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Articles 2881 - 2910 of 4816
Full-Text Articles in Food Biotechnology
The Extraction Process Of Polyphenols From Porphyra Haitanensis And Their Antioxidant And Antimicrobial Activities In Vitro, Chen Hongbin, Song Lulu, Jin Jinxuan, Cheng Yongqiang
The Extraction Process Of Polyphenols From Porphyra Haitanensis And Their Antioxidant And Antimicrobial Activities In Vitro, Chen Hongbin, Song Lulu, Jin Jinxuan, Cheng Yongqiang
Food and Machinery
The Optimization of the extraction of polyphenols from Porphyra haitanensis and their antioxidant and antimicrobial activities in vitro were studied. The effects of liquid-material ratio, ultrasonic times and ethanol concentration on the contents of polyphenols from P. haitanensis were investigated. Moreover, the response surface analysis method was applied to determine the optimization of the extraction. The results showed that the optimum condition for the ultrasonic-assisted extraction of polyphenols was as follows: liquid-material ratio 35∶1 (mL/g), ultrasonic times 43 min and ethanol concentration 66%. Under the optimum condition, the contents of polyphenols was (6.85±0.13) mg GAE/g. The research of their antioxidant …
Advances On Extraction And Function Of Anoectochilus Roxburghii Polysaccharide, Chen Chengli, Dong Quan, Zhou Yu, Yan Min
Advances On Extraction And Function Of Anoectochilus Roxburghii Polysaccharide, Chen Chengli, Dong Quan, Zhou Yu, Yan Min
Food and Machinery
Anoectochilus roxburghii polysaccharide (ARP) is a kind of bioactive substance, consisting of monosaccharides polymerized by glycoside bonds. It is extracted from Anoectochilus roxburghii and has effective functions to decrease blood sugar and blood fat, and to protect liver and kidney. It also has excellent effects on sleep promotion, anti-tumor, and immunity enhancement. Based on the research of ARP in recent years, this article reviewes the extraction methods of ARP and mechanism of its biological activity, briefly analyzes the characteristic of its structure, and summarizes the differences in the content of different sources of ARP and the application of ARP in …
Effect Of Drying Methods On Quality And Antioxidant Properties Of Apricot Powder, Zhao Hongxia, Wang Yingqiang, Wen Jianhua, Wen Wen, Mao Yaqian, Song Wenli
Effect Of Drying Methods On Quality And Antioxidant Properties Of Apricot Powder, Zhao Hongxia, Wang Yingqiang, Wen Jianhua, Wen Wen, Mao Yaqian, Song Wenli
Food and Machinery
The natural apricot powder was prepared by microwave drying (MD), hot air drying (HAD), microwave vacuum drying (MVD) and microwave convection drying (MCD) and their nutritional, physical, sensory and antioxidant propertieswere compared. Significant differences among the determined quality terms of the four products were observed（P＜0.05）, the MVD and MCD products had the higher total sugar and reducing sugarand the latter had the least loss in total phenol and VC content while the HAD product the best retention of total acid, the apricot meat powder prepared by MD had the lowest hygroscopicity and caking degree. The apricot meat powder prepared …
Study On Optimization Of Preparation Of Activated Carbons From Suaeda Salsa And Its Adsorption Activity, Fu Jianxin, Zhang Bingwen, Zhang Guixiang
Study On Optimization Of Preparation Of Activated Carbons From Suaeda Salsa And Its Adsorption Activity, Fu Jianxin, Zhang Bingwen, Zhang Guixiang
Food and Machinery
With the activated carbon iodine adsorption and yield as the optimization index, the process of Suaeda sasla carbon taking H3PO4-ZnCl2 as the dual activator was studied. The single-factor test was used to examine the effect of mass fraction of H3PO4-ZnCl2, activation temperature, and the activation time on activated carbon preparation. The optimum conditions for the preparation of S. sasla based activated carbon by orthogonal experiments were as follows: H3PO4-ZnCl2 mass fraction 30%, activation temperature 500 ℃, activation time 80 min. Under these conditions, the …
