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1.
Fernandes L. P. Éhen Zs. Moura T. F. Novák Cs. Sztatisz J. 《Journal of Thermal Analysis and Calorimetry》2004,78(2):557-573
Thermoanalytical techniques, being rapid and un-expensive have been used for the investigation of the cyclodextrin inclusion
complexes for three decades. The conventional thermoanalytical techniques (TG and DTA/DSC) follow the thermal properties of
the uncomplexed compounds. Consequently, the inclusion complex formation as well as the liberation of the entrapped guest
cannot be followed. Monitoring the products of the thermal fragmentation of parent cyclodextrin and the included molecule(s),
applying TG-MS combined technique provides evidence concerning the inclusion complex formation, and besides, gives selective
signal to follow the decomposition of the cyclodextrin inclusion complexes. b-cyclodextrin inclusion complexes of Thymol and
Lippia sidoides Cham essential oil extract have been prepared and investigated using conventional and combined (TG-MS) thermoanalytical techniques.
The evolved gas analysis proved the inclusion complex formation between the host and guests. By the evaluation of the experimental
results the elaboration of the entrapped guests from the cyclodextrin cavity could be followed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
2.
Kai Jun LIAO Xiao Hua YAN Dong Yun ZHAO Xue Yi MA* Department of Chemistry National Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 《中国化学快报》2002,(3)
Lappaconitine (Figure 1) is a diterpenoid alkaloid, naturally occurring in roots and rhizomes of Aconitum and delphinium1. Lap reveals bradycardic and hypotensive activity2. But its application is restrained owing to its poor water solubility, toxicity and side effects on humans. In a number of pharmaceutical studies, b-CD has been reported to interact with many drug molecules to form inclusion complexes for improving the water solubility of drugs, and reducing their toxicity3. We have p… 相似文献
3.
A novel determination method of electroinactive molecules by means of electrochemical technique is presented. A new self-assembled monolayer containing cyclodextrin(CD) is prepared with mono(6-o-p-tolylsulfonyl)-b-cyclodextrin. Although this derivatization process leads to a b-CD coverage of 10% of a full monolayer, this layer shows an effective host-guest response to ferrocene. The interfacial ferrocene complexation gives a response similar to that expected for a Langmuir adsorption isotherm yielding a stability constant of 4.2×104 mol-1@L and a maximum ferrocene coverage of 8.6′10-12 mol/cm2. The redox peak currents of the surface-confined ferrocene de-crease upon addition of competing b-CD guest species to the solution, such as m-toluic acid(mTA) and sodium dodecyl sulfonate(SDS). This principle has been used for the determination of the electroinactive molecules, mTA and SDS in the concentration ranges of 0.8-2.7 mmol/L and 5-100 nmol/L, respectively. 相似文献
4.
5.
QinFenSHI XiaoMeiWANG KeJunPAN WanLiJIANG DiJiangWEN XinBoWANG 《中国化学快报》2004,15(3):375-378
Three new naphthaline-type chromophores end-capped with different (p-substituted amino) styryl groups on the both sides (named as BPASN, BHMASN and BMASN) have been synthesized. Under excitation of 380nm, strong green light-emitting locating at 517nm with the fluorescence quantum yield of 0.88 in CH2Cl2 has been obtained.In the presence of β-cyclodextrin (β-CD), strong blue-emitting at 456nm in DMF was also recorded. 相似文献
6.
Xue Yan SHI Hong Chao GUO Zhen QIAO Shi Cong HOU Min WANG* Key Laboratory of Pesticide Chemistry Application Technology College of Applied Chemistry China Agricultural University Beijing 《中国化学快报》2002,(10)
For high bioactivity of chiral pesticides, more and more chiral isomers are prepared by enantiomer resolution or asymmetric synthesis, and the sales of chiral pesticides continuously increase in recent years1. 1S-Allethrone I and 1S-propargyllone II are indispensable intermediates for synthesizing 1S-bioallethrin and prallethrin respectively, which are representatives of chiral pesticides. Usually, 1S enantiomers of allethrone and propargyllone are more active than their 1R enantiomers wh… 相似文献
7.
