bluuebunny/crossref_metadata_2025 huggingface dataset:
pH-Controlled Drug Release from Mesoporous Silica Spheres with Switchable Gates
Authors: Gao Qiang , Chen Zong Wei , Xu Jun , Xu Yao
Published: May 2011

Mesoporous silica sphere (MSS) with switchable gates was prepared by the graft of pH-sensitive propyldiethylenetriamine groups (multiamine chains) around mesopore outlets. The textural parameters of the resultant material had been analyzed. In the following test of in vitrodrug release, the gated mesoporous material showed high response to solution pH. At high pH (pH 7.5), ibuprofen (IBU) that loaded in this carrier released rapidly and completely (within 2 h); at low pH (pH 4.0 or 5.0), only a small part of the IBU (13 wt%) was slowly released from this carrier and the most of IBU was effectively confined in mesopores.
Rapid Purification of Anti-SARS-CoV Protein N Monoclonal Antibody by Using Magnetic Beads
Authors: Yu Yu Xi , Liu Xian Qiao
Published: May 2011

A rapid and simple antibody purification method is reported for the isolation of monoclonal antibody IgG1 from SARS-CoV N protein rabbit serum by using surface-modified magnetic beads. First magnetic poly (methacrylate-divinylbenzene) (PMA-DVB) beads were prepared and modified with aldehyde end group through surface chemical reactions. Then protein A were covalently bound to aldehyde-activated magnetic beads and further used to purify monoclonal antibody IgG1 from rabbit serum directly. This rapid magnetic carrier technology proves to be efficient and rapid for antibody purification and has potential to massive production of monoclonal antibody.
Predicting the Bending Size Dependency in Polymer Nanofiber Elasticity
Authors: Yuan Bo , Liu Qun Feng , Lin Cai , Chen Xiao Feng
Published: May 2011

In this paper, a strain gradient model is constructed to predict the bending size dependence of the elastic property of nanofibers under three-point tests. The model prediction shows that there are two kinds of size dependency for the bending tests: one is related to the diameter of the nanofiber, which can be named as Diameter Size Dependency (D-SD), the other is related to the length of the nanofiber, which can be termed as Length Size Dependency (L-SD). Mechanical testing on PCL nanofibers was performed to verify the model for D-SD, and good agreement is found between the model prediction and the data obtained in the experiment. The model can be applied to explain the size dependency in bending test for polymeric nanofibers.
Microstructures and Mechanical Properties of Bulk Nanocrystalline Fe3Al Materials With 5, 10 and 15 wt. % Cu Prepared by Aluminothermic Reaction
Authors: Wei Yu Peng , La Pei Qing , Que Mei Dan , Li Wen Sheng , Yang Yang , Wang Hong Ding , Lu Xue Feng , Zhao Yang , Cheng Chun Jie
Published: May 2011

Bulk nanocrystalline Fe3Al based materials with 5, 10 and 15 wt. % Cu were prepared by aluminothermic reaction in which the melts were superheated about 1600 K before solidification. Microstructures of those materials were investigated by optical microscope, electron probe microanalysis, X-ray diffraction and transmission electron microscope. It was shown that microstructures of the materials consisted of a nanocrystalline matrix phase and a little contamination Al2O3and Fe3AlCxfiber phases. The nanocrystalline matrix phase was composed of Fe, Al and Cu elements and disordered bcc which did not change with content of Cu. Average grain sizes of the nanocrystalline phase of the materials with 5, 10 and 15 wt. % Cu were 18, 24 and 25 nm respectively and that of the material with 5 wt. % Cu was the smallest. Compressive properties of the materials were tested. The material with 5 wt. % Cu has good ductility compared with the materials with 10 and 15 wt. % Cu. Yield strength of the materials was about two times higher than that of coarse grained Fe3Al material. The compressive yield strength of the material with 5 wt. % Cu was higher than those of the materials with 10 and 15 wt. % Cu and its flow stress in compression was up to about 1500 MPa.
Rheological and Flocculated Properties of Silver Nanoparticles Paste
Authors: Zhang Yu Yang , Wang Shi Xing
Published: May 2011

Silver nanoparticles pastes were formatted by mixing different volumetric silver nanoparticles with the mixture of 12.7wt% bismuth subgallate and 87.3wt% organic vehicle. Rheological and flocculated properties of silver nanoparticles pastes were examined. All pastes demonstrated pseudoplastic flow behaviors and shear thinning characters over the solids-loading and shear-rate range studied. The viscosities of pastes reduce with increasing the shear rate in a logarithmic plot. G' (storage modulus) and G" (loss modulus) increase with increasing silver nanoparticles content and frequency. At high loading, G' and G" begin to level off and exhibit plateau in the low-frequency range. The appearance of the plateau at low frequency is due to the presence of silver nanoparticles in the system and forming the three-dimensional network structure. The shear stress increases with increasing silver nanoparticles content. Apparent yield value estimated by casson equation exhibits a power-law dependence on particle volume fraction.
Preparation of Vitamin E Liposomes by the Thin Film Method and Study on its Leakage Rate
Authors: Zhang Wei Guang , Liang Ji Hong , Cai You Jie
Published: May 2011

This text adopted the thin film method to prepare the vitamin E liposomes, the influence of proportion of components in vitamin E liposomes, and experiment condition on the envelopment rate were studied. The results showed that the optimum condition of the making technology of the vitamin E liposomes was:temperature42°C,m(vitamin E):m(lecithin)=1:25,m(vitamin E) :m(the cholesterol )=1:3, m(vitamin E) :m(the octadecylamine )=5:1, the phosphate buffer solution was 20 ml. In this case, the entrapment efficiency of the vitamin E liposomes was 76% .This method was accurate, and applicable for the preparation of vitamin E liposomes, and the property of it was very stable.
A Stretched Carbon Nanotube with a High-Density of Topological Defect
Authors: Meng Fan Yan , Wang Gui Sheng , Shi San Qiang , Ogata Shigenobu
Published: May 2011

