Food Processing Commons^™

Influence Of Different Pressure On Heat Transfer Of Nozzle With Different Sizes, Gu Hanwen, Xie Jing, Wang Jinfeng

Food and Machinery

Food industry is demanding higher and higher quality of frozen food, and the quickfreezer can well meet this requirement. In this study, the internal flow field of quick freezer with slit nozzle type was taken as the research object.Three different sizes of nozzle structures based on inlet pressure of 190 Pa, 170 Pa and 160 Pa, numerical simulation and field test of computational fluid dynamics (CFD) were used to compare the differences of internal flow field and heat transfer characteristics of three nozzle structures under different pressure conditions. The results showed that the outlet wind velocity, Nusselt number and uniformity …

Study On The Performance Of Constant Temperature Drying Mode Of Multifunctional Heat Pump Drying Device, Mu Huan, Tang Lan, Sun Yanhong

Food and Machinery

In order to promote the application of heat pump drying technology, a multifunctional heat pump drying device with heating was designed. The conventional drying, constant temperature drying, and various operating modes were refrigerated, and the corresponding experimental bench was set up to test the performance of the constant temperature drying mode. The air supply temperature of the heat pump drying device and the bypass rate of the drying medium were adjusted by the control system, and the drying experiment was carried out under different operating conditions to test the effects on the wet cotton cloth. The results showed that the …

Design Of The On-Line Continuous Cutting Equipment Foryoung Coconut, Zhang Cong

Food and Machinery

The young coconut cutting technology was studied and the new automatic processing equipment was designed. The equipment could transport young coconuts with fixed spacing. In the process of operation, realized the synchronous cutting of the cylindrical surface and the conical top of the fruit and the cutting and separating of the ends. Finally the product was formed. The design scheme, key structural and technical principle of this device was also detailed. In the experiment, the young coconut with transverse diameter of φ150~160 mm was used as the processing object, and the products with cylindrical diameter of 130 mm and height …

Optimum Design And Analysis Of Yuba Cutting Tool, Du Changqiang, Xu Liangyuan

Food and Machinery

The Solidworks software is used to analyze the statics and modal of the circular cutter and the straight blade knife. In the same test condition, the mass and volume wear tests of circular and straight-edged cutting tools were carried out, and the data of stress, strain, displacement and wear about the two kinds of shape cutting tools in the operation were obtained. Through comprehensive analysis, it is found that the straight blade flat cutter has less wear and better stability, and is more suitable for continuous mechanized cutting. The straight blade flat cutter is preferably selected as the main cutting …

Germicidal Effects Of Ultraviolet On Condensed Milk Barrel And Its Dynamic, Zhang Weiwei, Sun Yanhui, Wei Haiyang, Jia Xiaoli, Liu Shulan, Gu Haiyang

Food and Machinery

An innovation UV irradiation device was used to detect the germicidal efficacy of UV irradiation on microorganisms inside the condensed milk barrel. In terms of germicidal rates, experiments were conducted to investigate the disinfecting feasibility and the effectiveness of ultraviolet under 60 experimental conditions, which were formed by 4×5×3 factorial combinations of radiant intensity, radiant time and radiant distance. The results indicated the germicidal rate was positively correlated with the radiant intensity, radiant time and radiant distance. Meanwhile, it was up to 99.9% for 90 second by UV irradiation in the same light with the radiant intensity above 90 μW/cm …

Analysis Of Packaging Design Elements Based On Eye Tracking Technology And Quantitation Theory, Zhang Yue, Hou Yadan, Li Hui

Food and Machinery

In order to design packaging that meets the consumer's perceptual needs, we use eye tracking technology and quantitation theory type I to study the key design factors that influence consumer emotions through eye movement indicators. The evaluation of kansei image of consumers is obtained through semantic difference method. The application of quantitation theory type I was used to establishes the relationship betweenkansei image and design elements and constructs mathematical models to auxiliary packaging design. The case study of tea packaging design shows that the method was accurate and feasible.