Screening And Expression Identification Of Staphylococcus Aureus-Inhibiting Peptide Genes From Lactic Acid Bacteria, Ren Dayong, Zhu Jianwei, Liu Hongyan, Yu Hansong
Screening And Expression Identification Of Staphylococcus Aureus-Inhibiting Peptide Genes From Lactic Acid Bacteria, Ren Dayong, Zhu Jianwei, Liu Hongyan, Yu Hansong
Food and Machinery
The 7 strains with antimicrobial activity were screened as samples and verification by PCR amplification has antimicrobial peptide genes of PlnF, PlnE, PlnN, PlnJ, and PlnK. Then designed a primer to introduce Nco I and Xho I sites into both ends of the antibacterial peptide genes with the treated of pET28a plasmid to obtain recombinant plasmid using T4 ligase, and the pET28a-peptide was transformed into E.coli BL21(DE3). The experiment results showed that the inhibition zone of the pET28a-peptide was the PlnF, after 0.5 mmol/L IPTG inducted for 6 h after the OD600=0.6 of the E.coli LB. The cell …
Determinants Factors And The Strategies Of Improving Thermostability Of Thermophilic Α-Amylase, Li Caiming, Chen Shuangdi, Gu Zhengbiao, Hong Yan, Cheng Li, Li Zhaofeng
Determinants Factors And The Strategies Of Improving Thermostability Of Thermophilic Α-Amylase, Li Caiming, Chen Shuangdi, Gu Zhengbiao, Hong Yan, Cheng Li, Li Zhaofeng
Food and Machinery
This review clarified the microbial origin and properties of thermophilic α-amylase, and analyzed eight factors affecting their thermostability. The strategies to improve the thermostability of thermophilic α-amylase were proposed, which provided a reference for improving the thermostability technology of thermophilic α-amylase.
Effect Of Enzymatic Glycosylation Modification On Partial Structural And Rheological Properties Of Zein, Qu Yue, Wang Xiaojie, Liu Xiaolan, Cong Wansuo
Effect Of Enzymatic Glycosylation Modification On Partial Structural And Rheological Properties Of Zein, Qu Yue, Wang Xiaojie, Liu Xiaolan, Cong Wansuo
Food and Machinery
In order to improve the bioavailability of zein, which was modified by using the microbial transglutaminase and chitosan. Effects of the enzymatic glycosylation modification on the partial structural and rheological properties of zein were studied. Compared to original zein, the free sulfhydryl groups of the glycosylated zein decreased by 32.37 μmoL/g, the denaturation temperature and the denaturation enthalpy of the glycosylated zein increased by 11 ℃ and 72.3 J/g, respectively. These results suggest that thermal stability of the zein was increased by enzymatic glycosylation reaction.At shearing rate ranging from 1 to 100 s-1, the dispersions of zein and …
Extraction Of Soybean Oil Body Based On Soymilk Model System, Tian Qiying, Hua Yufei, Chen Yeming, Kong Xiangzhen, Zhang Caimeng, Wang Jing
Extraction Of Soybean Oil Body Based On Soymilk Model System, Tian Qiying, Hua Yufei, Chen Yeming, Kong Xiangzhen, Zhang Caimeng, Wang Jing
Food and Machinery
In order to study the volatile flavor of soymilk, a soymilk simulation system with soybean oil body as substrate was constructed, The effects of different pH on the components, particle size and flavor of soybean oil body extracted from soybean milk were studied in the oil body extraction process. The results showed that when the extraction pH increased from 7 to 11, the content of oil body protein decreased by 38.40%, the neutral fat content increased by 7.26%, and the phospholipid content decreased by 49.31%. The oil particle size decreased gradually by 89.2 nm and tended to be stable. Volatile …
Study On Edible Quality And Protein Stability Of Beef And Goat In Shaanxi Province, Wei Yanchao, Cao Jianxin, Liu Manshun, Liu Yongfeng
Study On Edible Quality And Protein Stability Of Beef And Goat In Shaanxi Province, Wei Yanchao, Cao Jianxin, Liu Manshun, Liu Yongfeng
