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Microencapsulation of Fish Oil by Simple Coacervation of Hydroxypropyl Methylcellulose

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Chinese Journal of Chemistry 2005年第11期23卷 1569-1572页

作者： WU, ke-gang CHAI, Xiang-Hua CHEN, Yue Food Science and Bioengineering Department Guangdong University of Technology Guangzhou Guangdong 510090 China Biology Department Shantou University Shantou Guangdong 515063 China

To improve the oxidative stability and application of fish oil, it was microencapsulated by simple coacervation followed by spray drying. Simple coacervation took place by adding malt dextrin into the emulsion of fish oil and hydroxypropyl methylcellulose （HPMC） solution. Influences of several process parameters on the microencapsulation were evaluated and the oxidative stability and microstructure of microcapsules were analyzed. Results showed that the coacervation could be observed only when dextrose equivalent value （DE value） of malt dextrin, concentration of HPMC solution and fish oil percentage in microcapsules were no more than 20. 5% and 40%, respectively. Moreover, microencapsulation efficiency was higher at HPMC solution concentration of 4% and fish oil percentage of less than 30%. The oxidative stability of fish oil was improved by the microencapsulation and done best in the ease of replacing malt dextrin by 40% with acacia. Scanning electronic microscopic photographs showed that the microcapsule obtained was a round, smooth and hollow microcapsule with its wall made up of innumerable small and solid submicrocapsules with the core of fish oil.

关键词： fish oil hydroxypropyl methylcellulose malt dextrin microencapsulafion simple coacervation

Anomalous Kondo-Switching Effect of a Spin-Flip Quantum Dot Embedded in an Aharonov-Bohm Ring

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Communications in Theoretical Physics 2009年第11期52卷 945-948页

作者： CHEN Xiong-Wen SHI Zhen-gang SONG ke-Hui Department of Physics and Electronic Information Science Huaihua University Huaihua 418008 China

We theoretically investigate the Kondo effect of a quantum dot embedded in a mesoscopic Aharonov-Bohm （AIR） ring in the presence of the spin flip processes by means of the one-impurity Anderson Hamiltonian. Based on the slave-boson mean-field theory, we find that in this system the persistent current （PC） sensitively depends on the parity and size of the AB ring and can be tuned by the spin-flip scattering （R）. In the small AB ring, the PC is suppressed due to the enhancing R weakening the Kondo resonance. On the contrary, in the large AB ring, with R increasing, the peak of PC firstly moves up to max-peak and then down. Especially, the PC phase shift of π appears suddenly with the proper value of R, implying the existence of the anomalous Kondo effect in this system. Thus this system may be a carldidate for quantum switch.

关键词： persistent current quantum dot Kondo effect spin-flip scattering effect

On-line least squares support vector machine algorithm in gas prediction

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Mining Science and Technology 2009年第2期19卷 194-198页

作者： ZHAO Xiao-hu WANG gang ZHAO ke-ke TAN De-jian School of Information ＆ Electronic Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Traditional coal mine safety prediction methods are off-line and do not have dynamic prediction *** Support Vector Machine(SVM) is a new machine learning algorithm that has excellent *** least squares support vector machine(LS-SVM) algorithm is an improved algorithm of *** the common LS-SVM algorithm,used directly in safety predictions,has some *** have first studied gas prediction problems and the basic theory of *** these problems,we have investigated the affect of the time factor about safety prediction and present an on-line prediction algorithm,based on ***,given our observed data,we used the on-line algorithm to predict gas emissions and used other related algorithm to compare its *** simulation results have verified the validity of the new algorithm.

关键词： LS-SVM gas on-line learning prediction

Facile fabrication of Fe/Zr binary MOFs for arsenic removal in water:High capacity,fast kinetics and good reusability

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Journal of Environmental Sciences 2023年第6期128卷 213-223页

作者： Qi Guo Yuan Li Li-Wei Zheng Xiao-YangWei Yan Xu Yi-Wen Shen ke-gang Zhang Chun-gang Yuan Hebei key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science&EngineeringNorth China Electric Power UniversityBaoding 071000China Wetland Research Center for Baiyangdian Lake North China Electric Power UniversityBaoding 071000China