We have developed a theoretical method to obtain a single-walled carbon nanotube (SWCNT) with a high density of topological defects. Carbon nanotubes (CNTs) sustain elastic elongation up to 15-30% at low temperature because of the sufficiently high barrier of bond rotations. A large number of topological defects are activated simultaneously and widely distributed over the entire tube wall after heating the stretched tube to an elevated temperature. This is driven by the internal energy of the strained carbon nanotubes. The manner in which topological defects are distributed is affected by the initial strain and the heating temperature. Nanotubes with a large number of topological defects achieve the elongation without breaking.
Application of Soluble Membrane Filter in Simultaneous Determination of Trace Levels of Cadmium, Copper, Lead and Zinc in Food Additives by Inductively Coupled Plasma Atomic Emission Spectrometry
Authors: Zhu Zhen Ke , Chen Jian Guo , Jin Xian Zhong , Chen Shao Hong , Wei Dan Yi
Published: May 2011

A method for simultaneous determination of trace levels of Cd(II), Cu(II), Pb(II) and Zn(II) in food additives by inductively coupled plasma atomic emission spectrometry ( ICP–AES ) after soluble membrane filter pre-concentration was developed. Based on collection of the chelates of metal ions(II) with 2-(5-bromo-2-pyridylazo)-5- diethylaminophenol ( 5-Br-PADAP ) on soluble membrane filter, the analyte ions were pre-concentrated and separated from sample matrix solutions. Multi-channel membrane filter device and soluble mixed cellulose ester membrane were selected. Analytical parameters such as pH, amount of 5-Br-PADAP, sample volume, etc. were optimized. Under the matrix of Na+, K+ and Mg2+, the limits of detection were 0.02 – 0.03, 0.14 – 0.23, 0.31 – 0.53, 0.10 – 0.15 μg L-1 for Cd(II), Cu(II), Pb(II) and Zn(II) respectively. The developed method was successfully applied to sodium benzoate, potassium sorbate and basic magnesium carbonate with spiked recoveries of 94% – 115%. Some sample analysis results were checked by inductively coupled plasma mass spectrometry ( ICP–MS ) directly.
Crystal Structure of Acontine-4, 8, 9-Triol-19-Ethyl-1, 14, 16-Trimethoxy-4 -[2-(acetylamino)benzoate] Adulterated Copper Chloride C32H45N2O8CL2Cu
Authors: Sun Wen Xiu , Yuan Ai Ai , Zhang Cai Yan , Dong Tun Galag
Published: May 2011

C32H45N2O8Cl2Cu Monoclinic, P2/1, a = 10.665(2)Å, b = 12.4197(2)Å, c = 12.1995(3)Å, α = 90.00°, β = 90.201(1) o, γ = 90.00 o, V = 1615.96(6)Å3, Z = 2, Rgt(F) = 0.028, wRref(F2) = 0.083, T = 153K.
Characterization of Pyrolysis Liquids of Waste Wood-Based Board
Authors: Chen Shi Hua , Feng Yong Shun , Mu Jun
Published: May 2011

We mainly characterized the compositions and basic properties of pyrolysis liquids of waste wood-based board in this study which can be a basic research for a further study of the possible application of the liquids. Compositions of pyrolysis liquids of wood-based board were analyzed by gas chromatography mass spectrometry (GC-MS). Basic properties of pyrolysis liquids including moisture content, density, diopter, pH and acidity were tested in the experiment. Results from GC-MS analysis show that pyrolysis liquids were influenced a lot by the nitrogen compounds transferred from urea formaldehyde (UF). Pyrolysis liquids are weak acetic to weak alkaline influenced by the pyrolysis compounds of UF adhesive. There are also some differences in properties between the pyrolysis liquids of medium density fiberboard (MDF) and particle board (PB). Future studies should be carried out to study the specific compositions and possible application of the liquids.
Real-Time Interactive Multi-Resolution Watershed Model
Authors: Li Xiao Gen , Huang Zhi Quan , Jiang Tong , Wang An Ming
Published: May 2011

Through the researches and discussions of each constituents of multi-resolution watershed model, the article comes to the conclusion that could apply the LOD(Level of Detail, LOD) technique , the blanking technique and so on to the deletions and replaces of DEM(Digital Elevation Model, DEM) data nodes and the unimportant watershed region in the multi-resolution watershed model, the remote sensing images, the multi-resolution building model, the multi-resolution flood routing model. The method could reduce the data quantity of valley model. The experiment has proved that the multi-resolution watershed model with the applications of this method could not only express three dimensional virtual large scene of the watershed better, but also make the visualization of the mass data model in real-time interactive manner in condition of the computer capability nowadays. This achievement has provided the new thought for the compression of remote sensing images and data transmission of WebGIS in real-time interactive manner.
Antimicrobial Activity of Microencapsulated Cinnamon Oil and Its Application on Cherry Tomato
Authors: Xing Ya Ge , Li Xi Hong , Xu Qing Lian , Shao Chong Xiao , Yun Juan
Published: May 2011

In this investigation, antibacterial property of microencapsulated cinnamon oil was investigated. Microencapsulated cinnamon oil was prepared by simple coacervation. Microencapsulated cinnamon oil exhibited good antimicrobial activities.Moreover, the effect of microencapsulated cinnamon oil on the quality of cherry tomato was investigated. Result showed microencapsulated cinnamon oil could reduced fruit decay and keep the quality of cherry tomato.
Preparation and Characterization of a Novel One-Component Polyurethane
Authors: Lou Chun Hua , Gu Ji You , Di Ming Wei , Ma Li Qun , Wang Ya Zhen
Published: May 2011