Food and Machinery
The differences were studied including color, tenderness, pH, protein degradation, and other indicators of beef and mutton at the best slaughter ages of cattle and sheep and the high and low-grade parts of the meat. Samples of longissimus dorsi (YH, NH) and abdominal muscles (YL, NL) of post-mortem Qinchuan beef and horizontal goat meat were taken for determination of pH, color, shear, sarcoplasmic and myofibrillar proteins, the solubility and degradation polymerization conditions. The results shown that the pH value of YL was significantly higher than that of YH (P＜0.05), there was no significant difference between the two parts of beef …
Study On The Drying Kinetics Of Longan With Intermittent Vacuum-Microwave, An Kejing, Xiao Gengsheng, Wei Lai, Yu Yuanshan, Tang Daobang, Wen Jing, Lin Xian
Study On The Drying Kinetics Of Longan With Intermittent Vacuum-Microwave, An Kejing, Xiao Gengsheng, Wei Lai, Yu Yuanshan, Tang Daobang, Wen Jing, Lin Xian
Food and Machinery
Aiming at the problem of uneven heating of longan, excessive microwave drying rate and local over-focus, the vacuum microwave drying was carried out by the combination of intermittent microwave and variable power microwave. In this paper,the changes of water ratio and drying rate in the vacuum microwave drying process were analyzed, such as the power density, vacuum degree and loading quantity. Seven thin layer fitting models were tested. The orthogonal experiment of three factors and three levels for color, total phenolic content and rehydration evaluation was established. The optimum intermittent vacuum microwave drying process of longan was optimized. The results …
Drying Characteristics Of Direct-Contact Ultrasound Enhanced Hot-Air Drying Of Pear Slices, Sun Changying, Liu Yunhong, Zeng Ya, Shi Xiaowei, Xi Huihan
Drying Characteristics Of Direct-Contact Ultrasound Enhanced Hot-Air Drying Of Pear Slices, Sun Changying, Liu Yunhong, Zeng Ya, Shi Xiaowei, Xi Huihan
Food and Machinery
In order to explore the enhancing effect of contact ultrasound on hot air drying process, ultrasound enhanced hot air drying of pear slices was performed. The effects of different ultrasound powers and drying temperatures on drying characteristics and several quality indicators of pear slices were studied. The results showed that the improvement of hot air temperature and ultrasound power could significantly reduce drying time, and the stronger ultrasound enhanced effects could be achieved at lower temperatures. The BP neural network model was applied to predict the process of ultrasound enhanced hot air drying with high fitting precision. The cavitation and …
Valuable Components Analysis And Nutritional Evaluation On Antarctic Krill (Euphausia Superba) Meals, Quan Qinguo, Duan Weiwen, Zeng Xuege, Chen Ming, Zhang Zewei, Hao Jiming, Liu Shucheng, Ji Hongwu
Valuable Components Analysis And Nutritional Evaluation On Antarctic Krill (Euphausia Superba) Meals, Quan Qinguo, Duan Weiwen, Zeng Xuege, Chen Ming, Zhang Zewei, Hao Jiming, Liu Shucheng, Ji Hongwu
Food and Machinery
Key components of Antarctic Krill meals were analyzed such as protein, lipids, minerals and chitin content. Composition and content of amino acids, fatty acids and mineral element were also researched using nutritional assessment strategies in this paper. Finally, the protein processing base material was prepared by two steps include sieving and defatting. The results showed that the content of protein was 61.38%, lipids was 14.49%, chitin was 6.08% and mineral element was 6.27%. Protein of Antarctic Krill meals was a high quality protein referenced by FAO/WHO based on the total amino acid content of 47.34%, essential amino acid content of …
Analysis Of Changes In The Nutrients And The Antioxidant Activities For Rosa Sterilis D.Shi During Development, Xie Guofang, Wang Yubo, Kong Deyin, Wang Lirong, Zhou Xiaoli, Zhao Zhibing, Liu Yongling
