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微量注射泵添加二甲基亚砜对冰冻机采血小板微聚物的效果分析
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作者 冯志芬 李瑞玲 冯志瑾 《卫生职业教育》 2015年第5期107-108,共2页
目的通过手工和微量注射泵两种方法添加二甲基亚砜(DMSO)并进行比较,系统总结使用微量注射泵降低血小板微聚物发生的主要成效,为各地成分血的推广提供参考。方法应用美国Trima血细胞分离机采集血小板,对冰冻血小板制备过程及整改前后微... 目的通过手工和微量注射泵两种方法添加二甲基亚砜(DMSO)并进行比较,系统总结使用微量注射泵降低血小板微聚物发生的主要成效,为各地成分血的推广提供参考。方法应用美国Trima血细胞分离机采集血小板,对冰冻血小板制备过程及整改前后微聚物阳性率进行比较分析。结果微量注射泵添加DMSO冰冻单采血小板微聚物阳性率明显下降。说明DMSO注入速度和操作规范状况对血小板质量影响较大。整改前,微聚物出现阳性率为14.77%;整改后,微聚物出现阳性率为2.75%。结论使用微量注射泵添加DMSO能明显降低血小板微聚物阳性率。而加强全程质控,严格筛选献血者、规范单采血小板的制备、保证冰冻温度等是降低微聚物发生的重要方面。 展开更多
关键词 冰冻单采血小板 微聚物 量注射泵 阳性率
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阴离子高分子微聚物预处理碳酸钙的技术开发与研究
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作者 黄晖 《造纸科学与技术》 2022年第3期6-8,33,共4页
在生产应用过程,提高碳酸钙用量可以有效的降低成本。但是提高灰分,并不那么简单,要最大限度的提高灰分,减少灰分提高带来的负面影响。使用一些高分子聚合物将填料进行预处理,改善填料的一些性质,降低提高碳酸钙的负面影响,进一步减少... 在生产应用过程,提高碳酸钙用量可以有效的降低成本。但是提高灰分,并不那么简单,要最大限度的提高灰分,减少灰分提高带来的负面影响。使用一些高分子聚合物将填料进行预处理,改善填料的一些性质,降低提高碳酸钙的负面影响,进一步减少植物纤维的用量降低原料成本。 展开更多
关键词 轻质碳酸钙(PCC) 重质碳酸钙(GCC) 灰分 阴离子高分子微聚物 纤维 手抄片 粒径 填料斑
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钛硅分子筛/地聚物复合微球的制备及其催化性能
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作者 陈锦泓 王梦琦 +4 位作者 龙联真 王扬扬 苏文锋 赖芳 葛圆圆 《石油炼制与化工》 CAS CSCD 北大核心 2024年第12期22-30,共9页
以经过聚乙烯亚胺(PEI)修饰后的地聚物微球(GQ)作为载体,采用原位生长的方法,制备了钛硅分子筛/地聚物复合微球(TS-1@GQ)。探讨了PEI浓度对TS-1@GQ催化性能的影响,并运用扫描电镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、X... 以经过聚乙烯亚胺(PEI)修饰后的地聚物微球(GQ)作为载体,采用原位生长的方法,制备了钛硅分子筛/地聚物复合微球(TS-1@GQ)。探讨了PEI浓度对TS-1@GQ催化性能的影响,并运用扫描电镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)等方法对最佳TS-1@GQ进行表征,同时评价了其催化1-己烯制备1,2-环氧己烷的性能。结果表明,当PEI浓度达到0.003 mol/L时,TS-1@GQ表面的TS-1分子筛负载量(w)可达11.43%。在反应温度25℃下,当TS-1@GQ用量为0.02 g、n(1-己烯)∶n(H_(2)O_(2))为1∶1时,TS-1@GQ对1-己烯的转化率可达13.19%,1,2-环氧己烷的选择性达到95.88%,优于商用TS-1的催化效果。此外,该催化剂还展现出了良好的可循环性。 展开更多
关键词 钛硅分子筛 1-己烯 1 2-环氧己烷
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浅谈微粒助留体系的研究现状
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作者 张绪燕 王友成 《华东纸业》 2011年第1期36-38,57,共4页
该文简单介绍了微粒助留体系的研究现状,展望微粒助留体系的发展趋势和应用前景。
关键词 粒助留体系 阴离子 阳离子 有机微聚物
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超微粒助留剂及其应用 被引量:8
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作者 刘军钛 《中华纸业》 CAS 北大核心 2009年第6期82-84,共3页
超微粒助留剂同时使用有机和无机两种微粒子,可以在复杂湿部条件下有效地改善网部留着,尤其是灰分留着。
关键词 粒助留剂 微聚物 有机 膨润土 胶体硅
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Conjugated microporous polymers-scaffolded enzyme cascade systems with enhanced catalytic activity
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作者 Zhenhua Wu Jiafu Shi +6 位作者 Boyu Zhang Yushuai Jiao Xiangxuan Meng Ziyi Chu Yu Chen Yiran Cheng Zhongyi Jiang 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第8期213-223,共11页
Enhancing catalytic activity of multi-enzyme in vitro through substrate channeling effect is promis-ing yet challenging.Herein,conjugated microporous polymers(CMPs)-scaffolded integrated en-zyme cascade systems(I-ECSs... Enhancing catalytic activity of multi-enzyme in vitro through substrate channeling effect is promis-ing yet challenging.Herein,conjugated microporous polymers(CMPs)-scaffolded integrated en-zyme cascade systems(I-ECSs)are constructed through co-entrapping glucose oxidase(GOx)and horseradish peroxidase(HRP),in which hydrogen peroxide(H_(2)O_(2)) is the intermediate product.The interplay of low-resistance mass transfer pathway and appropriate pore wall-H_(2)O_(2) interactions facilitates the directed transfer of H_(2)O_(2),resulting in 2.4-fold and 5.0-fold elevation in catalytic activ-ity compared to free ECSs and separated ECSs,respectively.The substrate channeling effect could be regulated by altering the mass ratio of GOx to HRP.Besides,I-ECSs demonstrate excellent stabili-ties in harsh environments and multiple recycling. 展开更多