Effects Of Antioxidants On Properties And Lipid Oxidation Of Partially Frozen Storageloach, Lu Xiaochuan, Wang Xiaojun, Shang Yongbiao

Food and Machinery

The effects of different treatments including clove extract，phystic acid，rapeseed，BHT and V_E on properties and lipid oxidation of partially frozen storage（-2.5 ℃）loach were studied. The results showed that, with the prolongation of storage time, the sensory comprehensive score of different treatment groups decreased gradually; the pH value first descendedand rose; juice loss showed an increasing trend; the shear force value declined significantly (P<0.05); TVB-N values increased, and TVB-N values of all treatment groups were less than the maximum 20 mg/100 g at 24 d, in the acceptable range; the values of thiobarbituric acid and peroxide of the loach increased significantly (P<0.05); the saturated fatty acid (SFA) and monounsaturated fatty acid (MUFA) contents showed an increasing trend, and the relative content of polyunsaturated fatty acid (PUFA) decreased. The trend of all the above treatment groups was better than the control group. With the comprehensive analyses, the results showed that the shelf life of the control group was 8~12 days, and the antioxidant group could be 20~ 24 days, under the partially frozen condition. It was also found that the phytic acid, BHT and V_E showed stronger antioxidant capacity in the treated groups, with more effective inhibition of the oxidation of unsaturated fatty acids and better maintaining of the food quality and processing performance.

Preparation Of Kiwi Fruit Seed Oil Micro-Emulsion And Its Shelf Life Prediction, Cai Chengchen, Zhu Shiye, Xiong Wuguo, Li Jiaxing, Yi Qian, Wei Zilu

Food and Machinery

Taking kiwi fruit seed oil as raw material, the quasi three element phase diagram method was used to prepare the micro-emulsion and its stability was analyzed to predict its shelf life. For the purpose, the quasi-ternary phase diagram of kiwi fruit seed oil micro-emulsion in the presence of surfactant is 1,2-propylene glycol, preparation temperatures was 30 ℃ and different proportion of kiwi fruit seed oil to IPM, Tween 80 to Span 80 and Km value was constructed by calculating and comparing the size of the micro-emulsion area. Taking peroxide values(POV) as stability evaluation index, the antioxidant stability effects of kiwi …

Study On The Manufacture Of Potato Yogurt And Its Quality Chenge During Storage, Guo Jingjing, Li Bin

Food and Machinery

The potato yogurt was developed with milk powder and potato as raw materials. The effects on the fermentation process of yogurt were studied, including fermentation time, fermentation temperature and inoculation amount, and the optimum fermentation conditions were determined. The influence of stirring speed, stirring time and the amount of potato pulp addition on the mixing process was also studied, and the optimum technological conditions of agitation were determined. The moisture content, pH, acidity, water holding capacity, texture and rheology of potato yogurt during storage were determined, and the quality changes during storage were studied. Results: The optimal fermentation conditions were: …

Identification Group Of Fertilized Eggs And Infertile Eggs In Early Hatching Stage Based On Machine Vision, Wu Linfeng, Yu Huaixin, Zhu Zhihui

Food and Machinery

In the early stage of incubation, the infertile eggs still have certain edible value, and if removed earlier, they can not only reduce economic losses, but also avoid the impact on other normally hatched eggs. In order to solve the problem of online detection of group eggs information，this paper uses machine vision technology to detect the fertilization information of group chicken eggs based on industrial egg trays for the first time. The whole eggs were directly put into the detection device from the incubator to obtain the group egg images, which reduced unnecessary damage to the eggs and improves the …

Effect Of Salicylic Acid Treatment On Fresh-Keeping Of Baby Gingers, Fu Yunyun, Jiang Cheng, Yan Xiaoqian, Yuan Bo, Liu Xiaoping, Liu Lu, Li Jie, Chen Anjun

Food and Machinery

In order to study the effect of salicylic acid on preservation of postharvest baby gingers, different concentrations of salicylic acid (10, 15, 20 mmol/L), stored at (11±1) ℃, was used to investigated the effect on the quality of baby gingers. The results showed that the treatment of salicylic acid could delay the weight loss rate, color difference, hardness and brittleness of the gingers during the storage. Moreover, salicylic acid could inhibit the reduction of total phenolics, and flavonoids. In general, treatment of with 15 mmol/L salicylic acid worked best.

Comparison Of Functional Components And Antioxidant Activities In Jaboticaba Wine And Grape Wine, Qiu Shanlian, Zheng Kaibin, Lin Baomei, Zhang Shuhe

Food and Machinery

In order to understand the differences of functional components and antioxidant activities in dry red jaboticaba wine and dry red grape wines, total polyphenols, total flavonoids, resveratrol, tannins, phenolic acids, vitamins, anthocyanins and minerals contents in wine were determined, and the antioxidant activities were investigated by using the methods including DDPH, ABTS, phenanthroline and FRAP. Results showed that the varieties and contents of the functional components of dry red jaboticaba wine and two kinds of dry red grape wine (a French dry red wine and a domestic dry red wine) have their own characteristics and advantages. The contents of gallic …

