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Articles 4711 - 4740 of 5782

Full-Text Articles in Food Processing

Hybrid Neural Network Based On Software Measurement For Dm423 Biomass During Batch Cultivation, Zeng Xiangyan, Zhao Liangzhong, Li Bing, Li Lin May 2016

Hybrid Neural Network Based On Software Measurement For Dm423 Biomass During Batch Cultivation, Zeng Xiangyan, Zhao Liangzhong, Li Bing, Li Lin

Food and Machinery

The biomass concentration estimated by the static feedforward multiplayer neural network of 5-5-1 topology and hybrid neural network - microbe growth model with five inputs of culture time, temperature, pH and dissolved oxygen and glucose concentration. The result showed that the static feedforward multiplayer neural network mean squared error (MSE) of testing samples 1.73×10-3. And hybrid neural network - microbe growth model offered a much better generalization accuracy than that of single neural network model, with MSE of testing samples of 0.25×10-3, it was found that there was some deviation between estimated biomass and actual values …

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Study On Functional Properties Of Camelina Sativa Gum, Li Zezhen, Chen Min May 2016

Study On Functional Properties Of Camelina Sativa Gum, Li Zezhen, Chen Min

Food and Machinery

The viscosity, foaming properties, emulsifying capabilitiy and synergetic action of Camelina sativa gum were studied by comparison to other gums. The results showed Camelina sativa gum solution in low concentration exhibited high apparent viscosity and good emulsifying and foaming properties. The viscosity of the compound gum increased sharply and the optimum ratio was 5∶5 of Camelina sativa gum to xanthan gum, and 9∶1 of Camelina sativa gum to guar gum. Camelina sativa gum improved the shear resistance and it could be well co-opperated with other gums. Meanwhile, the additive Camelina sativa gum had good properties.

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Apreliminary Inquiry Into Causes Of Dark Spots In Egg Shell, Zhang Mingrong, Ye Jinsong, Li Xinyang, Zhang Zili, Han Jingjing, Wang Yuhan May 2016

Apreliminary Inquiry Into Causes Of Dark Spots In Egg Shell, Zhang Mingrong, Ye Jinsong, Li Xinyang, Zhang Zili, Han Jingjing, Wang Yuhan

Food and Machinery

In order to preliminarily explore the causes of eggshell dark spots, the thickness, hardness, moisture and protein content of calcareous hard eggshell, and the thickness and protein content of shell membrane were measured in the normal eggshell and dark spots portion as well as no spots portion of dark spots eggshell, and the ultra structure was also studied results: The hardness of calcareous hard eggshell of dark spots eggshell was minimum, and its water content was maximum, which were highly significant (P<0.01) compared with other groups; However, there with no difference between spots group and the normal group. The thickness of calcareous hard shell was similar among the three groups, while that of shell membrane was highly significant (P < 0.05). In addition, protein content of calcareous hard shell of three groups had no significant difference (P > 0.05), while that of shell membrane of dark spots egg was much lower than the normal egg (P < 0.01). The result of scanning electron microscope showed that both the calcareous hard shell and shell membrane of dark spots group had more significant loose texture and porosity features than other groups. In conclusion, the formation of dark spots was mainly due to that the shell membrane under eggshell dark spots was thin with large mesh, resulting in moisture of the egg permeated through the shell membrane into the calcareous hard shell easily, and then the moisture was absorbed by calcareous hard shell, resulting in the formation of dark spots gradually.