关键词 BIOCATALYSIS IMMOBILIZATION Enzyme cascade system Substrate channeling effect Conjugated microporous polymers
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一次性输血器改装成骨髓过滤器的临床应用
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作者 李健 张宝荣 +4 位作者 徐敬 张娜娜 贺景娟 万岁桂 苏力 《护理研究》 2005年第4期637-637,共1页
关键词 一次性输血器 临床应用 骨髓 过滤器 造血干细胞移植 改装 血液制品 2000年 造血重建 输注 微聚物
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Effects of monosaccharides and protein in extracellular polymeric substances of Klebsiella aerogenes on crystalline forms of CaCO_(3) crystals
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作者 Nan HU Ai-shu LI +5 位作者 Huang YU Yu-long LIU Hui ZHANG Zhi-hui YANG Guang-yue LI De-xin DING 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第12期4085-4098,共14页
A strain of Klebsiella aerogenes(K.aerogenes)capable of decomposing calcium acetate for CaCO_(3) biomineralization was screened,and the optimum conditions for producing the maximum mass of CaCO_(3) crystals induced by... A strain of Klebsiella aerogenes(K.aerogenes)capable of decomposing calcium acetate for CaCO_(3) biomineralization was screened,and the optimum conditions for producing the maximum mass of CaCO_(3) crystals induced by Klebsiella aerogenes were found to be 0.25 mol/L calcium acetate,4%inoculum level,and pH 7.Following that,the monosaccharides and proteins contained in the extracellular polymeric substances(EPS)of Klebsiella aerogenes were identified.The effects of additional identified monosaccharide and proteins on the crystalline form conversion of CaCO_(3) crystals were investigated,and the additional monosaccharides were found to promote the crystalline form conversion of CaCO_(3) crystals from vaterite to calcite.Specifically,adding 1.00 g/L glucuronic acid was observed to enhance the conversion of crystalline phases of CaCO_(3) crystals to calcite completely after 5 d.Meanwhile,additional catalase was observed to contribute to the regular morphology of CaCO_(3) crystals without affecting their crystalline phases.The results indicate that the additional glucuronic acid influences the crystalline forms of CaCO_(3) crystals significantly. 展开更多
关键词 URANIUM CaCO_(3)crystal microbially induced CaCO_(3)precipitation extracellular polymeric substances Klebsiella aerogenes
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Bioleaching of Pb-Zn-Sn chalcopyrite concentrate in tank bioreactor and microbial community succession analysis 被引量:5
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作者 王军 赵红波 +3 位作者 庄田 覃文庆 朱珊 邱冠周 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第12期3758-3762,共5页
The variation of microbial community structure was investigated for the tank bioleaching process of Pb-Zn-Sn chalcopyrite concentrate in the presence of mixed moderately thermophilic bacteria. The parameters, such as ... The variation of microbial community structure was investigated for the tank bioleaching process of Pb-Zn-Sn chalcopyrite concentrate in the presence of mixed moderately thermophilic bacteria. The parameters, such as pH value, solution potential and concentrations of metal ions, were determined by the method of polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) to analyze the succession of microbial community. The results showed that a final copper extraction rate of 85.6% could be obtained after tank bioleaching for 30 d. The Acidithiobacillus caldus was the dominant population with abundance of about 73.80%in the initial stage, then Sulfobacillus thermosulfidooxidans dominated from the 18th day to the end of bioleaching, while the abundance of Leptospirillum ferriphilum changed slightly. A higher solution potential within a certain range and appropriate concentration of ferric ions were essential for this tank bioleaching of chalcopyrite. 展开更多