A novel one-component polyurethane was synthesized by 2,4,6-trichlorophenol (TCP) as blocking agent for polymethylene polyphenyl isocyanate (PAPI). FTIR spectrum indicates that the NCO groups of the isocyanate molecule are blocked with TCP and the added catalyst should make the reaction faster than that of un-added catalyst. The one-component was characterized by1H NMR and13C NMR.
Response Surface Methodology for the Optimization of α-Amylase Production by Bacillus subtilis ZJF-1A5
Authors: Sun Jun Liang , Liang Xin Hong , Zeng Jie , Li Guang Lei , Sun Jun Liang
Published: May 2011

The aim of this work was to optimize the process parameters through the statistical approach for the production of alpha amylase by Bacillus subtilis ZJF-1A5 in submerged fermentation (SMF). The process parameters influencing the enzyme production were identified by using response surface methodology. Among the variables screened, the temperature and time were most significant and showed a positive interaction. The optimum levels were: temperature 35.8 °C, pH 5.03 and time 54h and under these conditions α-amylase yield was up to 191.15 U/mL.
Study on Synergistic Antimicrobial Effect of Origanum Vulgare L and Forsythia suspensa Essential Oils
Authors: Gu Ren Yong , Zhu Ai Hua , Zhang Li
Published: May 2011

Supercritical carbon dioxide extraction (SCDE) technique was used to extract essential oils of Origanum vulgare L and Forsythia suspensa. The minimum inhibitory concentrations (MIC) of Origanum vulgare L essential oil and Forsythia suspensa essential oil used alone and in combination were determined by the same geometric dilution method, respectively. Then the synergistic antimicrobial effect of two essential oils was evaluated according to the calculated FIC values. The results showed that in light of the criteria of fractional inhibitory concentration (FIC), the combined use of Origanum vulgare L and Forsythia suspensa essential oils had synergistic effect on three bacteria (FIC=0.2-0.4) and on two mildews (FIC=0.1), and additive effect on two yeasts (FIC=0.8).
Inducement Expression and Synthetic Dyes Decolourization Capacity of CotA
Authors: Zhang Ning , Zhao Min , Wang Chun Lei , Du Guang Ying Hui
Published: May 2011

Bacillus subtilis
cotA gene which was designed According to GenBank. cotA gene was transformed to Escherichia coli BL21(DE3). The recombined CotA protein was expressed by IPTG induced method. The CotA protein was stained red by syringaldazine after Native-PAGE.The effects of the condition of induction expression on enzyme production of recombinant Escherichia coli were investigated. The result showed that the highest enzyme activity of recombinant CotA could be achieved under the following conditions: the concentration of IPTG was 1.0 mmol L-1, IPTG was added to the culture given a final concentration of 1.0 mol L-1 when the OD600 of culture reached 1.0, induction time was 12 h at 25°C. The CotA laccases could decolorize Remazol brilliant blue R (RBBR) and Congo red with 87% and Isatin and Crystal Violet with 55%. The result indicated that the CotA laccase had the potential to be industrial enzyme.
Polymer Cement Waterproof Coating and its Properties (II)
Authors: Fu Wen , Wang Li , Huang Jun Zuo
Published: May 2011

As a new environment-friendly waterproof material, polymer cement waterproof coating combines the rigidity of cement and the flexibility of polymer materials. The ratio of the liquid powder、the ratio of the C/P、the dosage of stuffing、the coating-forming additives、the defoamer were discussed to investigate their effect on the waterproof materials’ water resistance and water proofness.
The Preparation of (E)-Resveratrol Nanoemulsion and In Vitro Release
Authors: Zhang Yue , Gao Jun Gang , Ma Dan Peng
Published: May 2011

Here a novel procedure to prepare stable (E)-resveratrol nanoemulsion is reported. The optimum (E)-resveratrol nanoemulsion formulation was sifted based on the pseudo ternary phase diagrams and particle size distribution. An optimized prescription was given as (E)-resveratrol 0.35%, EL-40 22.6%, 1,2-propylene glycol 5.03%, IPM 9.21% and water 62.81% (mass ratio), with the mean particle size 47.3 nm. The morphology of the (E)-resveratrol nanoemulsion was characterized by TEM. The test results demonstrate that the nanoemulsion could dramatically improve the stability and release of (E)-resveratrol.
Removal of Heavy Metal Ions from Aqueous Solutions by Adsorption Using Modified Orange Peel as Adsorbent
Authors: Guo Xue Yi , Liang Sha , Tian Qing Hua
Published: May 2011

In this study, orange peel (OP) was modified by KCl to prepare a novel orange peel adsorbent named as KOP. The adsorption behaviors of KOP for five heavy metals (Cu2+, Cd2+, Pb2+, Zn2+, Ni2+) were studied. The effects of pH, adsorption time and metal ion concentration on single heavy metal solution adsorption by KOP were investigated. All adsorption processes can attain equilibrium with 20min and kinetics data of five heavy metal ions were fitted to pseudo-second-equation; the maximum adsorption capacities for Cu2+, Cd2+, Pb2+, Zn2+and Ni2+were calculated as 59.77, 125.63, 141.84, 45.29 and 49.14 mg/g, respectively. Recycle and reuse experiments indicate that KOP could be used for more than 10 cycles. The effect of coexist metal ions on adsorption can be neglected.
Study of High Voltage Electric Field on the Mechanism of Horseradish Peroxidase Activity
Authors: Yang Zhi Huai , Xu Qiang
Published: May 2011