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Optimization Of Heat Process Parameters And Mass Transfer Characteristic Of Alkaloids From Areca, Gong Yinyin, Yang Dawei, Gao Xiaoting May 2016

Optimization Of Heat Process Parameters And Mass Transfer Characteristic Of Alkaloids From Areca, Gong Yinyin, Yang Dawei, Gao Xiaoting

Food and Machinery

In order to reduce loss of alkaloids to improve chewing quality during the heat treatment process of areca, the dried areca were used as test materials to investigate the effect of factors about boiling wash and drying after wash as well as drying after flavoring on mass transfer of alkaloids in the shell of betel nut. Based on the mass transfer characteristics of alkaloids, the optimum parameters of heat treatment process were designed. The results showed that alkaloids from nuclear of areca will be dissolved out and transfer in the shell, then diffusing from the shell to the surface, the …

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Optimization On Hplc Detection And Pre-Treatment Conditions Of Patulin In Fresh Apple, Sun Lihua, Qian Huiping, Li Zhiwen, Chen Jiluan, Pang Xuequn, Yan Shijie May 2016

Optimization On Hplc Detection And Pre-Treatment Conditions Of Patulin In Fresh Apple, Sun Lihua, Qian Huiping, Li Zhiwen, Chen Jiluan, Pang Xuequn, Yan Shijie

Food and Machinery

A rapid and sensitive method was established for the accurate determination of patulin in fresh apples. Experimental parameters including extraction methods, mobile phase composition and flow rate for HPLC which always affect the sensitivity and analysis efficiency of the method were optimized systemically. The results indicated that solid phase extraction (SPE) techniques using functionalized polystyrene-divinylbenzene column (PEP) exhibited satisfactory recoveries comparing with other extraction methods. Under the optimized chromatographic conditions, patulin could be well separated from other impurities within 4 min, and detected with a wide linear range between 10-25 000 μg/L and a detection limit of 10 μg/L (S/N=3) …

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Study On Enhancing Antibacteial Activity Of Lactobacillus Plantarum Fmb10 Through Composite Mutagenesis, Chen Yunyun, Lu Zhaoxin, Dang Lijuan, Gao Yuqi May 2016

Study On Enhancing Antibacteial Activity Of Lactobacillus Plantarum Fmb10 Through Composite Mutagenesis, Chen Yunyun, Lu Zhaoxin, Dang Lijuan, Gao Yuqi

Food and Machinery

Induced mutation of Lactobacillus plantarum fmb10 divided from pineapple was performed by Co60γ, low-energy N+ beam irradiation, DES, EMS and composite mutagenesis, respectively, to enhance the antibacterial activity. The results showed that Lactobacillus plantarum fmb10 was sensitive to low-energy N+ beam and EMS irradiation, and a high-activity strain fmb10-Z with stable inheritance and forward mutation was obtained after the treatment of EMS-low-energy N+ beam composite mutagenesis. The bacteriostatic diameter against E.coli was increased by 23%, and the antibacterial activity of the mutant fmb10-Z was increased 1.5 times compared with original strain.

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Determination Of Cd In Shrimps By Microwave Digestion And Inductively Coupled Plasma Mass Spectrometry, Li Qianyun, Zhou Guoyan, Cao Lei May 2016

Determination Of Cd In Shrimps By Microwave Digestion And Inductively Coupled Plasma Mass Spectrometry, Li Qianyun, Zhou Guoyan, Cao Lei

Food and Machinery

The orthogonal array design methods were applied to analyze the influence of H2O2 volume/HNO3 volume/microwave digestion time three factors and their interaction on the extraction of Cd，select an optimized progress to extract Cd from shrimps. The experimental results showed that when H2O2 volume was 1.0 mL, HNO3 volume is 5.0 mL, microwave digestion time was 13 minutes and 46 seconds, under these conditions，the contents of Cd reached 0.497 mg/kg. Determination of GBW10050 (big shrimps) showed that contents of Cd have the same results with standards values. Method limits of detection were obtained …

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Nondestructive Detection Of Internal Quality Of Loquat By Near Infrared Spectroscopy, Wang Xi, Wu Xiyu, Pang Lan, Xu Dan May 2016

Nondestructive Detection Of Internal Quality Of Loquat By Near Infrared Spectroscopy, Wang Xi, Wu Xiyu, Pang Lan, Xu Dan