Study On Antioxidant Capacity Of Selenium-Substance Form Cardamine, Du Chaodong, Zhu Song, Yu Tian, Cong Xin, Chen Shangwei

Food and Machinery

The 1,1-diphenyl-2-picrylhydrazyl free radical (DPPH·), hydroxyl free radical (OH·), 2, 2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) free radical (ABTS⁺·) and superoxide radical (O^-₂·) scavenging ability were selected as the four indicators to evaluate the in vitro antioxidant properties of different selenium-containing substances, and compared with selenium-enriched yeast (SY) and non-selenium-enriched peptides and inorganic selenium mixture (SPIS).The results showed that SPI had the strongest ability to scavenge four kinds of free radicals, and its DPPH·, OH·, ABTS⁺· and O^-₂· scavenging rates were 87.5%, 50.3%, 99.7% and 45.7%. The weakest sample was IS, and its radicals …

Optimization Of Low Temperature Pressing Technology And The Analysis Of Physicochemical Indexs Of Basil Seed Oil, Li Tian, Guo Qin, Duan Yuquan, Li Qingpeng, Sun Zhigao, Wang Qiang

Food and Machinery

On the basis of single factor experiment, response surface methodology was used to optimize the low-temperature pressing process of basil seed oil, and physicochemical indexes, including color, water content and volatile matter, acid value, peroxide value, oxidation induction time and fatty acid composition of basil seed oil, were detected. The results showed that the preheating temperature and the time of preheating and pressing had significant effects on the oil yield of Basil seeds under certain pressing pressure and temperature. The optimum preparation conditions of basil seed oil were pressing with pressure 41 MPa at 50 ℃ for 1.7 h, and …

Preparation Of Water-Soluble Resveratrol/Hp-Β-Cd Microcapsule By Spray Drying Method, Tang Hongwei, Kuang Chuntao, Xiang Shu, Li Xiangzhou, Yang Ting, Yi Xiangguang

Food and Machinery

Hydroxypropyl-β-cyclodextrin (HP-β-CD) was used to improve water solubility of Res. The preparation conditions of Res/HP-β-CD microcapsule by spray drying method were optimized, and Res/HP-β-CD microcapsule was confirmed by UV, IR and SEM. The results showed that optimum preparation conditions of Res/HP-β-CD microcapsule were mass ratio of Res to HP-β-CD for 1∶5, stirring at 30 ℃, feed flow rate for 2.1 mL/min and inlet-air temperature for 140 ℃. The rate of drug-loading and the solubility of Res were 15.18% and 12.75 g/L, respectively, under the optimum conditions. UV, IR and SEM tests of Res/HP-β-CD microcapsule demonstrated that the aqueous solubility of …

Study On The Stability Of Barley Grass Beverage, Chen Weifeng, Fan Liuping

Food and Machinery

The effects of stabilizer and homogenization technologies on the stability of barley seedling beverage were studied in this paper. The optimal formulation of compound stabilizers was determined by orthogonal test with TSI as the index. And the effects of homogenization times and pressure on stability index, particle size, Zeta potential and viscosity of barley grass beverage at fixed temperature were studied. The optimum formulation was as follows: konjac gum 0.11%, xanthan gum 0.04%, CMC 0.20%, gellan gum 0.06%, MCC 0.10%, homogenized once under 30 MPa at 65 ℃. Under this technological conditions, the TSI is 0.4, the viscosity is 37.22 …

Optimization On The Formula Of The Compound Vermicelli Frompurple Potato Starch By D-Optima Mixture Design, Zeng Xuedan, Zhang Can, Wang Zhangying, Jiang Guangyang, Shen Guanghui, Wu Hejun, Chen Anjun, Li Shanshan, Zhang Zhiqing

Food and Machinery

In order to optimize the quality of vermicelli of purple potato starch, the formula of five kinds of starch from purple potato, sweet potato, tapioca, potato and purple potato residue powder, were investigated with the D-optimal mixture design. The principal component analysis and dimensionless normalization method were used to comprehensively assess the quality of vermicelli from purple potato starch. During the mixture design experiment, the linear regression models were built based on the response values of the three synthesis scores of the texture characteristics (T₁), cooking characteristics (T₂) and sensory characteristics (T₃). The results …

Study On The Effect Of Compressed Synthetic Food On Human Exercise Ability, Peng Yiteng

Food and Machinery

Selected 12 persons with relatively similar physiological indexes, and analyzed the effects of compressed diets on the exercise capacity of ordinary diets and the 90 military dry foods by using self-control and cross-balanced experimental design methods. The persons were fed two groups of foods with different nutrients for exercise, training, recovery of blood glucose levels, blood lactate concentration, blood lactate clearance, heart rate changes, changes in related hormone levels, and different oxidation changes to evaluate the effect of synthetic foods on the body's ability to exercise. The experimental results show that compressed synthetic foods have obvious superiority in terms of …

