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羟乙基纤维素的开发前景 被引量:11
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作者 孙华林 《精细石油化工》 CAS CSCD 北大核心 2002年第2期61-62,共2页
介绍了羟乙基纤维素的一般性质、应用和生产方法及国内外生产情况 ,并对市场需求做了预测。
关键词 羟乙基纤维素 开发前景 生产方 市场预测 气相 浓相法
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Review of gas-solid two phase flow rate-concentration detection technology 被引量:1
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作者 刘秀 刘吉 +2 位作者 张静 颜兵 史璐璐 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2016年第2期185-192,共8页
The indirect detection method basic principle of rate and concentration,application range and research results on gassolid two phase flow were discussed.The present development situation and the existing problems of r... The indirect detection method basic principle of rate and concentration,application range and research results on gassolid two phase flow were discussed.The present development situation and the existing problems of rate and concentration detection technology were analyzed and summarized.Emphatically analyzed the existing problems in the industrial application and research status of electrostatic method in measuring phase concentration.Design criterion of electrostatic phase concentration sensor is given,the superiority and wide industrial application prospect of the sensor used for phase concentration measurement are clarified. 展开更多
关键词 gas-solid two phase flow rate-concentration electrostatic method
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Research on the rheological properties of pesticide suspension concentrate 被引量:2
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作者 潭成侠 沈德隆 +3 位作者 翁建全 陈庆悟 刘会君 袁其亮 《Journal of Zhejiang University Science》 EI CSCD 2004年第12期1604-1607,共4页
This study reports research on pesticide suspension rheology and a new rheological parameter, the relative value of approach, which has great advantage for judging the physical stability of a pesticide suspension conc... This study reports research on pesticide suspension rheology and a new rheological parameter, the relative value of approach, which has great advantage for judging the physical stability of a pesticide suspension concentrate. Experiments showed that the system can form stable dispersions when the value of the relative value of approach (Sr) is less than 0.1. 展开更多
关键词 Suspension concentrate RHEOLOGY STABILITY Relative value of approach
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Effects of temperature and phosphoric acid addition on the solubility of iron phosphate dihydrate in aqueous solutions 被引量:5
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作者 Tongbao Zhang Yangcheng Lu Guangsheng Luo 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第2期211-215,共5页
As important controlling factors for the synthesis of iron phosphate materials by liquid-phase precipitation, the solubilities of iron phosphate dihydrate were systematically measured at H3PO4 concentrations from 1.13... As important controlling factors for the synthesis of iron phosphate materials by liquid-phase precipitation, the solubilities of iron phosphate dihydrate were systematically measured at H3PO4 concentrations from 1.13 wt% to 10.7 wt% temperature from 298.15 to 363.15 K, and atmosphere pressure in this work. The solubility was found to increase 5 orders of magnitude or more with increasing the concentration of phosphoric acid, and de- crease 1 to 2 orders of magnitude with increasing the equilibrium temperature. The phosphoric acid addition and temperature were found to affect the solubility of iron phosphate dihydrate by the formation or dissociation of coordination species, which could further accelerate the phase transformation from the amorphous iron phosphate dihydrate to orthorhombic iron phosphate dehydrate by dissolution-recrystallization mechanism. The high dependences of the solubility of iron phosphate materials on HsPO4 concentration and temperature were also well predicted by calibration equations, which are meaningful for quantitatively understanding the precipitation process and sequential crystalline structure transformation and pursuing a rational strategy for syn- thesizing specific iron phosphate materials. 展开更多
关键词 Iron phosphateSolubilityAqueous solutionPhosphoric acidTemperature
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Determination of Rhodamine B in Food Using HPLCUV Method 被引量:2
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作者 WANG Yong WU Na 《Chinese Food Science》 2012年第2期37-39,共3页