关键词 CHALCOPYRITE tank bioleaching microbial community PCR-RFLP technique
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Synthesis,crystal structure and adsorption properties of a novel Fe(Ⅲ) porous coordination polymer containing 1,4-naphthalenedicarboxylate ligand 被引量:1
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作者 陈金喜 孟伟伟 张若冰 《Journal of Southeast University(English Edition)》 EI CAS 2011年第1期107-110,共4页
A novel porous coordination polymer,iron naphthalenedicarboxylate Fe(OH)(1,4-NDC)·2H2O is hydrothermally synthesized by the reaction of FeSO4·7H2O and 1,4-naphthalenedicarboxylic acid(1,4-H2NDC) at 150... A novel porous coordination polymer,iron naphthalenedicarboxylate Fe(OH)(1,4-NDC)·2H2O is hydrothermally synthesized by the reaction of FeSO4·7H2O and 1,4-naphthalenedicarboxylic acid(1,4-H2NDC) at 150℃.The compound crystallizes in a tetragonal space group P42/nmc:a=2.1447(4) nm,c=0.68849(14) nm,V=3.1669(11) nm3,Z=8,R=0.0845,wR=0.1829.The crystal structure exhibits a three-dimensional framework which is composed of infinite chains of corner-sharing octahedral Fe(OH)2O4 with 1,4-NDC ligands forming two types of channels with square-shaped cross-sections.The large channels present a cross-section of 0.76 nm×0.76 nm,while the small channels are about 0.30 nm×0.30 nm.No structural transformation occurs after removing the guest water molecules,while a robust structure generates with permanent porosity.The adsorption measurements show that the anhydrous sample of the compound can adsorb CO2 into its pores.The adsorption isotherms for methanol,acetone,tetrahydrofuran and benzene are also measured. 展开更多
关键词 porous coordination polymer selective adsorption 1 4-naphthalenedicarboxylic acid
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An accelerated method to evaluate thymopentin release from microspheres in vitro 被引量:2
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作者 艾国 梅兴国 《Journal of Chinese Pharmaceutical Sciences》 CAS 2008年第1期41-45,共5页
To design an accelerated method to evaluate thymopentin release from PLGA microspheres in vitro. Microspheres were prepared by double emulsion technique, using poly(lactide-co-glycolide) (PLGA) as carrier. At high... To design an accelerated method to evaluate thymopentin release from PLGA microspheres in vitro. Microspheres were prepared by double emulsion technique, using poly(lactide-co-glycolide) (PLGA) as carrier. At higher medium temperature (45℃, 50℃ and 55℃), an accelerated release testing in short time was studied and correlated with the conventional release (37℃) in vitro. The release in vitro of thymopentin from PLGA microspheres at 45 ℃, 50℃ and 55℃ was significantly accelerated (P 〈 0.05). In particular, at 50℃, an accelerated release (30 h) of the hydrophilic peptide from the PLGA matrix was achieved and correlated well with the conventional release (30 d). An accelerated release testing in vitro at higher temperature could be used to monitor thymopentin release from PLGA microspheres. 展开更多
关键词 THYMOPENTIN PLGA microspheres Accelerated release in vitro Glass transition temperature
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Preparation, Characterization and in Vitro Release of Ciprofloxacin Polylactic Acid Microspheres 被引量:1
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作者 杨帆 梁仁 +3 位作者 潘育方 赵耀明 旺朝阳 徐安龙 《Journal of Chinese Pharmaceutical Sciences》 CAS 2005年第2期95-99,共5页