A water-stable bimetallic Fe/Zrmetal-organic framework[UiO-66(Fe/Zr)]for exceptional decontamination of arsenic in water was fabricated through a facile one-step *** batch adsorption experiments revealed the excellent performances with ultrafast adsorption kinetics due to the synergistic effects of two functional centers and large surface area(498.33 m^(2)/g).The absorption capacity of UiO-66(Fe/Zr)for arsenate[As(V)]and arsenite[As(III)]reached as high as 204.1 mg/g and 101.7 mg/g,*** model was suitable to describe the adsorption behaviors of arsenic on UiO-66(Fe/Zr).The fast kinetics(adsorption equilibrium in 30min,10mg/L As)and pseudo-second-ordermodel implied the strong chemisorption between arsenic ions and UiO-66(Fe/Zr),which was further confirmed by DFT theoretical *** results of FT-IR,XPS analysis and TCLP test demonstrated that arsenic was immobilized on the surface of UiO-66(Fe/Zr)through Fe/Zr-O-As bonds,and the leaching rates of the adsorbed As(III)and As(V)from the spent adsorbent were only 5.6%and 1.4%,***-66(Fe/Zr)can be regenerated for five cycles without obvious removal efficiency *** original arsenic(1.0mg/L)in lake and tapwater was effectively removed in 2.0 hr[99.0%of As(III)and 99.8%of As(V)].The bimetallic UiO-66(Fe/Zr)has great potentials in water deep purification of arsenic with fast kinetics and high capacity.

关键词： Arsenic Removal Metal-organic frameworks Bimetallic

Preparation and Characterization of Dichlorocarbene Modified Multiple-walled Carbon Nanotubes

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Chemical Research in Chinese Universities 2007年第5期23卷 505-507页

作者： YU Jin-gang HUANG ke-long HONG Yong HUANG Du-shu Institute of Functional Material and Chemistry College of Chemistry and Chemical Engineering Central South University Changsha 410083 P. R. China

Multiple-walled carbon nanotubes were functionalized by cycloaddition of *** chemical modification was performed by using chloroform and sodium *** phase transfer catalysts were used to increase the efficiency of the *** chloride used as phase transfer catalyst could highly enhance the effect of *** analysis was used to evaluate the degree of *** was performed using scanning electron microscopy（SEM）and transmission electron microscopy（TEM）.Fourier transform infrared spectroscopy（FTIR）and energy-dispersive X-ray spectroscopy（EDS）were used to confirm the resulting material.

关键词： Multiple-wa/led carbon nanotubes Modification Dichlorocarbene

Synthesis of Hydroxypropyl-β-cyclodextrin Bonded Silica-gel and its Application to Resolution

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Chinese Chemical Letters 2006年第12期17卷 1547-1550页

作者： Jin gang YU ke Long HUANG Du Shu HUANG Jin Yue PU Institute of Functional Material and Chemistry College of Chemistry and Chemical Engineering Central South University Changsha 410083

In order to set up a simple and effective method for resolution of optical isomers, hydroxypropyl-β-cyclodextrin was bonded to silica-gel, which can be used for preparation of thin-layer chromatography plates. Resolution of clenbuterol and propranolol were investigated on these thin-layer chromatography plates using different combinations of solvent systems at ambient temperature. The best simultaneous resolution was achieved in solvent system of acetonitrilen-butanol （50：50, v/v）. Rst values of resolution of clenbuterol hydrochloride and propranolol hydrochloride are 3.6 and 4.3, respectively. The spots of different enantiomers are separated clearly. The results showed that hydroxypropyl-β-cyclodextrin bonded silica-gel could be successful in resolution of chiral adrenergic drugs. The study offers a direct, rapid and reliable method for separation of this kind of optically active compounds.

关键词： Hydroxypropyl-β-cyclodextrin bonded silica gel synthesis resolution chiral enantiomers.

First-principles Calculations of Strengthening Compounds in Magnesium Alloy： A General Review

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Journal of Materials Science & Technology 2016年第12期32卷 1222-1231页

作者： Yong Liu Hui Ren Wen-Cheng Hu De-Jiang Li Xiao-Oin Zeng ke-gang Wang Jian Lu key Laboratory of Near Net Forming of Jiangxi Province. Nanchang University Nanchang 330031 China National Engineering Research Center of Light Alloys Net Forming Shanghai Jiao Tong University Shanghai 200240 China State key Laboratories of Metal Matrix Composite Shanghai Jiao Tong University Shanghai 200240 China Mechanical and Aerospace Engineering Department Florida Institute of Technology Melbourne FL 32901 USA Department of Mechanical and Biomedical Engineering City University of Hong Kong Kowloon Hong Kong China Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research Institute 8 Yuexing 1st Road Shenzhen Hi-Tech Industrial Park Nanshon District Shenzhen China

First-principles computation methods play an important role in developing and designing new magnesium *** this article,we present an overview of the first-principles modeling techniques used in recent years to simulate ideal models of the structure of strengthening compounds in Mg *** typical Mg compounds,structural stability,mechanical properties,electronic structure and thermodynamic properties have been ***,the elastic anisotropies of these compounds are examined,which is highly correlated with the possibility of inducing ***,some heterogeneous nucleation interfaces investigated by first-principles method are *** of the theoretical results are compared with available experimental *** hope to illustrate that the first-principles computation can help to accelerate the design of new Mg-based materials and the development of materials genome *** problems and future directions in this research field are considered.