Food and Machinery

Spectra data of the 101 loquat samples were obtained by using NIRS and the TSS, titratable acid, Vc of the samples were determined by conventional chemical methods. The mathematical pretreatment methods were used as spectral preprocessing options, and then the calibration models of TSS, titratable acid and Vc were established respectively by PLS. By using these models, the TSS, titratable acid and Vc in the validation sets can be predicted. The Rp2 are 0.906, 0.745, 0.554, RMSEP are 0.628, 0.048, 2.23 respectively, and the RPD of TSS is 3.31. Thus, the calibration model of TSS can be used for the …

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Effect And Application Of On-Line Payment Consumption Way On Food Safety Traceability At Tourist Area, Liu Wenbin May 2016

Effect And Application Of On-Line Payment Consumption Way On Food Safety Traceability At Tourist Area, Liu Wenbin

Food and Machinery

The mode of on-line payment consumption has already entered the public life, bringing a lot of convenience for us. The process of payment usually carries vital deal information, and online payment is easily to get and convert this information. Food safety traceability of tourist areas can make full use of the characteristics of online consumer payment, from which we can overcome the problems of safety information flow is easily broken and difficult to carry caused by cash transactions. Based on the convergence of online payment, tourism food safety and feedback information, we should complete food supervisory platform, use big data …

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Functions And Route Of Food Safety In The Financial Performance Of Enterprises, Wang Laigen May 2016

Functions And Route Of Food Safety In The Financial Performance Of Enterprises, Wang Laigen

Food and Machinery

Food enterprises have the ability to guarantee food safety, will inevitably lead to the interests of the stakeholders to make a choice of behavior, which can affect the interests of enterprises, and ultimately reflect the financial performance of enterprises. By examining the function of food safety in the financial performance of enterprises, it can be found that the food safety affects the attitude of the consumers, the government and the public opinion, so that food companies can improve the financial performance. Therefore, financial performance has the function of promoting food enterprises to fulfill their food safety guarantee responsibilities. However, due …

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Design Of A New-Type Continuous Stack-Up Juice Press And Proof On Experimental Machine, Ma Songbai, Zhang Shaoying, Wang Jing May 2016

Design Of A New-Type Continuous Stack-Up Juice Press And Proof On Experimental Machine, Ma Songbai, Zhang Shaoying, Wang Jing

Food and Machinery

Based on the analysis on demands of fruit-vegetable juice processing, and advantages and disadvantages of some typical industrial press machines, the technical solution of a new-type continuous stack-up juice press was presented. The mechanical structure and working principle of the juice press were illustrated in details. Besides that, based on the basic filter-press unit, an experimental machine was created to proof this technological solution. And then experiments with pressing Ralls apples juice were done in the experimental machine. The experimental results show that when the driving motor rotates around 600 r/min, the juice yield rate is 81.16%, and the average …

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Research On Self-Navigation System Of Material Grabbing Robot Based On The Inverse Kinematics Analysis, Li Feng, Zhang Xuesong, Yue Yun, Zhang Zhongmei May 2016

Research On Self-Navigation System Of Material Grabbing Robot Based On The Inverse Kinematics Analysis, Li Feng, Zhang Xuesong, Yue Yun, Zhang Zhongmei

Food and Machinery

In order to achieve robot self-navigation, based on the inverse kinematics solution of D-H method, the navigation analysis of food material grabbing robot is carried out and the robot navigation positioning solutions were obtained. Through the combination of hardware and software of the robot, the automatic navigation control principle of the robot is described in the form of STL statement, realizing the robot positioning calculation. The efficiency and stability of robot navigation system are verified by practical production, which proves that it was well suited to food material grabbing production line.