GAO Ziwei ZHAO Xiaopeng SUN Ping & SI Gang . Institute of Electrorheological Technology# Department of Applied Physics Northwestern Polytechnical University Xian China . Department of Chemistry School of Chemistry Material Science Shaanxi Normal University Xi''''an China 《中国科学B辑(英文版)》2004,(4)
Electrorheological (ER) fluids have received considerable attention as a kind of novel smart mate-rial in soft matter science. It can realize rapid and re-versible changes of viscosity of a fluid under an ex-ternal electric field of a few kilovolts per millimeter due to dielectric particles polarization, including inner polarization and interfacial polarization[1—4]. In recent years, researchers have found that good ER materials can be designed by dispersion of particles with large dielectri… 相似文献
8.
Ndlebe V. J. Brown M. E. Glass B. D. 《Journal of Thermal Analysis and Calorimetry》2004,77(2):445-457
Triprolidine hydrochloride (C19H22N2·HCl·H2O) (TPH) is a well-known antihistamine drug which is reported as being photosensitive. The thermal stabilities of TPH and
of 1:1 molar and 1:1 mass ratio physical mixtures of TPH with β-cyclodextrin (BCD) and with glucose have been examined using
DSC, TG and TG-FTIR, complemented by X-ray powder diffraction (XRD) and infrared spectroscopic (IR) studies. Thermal studies
of the solid TPH/BCD mixtures indicated that interaction between the components occurs and it is possible that the TPH molecule
may be least partially accommodated in the cavity of the BCD host molecule. XRD results support this indication of inclusion.
The results of molecular modelling suggest that TPH is most likely to be accommodated in the BCD cavity as a neutral triprolidine
molecule with the toluene portion of the molecule preferentially included in the cavity. The results obtained illustrate the
general stability of TPH. The study has also shown TPH to be compatible with both glucose and BCD, which are potential excipients
both in solid and liquid dosage forms. The presence of these excipients in dosage forms will thus not adversely affect the
stability and the therapeutic efficacy of TPH.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
9.
Pose-Vilarnovo B. Rodríguez-Tenreiro Sánchez C. Diéguez Moure N. Vila-Jato J. L. Torres-Labandeira J. J. 《Journal of Thermal Analysis and Calorimetry》2003,73(2):661-670
The effect of a hydrophilic polymer, hydroxypropylmethyl cellulose K4M, on the complexation of diclofenac sodium with b- and
hydroxypropyl-b-cyclodextrins has been studied. Multicomponent systems were prepared with the drug, both cyclodextrin and
the polymer. Phase solubility diagrams revealed the positive effect of the polymer on the complexation of the drug but this
effect was found after autoclaving the solutions. Solid inclusion complexes were prepared by freeze-drying and characterized
by thermal analysis (DSC) and X-ray diffractometry. In solid state, binary inclusion complexes enhance the dissolution behaviour
of diclofenac but, from the b-cyclodextrin multicomponent complex, the polymer controls the release of the drug. In the case
of hydroxy- propyl-b-cyclodextrin multicomponent system, the solubility of the drugs increases significantly compared with
the binary complex.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
LiXuanMU YuWANG ZhaoZHANG WeiJunJIN 《中国化学快报》2004,15(9):1131-1134
In this paper, photoinduced electron transfer(PET)phosphoroionophore,N-(1-bromo-2-naphthylmethyl)-dicthanolamine (BND)was synthesized and its phosphorescent characteristics were studied,The experimental results showed that strong phosphorescence could be observed in β-cyclodextrin apueous solution only at low pH value ,This system combined AND and NOT function to produce a three-input inhibit (INH)logic gate . 相似文献