[ Objective] The aim was to establish a method for the determination of Rhodamine B in food by HPLC-UV. [ Metkod] Rhodamine B was extracted with acetone/hexane from food samples. After concentrated and purified by alu... [ Objective] The aim was to establish a method for the determination of Rhodamine B in food by HPLC-UV. [ Metkod] Rhodamine B was extracted with acetone/hexane from food samples. After concentrated and purified by alumina cartridge, the Rhodamine B content in the food was determined by using high performance liquid chromatography with ultraviolet visible detector. [ Result] Within tile concentration range of 0.005 - 2.000 mg/kg, the peak area of Rhodamine B presented good linear relation with the concentration, and the related coefficient was 0.999 98. With high average recovery rate, the detection limit of the method was 0.005 mg/kg[ Concision] It is a fast and accurate method with high sensitivity to detect Rhodamine B in food. 展开更多
关键词 FOOD HPLC-UV Rhodamine B DETECTION China
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Self-organized layered growth phenomena of diffusion couples with spinodal decomposition in binary alloys
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作者 Yong LU Yuan-yuan CUI +4 位作者 Qiao-qiao TANG Cui-ping WANG Zhen-bang WEI Shui-yuan YANG Xing-jun LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第2期349-357,共9页
In order to investigate the formation mechanisms of the layered growth phenomena in diffusion couples with spinodal decomposition,a phase field model combined with elastic strain field was employed.Microstructure evol... In order to investigate the formation mechanisms of the layered growth phenomena in diffusion couples with spinodal decomposition,a phase field model combined with elastic strain field was employed.Microstructure evolutions of diffusion couple with spinodal decomposition in binary alloys were numerically simulated by considering concentration fluctuation and elastic anisotropy.The simulation results indicate that the number of the periodical layers decreases with the increase of initial concentration fluctuation,even with large elastic anisotropy.The growth of layered microstructures can be attributed to the directional diffusion enhanced by initially discontinuous chemical potential at the interface. 展开更多
关键词 spinodal decomposition concentration fluctuation phase field method layered structure diffusion couple
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Persistence of malachite green and leucomalachite green in perch (Lateolabrax japonicus) 被引量:1
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作者 谭志军 邢丽红 +4 位作者 郭萌萌 王洪艳 江艳华 李兆新 翟毓秀 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2011年第3期647-655,共9页
The persistence of malachite green (MG), and its metabolite leucomalachite green (LMG), in fish tissues is still unclear, leading to many trade disputes. In this research, we established and evaluated an HPLC method t... The persistence of malachite green (MG), and its metabolite leucomalachite green (LMG), in fish tissues is still unclear, leading to many trade disputes. In this research, we established and evaluated an HPLC method that could detect MG and LMG simultaneously, and then investigated the persistence of these two toxins in the tissues of juvenile perch (Lateolabrax japonicus) post sub-chronic MG exposure at 1.0 mg/L. Exposure lasted for 2 h everyday and was repeated six times. The perch were then placed in MG-free seawater for 100 d to eliminate the toxins. Results show that MG accumulated in the tissues, including the gills, liver, muscle, blood and viscera, and then was metabolized rapidly to LMG. The concentrations of these two toxins increased significantly with the accumulation process. In general, the highest concentrations of MG and LMG in all tissue exceeded 1 000 μg/kg, except for MG in the muscle. The order of accumulation levels (highest to lowest) of MG was gill>blood>liver>viscera>muscle, while that of LMG was liver>blood>gill>viscera>muscle. High levels of MG or LMG could persist for several hours but decreased rapidly during the elimination process. The concentration of LMG was much higher than that of MG during the experiment, especially in the gill, liver and blood. Therefore, the three tissues play important roles in toxin accumulation, biotransformation, and elimination. Although the MG and LMG concentrations in muscle were much lower than in other tissues, the content still exceeded the European minimum required performance limit (MRPL), even after 2 400 h (100 d) of elimination. This demonstrates that it is extremely difficult to eliminate MG and LMG from tissues of perch, and therefore use of these toxins is of concern to public health. 展开更多
关键词 PERSISTENCE RESIDUES malachite green leucomalachite green PERCH
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Lack of Gender Effect on the Pharmacokinetics of Oxytetracycline in Fenneropenaeus chinensis After Intramuscular Administration
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作者 SUN Ming LI Jian +3 位作者 CHANG Zhiqiang GUO Wenting ZHAO Fazhen LI Jitao 《Journal of Ocean University of China》 SCIE CAS 2015年第2期335-339,共5页