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Study On Elastic And Plastic Strain Strength For Housing Of Flour Pressure Spray Dryer, Wang Zhencheng, Liu Airong, Wei Jinying, Zhao Yongjie May 2016

Study On Elastic And Plastic Strain Strength For Housing Of Flour Pressure Spray Dryer, Wang Zhencheng, Liu Airong, Wei Jinying, Zhao Yongjie

Food and Machinery

The axisymmetric thin walled housing model for the thin-walled housing of YPG-22500 flour pressure spray dryer was established, and the typical equation of energy method based on the thin-walled housing theory under the elastic-plastic deformation was listed, and the calculation method and condition on strain strength and deformation stiffness were also given. According to the assuming boundary condition on both ends of the housing and to the working environment of cycle fatigue and to the actual situation of materials line hardening, integrated the typical equation successively by the computer to obtain the numerical approximate solution matched the requirement and the …

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Discrete Element Simulation And Experiment Research Of Material Flow In Rubber Roller Husker Vibrating Feeder, Jia Lele, Ruan Jinglan May 2016

Discrete Element Simulation And Experiment Research Of Material Flow In Rubber Roller Husker Vibrating Feeder, Jia Lele, Ruan Jinglan

Food and Machinery

The models of Rubber Roller Husker Vibrating Feeder and rice particle are obtained through the discrete element analysis software EDEM. Simulate the movement of material flow in the vibrating feeder by setting up the corresponding parameters. The average speed of single particle is 0.22 m/s roughly under the theoretical parameters, and the average velocity of material flow is around 0.24 m/s. The trajectory is achieved and the feeding uniformity is discussed. In order to verify the feasibility of the simulation results, adopt vibration meter GM63B to measure the actual velocity of material flow under the different amplitude in the experimental …

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Experimental Study On Washing Machine Combined Brush-Roller And High-Pressure Gas Spraying For The Bay Scallop, Yang Shuhua, Teng Guijun, Li Na, Yi Jinggang, Wang Jie May 2016

Experimental Study On Washing Machine Combined Brush-Roller And High-Pressure Gas Spraying For The Bay Scallop, Yang Shuhua, Teng Guijun, Li Na, Yi Jinggang, Wang Jie

Food and Machinery

Facing with the problem that manual cleaning for bay scallop is Labor-intensive, low efficiency，poor health conditions and the demands of industrialization and mechanization production. A kind of double-brush-roller and high-pressure gas spraying combined washing machine was designed, which was efficient and energy saving. It solved the problem that the survival rate of scallops cleaned by high-pressure water. It has been determined that on the premise of scallops cleaning effect and the efficiency, the highest cleaning degree of removing impurity could reach 3.848% and the survival rate could reach 98% under the parameter combination, that the roll core distance of the …

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Optimization Design Of Heat Exchanger For Plate Type Heat Exchanger, Zhang Yu, Xie Jiefei May 2016

Optimization Design Of Heat Exchanger For Plate Type Heat Exchanger, Zhang Yu, Xie Jiefei

Food and Machinery

Based on the previous research of small batch of grain drying process, exchange the batch type recirculating grain dryer tube for heat exchanger with plate heat exchanger, with easier access to 100 DEG C high temperature steam instead of 800 DEG C flue gas, at the same time, plate heat exchanger can also adopt a more efficient material. Finally, using the matlab optimization toolbox for plate heat exchanger model optimization, under the guarantee for thermal efficiency unchanged, the size of the heat exchanger was optimized. Research has shown that after improvement is higher than before the heat exchanger in heat …

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Design And Structure Optimization Of The Multi-Spots Starter-Pressing Machine Of Daqu In Chinese Spirits, Xie Liangliang, Tian Jianping, Yang Haili, Zhang Liangdong, Meng Sidong May 2016

Design And Structure Optimization Of The Multi-Spots Starter-Pressing Machine Of Daqu In Chinese Spirits, Xie Liangliang, Tian Jianping, Yang Haili, Zhang Liangdong, Meng Sidong

Food and Machinery

Considering the paste and wine can not meet the effect of the artificial bending due to the single structure and poor controllability of the existing Daqu liquor knee-piece bending press machine，which result in the discordance of the Daqu overall tightness. A new multiple-points flexible controlled bending press machine was designed. A multitude of hammers in different combinations repeatedly and multiple-points with flexibility crowed and sheared the block, which simulated the artificial start-pressing and block-making, so that better effect of the block with moderateness and uniformity could be achieved. The key component of which supporting plate structure was optimized and analyzed …