Influence Of Two Sport Food On Human Body Movement Ability, Huang Guoyang

Food and Machinery

In this study, 30 male athletes were used to evaluate the effects of two different nutrient composition sports foods on human exercise performance, physical fitness recovery, and fatigue level through crosstrial and self-control experiments. The test results showed that: in the case of fasting blood glucose at the same level, the blood sugar concentration of sport food A was higher than sport food B after 20 minutes of consumption, while blood sugar concentration is higher than sport food B after 60% VO_2max exercise 50 minutes. After exhaustive training, the lactic acid scavenging efficiency of sport food A was significantly …

Research Progress Of Flavor Bacteria In Soy Sauce Fermentation, Xu Yantao, Zhou Kai, Jiang Xuewei, Liang Shengnan, Zhang Wei, Peng Dong, Zhou Shangting, Luo Xiaoming

Food and Machinery

The flavor materials of soy sauce are formed by the metabolism of microorganism. Reviewed the flavor bacteria, flavor substances of soy sauce and relative research method. Furthermore, the research direction and development of flavor bacteria in soy sauce has also been analyzed, which provided a strong assurance for the production of high quality soy sauce with safety, health and rich mellow flavor.

Progress Of Analytical Methods For Antibiotic Residues In Plant-Derived Food, Zhou Jie, An Jiao, Dong Chao, Zhao Jing, Zhang Yaohai, Jiao Bining

Food and Machinery

In order to assess the health risks of antibiotic exposure to humans, it is needed to establish the rapid screening and confirmation testing methods for antibiotic residues in plant samples. This paper briefly introduces the registration and limit standards of agricultural antibiotics in China, the origin and accumulation of antibiotics in plant-derived foods, especially the present pretreatment and detection techniques of antibiotic residues in plant-derived foods, and prospects the work in this field.

Research Progress In Health Function And Product Development Of Bee Pollen, Zheng Hui, Liang Qianqian, Chen Xiping, Cui Zhaowei, Li Yinxia, Li Shunxiang, Yang Yong

Food and Machinery

This review summarized the health functions of bee pollen in strengthening the immune system, antioxidation, inhibiting tumor, reducing blood glucose, preventing benign prostatic hyperplasia, protecting of hepatocytic injury, anti-inflammatory and inhibition of brown pigment production. Moreover, the main problems in the development of bee pollen, such as wall-breaking and sensitization were also analyzed. The development status and technical reserve status in food, health care products and pharmaceuticals using bee pollen were briefly described, and this provided basis and reference for the development and utilization of bee pollen resources.

Regulatory Disclosure Policies And Potential Induced Changes In Behavior: An Outcome Evaluation Of Santa Clara County’S Enhanced Food Safety Program Elements, Christian Cruz

Master's Projects

Despite countless advances in food microbiology and public health regulations, foodborne illness continues to be a major strain on public health outcomes and a costly economic burden. In the United States, many agencies are responsible for ensuring the quality of food, both domestically produced and imported. States and localities are delegated the responsibility of identifying and ensuring sound practices in the latter stages of the food production process, namely the retail distribution of food products to consumers.

Regulatory policies across the nation have only recently incorporated the evidenced-based principles of hazard risk management (Law, 2003). Still, food-related acute gastrointestinal illnesses …

Encapsulation Of Astaxanthin-Enriched Camelina Seed Oil Obtained By Ethanol-Modified Supercritical Carbon Dioxide Extraction, Liyang Xie

Department of Food Science and Technology: Dissertations, Theses, and Student Research

Astaxanthin is a high-value carotenoid widely used in the food, feed, nutraceutical, and pharmaceutical industries. Natural sources of astaxanthin are preferable to synthetic sources. However, current sources of natural astaxanthin are limited and fall short of global demand. In addition, effective extraction and stabilization strategies are needed before the utilization of natural astaxanthin in food applications. This work investigated 1) the feasibility of ethanol-modified supercritical carbon dioxide (SC-CO2) extraction of astaxanthin from engineered camelina seed, a potential source of natural astaxanthin, and 2) the potential of an emulsion-based system to protect astaxanthin after extraction. The physical properties of the emulsion …

Simultaneous Uplc-Ms/Ms Analysis Of Lovastatin And Its Analogue For Functional Foods, Han Zhi, Gong Lei, Wang Huixia, Zhu Xiaoling, Wang Bin, Cao Qi, Wu Wanqin