Analysis Of Changes In The Nutrients And The Antioxidant Activities For Rosa Sterilis D.Shi During Development, Xie Guofang, Wang Yubo, Kong Deyin, Wang Lirong, Zhou Xiaoli, Zhao Zhibing, Liu Yongling
Food and Machinery
To understand the changes of the main nutrients and antioxidant activities of Rosa sterilis D.Shi during development. The changes of the main nutrients of Rosa sterilis D.Shi, including cellulose during development, reducing sugar, protein, ascorbic acid, total flavonoids, and total polyphenols, were investigated. The antioxidant capacity was analyzed by using the DPPH, ABTS, and FRAP. The antioxidant nutrients were determined by correlation analysis and principal component analysis. The results showed that there were differences in changes of nutrients and antioxidant activities of Rosa sterilis D.Shi during development. The content of cellulose and protein decreased with the development. The content of …
Determination And Comparison Of Hydrolyzed Amino Acids And Free Amino Acids In Six Kinds Of Grape Seeds, Wei Yangfei, Song Hai, Yue Guoren, Zhang Hongxi, Li Caixia
Determination And Comparison Of Hydrolyzed Amino Acids And Free Amino Acids In Six Kinds Of Grape Seeds, Wei Yangfei, Song Hai, Yue Guoren, Zhang Hongxi, Li Caixia
Food and Machinery
High performance liquid chromatography(HPLC) was developed to detect the hydrolyzed amino acids and free amino acids in grape seeds with phenyl isothiocyanate(PITC) as the derivative reagent. For chromatographic analysis, a Thermo AcclaimTM 120 C18 column (250 mm × 4.6 mm, 5 μm) was used. The mobile phase consisted of solvent A and B with the flow rate of 1.0 mL/min by gradient elution. Solvent A was sodium acetate buffer solution (pH 6.5) and solvent B was methanol-acetonitrile-water (20∶60∶20, v/v/v). The temperature of column was maintained at 30 ℃. The wavelength was set at 254 nm. The results showed …
Highly Sensitive Detection Of Bisphenol A Based On Fret From Up-Conversion Nanoparticles To Gold Nanoparticles, Xu Zhou, Lu Shizhen, Chen Maolong, Zhu Yingyue, Ding Li, Cheng Yunhui
Highly Sensitive Detection Of Bisphenol A Based On Fret From Up-Conversion Nanoparticles To Gold Nanoparticles, Xu Zhou, Lu Shizhen, Chen Maolong, Zhu Yingyue, Ding Li, Cheng Yunhui
Food and Machinery
The 13 nm gold nanoparticles were synthesized and were modified with Bisphenol A(BPA) aptamer. The oil-solubility Up-conversion nanoparticles (UCNPs) were modified with polyacrylic acid (PAA) to form water-solubility UCNPs. Then water-solubility UCNPs were coated with the complementary DNA strand. Based these nanoparticles, a FRET aptasensor for BPA was successfully fabricated by using Up-conversion nanoparticles as energy donor and gold nanoparticles as energy acceptor. The results show that the detection system has a good linear relationship at 1×10-9～1×10-3 mol/L (R2=0.992 3), and the detection limit is as low as 1×10-10 mol/L. The method is proved …
Simultaneously Determination Of Nine Kinds Of Pesticide Residues In Dark Tea By Gas Chromatography-Tandem Mass Spectrometry（Gc-Ms/Ms）, Cheng Shuilian, He Jianguo, Huang Jing, Lu Guiying
Simultaneously Determination Of Nine Kinds Of Pesticide Residues In Dark Tea By Gas Chromatography-Tandem Mass Spectrometry（Gc-Ms/Ms）, Cheng Shuilian, He Jianguo, Huang Jing, Lu Guiying
Food and Machinery
Developed a qualitative and quantitative analysis method which simultaneously determined nine kinds of pesticide residues in dark tea by gas chromatography in combination with triple quadrupole mass spectrometry. After being extracted by acetonitrile and purified by Cleanert TPT solid-phase extraction column,they were analyzed by GC-triple quadrupole MS.The results showed that the calibration cure for nine kinds of pesticide was the linear in the range of 0.4～3.2 mg/L and peak area,each correlation coefficient is above 0.99,and the relative standard deviation(RSD) was between 1.5% and 5.6%. At the same time, the average recovery was ranged from 81.6% to 98.6%,and the determining limits …