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Empty Bottle Inspection Method To Realize Image Acquisition Technology Based On Computer Vision, He Xiaohu May 2016

Empty Bottle Inspection Method To Realize Image Acquisition Technology Based On Computer Vision, He Xiaohu

Food and Machinery

According to the shortcomings of traditional detection system of slow speed and low efficiency, demonstrated the feasibility based on the computer vision of empty beer bottle detection image acquisition technology, and discussed the methods of image acquisition technology to achieve, discussed the basic technical route of system, established the system framework, and analyzed the main problems need to be solved in the research. To overcome the disadvantages of manual detection and improve the efficiency of empty bottle detection, it plays a great role.

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Method And Realization For Flexible Production Level Improvement Of Tobacco Production Line, Su Fubin May 2016

Method And Realization For Flexible Production Level Improvement Of Tobacco Production Line, Su Fubin

Food and Machinery

In order to solve the problem of low efficiency of the whole production line and cannot fully meet the demand for flexible production in the process of tobacco processing, a new type of multi head and flexible multi-function tobacco feeding optimization and reconstruction scheme was put forward. The application results show that the production is more flexible and the storage tank quantity is reduced by 20%, which meet the flexible production goal, and save the investment cost of equipment RMB 383,400 yuan.

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Improvement Of Pressing Device In Ch Wrapper, Deng Yongxiang, Li Gaojun May 2016

Improvement Of Pressing Device In Ch Wrapper, Deng Yongxiang, Li Gaojun

Food and Machinery

The cigarette packet under the pressing device of the CH wrapper is easy to be friction scratch by conveying belt, when the equipment is stopped. In order to solve this problems, the pressing device was improved as following： ①between the hinge and support are connected by threads into elastic connection; ② when the CH wrapper is stopped, the pressing device is a cylinder lifting left the cigarette packets without pressure of the cigarette package. The results of application showed that the new device can guarantee the normal operation of equipment, and effectively solves the cigarette packets and conveyor belt friction …

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Improved Design Of Servomechanism Drive System In Flavoring Feeding, Wu Wenqiang, Yi Hao, Liu Bin, Liu Yong, Zhang Hui, Zhang Xuewu, Xu Junmin May 2016

Improved Design Of Servomechanism Drive System In Flavoring Feeding, Wu Wenqiang, Yi Hao, Liu Bin, Liu Yong, Zhang Hui, Zhang Xuewu, Xu Junmin

Food and Machinery

According to the low flavoring accuracy in the traditional frequency conversion feeding pump drive system,the the feed pump drive system was improved, the servo motor system was used to drive the liquid feeding, and the control program is optimized. After the modification of the system, the cumulative added essence increased from 0.09% to 0.15%, to ensure the uniformity of spiced charging, improve the product quality, reduce the production cost.

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Determination On Freshness Of Strawberry Based On Electronic Nose And Ethanol Sensor, Xu Jing, Zhao Xiujie, Sun Ke, Wang Zhuo, Tu Kang May 2016

Determination On Freshness Of Strawberry Based On Electronic Nose And Ethanol Sensor, Xu Jing, Zhao Xiujie, Sun Ke, Wang Zhuo, Tu Kang

Food and Machinery

“Hongyan” strawberry was selected as test materials, with the storage temperature of 4 ℃, humidity of 85%~95%, to detect the strawberry freshness based on flavor. Electronic nose (e-nose) and the single ethanol sensor were used to collect the odor of strawberry during storage period. The strawberry was divided into four stages based on the changes of sensory evaluation score and Principal component analysis. By using the partial least squares discriminant analysis (PLS-DA) and classification support vector machine(SVM-C), the model of fresh degree of strawberry was established based on odor discrimination. The overall accuracy for modeling group and validation group were …

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Effect On Preservation Of Sugarcane Juice With Chitosan And Lemon Juice, Shen Wangqing May 2016