The activity of Horseradish Peroxidase (HRP) was enhanced with different strength of high voltage electric field. The results have shown that Ultraviolet-Visible spectra have been changed obviously. Experimental results indicate that the conformation of HRP can be changed by electric field. The study also showed that the activity index of HRP was increased by the certain strength of electric field. The activity index increase possibly was caused by the conformation variations of HRP. The result of this study has important meaning to explain the macroscopical electrostatic biological effects.
Spectroscopic Studies on the Interaction between Salvianolic Acid a and Human Serum Albumin
Authors: Zhang Ting , Liu Quan Wen , Li Gui Hua
Published: May 2011

The interaction between human serum albumin (HSA) and salvianolic acid A (SA-A) was investigated by means of spectroscopy. The thermodynamic parametersΔHandΔS, had been calculated to be 148.94KJ·mol-1> 0, and 640.85 J·mol-1·K-1> 0, respectively. The distance between the donor (HSA) and receptor (SA-A),r, was obtained to be 2.49nm according to Förster's non-radiative energy transfer theory. The experimental results revealed that SA-A could quench the fluorescence of HSA by a static quenching mechanism. Furthermore, the binding constants between HSA and SA-A were obviously affected by metal ions, decreased in the presence of Co(Ⅱ) and Mg(Ⅱ), increased with Ni(Ⅱ) and Zn(Ⅱ), and no change with Cu(Ⅱ). The interaction between SA-A and HSA was driven mainly by hydrophobic force.
Mathematical Treatment and Model Development of the Solvent Effect in Curcumin Extraction Kinetics
Authors: Cao Yan Ping , Wang Jing , Xiao Jun Song , Wang Cheng Tao
Published: May 2011

The batch extraction kinetics equation based on Fick’s law was obtained by a direct dimensionless modification with the extraction capacity factor (f1). f1 integrates the penetrating and dissolving capacity of the extraction solvent and its effect on the plant tissue. The effect of ethanol content (45%–75%, V/V) on the batch extraction of curcumin from turmeric (Curcurna longa L.) was evaluated for 3.69 mm turmeric particles at 65 °C, 80:1 liquid/material ratio, without stirring. Based on the results, and considering ethanol’s dielectric constant, surface tension, viscosity and effects on the turmeric tissue, the batch extraction kinetics equation was established using the variable separation method. The model calculations matched well with the experimental data obtained. In addition, the mechanism of ethanol’s effect on the extraction of curcumin from turmeric was also investigated.
Polymer Cement Waterproof Coating and its Properties(I)
Authors: Fu Wen , Wang Li , Huang Jun Zuo
Published: May 2011

As a new environment-friendly waterproof material, polymer cement waterproof coating combines the rigidity of cement and the flexibility of polymer materials. The ratio of the L/P、the ratio of the C/P, the dosage of dispersant were discussed to investigate their effect on the coatings’ flexibility at low-temperature and the bond strength of wet surface.
FEM Simulation of Elastic Properties of Closed-Cell Starch Extrudate with Spherical Pores
Authors: Fan Xiao Ping , Xu Wei , Zhou Jia Hua , Xiang Hong
Published: May 2011

Three types of single closed cell model, single-centered cubic, face-centered cubic and body-centered cubic were set up based on the geometric character of corn starch extrudate. The elastic moduli were simulated with finite elements method (FEM). Fitting equation for elasticity modulus and relative density calculated from each type of cell model was developed and validated with that calculated from Ashby-Gibson equation. The accuracy of results from finite elements analysis was comparable to that of Ashby-Gibson equation.
Optimization of Alcoholic Fermentation from Apple Juice by ACA-Immobilized Saccharomyces cerevisiae Cells
Authors: Zhang Hua Wei , Bai Xue Lian
Published: May 2011

This work focused on optimization of ethanol fermentation of yeast cells immobilized by calcium alginate-chitosan (ACA) using orthogonal experiments. Alcoholicity of original cider was used as an evaluating indicator. The single factor tests indicated that fermentation factors, starting sugar content, inoculating quantity of yeast, initial pH and fermentation temperature, had different effect on ethanol yield. L9(34) orthogonal tests showed that the optimal conditions of cider fermentation were as followed: inoculating quantity (percentage of amount of ACA-yeast biocatalyst to volume of apple juice, g/mL) 4%, starting sugar content 20 °Bx, fermentation temperature 26 °C, initial pH 2.5. The verification experiments suggested the alcoholicity of original cider reached 10.9% under the optimal conditions.
Analysis of Starch Bubble Breakage during Extrusion Expansion by Finite Elements Method
Authors: Fan Xiao Ping , Meng Zhi Feng , Zhou Jia Hua , Xiang Hong
Published: May 2011

Major factors that influenced the breakage of starch bubbles during extrusion expansion such as the initial bubble radium, the initial cell wall thickness, the initial cell wall temperature, the initial cell wall moisture content, the stress strength constant of starch and the changes of failure stress of bubble wall, stress of bubble wall, bubble radium, cell wall thickness, pressure different with time were investigated and the critical breaking points for each operation parameters under certain conditions were determined. The results showed that the smaller the initial bubble radium, the higher the initial cell wall thickness, and within certain range, the lower the initial temperature, the lower the initial moisture content, and the higher the stress strength constant of starch, the lower the tendency the bubble broke.
Isolation and Identification of a Mold Strain Producing Esterifying Synthetase and Study on its Metabolies
Authors: Huang Dan , Chu Yu Long , Shang Zhi Chao , Li Yu Long , Lu Zhong Ming
Published: May 2011

