共查询到10条相似文献,搜索用时 31 毫秒
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利用等温滴定微量热法研究了β-环糊精(β-CD)与阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)的包结作用,并在298.15、303.15、308.15 K温度下,计算了包结体系的包结常数和包结过程的热力学参数.研究发现,β-CD与CTAB可以形成物质的量的比为1∶1的包结物,整个包结过程是熵焓共同驱动的,温度越高,越有利于β-CD与CTAB自发地形成包结物,β-CD与CTAB的结合常数K越大,焓驱动逐渐增强,熵驱动逐渐减弱. 相似文献
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The inclusion complex reaction condition and the mechanism of β-cyclodextrin with hymecromone have been studied by fluorescent
spectrum. The fluorescent intensity and the stability of the system can be qreatly increased in qiven condition, and the formation
constant of the inclusion complex reaction has been determined too. The system can be applied to the determination of trace
amounts of hymecromone, the maximum fluorescent intensity is obtained with excitation and emission wavelength at 362 nm and
452 nm, respectively. The linear range for hymecromone is 8.0×10−9 mol·L−1 to 1.0×10−5 mol·L−1. The detection limit is 1.8×10−9 mol·L−1. A simple, rapid and highly sensitive fluorimetric method is proposed for the determination of hymecromone. The results obtained
are in agreement with those given by an official method.
Foundation item: Supported by the National Natural Science Foundation of China (G1999046703)
Biography: Luo Zhao-fu(1947-), female, Associate professor. 相似文献
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增效荧光法测药物中醋酸氢化泼尼松的含量 总被引:1,自引:0,他引:1
考察了表面活性剂溴化十六烷基三甲铵对肾上腺皮质激素类药物醋酸氢化泼尼松氧化产物的荧光增敏特性 ,据此建立了一种测量醋酸氢化泼尼松的荧光光度分析方法。提出了荧光增强的作用机理。本方法检出限较其它方法低 (3.6 7× 10 -8mol·L-1) ,灵敏度高。用于测定片剂药物中PA的含量 ,分析结果令人满意 相似文献
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Pan Zu-ting Yu Jun-ping College of Chemistry Molecular Sciences Wuhan University Wuhan Hubei China 《武汉大学学报:自然科学英文版》2004,9(3):353-358
0 IntroductionTriamcinoloneAcetonide,9 fluoro 11β,2 1 dihydroxy 16α,17[(1 methylethylidene)bis (oxy) ] pregn 1,4 diene 3,2 0 dione,Mris 4 34.4 8(abr.TA ) .Itbelongstoaclassofadrenalcortexhormonedrug ,whosefunctionsareaffectionofsugarmetabolism ,anti inflammationandresistancehypersusceptibilityetc.TAcanbesuitabletorheumatoidarthritisanddermatosissuchashypersusceptibilityandneuropathicdermatitis .ThefunctionsofTAisstrongerandlongerthantriamcinolone[1 ,2 ] .ThecommonmethodsofdetectingTAm… 相似文献
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The novel chitosan microspheres grafted with β-cyclodextrins (CMGC) were prepared by means of the reaction of chitosan microspheres
and mono-(6-p-tosyl)-β-cyclodextrins (β-CD-OTs-6). β-CD-OTs-6 were gained by the reaction ofp-toluenesulfonyl chloride (TsCl) and β-cyclodextrins (β-CDs). Their structures were proved by Fourier transform infrared spectral
analysis (FT-IR), X ray powder diffraction analysis, and13C NMR; the configuration of CMGC was characterized by scanning electron micrograph (SEM) and transmittance electron micrograph
(TEM). The inclusion complex of CMGC with iodine was prepared and its inclusion ability was studied. The experimental results
showed that some iodine was included with CMGC and formed a stable inclusion. The stable complex of CMGC and iodine (CMGC-I)
shows good antibacterial effect.
Foundation item: Supported by the State Educational Committee Doctoral Foundation of China(2000048615)
Biography: YI Ying (1964-), female, Associate professor, Ph. D candidate, research direction: synthesis of friendly environmental material. 相似文献
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ZHANG Xu WU Feng WANG Beibei DENG Nansheng LUO Mingdao 《武汉大学学报:自然科学英文版》2007,12(3):535-540
The inclusion behavior of 4, 4' -Thiodiphenol (TDP), a typical bisphenol and endocrine disruptor, reacts with β-cyclodextrin (β-CD) in aqueous solutions has been investigated by means of UV absorption spectrum and quantum-chemical calculation with Gaussian 98 software. The results show that the inclusion behavior of TDP is quite different in acidic solutions (pH 5.9) from that in alkaline solutions (pH 10.0). This behavior difference is attributed to the different formula structures in aqueous solutions at acidic and alkaline pH values that are demonstrated by quantum- chemical modeling and calculation. TDP forms a 1 : 1 fl-CD inclusion complex in aqueous solutions. The equiiibrium constant K was calculated to be 553.49 L/mol at pH 5.9 and 1 318.20 L/mol at pH 10.0 respectively for the inclusion complex reaction by using the modified Benesi-Heldbrand equation. After inclusion TDP's structure is changed especially at the inclusion part with the bond order becoming larger, which results in inhibitive photodegradation during direct photooxidation and H2O2 assisted photooxidation. 相似文献
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Inclusion complex of Orange II with β-Cyclodextrin (β-CD) and the anti-photolysis effect under UV-light were investigated.
The molar ratio of inclusion complex of β-Cyclodextrin and Orange II is 1∶1. The formation constantK = 1.236×103 L/mol was determined by the UV and Fluorescence spectra respectively, which was quite in accordance with the calculation
with a modified Benesi-Hildbrand equation. The inclusion complex was characterized by the IR spectra and the molar ratio of
inclusion complex is 1∶1 too. The formation constantK = 1.266×103 L/mol was determined by1H NMR analysis and was nearly the same by UV and fluorescence spectra. The photocatalytic decolorization rate of Orange II
solutions containing β-CD and TiO2 was smaller by 51.9% than that of the Orange II solutions only containing TiO2, while in the case of direct photolysis of Orange II solutions, β-CD can lower the photolysis rate by 48.1% under UV-light.
This result indicates β-CD can inhibit the photolysis and photocatalytic decolorization of Orange II under UV-light. The β-CD
inclusion complex was found to be persistent to UV-light photolysis.
Foundation item: Supported by the National Natural Science Foundation of China (20177017)
Biography: Lu Ping (1958), male. Associate professor, research direction: environmental photochemistry. 相似文献