The intramolecular charge transfer dual fluorescence of p-dibutylaminobenzoic acid-b-cyclodextrin inclusion complex showed a substantially higher sensitivity toward aqueous solution pH variation when compared with tha...The intramolecular charge transfer dual fluorescence of p-dibutylaminobenzoic acid-b-cyclodextrin inclusion complex showed a substantially higher sensitivity toward aqueous solution pH variation when compared with that of p-dibutylaminobenzoic acid alone, which established a new principle for direct CT fluorescence sensing in aqueous solution by using the CT fluorophore-cyclodextrin inclusion complex.展开更多
An equation for determining the equilibrium association constant (KA) of cyclodextrin inclusion complex with fluorescence anisotropy is derived and used to determine KA of pyrene-B-cyclodextrin inclusion complex. The ...An equation for determining the equilibrium association constant (KA) of cyclodextrin inclusion complex with fluorescence anisotropy is derived and used to determine KA of pyrene-B-cyclodextrin inclusion complex. The existing forms of cyclodextrin inclusion complex in solution, the interaction type of host with vip, and the possibility of application of B-cyclodextrin in the analysis of metal ions using naphthalene derivative as a ligand are discussed based on the equation derived along with the curve of fluorescence anisotropy versus cyclodextrin concentration of vip/cyclodextrin system.展开更多
The interaction of beta-cyclodextrin(beta-CD), hydroxypropyl-beta-CD and gamma-CD with the drug rutin has been investigated by using fluorimetry. The stoichiometry of the complexes and their formation constants have b...The interaction of beta-cyclodextrin(beta-CD), hydroxypropyl-beta-CD and gamma-CD with the drug rutin has been investigated by using fluorimetry. The stoichiometry of the complexes and their formation constants have been estimated. The thermodynamic parameters for the formation of complexes were obtained. The complexing ability of HP-beta-CD is remarkably stronger than beta-CD and gamma-CD.展开更多
New composites of waterborne polyurethane （WPU） as a matrix were prepared by incorporating rigid supramolecular nanoplatelets （SNs） as filler, which were self-assembled by the selective inclusion of β-cyclodextr...New composites of waterborne polyurethane （WPU） as a matrix were prepared by incorporating rigid supramolecular nanoplatelets （SNs） as filler, which were self-assembled by the selective inclusion of β-cyclodextrin （β-CD） onto poly（propylene oxide） （PPO） segment in the poly（ethylene oxide）- block-PPO-block-poly（ethylene oxide） （PEO-b-PPO-b-PEO）. It is worth noting that, when the loading level of SN is lower than 3wt%, the SNs with moderate PEO length result in the simultaneous increase in strength, elongation and Young＇s modulus in contrast with neat WPU. If there is no stretching free PEO chain, both strength and elongation decrease in spite of an increase in Young＇s modulus. However, too long PEO chains result in the decrease of mechanical performances while the relatively higher loading-level of SNs also inhibits the enhancement of strength and elongation.展开更多
At present, using cyclodextrins or cyclodextrin derivatives with suitable internal annular dimension to embed C60 so as to form inclusion complexes has been one of the main ways to improve C60＇s water-solubility. In ...At present, using cyclodextrins or cyclodextrin derivatives with suitable internal annular dimension to embed C60 so as to form inclusion complexes has been one of the main ways to improve C60＇s water-solubility. In three kinds of cyclodextrins (α-, β-, γ-CD), only γ-CD has cavity large enough to include C60 whereas α-, and β-CD have not. In the case of DMβCD, the "out-stretching" methyl groups enlarge the cavity so that it can include C60. Starting from the same thought, we use epichlorohydrin crosslinked展开更多
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)-β-c...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)-β-cyclodextrin. Although this derivatization process leads to a β-CD coverage of 10% of a full monolayer, this layer shows an effective host-vip 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 decrease upon addition of competing β-CD vip 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 μmol/L and 5-100 nmol/L, respectively.展开更多
基金This work was support by NNSF of China through grants No.29975023 and No.20175020.
文摘The intramolecular charge transfer dual fluorescence of p-dibutylaminobenzoic acid-b-cyclodextrin inclusion complex showed a substantially higher sensitivity toward aqueous solution pH variation when compared with that of p-dibutylaminobenzoic acid alone, which established a new principle for direct CT fluorescence sensing in aqueous solution by using the CT fluorophore-cyclodextrin inclusion complex.
文摘An equation for determining the equilibrium association constant (KA) of cyclodextrin inclusion complex with fluorescence anisotropy is derived and used to determine KA of pyrene-B-cyclodextrin inclusion complex. The existing forms of cyclodextrin inclusion complex in solution, the interaction type of host with vip, and the possibility of application of B-cyclodextrin in the analysis of metal ions using naphthalene derivative as a ligand are discussed based on the equation derived along with the curve of fluorescence anisotropy versus cyclodextrin concentration of vip/cyclodextrin system.
文摘The interaction of beta-cyclodextrin(beta-CD), hydroxypropyl-beta-CD and gamma-CD with the drug rutin has been investigated by using fluorimetry. The stoichiometry of the complexes and their formation constants have been estimated. The thermodynamic parameters for the formation of complexes were obtained. The complexing ability of HP-beta-CD is remarkably stronger than beta-CD and gamma-CD.
基金Funded by the National Natural Science Foundation of China(20404014and50843031)the Fundamental Research Funds for the Central Universities(Self-Determined and Innovative Research Funds of WUT 2012-Ia-006)
文摘New composites of waterborne polyurethane （WPU） as a matrix were prepared by incorporating rigid supramolecular nanoplatelets （SNs） as filler, which were self-assembled by the selective inclusion of β-cyclodextrin （β-CD） onto poly（propylene oxide） （PPO） segment in the poly（ethylene oxide）- block-PPO-block-poly（ethylene oxide） （PEO-b-PPO-b-PEO）. It is worth noting that, when the loading level of SN is lower than 3wt%, the SNs with moderate PEO length result in the simultaneous increase in strength, elongation and Young＇s modulus in contrast with neat WPU. If there is no stretching free PEO chain, both strength and elongation decrease in spite of an increase in Young＇s modulus. However, too long PEO chains result in the decrease of mechanical performances while the relatively higher loading-level of SNs also inhibits the enhancement of strength and elongation.
基金Project supported by the Doctoral Fund of China and the Science Fund of the Chinese Academy of Sciences.
文摘At present, using cyclodextrins or cyclodextrin derivatives with suitable internal annular dimension to embed C60 so as to form inclusion complexes has been one of the main ways to improve C60＇s water-solubility. In three kinds of cyclodextrins (α-, β-, γ-CD), only γ-CD has cavity large enough to include C60 whereas α-, and β-CD have not. In the case of DMβCD, the "out-stretching" methyl groups enlarge the cavity so that it can include C60. Starting from the same thought, we use epichlorohydrin crosslinked
基金This work was supported by the National Natural Science Foundation of China (Grant No.29975013) the Doctoral Fund of the Ministry of Education of China (Grant No. 20000284033) the Natural Science Foundation of Jiangsu Province (Grant No. BK99030)
文摘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)-β-cyclodextrin. Although this derivatization process leads to a β-CD coverage of 10% of a full monolayer, this layer shows an effective host-vip 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 decrease upon addition of competing β-CD vip 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 μmol/L and 5-100 nmol/L, respectively.