The metabolies characterization of mold producing esterifying synthetase of different culture conditions were studied. A mold strain producing esterifying enzyme was isolated from Luzhou-flavor DaQu and it was identified by Biolog Microbes automated identification System. Culture conditions such as culture temperature, fermentation time and carbon source were changed. The fermentatiom broth was extracted by ethanol and analyzed by GC-MS. The results showed that the strain was Aspergillus flavus. When the culture temperature increased, the molecular weight of its metabolites increased, the synthesis of high alcohol increased too, and their carbon chain lengthened gradually. When incubation time was prolonged, the varying law of the synthesis of its metabolites was alcohols-acid-ester, the metabolites with longer carbon chain produced earlier than the metabolites with shorter carbon chain. When the carbon source were starch, sucrose and bran, n-butyl alcohol and isoamyl alcohol were the common metabolites. When the carbon source was sucrose, most of the metabolites were alcohol and acid with shorter carbon chain. When the carbon source was starch, diethyl succinate was produced. When the carbon source was bran, the metabolites were less.
Progress in Enzymatic Membrane Bioreactor: A Review of Research Methodology and Reaction Characteristic
Authors: Xia Ming , Ying Tie Jing
Published: May 2011

The enzymatic membrane bioreactor (EMB), which is a combination of a membrane separation process and an enzymatic reaction, is increasingly applied in food and agriculture fields. This article reviews the previous literatures of this topic, and particularly focuses on mathemaitc models which simulate the EMB system behavior and factors restricting EMB performances. The article consists of three parts. The first sector discusses mathematic models of EMB which are mostly derived from Michaelis-Menten equation, Fick’s diffusion law, chemical equilibrium and material balance, and affecting factors whose interactions are revealed by response surface methodology, in order to optimize the parameters of EMB. The second section summarizes the reaction characters of EMB. Finally, the future research areas of EMB are proposed.
A Novel Processing Technique for the Production of Instant Rice Noodle with a Long Shelf-Life
Authors: Xie Ding , Liu Yong Le , Ouyan Jian Xun , Li Xiao Wen , Wei Yu Cui , Yu Jian , Li Chi Ling , Wang Fa Xiang
Published: May 2011

Using additives to prevent retrogradation together with traditional Chinese fermentation technology for rice noodles and the steam sterilizing technique used in the preparation of Japanesewudonoodles, we have developed a novel processing technique which will be discussed in this report. The major changes in rice compositions during fermentation were compared, and the effects of various anti-retrogradation additives on the freshness of instant rice noodle during storage were also measured. The results showed that rice noodles produced by fermentation have a better texture and flavor than those which are not fermented; products which have been wrapped without the addition of any preservatives but which have been steam-sterilized at 90-95 °C for 30-25 min can be stored for 24 months without any deterioration; however, additives such as plant oil, konjac powder and potato starch etc. prevent retrogradation and insure that instant rice noodles remain fresh during storage; β-amylase has been found to be the most effective reagent in this respect.
Fixed Speed Release System: Huperzine a Loaded Microspheres in Thermosensitive Methylcellulose Based Hydrogel
Authors: Sun Rui , Chen Si Hao , Xing Chen Chen
Published: May 2011

Huperzine A loaded microspheres are prepared using a W/O solvent evaporation method. The fixed speed release system is that microspheres composed with thermosensitive methylcellulose based hydrogel. SEM is used to analysis the surface morphology of Huperzine A loaded microspheres, which is shown that the difference of the size of microspheres. The size less than 200µm can be used as injection. Gelation experiment shows that the methylcellulose based solution can be transformed into in-situ hydrogel in 15 minutes at body temperature. The result of in vitro release shows that Huperzine A released in a nearly fixed speed. All the meterials of experiment can be biodegrated completely without operating to remove the gel. This is a promising long-term injection system, which is security and controlable for clinic.
Characteristics of Piperine Solubility in Multiple Solvent
Authors: Huang Xue Song , Lin Xian Zhe , Guo Mo Ting , Zou Ya
Published: May 2011

The solution of piperine in multiple solvent including ethanol, acetic acid, water and HCl were investigated to extract more piperine from piper fruit. Piperine was determined by reverse phase high-performance liquid chromatography with Diamonsil column (C18,5 μm ,250 mm×4. 6 mm) at 343 nm. Experiment data were simulated by Allometric model and the formula is Z=0.9+ 4.54×10-10×x5.675+1.8029×y2.12848+2.37×10-10×x5.675×y2.12848(Z:sample solution,mol/mL,x: the percentage of ethanol’s volume, ml/100mL,y: the acetic acid in the authentic sample solution, g/100mL), the adj·R2=0.997, the comparative deviation less than 2%. These results are good in agreement with experimental data. It reveals that the model can meet the requirements of the selection and design in extracting piperine from piper fruit.
Research on Extraction of Proanthocyanidin from Peanut Skin by Aspergillus niger Fermentation
Authors: Zhang Chu Shu , Yang Qing Li , Jia Ke , Liu Zhi Qiang , Yu Li Na , Sun Jie , Bi Jie
Published: May 2011

The cell wall of peanut skin was destroyed by cellulase enzymolysis from peanut skin fermentation, which was beneficial to extract proanthocyanidin. The extraction conditions of proanthocyanidin from fermented peanut skin were studied according to orthogonal experiment based on single factor experiments. And the optimum conditions were obtained as follows: extraction time 40min, extraction temperature 55°C, Concentrations of ethanol 45%, solid-liquid ratio 1:15. The extraction rate was 16.17 %.
Study on the Adsorption of Mixed Cd(II) and Pb(II) Ions by N,O-Carboxymethyl-Chitosan
Authors: Cheng Shan Shan , Zhang Chao Hua , Yang Xi Hong , Xie Wan Cui
Published: May 2011