Aim Ciprofloxacin polylactic acid microspheres (CFX-PLA-MS) were preparedusing solvent evaporation method from a solid-in-oil-in-water emulsion system. Methods Orthogonalexperiment was used to optimize the method of C... Aim Ciprofloxacin polylactic acid microspheres (CFX-PLA-MS) were preparedusing solvent evaporation method from a solid-in-oil-in-water emulsion system. Methods Orthogonalexperiment was used to optimize the method of CFX-PLA-MS preparation. Microspheres werecharacterized in terms of morphology, size, encapsulation efficiency, drug loading and in vitro drugrelease. Results The physical state of CFX-PLA-MS was determined by scanning electron microscopy(SEM) and differential scanning calorimetry (DSC) . Microspheres formed were spherical with smoothsurfaces. Drug was enveloped in microspheres without mixing physically with PLA. The averageparticle size was 280.80 ± 0.15 μm, with over 90% of microspheres falling in the range of 250 -390 μm. The encapsulation efficiency was 65.8% ± 0.58% and the drug loading was 34.1% ± 0.51% .In vitro release study revealed a profile of sustained release of Ciprofloxacin from CFX-PLA-MS. Theaccumulated release percentage and half-life (T_(1/2) of Ciprofloxacin microspheres were 84.0% in53.2 h, and 31.9 h, respectively. Higuchi equation was Q= -0.0043 + 0.003 9 t^(1/2), r = 0.9941.Conclusion Ciprofloxacin microspheres have been successfully prepared and sustained release of CFXfrom microspheres is achieved. 展开更多
关键词 CIPROFLOXACIN polylactic acid MICROSPHERES PREPARATION release in vitro
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An Investigation on the Polymerization of Styrene by Fluorescence Probe Technique 被引量:3
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作者 李新松 王国昌 何炳林 《Journal of Southeast University(English Edition)》 EI CAS 1999年第2期84-87,共4页
The polymerization of styrene is monitored by pyrene excimer formation. The ratio of monomer to excimer intensities ( I m/ I e) of pyrene increases as polymerization proceeds. The increase of I m/ I e... The polymerization of styrene is monitored by pyrene excimer formation. The ratio of monomer to excimer intensities ( I m/ I e) of pyrene increases as polymerization proceeds. The increase of I m/ I e is ascribed to the increase of microviscosity surrounding the probes forming excimer during polymerization. The linear relationship between the changing rate of I m/ I e and the polymerization rate of styrene is obtained. Therefore, I m/ I e may be used to monitor the progress of the polymerization of styrene. 展开更多
关键词 excimer fluorescence POLYMERIZATION MICROVISCOSITY STYRENE
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Preparation of Cetyl-Chitosan Nanoparticles as Carriers for Paracetamol 被引量:1
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作者 代昭 孙多先 郭瑶 《Transactions of Tianjin University》 EI CAS 2002年第4期235-238,共4页
Cetyl-chitosan, prepared by reacting chitosan with chlorocetane under alkaline condition, is soluble and spontaneously forms nanoparticles about 100 nm in diameter. Infrared spectra (IR) revealed that there was a subs... Cetyl-chitosan, prepared by reacting chitosan with chlorocetane under alkaline condition, is soluble and spontaneously forms nanoparticles about 100 nm in diameter. Infrared spectra (IR) revealed that there was a substitution reaction mainly on the amine groups of chitosan (CS). By using paracetamol (PCTM) as a model drug, the balanced release concentration of PCTM in phosphate buffer solution (pH=7.4) can be decreased with the increase of degree of substitution alkyl and can be reduced effectively even under a lower PCTM loading. 展开更多