Effect On Preservation Of Sugarcane Juice With Chitosan And Lemon Juice, Shen Wangqing

Food and Machinery

To study the effect on preservation of sugarcane juice with chitosan and lemon juice, the mass fraction of chitosan, sterilization temperature, sterilization time and dosage of lemon juice were studied by the single factor, then L9(34) was designed. The preservation effect were determined by the change of physicochemical characteristics (pH, Vc content, sugar content, acidity and soluble solids) and sensory evaluation of the sugarcane juice, meanwhile the samples were characterized by ultraviolet spectrum. The result showed that the best combination were the mass fraction of chitosan of 1%, the sterilization temperature of 90 ℃, the sterilization …

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Analysis Of Shelf Life Of Different Flavor Barbecue Salt, Yue Yuanyuan, Tian Yan May 2016

Analysis Of Shelf Life Of Different Flavor Barbecue Salt, Yue Yuanyuan, Tian Yan

Food and Machinery

Using accelerated shelf life test method, by improving the different barbecue flavor salt storage temperature and speed up its quality changes, moisture content, total number of colonies, coliform group in different barbecue flavor salt was determined to predict its shelf life through the analysis shelf life model. Results show that the different spices and amount is the main reason that influence the shelf life length, among them, the shelf life of spicy barbecue flavor salt is the longest (298 d), followed is hemp and spicy flavor of barbecue salt (284 d), cumin flavor of barbecue salt and garlic flavor barbecue …

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Preservative Effect Of Active Films Containing Pomegranate Peel Extract As Antimicrobial Agent On Chilled Pork, Hu Shuaifeng, Xie Qingchao, Liang Xianbo, Li Li May 2016

Preservative Effect Of Active Films Containing Pomegranate Peel Extract As Antimicrobial Agent On Chilled Pork, Hu Shuaifeng, Xie Qingchao, Liang Xianbo, Li Li

Food and Machinery

With 1.5% of pomegranate peel extract (PPE) as antimicrobial agent, polyethylene resin (PE) and polypropylene resin (PP) as base material, PE, PPE—PE, PP/PPE—PE active films were prepared and their basic properties were investigated. Pork stored at refrigeration (4±1) ℃ with PE, PPE—PE, PP/PPE—PE active packaging films, and the effects of preservation were evaluated by total viable count (TVC), total volatile basic nitrogen (TVB-N), pH value, thiobarbituric acid (TBA) value, drip loss and sensory scores. PPE—PE film was 1.96 times the oxygen transmission rate of PE film, 4 times of PP/PPE—PE film. PPE caused the light transmittance of PE film decreased, …

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Effect Of Different Packaging Conditions On Storage Quality Of Akesu Walnut, Wang Ping, Song Lijun, Lu Jiankang, Hou Xujie May 2016

Effect Of Different Packaging Conditions On Storage Quality Of Akesu Walnut, Wang Ping, Song Lijun, Lu Jiankang, Hou Xujie

Food and Machinery

In order to find the best way of physical preservation and storage conditions of xin 2 in Akesu, using aluminum foil packaging, Inflatable packaging, vacuum packaging to wrap the walnuts were stored in low temperature (4 ℃) and room temperature (25 ℃), and controlled trial. Determining the acid value, koettstorfer numbe, iodine number, glucosinolates barbituric acid value, the peroxide value, the activity of lipase, peroxidase, catalase activity of oil from walnut, which change made as oxidation quality evaluation index, to study the difference of the changes of the indexes of different storage conditions using variance analysis. The results showed that: …

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Effects Of Ethanol Vapor Treatments On Related-Senescence Physiological Indexes Of Postharvest Snap Bean During Storage, Guo Yu, Jiang Yufu, Zhong Jia, Wang Dongxue, Wang Qiang, Jin Yazhong, Wang Ying May 2016

Effects Of Ethanol Vapor Treatments On Related-Senescence Physiological Indexes Of Postharvest Snap Bean During Storage, Guo Yu, Jiang Yufu, Zhong Jia, Wang Dongxue, Wang Qiang, Jin Yazhong, Wang Ying