关键词： Magnesium alloy Strengthening compounds First-principles calculation Mechanical properties Thermodynamic properties

Covalent modification of multiwalled carbon nanotubes with a low molecular weight chitosan

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Chinese Chemical Letters 2007年第3期18卷 361-364页

作者： gang ke Wen Chao Guan Chang Yu Tang Zhen Hu Wen Jie Guan Dan Lin Zeng Feng Deng Department of Chemistry Huazhong University of Science and Technology Wuhan 430074 China key Laboratory of Cellulose and Lignocellulosics Chemistry Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 China Department of Physics Wuhan University Wuhan 430072 China State key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China

Covalent modification of shortened multiwalled carbon nanombes （MWNTs） with a natural low molecular weight chitosan （LMCS） was accomplished by the nucleophilic substitution reaction. The LMCS modified MWNTs （MWNT-LMCS） were characterized by FTIR, solid-state ^13C NMR, and XPS spectroscopies, thermogravimetric analysis, and transmission electron microscopy. The results revealed that amino and primary hydroxyl groups of the LMCS participated mainly in the formation of the MWNT-LMCS conjugates. The MWNT-LMCS consists of 58 wt.% LMCS, and about four molecular chains of the LMCS were attached to 1000 carbon atoms of the nanotube sidewalls. As a novel derivative of the MWNTs, the MWNT-LMCS not only solved in DMF, DMAc and DMSO, but also in aqueous acetic acid solution.

关键词： Carbon nanotubes Chitosan Renewable resources Modification

Efficacy and safety of Yangxue Qingnao Granules in treatment of migraine:A systematic review and meta-analysis

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World Journal of Clinical Cases 2024年第2期12卷 335-345页

作者： Bo Zhou Gui-Shu Wang Yu-Ning Yao Tong Hao Huan-Qin Li ke-gang Cao Department of Neurology Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing 100091China Department of Infectious Disease Dongfang HospitalBeijing University of Chinese MedicineBeijing 100078China Institute for Brain Disorders Beijing University of Chinese MedicineBeijing 100700China Department of Acupuncture and Moxibustion Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical UniversityBeijing 100010China

BACKGROUND Yangxue Qingnao Granules(YXQN)is a Chinese patent medicine that has been commonly used in the clinical treatment of *** To assess the efficacy and safety of YXQN alone for the treatment of *** We searched 10 databases to identify relevant randomized controlled trials(RCTs)published before September *** review authors independently searched and screened the literature,extracted the data,and assessed the methodological quality of the studies using criteria from ROB 2.0,and analyzed the data using Review Manager 5.4 *** A total of 12 RCTs including 767 participants with migraine met the selection *** divided these studies into comparisons of YXQN with placebo,routine treatment drugs,and other Chinese patent *** meta-analysis showed the following:(1)Efficacy:The YXQN group outperformed the placebo group[relative risk(RR)=0.29,95%confidence interval(95%CI):0.15–0.43,P<0.00001],routine treatment group(RR=0.18,95%CI:0.09–0.27,P<0.0001),and Chinese patent medicine group(RR=0.27,95%CI:0.13–0.41,P<0.001);(2)frequency of headache:There was a significant difference between YXQN vs placebo[mean difference(MD)=-1.25,95%CI:-1.60 to-0.90,P<0.00001],routine treatment drugs(MD=-0.85,95%CI:-1.15 to-0.56,P<0.00001),and Chinese patent medicine(MD=-0.91,95%CI:-1.35 to-0.46,P<0.0001);(3)headache duration:We found great heterogeneity between studies,with no differences between YXQN and placebo(MD=-0.61,95%CI:-1.53 to-0.31,P=0.19)and routine treatment drugs(MD=-0.22,95%CI:-0.89 to 0.46,P<0.53).YXQN was more effective than other Chinese patent medicines in reducing headache duration(MD=-1.24,95%CI:-1.70 to-0.77,P<0.00001);and(4)headache severity:There was no significant difference between YXQN vs placebo(MD=-1.67,95%CI:-3.52 to 0.19,P=0.08),routine treatment drugs(MD=-0.53,95%CI:-2.02 to 0.96,P=0.68),and other Chinese patent medicines(MD=-0.49,95%CI:-2.83 to 1.85,P=0.68).Mild gastrointestinal adverse reactions were reported

关键词： Meta-analysis Migraine Yangxue Qingnao Granules Traditional Chinese patent medicine