Quick Determination Of Chemical Constituents In Prunus Cerasifera Leave By Uplc-Uv-Qda, Liu Wei, Liu Tianqi, Ge Yuwei, Ouyang Yan
Quick Determination Of Chemical Constituents In Prunus Cerasifera Leave By Uplc-Uv-Qda, Liu Wei, Liu Tianqi, Ge Yuwei, Ouyang Yan
Food and Machinery
UPLC-UV-QDa technique, combined with the acidic hydrolysis experiment were applied to quantitative and qualitative analysis flavonoid aglycones and methanol extracts from leaves of four different kinds of Prunus cerasifera. The result showed that quercetin and kaempferol were well separated in 7.0 minutes and had good linear relationship, the average recoveries of two flavonoid aglycones were 98.65% and 102.02% with RSD 1.08%(n=3) and 1.17%(n=3), the method was proved to be fast, accurate and repeatable. There was some difference in the content of flavonoid aglycone from different kinds of Prunus cerasifera in different environment, two flavonoid aglycones were found in all kinds …
Research On Food Safety Traceability System Based On Iot And Blockchain Technology, Zeng Xiaoqing, Peng Yue, Wang Qi
Research On Food Safety Traceability System Based On Iot And Blockchain Technology, Zeng Xiaoqing, Peng Yue, Wang Qi
Food and Machinery
According to the shortcomings of current food traceability system on account of inconsistency in technological standards, non-transparency in information, liability to be tampered, serious centralization and information islands, this paper explores the key standards and technologies of food traceability, establishes a traceability system structure and designs a food traceability process based on Internet of Things and blockchain. By adopting the alliance blockchain model and the Hyperledger development platform, implemented a traceability prototype system. It fully demonstrates that our technological solution can significantly improve efficiency and transparency of the food supply chain, which will obviously enhance the food safety and rebuild …
Cfd Simulation Analysis And Experimental Verification Of Twin Screw Compressor, Long Ji, He Xueming, Jiang Zhengang
Cfd Simulation Analysis And Experimental Verification Of Twin Screw Compressor, Long Ji, He Xueming, Jiang Zhengang
Food and Machinery
In view of the complex and time changing characteristics of the fluid domain in the twin screw compressor, and in order to study it’s performance characteristics in detail, used STAR CCM＋software to do the computational fluid dynamics (CFD) analysis, and the experimental platform was built to verify the accuracy of the simulation results. By comparing the pressure values of the simulated monitoring points and the experimental measured points corresponding to them, both of them have good consistency in the pressure value and the period of pressure fluctuation.
Improvement Of Transmission Shaft Connecting Ch And Cv In Gdx2 Packer, Wang Guangsheng, Wang Wenhui, Cao Xingqiang, Wang Zhongqing, Yang Guanglu
Improvement Of Transmission Shaft Connecting Ch And Cv In Gdx2 Packer, Wang Guangsheng, Wang Wenhui, Cao Xingqiang, Wang Zhongqing, Yang Guanglu
Food and Machinery
The transmission shaft connecting CH and CV in GDX2 packer always breaks down due to attrition. Its integrated design and small repair space make it time-and-energy consuming to replace the damaged transmission shaft, which inspires us to improve itsuniversal joints. Based on its original transmission principle, we substitute the fast respectively demountable units for the transmission gear, which made the installment more efficient. While repairing, only the broken units needed to be beplaced. The application result showed that the improved universal joints function reliably, with less labors, and greatly increased the effective operation rate because of its simple structure.