Food and Machinery

A ultra-high performance liquid chromatography-tandem mass spectrometric (UPLC-MS/MS) assay method has been developed and fully validated for the simultaneous quantification of lovastatin, simvastatin, mevastatin, lovastatin sodium hydroxide, dehydro lovastatin. The samples were extracted with methanol and separated on a Waters Acquity HSS T3 column. The mobile phase consisting of 0.1% aqueous formic acid solution and acetonitrile using gradient elution at a flow rate of 0.3 mL/min. The positive and negative ions were scanned simultaneously. The multiple reaction monitoring (MRM) mode was used for detection. The results showed that the five compounds were separated well within five minutes. The limits of …

Effect Of The Degree Of Amylopectin Polymerization On Physicochemical Properties Of Jackfruit Seed Starch, Zhang Yutong, Zhang Yanjun, Zhu Kexue, Xu Fei, Li Shize, Wu Gang, Tan Lehe

Food and Machinery

The amylose and amylopectin were separated by jackfruit seed starch (JFSS), and the same amylose (50%) was mixed with five different types of amylopectin to prepare JFSS (M1′, M5′, M6′, M11′, and BD′) with different degree of amylopectin polymerization. The effect of the degree of amylopectin polymerization on physicochemical properties of JFSS was investigated. M1′ had the lowest degree of amylopectin polymerization (189 506), while BD′ had the highest (431 481). As the degree of amylopectin polymerization increased, the syneresis, gelatinization enthalpy, peak viscosity, trough viscosity, breakdown, final viscosity, setback, relative crystallinity, and absorbance ratios of the five JFSS samples …

Effect Of Wheat Flour Characteristics On The Quality Of Buckwheat Chinese Steamed Bread Premix, Zheng Yujiao, Guo Xiaona, Zhu Kexue

Food and Machinery

The basic properties, dough rheological properties and fermentation characteristics of 8 different wheat flours were determined, and the buckwheat Chinese steamed bread（CSB）was prepared by using the buckwheat CSB premix prepared by the method. The specific volume, texture characteristics and sensory quality of the buckwheat CSB were determined. To explore the effect of wheat flour characteristics on the quality of buckwheat CSB premix. The results showed that wheat flour of the content of wet gluten was between 33% and 34%, the protein content was between 11% and 12% had less protein weakening, the dough formation time and stability time were longer, …

Detection Of Hydroxyapatite In Milk Powder, Zhu Lixian, Lin Qinbao, Zhong Huaining, Wang Liang, Pan Jingjing

Food and Machinery

The milk powder was dissolved in ultrapure water, and the inorganics-rich components in the milk powder were extracted after ultrasonication, centrifugation and vacuum freeze-drying, and the inorganics-rich components in the milk powder were qualitatively analyzed by X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy. In addition, different concentrations of needle-like nano-hydroxyapatite reference standard were added to the blank milk powder sample, and the same prelimina-ry treatment and analysis as the milk powder samples was carried out. The morphology and nano-size of the inorganics-rich components in sample 1 and spiked sample were characterized by scanning electron microscopy (SEM) and transmission …

Change In The Quality Of Coix Seed During Storage, Luan Linlin, Lu Hongmei, Chen Li, Yang Fengyi, Wu Yuzhang, Mou Cancan

Food and Machinery

The aim of the study was to explore quality of coix seed grown in Xingren, Guizhou (China) during storage. The results indicated that, color, ordor, main contents and correlate indexs of coix seed changed significantly during storage, which reflect the quality of coix seed decreases. Results: the color of coix seed changed with storing time lengthening. Original milky white, glossy coix seed became dimmed with yellowish and grayish with storing period lengthens. The odor was also from the original sweet aroma, which was ultimate rancidity. The rancidity of coix seed bacame stronger with storing time lengthening. During storage period, there …

Research On Apple Image Recognition Technology Based On Improved Lenet Convolution Neural Network In Natural Scene, Cheng Hongfang, Zhang Chunyou

Food and Machinery

In order to avoid the influence of illumination condition, overlap and other occlusion on image recognition, an improved LeNet convolution neural network is used to improve the structure of the traditional content-based recognition method. An Apple target recognition model based on the improved LeNet convolution neural network is designed and used to avoid the influence of illumination condition, overlap and other occlusion factors on image recognition. The model trains and validates Apple images in different scenarios. The results show that the network model can effectively recognize apple images. The recognition rates of independent fruits, occluded fruits, overlapping fruits and adjacent …