Qi Xiao-Na, Yang Zong-Can, Zhang Ting-Ting, Feng Ying-Jie
Effects Of Enterobacter Fermentation On Chemical Components Of Tobacco Extract And Cigarette Quality, Ye Jian-Bin, Qi Xiao-Na, Yang Zong-Can, Zhang Ting-Ting, Feng Ying-Jie
Food and Machinery
Here, tobacco extract was produced by fermentation using Enterobacter, then the tobacco extract was prepared by concentration. Continuous flow was applied to analyze the chemical composition of tobacco extract; and the aroma components were also analyzed by GC-MS. The as-prepared tobacco extract was applied in the cigarettes, and its effects on sensory and smoke aroma components were also evaluated. Results showed that, after fermentation, the content of protein, starch, galacturonic acid, total plant alkali and amino acid were decreased by 28.95%, 19.44%, 18.91%, 3.71% and 37.45%, respectively. The tobacco extracts prepared by fermentation had a typical sweet flavor, and the …
Thermal Pyrolysis Characteristics And Kinetics Study Of Reconstituted Tobacco With Different Coating Rates, Zhang Guo, Yue Xian-Ling, Ye Jian-Bin, He Yuan, Zhang Jun-Song, Liang Miao
Thermal Pyrolysis Characteristics And Kinetics Study Of Reconstituted Tobacco With Different Coating Rates, Zhang Guo, Yue Xian-Ling, Ye Jian-Bin, He Yuan, Zhang Jun-Song, Liang Miao
Food and Machinery
In order to investigate the pyrolysis characteristics of reconstituted tobacco with different coating rates, thermogravimetry technique combined with Coats-Redfern method was adopted to study the pyrolysis behavior and the variation of kinetic parameters of main weight loss stages. Furthermore, the pyrolysis gas release behavior was monitored by TG-FTIR technique. The results showed that: ① The content of C increased gradually and the content of O decreased with the increase of coating rate of reconstituted tobacco. While the change in the microstructure of reconstituted tobacco was not obvious. ② The thermogravimetric process of reconstituted tobacco can be divided into five stages: …
A Portable And Rapid Gutter Oil Detector Based On Multi-Feature Neural Network, Zhang Zhi-Peng, Huang Shi-Zhen, Lin Meng-Ru, Lu Qing-Ru, Lin Yan, Chen Rui-Qi
A Portable And Rapid Gutter Oil Detector Based On Multi-Feature Neural Network, Zhang Zhi-Peng, Huang Shi-Zhen, Lin Meng-Ru, Lu Qing-Ru, Lin Yan, Chen Rui-Qi
Food and Machinery
An offline oil detection device is designed based on the heterogeneous architecture of a System on a Programmable Chip (SoPC). The SoPC platform is constructed by porting Cortex-M0 soft core to Field Programmable Gate Array (FPGA). Using FPGA hardware resources, the operation order is optimized through the pipeline design with serial-parallel hybrid methods. Moreover, the parameter calibration accelerator and neural network accelerator are designed and connected to the bus system. Experimental results show that this device can perform the qualitative analysis and classification of gutter oil accurately with high detection efficiency. Compared with the traditional similar terminal gutter oil detection …
Analysis Of Stable Carbon Isotope Characteristics Of Formaldehyde In Food And Its Application In Source Analysis Of Formaldehyde, Han Li, Yu Ting-Ting, Liu Di, Yang Qing, Gao Fang, Wang Hui-Xia
Analysis Of Stable Carbon Isotope Characteristics Of Formaldehyde In Food And Its Application In Source Analysis Of Formaldehyde, Han Li, Yu Ting-Ting, Liu Di, Yang Qing, Gao Fang, Wang Hui-Xia
Food and Machinery
Based on the method of Gas Chromatography-Combustion-Isotope Ratio mass Sprectrometry (GC/C/IRMS), the contents of formaldehyde and the δ 13C value in aquatic products, dried edible fungi, fruits and vegetables were tested and analyzed. The results showed that the mass fraction of formaldehyde in the squid samples was 0.341~24.185 mg/kg, and the δ 13C value was -48.167‰~-24.514‰; the mass fraction of dragon fish samples was 54.555~121.416 mg/kg, and the δ 13C value was -45.430‰~-27.468‰. In the dried edible fungi, formaldehyde was detected only in dried Lentinus edodes of 212.741 mg/kg, and the δ 13C value were ranging …
Uncertainty Evaluation For Determination Of Amantadine In Egg By Isotope Dilution-Uplc-Ms/Ms, Ma Kai, Bao Na, Huang Yong-Qiao, Wu Xin-Wen
Uncertainty Evaluation For Determination Of Amantadine In Egg By Isotope Dilution-Uplc-Ms/Ms, Ma Kai, Bao Na, Huang Yong-Qiao, Wu Xin-Wen
Food and Machinery
A method for the evaluation of the uncertainty of amantadine in egg by ultra-performance liquid chromatography-stable isotope dilution mass spectrometry was established. Based on SN/T 4253—2015, the mathematical models of uncertainty was established and the sources of uncertainty were analyzed and evaluated, while the components of uncertainty were composed. The results showed that the expanded uncertainty was 4.9 μg/kg （k=2, 99% confidence interval） when the content of amantadine was 25.2 μg/kg, mainly caused by standard solution preparation and curve fitting.
Evaluation Of Uncertainty In The Determination Of Ethyl Carbamate In Chinese Spirits By Isotope Dilution Gc-Ms Method, Wang Kai-Yu, Zuo Hui-Jun, Yu Xin-Xin, Du Yun, Ma Yan-Ling, Wu Shuai
Evaluation Of Uncertainty In The Determination Of Ethyl Carbamate In Chinese Spirits By Isotope Dilution Gc-Ms Method, Wang Kai-Yu, Zuo Hui-Jun, Yu Xin-Xin, Du Yun, Ma Yan-Ling, Wu Shuai
Food and Machinery
According to GB 5009.223—2014 "National Standard for Food Safety, Determination of Ethyl Carbamate in Foods", the ethyl carbamate in liquor was determined, and the uncertainty of the measuring result was evaluated according to JJF 1059.1—2012 "Measurement Uncertainty Evaluation and Expression". Analysis found that the uncertainty of the measurement results was independent of not only the internal standard concentration of the isotope or the volumetric volume of the standard solution series, but also the volume of the sample after processing. Moreover, the uncertainty component introduced by the internal standard solution only related to the volume of the internal standard liquid. The …
Uncertainty Evaluation Of The Determination Of Vitamin C In Fruits And Vegetables By High Performance Liquid Chromatography, Wang Xia, Zhang Wei-Yi, Han Yi-Yi, Chen Mei-Lian, Feng Dong-Sheng
Uncertainty Evaluation Of The Determination Of Vitamin C In Fruits And Vegetables By High Performance Liquid Chromatography, Wang Xia, Zhang Wei-Yi, Han Yi-Yi, Chen Mei-Lian, Feng Dong-Sheng
Food and Machinery
To evaluate the uncertainty of the determination of vitamin C in fruits and vegetables by high performance liquid chromatography, a mathematical model was established to evaluate each uncertainty component, and the standard uncertainty and extended uncertainty of the synthesis were calculated. The results showed that the amounts of vitamin C in samples was 33.7 mg/100 g, and the expanded uncertainty was 1.4 mg/100 g (k=2). The uncertainties of the determination mainly come from the preparation of standard solution and the repeatability of determination.