Design Of A Domestic Small Solar Composting Box, Yu Peibin, Chen Jianxin, Li Yanwu
Design Of A Domestic Small Solar Composting Box, Yu Peibin, Chen Jianxin, Li Yanwu
Food and Machinery
In view of the current market common kitchen waste composting box is not easy to keep warm, the composting time is long, the effect of drainage is poor, the odor is heavy and so on. A small household composting box is designed and its spatial structure is designed and optimized. The device includes several modules, such as solar collector, solar panel, ventilator, feeding port, leachate screen, tail gas treatment and so on. It can better meet the requirements of high temperature aerobic composting process. It uses solar energy for the whole system of heat preservation, ventilation and energy supply, reducing …
Effect Of Co2 Method On Monitoring Mildew Of Stored Grain In Warehouse And Its Main Influencing Factors, Bei Jingjing, Zhai Huanchen, Zhang Shuaibing, Lu Yangyong, Cai Jingping
Effect Of Co2 Method On Monitoring Mildew Of Stored Grain In Warehouse And Its Main Influencing Factors, Bei Jingjing, Zhai Huanchen, Zhang Shuaibing, Lu Yangyong, Cai Jingping
Food and Machinery
The mildew of stored grain will affect the safety of food，which can be monitored by the method of detecting the change of carbon dioxide (CO2) concentration in grain bulk. As an indirect method, it is necessary to analyze comprehensively the related factors of grain bulk and the parameters of CO2 sensor, which cansignificantly affect the detection value. The results showed that the mould count in the initial stage of the stored grain fungi growth was synchronized with the change of CO2 concentration at different temperatures, and the correlation coefficient was greater than 0.99. CO2 production …
Study On Coating Preservation Of Litsea Cubeba Essential Oil And Chitosan On Kumquat, Peng Xianglian, Fu Hongjun, Fan Li
Study On Coating Preservation Of Litsea Cubeba Essential Oil And Chitosan On Kumquat, Peng Xianglian, Fu Hongjun, Fan Li
Food and Machinery
In order to prolong the shelf life of kumquat, kumquat fruits were treated with coating preservation of litsea cubeba essential oil and chitosan, then stored at room temperature conditions, the changes of weight-loss rate, soluble solids, titratable acid, vitamin C(VC), total sugar, sensory index in fruits during storage were investigated. The results showed that the composite coating of Litsea cubeba essential oil and chitosan inhibited the weight-loss of the kumquat, soluble solids, titratable acid, VC, total sugar and sensory of the treated group were better than the control group. The weight-loss rate, soluble solids, and V …
Effects Of Maillard-Type Glycosylation On Antioxidant Activity Of Corn Protein Hydrolysates, Liu Xiang, Zheng Xiqun, Liu Xiaolan
Effects Of Maillard-Type Glycosylation On Antioxidant Activity Of Corn Protein Hydrolysates, Liu Xiang, Zheng Xiqun, Liu Xiaolan
Food and Machinery
Protamex and alcalase were synergistically used for hyolorlysis of corn protein and the hydrolysates were glycosylated with oligochitosan by Maillard reaction. The antioxidant activities of corn protein hydrolysates (prepared under different protein/enzyme rattios) and glycosylation products were studied. The resultsshowed that both of the enzymatic hydrolysates and glycosylation products had good antioxidant activity, and-the Maillard glycosylation reaction could improve the antioxidant activity of corn hydrolysates. When the protein concentration of glycosylation products was 5 mg/mL, clearance rate of·OH and DPPH· reached to 90.91% and 90.91%, respectively,which increased 48.78% and 32.26%, compared to non-glycosylated hydrolysates.Similarly,when the protein concentration of glycosylation products …
Optimization Of Polysaccharides Extractedand Analysis From Zingiber Officinale Rosc, Liao Dengwei, Huang Dechun, Cheng Shujie, Cao Chongjiang, Chen Guitang
Optimization Of Polysaccharides Extractedand Analysis From Zingiber Officinale Rosc, Liao Dengwei, Huang Dechun, Cheng Shujie, Cao Chongjiang, Chen Guitang
Food and Machinery
The polysaccharides from Zingiber officinale Rosc were extracted by hot water extraction method, ultrasonic ice bath extraction method and complex enzymatic hydrolysis method. The effects of different methods on the extraction were investigated by the UV spectra image and the scanning electron microscope image of ginger residue. The results showed that the polysaccharides extraction rates of the three different extraction processes under optimal extraction conditions were (11.74±0.23)%, (7.00±0.04)%, and (20.93±0.20)%, and the yields were (6.53±0.08)%, (2.56±0.11)%, and (14.67±0.32)%, the purity was (86.53±0.20)%, (59.84±0.06)%, and (73.59±0.19)%. Comparing with three different methods, the enzymatic hydrolysis method had the highest extraction rate and …