关键词 CHITOSAN cetyl-chitosan NANOPARTICLES drug delivery system PARACETAMOL
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Preparation and in Vitro Evaluation of Polylactic Acid (PLA) or Polylactic-co-Glycolic Acid (PLGA) Microcapsules Loaded with Estradiol 被引量:1
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作者 周新腾 朱峰 +2 位作者 潘卫三 王磊 张汝华 《Journal of Chinese Pharmaceutical Sciences》 CAS 2003年第2期87-92,共6页
Aim PLA/PLGA was used as biodegradable and biocompatible carriers to achieve sustained release of estradiol (E 2). Methods Microcapsules (MC) were prepared by an emulsification solvent extraction method, and then ... Aim PLA/PLGA was used as biodegradable and biocompatible carriers to achieve sustained release of estradiol (E 2). Methods Microcapsules (MC) were prepared by an emulsification solvent extraction method, and then the properties and in vitro drug release behavior of MC were examined. An analysis of variance (ANOVA) was used to test the statistical significance. Then, multiple comparisons were made with a T method between levels to examine the significance of difference further. For all the results a P value 】0 05 was considered statistically insignificant . Results Under the same conditions, the water adding speed and the particle size had significant effects ( P 【0 01) on the entrapment efficiency of MC; the water adding speed and the concentration of PLA in the oil phase had significant effects ( P 【0 01) on the diameter MC in medium. Release of E 2 from MC was influenced significantly ( P 【0 01) by the water adding speed and the type and molecule weight of the polymers. But the differences between levels of the variates were not all significant. Conclusion E 2 PLA/PLGA MC with various properties can be formed when the formulation and the technology were changed accordingly. 展开更多
关键词 MICROCAPSULES ESTRADIOL PLA PLGA emulsification solvent extraction
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Pyrolysis-Gas Chromatography/Mass Spectrometry for Microstructure and Pyrolysis Pathway of Polyester-Polyether Multiblock Copolymer
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作者 罗爱芹 叶玲 +2 位作者 傅若农 谢桂阳 王显伦 《Journal of Beijing Institute of Technology》 EI CAS 2001年第1期45-50,共6页
The composition and sequence distribution of monomeric units in polyester polyether multiblock copolymer were studied by pyrolysis? gas chromatography (PGC) and pyrolysis gas chromatography/mass spectrometry (PGC/M... The composition and sequence distribution of monomeric units in polyester polyether multiblock copolymer were studied by pyrolysis? gas chromatography (PGC) and pyrolysis gas chromatography/mass spectrometry (PGC/MS). PGC was applied to study the F t curve of the multiblock copolymer and PGC/MS was used to separate and identify the pyrolyzates. DTA experiment was used to study the decomposition temperature. The results show that the beginning point of elastomer’s decomposition was about 300?℃ and the decomposition temperature of most of the sample was 550?℃. Many pyrolyzates were produced because of the breaking of weak bonds in the sample. The possible microstructure was verified and the pyrolysis pathway of the copolymer was investigated. 展开更多
关键词 thermoplastic elastomer polyester polyether multiblock copolymer pyrolysis gas chromatography/mass spectrometry copolymer pyrolysis pathway MICROSTRUCTURE pyrolyzates
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Effect of sodium sulfate on strength and microstructure of alkali-activated fly ash based geopolymer 被引量:24