Food and Machinery

To investigate the physiological mechanism of exogenous ethanol vapor regulation of senescence of postharvest snap bean, the effects of related-senescence physiological indexes of postharvest snap bean applied ethanol (1.5 mL/kg and 3 mL/kg) vapor was studied with a snap bean (Phaseolus vulgaris L. var.chinensisHort.) cultivar WuChang snap bean, with the treatment of clear water vapor as control, and treated materials were stored at room temperature (23 ℃±1 ℃). The results showed that exogenous ethanol vapor significantly reduced the activity of LOX and PPO in snap bean during the storage, and postponed the increase of MDA content. Furthermore, ethanol vapor delayed …

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Study On Composition And Antioxidant Activity Of Amino Acids In Pickled Tofu Oligopeptides, Tang Jie May 2016

Study On Composition And Antioxidant Activity Of Amino Acids In Pickled Tofu Oligopeptides, Tang Jie

Food and Machinery

By water soluble preparation of oligo peptide of fermented bean curd, physico-chemical analysis and amino acid composition analysis, through and ascorbic acid comparison ·OH, DPPH·, O-2· free radical scavenging capacity, evaluation of fermented bean curd oligopeptides antioxidant activity of the oligopeptides. The results showed that the total protein content of fermented bean curd oligopeptides 85.47%. The amino acid composition of the rich, rich in antioxidant amino acids must amino acid content of 34.43%, with the total amino acid content of antioxidant activity was 30.5%; antioxidation experiment results show, fermented bean curd oligopeptides with free radical scavenging capacity and …

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Response Surface Methodology For Optimization Of Extracting Polysaccharide From Polygala Tenuifolia Willd. And Antioxidant Evaluation, Jing Yongshuai, Wu Lanfang, Wang Qian, Zheng Yuguang, Yan Yuping, Jiang Aimin May 2016

Response Surface Methodology For Optimization Of Extracting Polysaccharide From Polygala Tenuifolia Willd. And Antioxidant Evaluation, Jing Yongshuai, Wu Lanfang, Wang Qian, Zheng Yuguang, Yan Yuping, Jiang Aimin

Food and Machinery

The optimum condition of ultrasonic extraction of Polygala tenuifolia Willd. Polysaccharide (PTP) was investigated. The results showed, the optimum condition was ultrasonic extraction time 30 min, ultrasonic extraction, temperature 67 ℃, ratio of water to raw material 10∶1（mL/g）, and extraction 2 times, the yield of polysaccharide was（5.87±0.21）% (n=3). IR spectra predicted PTP had typical characteristic absorption peaks which were neutral polysaccharide and free from urinic acid. In vitro antioxidant activities showed PTP had effects on DPPH radical and hydroxyl radical.The IC50 of it against DPPH radical and hydroxyl radical was 0.83 mg/mL, 1.29 mg/mL.

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Separation Of Β-Sesquiphellandrene By Silica Gel And Argentation Column Chromatography, Wang Yan, Zhou Changyuan, Du Ailing May 2016

Separation Of Β-Sesquiphellandrene By Silica Gel And Argentation Column Chromatography, Wang Yan, Zhou Changyuan, Du Ailing

Food and Machinery

A aether and n-hexane solution was used as mobile phase to preliminary extract β-sesquiphellandrene from ginger oleoresin by common silica gel column chromatography, and GC—MS was used for detecting β-sesquiphellandrene tracing. Comparison of different developing solvents of β-sesquiphellandrene and zingiberene on argentated silica gel G pre-coated plate, hexane-ethyl acetate (99∶1)was used as the mobile phase to sepatate β-sesquiphellandrene, the results indicated that the GC—MS area percentage of the silica gel and argentation column chromatography product was 95.79% with 89.73% recovery. Through the HPLC detection of β-sesquiphellandrene peak sample, β-sesquiphellandrene was found its existence of UV absorption at 232 nm, and …

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