Extraction And Antioxidant Activities Of Flavonoids From Coreopsis Tinctoria Nutt Tea, Wang Jiani, Ming Jian, Tian Yong, Wang Rongjie, Li Fuxiang
Extraction And Antioxidant Activities Of Flavonoids From Coreopsis Tinctoria Nutt Tea, Wang Jiani, Ming Jian, Tian Yong, Wang Rongjie, Li Fuxiang
Food and Machinery
The optimization of the flavonoids extraction technique of Coreopsis tinctoria Nutt tea and the vitro antioxidant activity of flavonoids was studied by taking the Coreopsis tinctoria Nutt tea as the raw material, and basing the single factor experiment and Box-Behnken methodology. Results:The optimal extraction conditions of flavonoids from Coreopsis tinctoria Nutt tea were: extraction time 13 min, extraction temperature 98 ℃, the ratio of solid to liquid 1∶78 (g/mL). Under the conditions, the flavonoids extraction rate was (20.39±0.07)%. The half inhibiting concentrations (IC50) to FRAP and DPPH free radical scavenging were (137.98±1.56) μg/mL and (82.40±1.98) μg/mL, respectively. The …
Study On The Bioactive Ingredients And Antioxidant Activities Of 6 Kinds Of Edible Flowers, Zhang Dongfeng, Liu Qi, Zhang Xinyue, Zhang Jiaqi, Fu Xinjing, Lu Jun
Study On The Bioactive Ingredients And Antioxidant Activities Of 6 Kinds Of Edible Flowers, Zhang Dongfeng, Liu Qi, Zhang Xinyue, Zhang Jiaqi, Fu Xinjing, Lu Jun
Food and Machinery
In this study, the bioactive compounds of 6 common edible flowers were extracted by ultrasonic extraction method and their antioxidant activities were assessed. The content of flower active ingredients such as polyphenols, flavonoids, anthocyanins and carotenoids were determined by ultraviolet spectrophotometry and HPLC. The content of these active compounds range from 6.20～63.17 mg GAE/g ·DW, 12.52～180.47 CE /g· DW, 4.17～40.91 mg CyA/g· DW and 0.33～0.68 mg/g ·DW, respectively. The antioxidant activities were assessed by DPPH, FRAP and ABTS assays, range from 45.13～1 092.49, 100.20～2 621.25 and 100.12～1 708.03 μmol TE/g DW respectively.
Ultrasonic-Assisted Extraction Essential Oil Of Lemon And Chemical Composition Analysis, Xiao Juan, Zhou Kang, Hu Bin, Su Zhao
Ultrasonic-Assisted Extraction Essential Oil Of Lemon And Chemical Composition Analysis, Xiao Juan, Zhou Kang, Hu Bin, Su Zhao
Food and Machinery
Ultrasonic-assisted hydrodistillation extraction (UAHE) essential oil from lemon peel was investigated. On the basis of single-factor test, response surface methodology was applied to optimize the parameters of extraction, including ultrasonic power, solvent to material ratio, ultrasonic time, and distilling time on the yield of essential oil. Meanwhile, the volatile composition was analyzed by GC-MS. In addition, the microscopic structures of material before and after various extraction methods are observed to clarify extraction mechanisms. The optimal extraction conditions were ultrasonic power of 320 W, solvent to material ratio of 15.5∶1 (mL/g), ultrasonic time of 36 min, distillation time of 140 min. …
Research Progress Of The Detection Mechanism Of Luminescent Bacterial Toxicity And Its Application, Hu Xinying, He Zhifei, Li Hongjun
Research Progress Of The Detection Mechanism Of Luminescent Bacterial Toxicity And Its Application, Hu Xinying, He Zhifei, Li Hongjun
Food and Machinery
The paper describes the luminescent bacteria and the mechanism of detecting toxic and harmful substances. This paper reviews the recent advances in the application of luminescent bacteria in toxicity assessment and food safety testing. What’s more, the factors influencing the application of luminescent bacteria in food safety testing are pointed out, and the paper indicates the application research direction in this technical field.
Research Progress Of Specific Spoilage Organisms Quorum Sensing And Plant-Source Inhibitors In Aquatic Products, Lan Weiqing, Wang Meng, Chen Mengling, Xie Jing
Research Progress Of Specific Spoilage Organisms Quorum Sensing And Plant-Source Inhibitors In Aquatic Products, Lan Weiqing, Wang Meng, Chen Mengling, Xie Jing
Food and Machinery
The spoilage of aquatic products is mainly caused by microbial activities. In this paper, the Specific Spoilage Organisms (SSO) in aquatic products, Quorum Sensing (QS) signal of microbial molecules, the resource and function methods of QS inhibitors were described, respectively. The existing problems and solutions of current QS inhibitors from plant were proposed as well so as to provide the theoretical reference for the research of preservatives for controlling the QS in aquatic products.