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作者 LV Qing-feng WANG Zi-shuai +2 位作者 GU Liu-yang CHEN Yi SHAN Xiao-kang 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第6期1691-1702,共12页
The main objective of this paper focuses on the changes that occur in the strength and microstructural properties of sodium silicate activated fly ash based geopolymer due to varying the sulfate salt and water content... The main objective of this paper focuses on the changes that occur in the strength and microstructural properties of sodium silicate activated fly ash based geopolymer due to varying the sulfate salt and water content.A series of tests including X-ray diffraction,Fourier transform infrared spectroscopy,scanning electron microscopy,physical adsorption and unconfined compressive strength were used to investigate this effect.The results indicate that the higher water content has an adverse effect on the alkali activation and microstructural properties of geopolymer,so the optimum mass ratio of sodium sulfate in alkali-activated geopolymer under different water-to-binder ratios shows a“peak shifting”phenomenon,i.e.,the higher the water-to-binder ratio,the higher the optimum mass ratio.Lower presence of sodium sulfate has no significant effect on the alkali-activated geopolymer systems;higher addition of sodium sulfate,however,could cause the symmetrical stretching vibration of Si—O and the symmetrical stretching vibration of Si—O—Si and Al—O—Si,and promote the formation of N-A-S-H gels.Furthermore,the cement effect of the gel and sodium sulfate aggregate could improve the integrity of pore structure obviously.The maximum strength of geopolymer curing at ambient temperature was 52 MPa.This study obtains the rule that the strength properties of alkali-activated geopolymers vary with the water-to-binder ratio and sodium sulfate content.The feasibility of geopolymer co-activated by sodium sulfate and sodium silicate was investigated,and reference for engineering application of alkali-activated geopolymer in salt-bearing areas was provided. 展开更多
关键词 GEOPOLYMER MICROSTRUCTURE fly ash sodium sulfate water-to-binder ratio
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Acrylonitrile-methyl Methacrylate Copolymer Films Containing Microencapsulated n-Octadecane 被引量:2
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作者 李军 韩娜 张兴祥 《Journal of Donghua University(English Edition)》 EI CAS 2006年第5期10-14,共5页
Acryionitrilv-methyi mcthacrylate copolymer was synthesized in aqueous solution by Redox. The copolymer was mixed with 10 - 40 wt% of microencapsulated n-octadecane (MieroPCMs) in water. Copolymer films containing M... Acryionitrilv-methyi mcthacrylate copolymer was synthesized in aqueous solution by Redox. The copolymer was mixed with 10 - 40 wt% of microencapsulated n-octadecane (MieroPCMs) in water. Copolymer films containing Mi- eroPCMs were cast at room temperature in N, N- imethyiformamide solution. The copolymer of acrylonitrile-methyl methacrylate and the copolymer films containing MicroPC- Ms were characterized by using Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Thermosravimetrlc Analyzer (TG), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), etc. The mierocapsules in the films are evenly distributed in the copolymer matrix. The heat-absorbing temperatures and heat-evolving temperatures of the films are almost the same as that of the MieroPCMs, respectively, and fluctuate in a slight range. In addition, the enthalpy efficiency of MieroPCMs rises with the contents of MicroPCMs increasing. The crystallirdty of the film increases with the contents of MicroPOMs increasing. 展开更多
关键词 acrylonitrile-methyl methacrylate copolymer MicroPCMs FILM heat storage.