TheN,O-carboxymethyl-chitosan (N,O-CMC) was used to investigate the adsorptions of two metals of Cd(Ⅱ) and Pb(Ⅱ) ions in an mixed aqueous solution. The effects on adsorption capacities such as pH value, temperature, adsorbent dose and initial metal ion concentrations were investigated, and the dialysis method was applied to separate the materials after adsorption. The results revealed that the better adsorption ofN,O-CMC for Cd(Ⅱ) and Pb(Ⅱ) ions at the pH 7-8; the effect of temperature on the adsorption was not significant; the absorption of Cd(Ⅱ) and Pb(Ⅱ) ions was enhanced with the increase ofN,O-CMC amount; the adsorption capacity increasesed with the addition of the concentration of initial metal ions in the aqueous phase. The adsorption of Pb(Ⅱ) ion in Cd-Pb mixed solution on theN,O-CMC was well followed as the Langmuir isotherm equation under the concentration range studied, and Cd(Ⅱ) ion was corresponding to Langmuir adsorption equation in 100-200 mg/L and 200-500 mg/L, respectively. Conclusion:N,O-CMC was suitable for adsorbent to removal Cd(Ⅱ) and Pb(Ⅱ) ions, but it can selectively adsorption ions from the mixed solution, the adsorption capacity (Qm) for two metal ions was as follows: Pb(Ⅱ) > Cd(Ⅱ).
Effect of Different Maceration Levels on the Antioxidant and Bioavailability of Wine from Vitis vinifera Cv. Muscat Hamburg
Authors: Zhou Yan Wen , Tang Yao , Li Xi Hong , Li Wei Li , Xue Ting , Yun Juan
Published: May 2011

The paper studied the effect of different maceration levels on the antioxidant and bioavailability of wine from vitis vinifera cv. Muscat Hamburg in China. The bioavailability of phenolic fraction was assayed for Folin-Ciocalteu Reaction (FCR) reducing capacity, and methanol content was determined with Gas Chromatography. All maceration treatments raised wine polyphenolic content and antioxidant while increased the methanol, too. Evaluated by an in vitro digestion process, the bioavailability of polyphenolic compounds and methanol in wine showed that the FCR value of the full-maceration samples was the highest (31.56%), the methanol content of the samples was higher than that of other three groups (29.60%), and the availability was up to its maximum absorptivity (53.07%). It suggests that the Muscat red wine may represent higher quality and bioavailability after extended maceration.
Screening and Desilication of a Silicate Bacteria
Authors: Zhang Xian Zhen , Sun De Si , Lin Hai
Published: May 2011

The strain Jgj-1 was isolated from Gaoan bauxite ore. The relations of desilication of the strain Jgj-1 and the pH of solution, temperature, shaking speed, incubation time, particle size were investigated. The results shows the optimum conditions of bioleaching are as following: at 28°C, initial pH value is 7.2, particle size 0.056mm, 200rpm shaking speed, incubation 5-7 days.
Recovery Leaching of Niobium from Metallurgical Residues
Authors: Dai Yan Yang , Zhong Zhui , Zhong Hai Yun
Published: May 2011

Niobium was recovered by acid-alkaline leaching from metallurgial residues. The experimental results indicate that effects of different leaching system and leaching conditions on the Nb recovery were different. Separation of niobium and impurities such as iron, manganese, calcium and silicon is essential for Nb recovery. Acid leaching distributed metals between the solid and solution. While about 98%Nb remains in the leached mud when alkaline sintering–leaching processed. According to the investigation of comprehensive process of acid-base, tungsten residue was leached with a double excess of 15%HCl at 60°C for 90mins,and leached mud was mixed with soda as W(soda)/W(residue) =0.37，then Sintered at 850°C for 90mins，gained concentrated material with 2.74%Nb2O5after leaching at 95°C for 60mins. 86.8%Nb remain in the mud. Product containing 15.8% Nb2O5was gained via decomposition by HF+H2SO4system and solvent extraction with MIBK. Wasted residue from alkali leaching of tin metallurgical slag were deal with the same conditions and concentrate containing 17.02% Nb2O5was gained.
Adsorption Behavior of L-Histidine on a Novel Spherical Chitosan Adsorbent
Authors: Liu Ming Hua , Huang Piao Piao , Ou Jian Yun
Published: May 2011

The spherical chitosan adsorbent was prepared by graft copolymerization of acrylic acid onto the cross-linked spherical chitosan beads, and then was adopted to adsorb the L-histidine. The adsorption conditions, i.e., solution pH, adsorption time, initial concentration and adsorption temperature were optimized. The spherical chitosan adsorbent showed excellent equilibrium adsorption capacity of 78.3 mg/g for the L-histidine when the solution pH value was 7.5, adsorption time was 180 min, initial concentration was 1500 mg/L and the adsorption temperature was 25 °C. Moreover, the inorganic salt of NaCl also showed great effect on the equilibrium adsorption capacity exceeding 0.8 mol/L. The static adsorption processes followed the Langmuir adsorption isothermal equation and Freundlich adsorption isothermal equation. Furthermore, L-histidine could be desorbed with 1.5 mol/L of ammonia solution, and the regeneration capacity of the spherical chitosan adsorbent was excellent.
Response Surface Optimization of Concentrated Sulfuric Acidic Hydrolysis of Poplar Sawdust
Authors: Liu Shan Shan , Fang Gui Gan , Deng Yong Jun , Han Shan Ming
Published: May 2011