Fenneropenaeus chinensis, an economically important shrimp species, currently suffers from epizootic diseases due to high density stocking and bacterial infections. Oxytetracycline (OTC) has been widely used to trea... Fenneropenaeus chinensis, an economically important shrimp species, currently suffers from epizootic diseases due to high density stocking and bacterial infections. Oxytetracycline (OTC) has been widely used to treat various systemic bacterial infec- tions in shrimp farming. In the present study, the effect of gender on pharmacokinetics of OTC in F. chinensis was investigated. The OTC concentrations in hemolymph of shrimp after single intramuscular administration (75 mg OTC per kg body weight) were ana- lyzed by high performance liquid chromatography and best described with a two-compartment open model which is characterized by a short elimination half-life, low clearance, and a relatively large apparent volume of distribution. The pharmacokinetic equations were Ct= 58.54e-0.38t+ 11.67e-0.04t for females; and Ct= 27.94e-0.28t+ 14.87e-0.04t for males. The distribution and elimination half-lives of OTC were 1.82 and 19.58 h, respectively, in females and 2.50 and 16.11 h, respectively, in males at 22 ℃. The areas under the drug concentration curve were 480 mg L-1 h-1 in females and 430 mg L-1 h-1 in males. The total body clearance of the drug was 157.11 mL kg-1 h-l in females and 172.47mLkg-1 h-1 in males. The apparent volume distribution was 4.44 in females and 4.01 Lkg-1 in males. There was no significant difference in pharmacokinetic parameters between female and male shrimps, indicating that there is no need to consider the gender effect in clinical use of OTC in F. chinensis farming. 展开更多
关键词 Fenneropenaeus chinensis OXYTETRACYCLINE PHARMACOKINETICS GENDER
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Kinetics of water–isocyanate reaction in N,N-dimethylformamide 被引量:1
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作者 Zhirong Chen Weitao Yang +1 位作者 Hong Yin Shenfeng Yuan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第10期1435-1441,共7页
The uncatalyzed reaction of p-tolyl isocyanate(p-TI)with water in N,N-dimethylformamide(DMF)was investigated by high performance liquid chromatography(HPLC).The reactions were carried out at different temperatures fro... The uncatalyzed reaction of p-tolyl isocyanate(p-TI)with water in N,N-dimethylformamide(DMF)was investigated by high performance liquid chromatography(HPLC).The reactions were carried out at different temperatures from 293 K to 323 K,using various molar ratios of water to p-TI.DMF,as a special amide,was proved to be an efficient catalyst for water–isocyanate reaction.Under the reaction conditions in this study,substituted urea was the only final product observed.An appreciable amount of intermediate p-toluidine was detected.Concentrations of the isocyanate group as well as the amine and urea were determined as a function of time.New kinetic equations were deduced for each of the substance on the basis of a multistep mechanism,instead of a simple second order reaction as usual.Kinetic constants were calculated using the software MATLAB.Furthermore,the effects of temperature and concentrations of reactants on the reaction rate and amine content were discussed.The activation energy of each step was also determined. 展开更多
关键词 Kinetics Isocyanate Polyurethane Catalysis HPLC Kinetic modeling
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Convenient synthesis of nucleoside 5'-(α-P-thio)triphosphates and phosphorothioate nucleic acids(DNA and RNA) 被引量:3
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作者 CATON-WILLIAMS Julianne FIAZ Bilal +1 位作者 HOXHAJ Rudiona SMITH Matthew 《Science China Chemistry》 SCIE EI CAS 2012年第1期80-89,共10页
Modified deoxy-and ribo-nucleoside triphosphates are chemically synthesized in multiple steps due to the protection and deprotection of the nucleoside functionalities.To conveniently synthesize the S-modified triphosp... Modified deoxy-and ribo-nucleoside triphosphates are chemically synthesized in multiple steps due to the protection and deprotection of the nucleoside functionalities.To conveniently synthesize the S-modified triphosphates for enzymatically preparing phosphorothioate DNAs and RNAs(PS-DNA and PS-RNA) as potential therapeutics,herein we report a one-pot strategy to synthesize the deoxy-and ribo-nucleoside 5'-(α-P-thio)triphosphates(dNTPαS and NTPαS) without protecting any nucleoside functionalities.This facile synthesis is achieved by treating the nucleosides with a mild phosphitylating reagent,reacting selectively with the 5'-hydroxyl group of each unprotected nucleoside,followed by sulfurization and hydrolysis to afford the crude dNTPαS and NTPαS analogs(mixtures of Sp and Rp diastereomers).We also demonstrated that after just simple precipitation(without HPLC and ion-exchange purification),the quality of the synthesized dNTPαS and NTPαS analogs is excellent for direct DNA polymerization and RNA transcription,respectively.Since Klenow DNA polymerase and T7 RNA polymerase accept the Sp diastereomers of dNTPαS and NTPαS analogs,respectively,while the Rp diastereomers are neither substrates nor inhibitors,the diastereomerically-pure PS-DNAs and PS-RNAs can be conveniently synthesized enzymatically. 展开更多