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GPs-PVA/MCE多功能杂化膜的制备及性能 被引量:1
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作者 宋颖 葛圆圆 +3 位作者 韩玉蓉 周覃艺 黄来涛 周剑 《化工进展》 EI CAS CSCD 北大核心 2021年第11期6287-6294,共8页
地聚物微纳米粒子(GPs)经聚乙烯醇(PVA)修饰后,采用真空抽滤法将其组装在混合纤维素基膜(MCE)表面,得到多功能地聚物颗粒-聚乙烯醇/混合纤维素杂化膜(GPs-PVA/MCE)。本文考察了GPs的添加量对杂化膜结构和性能的影响,通过SEM、FTIR、AFM... 地聚物微纳米粒子(GPs)经聚乙烯醇(PVA)修饰后,采用真空抽滤法将其组装在混合纤维素基膜(MCE)表面,得到多功能地聚物颗粒-聚乙烯醇/混合纤维素杂化膜(GPs-PVA/MCE)。本文考察了GPs的添加量对杂化膜结构和性能的影响,通过SEM、FTIR、AFM、XRD等表征杂化膜的结构。结果表明GPs添加量为0.15g时制备的杂化膜性能最佳,水通量为11293L/(m2·h·MPa)。该多功能杂化膜对不同污染物均表现出优异的去除性能:通过孔道截留作用可去除水中100%的50nm聚苯乙烯微球和99.87%的乳化油;通过吸附作用亦可去除水中100%的阳离子型染料;比原始MCE膜分别提升了528.54%、25.78%、90.96%。特别是在连续处理含油乳液时,该杂化膜使用1h后通量仅降低了21.70%,远低于MCE膜的95.70%,说明其抗污染性能得到显著提升,显示出良好的应用潜力。 展开更多
关键词 纳米颗粒 乙烯醇 杂化膜 染料
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Immobilization of penicillin G acylase on paramagnetic polymer microspheres with epoxy groups 被引量:7
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作者 Xing Chen Lu Yang +5 位作者 Wangcheng Zhan Li Wang Yun Guo Yunsong Wang Guanzhong Lu Yanglong Guo 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第1期47-53,共7页
Paramagnetic polymer microspheres were synthesized by the inverse suspension polymerizationmethod through polymerization of glycidyl methacrylate,ally glycidyl ether and methacrylamide onthe surface of silica‐coated ... Paramagnetic polymer microspheres were synthesized by the inverse suspension polymerizationmethod through polymerization of glycidyl methacrylate,ally glycidyl ether and methacrylamide onthe surface of silica‐coated Fe3O4nanoparticles using N,N’‐methylene‐bis(acrylamide)as across‐linking agent.Penicillin G acylase(PGA)was covalently immobilized on the surface of theparamagnetic microspheres by reacting the amino groups of the PGA molecules with the epoxygroups of the paramagnetic polymer microspheres.The effect of the SiO2coating and the amount ofparamagnetic Fe3O4nanoparticles on the initial activity and the operational stability of the immobilizedPGA was investigated.The results indicated that SiO2played an important role in the polymerization process and paramagnetic polymer microspheres with a SiO2‐coated Fe3O4nanoparticles mass content of7.5%are an optimal support material for PGA immobilization.Immobilized PGA on the paramagnetic polymer microspheres shows a high initial activity of430U/g(wet)and retains99%of its initial activity after recycling10times.Furthermore,immobilized PGA exhibits high thermal stability,pH stability and excellent reusability,which can be rapidly recycled by the aid of magnet.?2018,Dalian Institute of Chemical Physics,Chinese Academy of Sciences.Published by Elsevier B.V.All rights reserved. 展开更多
关键词 Paramagnetic polymer microspheres Epoxy groups Penicillin G acylase Covalent bonding IMMOBILIZATION
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