The primary goal of this study was optimized condition for hydrolyzed of papermaking waste (poplar sawdust) as a potential bio-ethanol source by sulfuric acid pretreatment. Based on 23factorial design, fifteen operations were performed by varying on T, t and c (T: hydrolysis temperature, t: hydrolysis time and c: sulfuric acid concentration). The components of the hydrolysate and solid fractions were analyzed by GC, X-RD and SEM, respectively. The results showed that optimal condition was T 44.8°C, t 120min and c 60%, and reducing sugar yield of 43.3% can be obtained. Through GC detection, glucose content of 26.10 g/L and xylose content of 9.00 g/L is available in hydrolyzate for fermentation. The residue crystallinity declined 74.34% from XRD analysis, the fiber structure was destroyed completely by acid hydrolysis from SEM photograph.
Study on Antibacterial Substances Extraxted from Natto
Authors: Li Xiu Juan , Ye Chen , Liu Qing Dai
Published: May 2011

Antibacterial Substances were extracted and purified with trichloroacetic acid-acetone precipitant method and ammonium sulphate, respectively. The region of molecular weight of the extracts was analyzed by SDS-PAGE. The antibacterial experiment was carried out, and the results showed that the 50-100KD of the extractions had stronger antibacterial activities againstEscherichia coli,Salmonella typhimuriumandStaphylococcus aureus.
Investigation on Material under Accelerated Simulator Environment in Laboratory and Tropical Marine Environment of Aircraft Structure
Authors: Chen Yue Liang , Hu Jian Jun , Bian Gui Xue , Zhang Yong , Luo Hao
Published: May 2011

The important factors induced corrosion damage of aircraft are analyzed. Based on airport ground environment spectrum, the LY12CZ specimens are tested in laboratory using the accelerated corrosion spectrum. Some specimens are exposed on deck in tropical marine environment. The corrosion characteristic of the coating and base material is inspected and corrosion damage size is measured after the specimens have been accelerated corrosion tested for 5,10,15,20 and 30 years respectively and the specimens have been exposed on deck. The corrosion characteristic of specimens are analyzed and compared using several evaluating indicator. The results show that the corrosion damage characteristic of the specimen in the test is consistent with which in service situations. And the corrosion of material exposed in ocean environment is obviously accelerated. The corrosion depth is measured and the mass loss by corrosion is weighed. The distribution function of the corrosion depth and the characteristic of the mass loss by corrosion are given. The corrosion equivalent relationship under these two environments is determined by contrasting the corrosion depth and the corrosion characteristic.
Synthesis and Application of Poly-Allyl-Imidazolium Ionic Liquid Stationary Phase in Capillary Gas Chromatography
Authors: Zhang Lin Xia , Liu Tao , Chen Zhen He , Sun Li Quan , Luo Ai Qin
Published: May 2011

Two 1-allyl-3-butylimidazolium ionic liquids were synthesized and polymerized in- column as stationary phases in capillary gas chromatography. The influences of different counter ions (hexafluorophosphate, tetrafluoroborate) were studied. The results indicated that 1-allyl-3-butyl- imidazolium ionic liquids possessed good column coating properties and chromatographic separation abilities after polymerized in-column. The Grobs mixture, alcohols and alkanes and aromatic position isomers, such as xylene, nitrotoluene, dichlorobenzene and cresol were separated well. These polymeric ionic liquids gave potential to separate some complex compounds including alcohol, amine, ester etc.
Biomass Gasification and its Applications at Home
Authors: Guo Ying Ying , Liu Yang Sheng
Published: May 2011

Bioenergy is a renewable energy with such advantages as low cost, simple construction, and it is also quite economic and effective. The bioenergy application directly displaces greenhouse gas emissions and does not contaminate environment. Based on these characteristics, biomass as a source of bioenergy has been attracting much more concern in recent years. This paper aims to introduce mechanism of biomass gasification, types of gasifiers, applications and research progress at home.
Numerical Simulation of Instantaneous Flashing LPG Release
Authors: Liu Xiao , Tan Wei , Bu Yu , Liu Yu Jin , Wang Ze Jun
Published: May 2011

An accident instantaneous release of LPG can results in a rapidly expanding two-phase flammable cloud, which is the medium of potentially disastrous consequences. In this paper, CFD (Computational Fluid Dynamics) method was applied for instantaneous LPG release in an open environment in order to analysis the expansion process of two-phase cloud. The results from simulation are compared with the published experimental data to validate the model. Statistical analysis of experimental data is used to set the initial conditions and computational inlet in the model. The mass and heat transfer is calculated in eulerian-lagrangian method. The features in expansion process are studied by the analyses of the variation of size, temperature, volume averaged rate of evaporation of the cloud and entropy of the whole flow field.
Preparation and Controlled Release Analysis of Patchouli Oil Complex Microcapsules
Authors: Hu Yang , Yang Zi Ming , Liu Jia Yi , Cheng Jian Hua , Yang Zhuo Hong
Published: May 2011

In this paper, the patchouli oil complex microcapsules were prepared by complex coacervation method, with chitosan (CTS), quaternary ammonium salt of chitosan (HACC) and gum arabic (GA) as the wall materials, patchouli oil as the core materials. The surface morphology of microcapsules was characterized by scanning electron microscopy (SEM).The in vitro release property of patchouli oil from microcapsules was measured by UV–visible spectrophotometer. The results showed that the shapes of microcapsules were spherical, and the diameters of microcapsules were mostly 3-9 μm. The entrapment efficiency and drug loading of microcapsules were 60.6%and 20.2% respectively. The release effect of microcapsules could be influenced by the temperature of the release medium.
The Crystal Behaviors of Shortenings Made from Lard and Palm Oil
Authors: Wu Su Xi , Liu Rui Xin , Li Hui , Ji Min
Published: May 2011