关键词 sulfur modification S-derivatized nucleic acid nucleoside triphosphates nucleoside phosphorothioates phosphorothioate DNA and RNA DIASTEREOMERS DNA and RNA polymerases
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Development of a simple and rapid method to measure the free fraction of lamotrigine in plasma using HPLC:applications for therapeutic drug monitoring 被引量:1
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作者 Huanxin Wang Yaxin Sun +3 位作者 Shansen Xu Tong Lu Yanan Chen Limei Zhao 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2018年第12期832-839,共8页
Lamotrigine (LTG) is a widely used antiepileptic drug (AED) for the treatment of new-onset, as well as refractory epilepsy. Due to the narrow treatment window and large individual variability in the pharmacokinetics a... Lamotrigine (LTG) is a widely used antiepileptic drug (AED) for the treatment of new-onset, as well as refractory epilepsy. Due to the narrow treatment window and large individual variability in the pharmacokinetics and pharmacodynamics of LTG, therapeutic drug monitoring (TDM) is necessary in clinical practice to guide dose adjustments. Individual differences and drug combinations can also affect protein binding rate, which further affects the unbound concentration of LTG. The unbound fraction is more closely related to adverse reactions and therapeutic efficacy than total concentration. Therefore, it may be more meaningful to determine the unbound LTG concentration in plasma than the total concentration.Unbound LTG in plasma was extracted by ultrafiltration. High-performance liquid chromatography (HPLC) was used to measure unbound LTG concentration. This method was validated by studies of its selectivity, linearity, lower limit of quantification (LLOQ), accuracy, precision, recovery, and stability.The method was validated over a linear range of 0.2 to 10.0 μg·mL–1, and its LLOQ was 0.2 μg·mL–1. The method’s relative standard deviations (RSDs) for intra-day and inter-day precision were less than 15%, and its accuracy (RE) was ±4.69%. The recoveries of unbound LTG at three different concentrations satisfied the requirements for the analysis of biological samples, and no significant degradation of LTG was observed under different storage conditions.A simple HPLC method showed good performance when used to measure unbound LTG concentration. This method might be used to study the relationship between unboundLTG concentrations and its effectiveness according to TDM. 展开更多
关键词 LAMOTRIGINE Unbound concentration ULTRAFILTRATION HPLC Therapeutic drug monitoring
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Phase-field simulation of dendritic growth in a forced liquid metal flow coupling with boundary heat flux 被引量:5
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作者 DU LiFei ZHANG Rong ZHANG LiMin 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第10期2586-2593,共8页
A phase-field model with forced liquid metal flow was employed to study the effect of boundary heat flux on the dendritic structure forming of a Ni-40.8%Cu alloy with liquid flow during solidification.The effect of th... A phase-field model with forced liquid metal flow was employed to study the effect of boundary heat flux on the dendritic structure forming of a Ni-40.8%Cu alloy with liquid flow during solidification.The effect of the flow field coupling with boundary heat extractions on the morphology change and distributions of concentration and temperature fields was analyzed and discussed.The forced liquid flow could significantly affect the dendrite morphology,concentration and temperature distributions in the solidifying microstructure.And coupling with boundary heat extraction,the solute segregation and concentration diffusion were changed with different heat flux.The morphology,concentration and temperature distributions were significantly influenced by increasing the heat extraction,which could relatively make the effect of liquid flow constrained.With increasing the initial velocity of liquid flow,the lopsided rate of the primary dendrite arm was enlarged and the transition of developing manner of the secondary arms moved to the large heat extraction direction.It was the competition between heat flux and forced liquid flow that finally determined microstructure forming during solidification. 展开更多
关键词 phase-field simulation liquid flow heat flux SOLIDIFICATION
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