The crystal behaviors of lard- based and palm oil-based shortenings manufactured under different crystallization conditions were studied and compared, by using X-ray diffraction method, in order to decide whether lard can be replaced with cheaper palm oil for the production of shortening. The results showed that lard-based shortenings all exhibited β-type of crystal structure under tested crystallization conditions, whereas those shortenings based on the palm oil or the blend of palm stearin with palm olein presented β-type crystals under the maturation temperature of 20°C and β’-type crystals under the maturation temperature of 25°C～28°C. This study demonstrated that lard-based shorternings do not have β’-type crystal structure, a key character for the production of high quality shortening, and palm oil (including palm stearin and palm olein) is more suitable than lard when used as a solid fat material for the manufacture of shortenings.
Study on Durability of Engineered Cementitious Composites
Authors: Xue Hui Qing , Deng Zong Cai
Published: May 2011

Engineered cementitious composites (ECC) has good ductility, with its unique strain hardening and multiple cracking characteristics. Through the research of uniaxial direct tension performance and durability tests of ECC blending with polyvinyl alcohol (PVA) fiber, the tensile stress-strain curves, the freeze-thaw resistances and the impermeability of ECC were analyzed. The tensile stress - strain curve results show strain hardening of ECC achieved under the uniaxial tensile load; PVA fiber has good crack resistance toughening effect, can significantly improve crack resistance and deformation capacity of cementitious composites. The maximum tensile strain of the ECC is between 3800με to 8657με (20-50 times that of polypropylene fiber concrete) displays high toughness and large deformation characteristics. The freezing level of the ECC is higher than F300, which is ideal for the maintenance and reinforcement of concrete structures in cold regions. Domestic and imported PVA fiber can significantly improve the impermeability and crack resistance of the ECC.
Purification of Hulless Barley Anthocyanins with Macroporous Resins
Authors: Zhao Tao , Ma Lin , Du Jing Jun , Zhang Liang , Wu Xiao Yan
Published: May 2011

The purification effects of six macroporous adsorption resins on total anthocyanins of hulless barley were compared. The results showed that XAD7HP was the best resin for purification of hulless barley anthocyanins due to its excellent adsorption and desorption capability. The optimal technological parameters were: the pH of sample solution was 3.0, the concentration of sample solution was 21.6 mg/L, the adsorption flow velocity was 1.0 mL/min, the eluting velocity is 1.0 mL/min, and the eluent was about 6.6 bed volumes of 80% ethanol. Reutilization test showed that the XAD7HP resin could be used repeatedly with no significant change of adsorption rate (P>0.05). After purified with XAD7HP, the color value of hulless barley anthocyanins was 41.1, increasing 9.1 times than that of raw extraction.
Material Basis of Germination of Salvia miltiorrhiza Bge Seeds
Authors: Zhang Yan Ping , Zhou Hui Yun , Jiang Ling Juan , Wang Zhong Dong
Published: May 2011

This study was carried out to find material basis of which effect germination rate ofSalvia miltiorrhizaBge seeds in different years and in different areas. The results can be used in quality identification and advising storage conditions. Routine method were used to study the basic qualities, such as physical purity, weight of 100 seeds, seed moisture and germination. GC-MS were used to detect fatty acids and UV spectrophotometer was used to detect reducing sugar. The germination and viability of new seeds were much higher than that of aged. Weight of 100 seeds, seed moisture, fatty acids of same origin new seeds were higher than that of aged. However there was no correlation between different areas. Content of reducing sugar of same origin new seeds were higher than that of aged, also there were no correlation between different areas. Unsaturated fatty acids content of the new seeds was 80.90% which was much higher than that of aged. Linoleic acid was the main Unsaturated fatty acids. Saturated fatty acid content was 19.10% which was much lower than that of aged. Palmitic acid was the main saturated fatty acids. Data showed that unsaturated acids were auto oxidized to saturated acids in the process of storage. Germination rate was decreased as storage time prolonged.
Study and Utilization of Heat Pump Air Condition System in Oil-Gas Gathering and Transferring
Authors: Jia Yong Ying , Zhang Lei
Published: May 2011

According to the rich heat resources of sewage waste in gathering and transferring of oil-gas of Liaohe Oil Field and the supply water temperature in the heater is over 70°C in the building, proposed the idea of using heat pump air conditioning system that the high temperature source can be used in Liaohe Oil Field sewage-source; gave the design scheme, analyzed and evaluated of its energy usage. The evaluation results indicate that heat pump is feasible and has great energy-saving and environmental benefits great.
Proton Exchange Membrane Fuel Cell(PEMFC) Heat Transfer Model and Dynamic Heat Response Analysis
Authors: Jia Qiu Hong , Han Ming , Cham Yew Thean , Deng Bin , Xiao Yan
Published: May 2011

A heat transfer model of PEMFC is developed that captures dynamic behavior for control purposes in this paper. According to the law of conservation of energy, by analyzing in detail the heat source, considering the heat of electrochemistry, activation polarization heat and the heat loss of air forced convection etc., the dynamic heat model of PEMFC is established. Among all influential factors of fuel cell temperature, current density is one of the most important influence factors. Finally, by comparing the response results temperature with the current density changes between simulation and experiments, the results s are consistent. The model in this article has an important guiding significance for the design of fuel cell. For example, the working temperature of fuel cell can keep up stability by controlling cooling medium flow rate etc.
Studies on the Logistics Optimization of Flywheel Workshop
Authors: Jia Qiu Hong , Xiao Yan , Cheng Yun Kang , Yang Yan Ru , Li Xiao Man
Published: May 2011

Current logistics status of a company’s flywheel workshop has been analyzed, according to such main principles of enterprise logistics optimization as avoid roundabout and backflow of materials, minimum distance, manpower saving, using gravity, systematization and so on, it optimizes logistics of the workshop. Comparing the data of optimization before and after, it is obvious that the process routes have been improved, logistics is smooth, transportation distance has been reduced, production cycle is shorter, production efficiency of the workshop has been greatly improved and it achieved distinct improvement.