An isatin derivative ofβ-cyclodextrin Schiff base was first synthesized by the condensation reaction between the carbonyl group of isatin and ethylenediamino group of the mono-substituted β-cyclodextrin. The Schiff base ligand was chemically linked to homemade ordered mesoporous SBA-15 silica gel via 3-( triethoxysilyl) propyl isocyanate coupling agent. In this way, a novel isatin derivative of β-cyclodextrin-bonded SBA-15 stationary phase ( ISCDP) was prepared for HPLC. Its chemical and physical parameters were characterized by infrared spectroscopy, mass spectroscopy, elemental analysis, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and BET specific surface area analysis. The basic chromatographic property of ISCDP was evaluated by using polar halogenated uracils and disubstituted benzene positional isomers as solute probes in reversed-phase chromatography. ISCDP was also used to enantioseparate twoβ-blocker drugs in polar organic mode and two dansyl amino acids in reversed-phase mode, respectively. The related chromatographic separation mechanism was also discussed. Above studies were expected to provide experimental basis for the practical application of ISCDP in the future. The results showed that the introduction of isatin indole ring could enhanced the reversed-phase chromatographic separation ability of ISCDP for halogenated uracils within 7 min. The new packing also exhibited high stereoselectivity for the position isomers of nitroaniline, aminophenol and benzenediol, in which the para isomers were finally eluted due to strong inclusion interaction between the isatin derivative of β-cyclodextrin ligand and the isomers. Meanwhile, the introduction of isatin indole ring could also improve the chiral separation ability of ISCDP. For example the fast enantioseparations of chiral β-adrenergic blockers and dansyl-amino acids on ISCDP were achieved within 20 min (Rs>1. 3). Obviously, besides hydrophobicity, various synergistic interactions could enhance the separation selectivities of the new stationary phase for chiral and achiral analytes, including dipole-dipole, hydrogen bonding,π-π and inclusion interactions. The ordered pore structure of SBA-15 facilitated to fast and efficient separation and analysis for drugs with good permeability and low mass transfer resistance.

A 6-azido-β-cyclodextrin was synthesized and derivatized with p-nitrophenyl isocyanate as chiral ligand. Following that the ligand was chemically bonded to mesoporous SBA-15 via a ‘Click Chemistry ’ reaction of the azido group with alkynyl group. A new p-nitrophenylcarbamoylatedβ-cyclodextrin bonded SBA-15 chiral stationary phase ( NPCSP ) for HPLC was obtained. The new stationary phase was first used to enantioseparate propranolol in human plasma under the polar organic solvent mode. The effects of methanol content , additive concentration of glacial acetic acid/triethylamine in mobile phase and the temperature on the enantioseparation were studied. The optimal chromatographic conditions were as follows: mobile phase was acetonitrile/methanol/glacial acetic acid/triethylamine (90:10:1. 25:2. 25, V/V), temperature 288 K, flow rate of 0. 5 mL/min, injection volume of 20 μL, detection wavelength at 290 nm. The resolution was 2. 04 with a short run time (< 15 min) under the above conditions. The composition of propranolol in plasma was quantitatively measured by HPLC-MS selected ion monitoring mode ( [ M +H ]+ m/z 260 . 10 ) with hydrochlorothiazide as internal standard. And linear range was 2. 5-250 μg/L and with a good linear relationship. The detection limit was 1 μg/L according to S/N=3. The experimental results showed that the chiral stationary phase exhibited excellent chiral separation ability to propranolol and the analysis method for propranolol in plasma was sensitive, accurate, simple and fast, which could be used for the determination of propranolol in plasma and pharmacokinetic studies.

Objective To study the cellular affinity of the inorganic active element bone scaffold materials. Methods The specific surface area, pore size distribution, porous ratio, permeability ratio of the inorganic active element bone scaffold materials were evaluated in vitro. Human marrow mesenchymal stem cells(MSCs) were cultured and identified by the flow cytometry, the third passage of the cells were used to culture with scaffold materials, to compare with the cells cultured with pure fetal calf serum as the control group. MTT assay was used to examine the effects of scaffold materials on MSCs viability, the growth of cells was observed by scanning electron microscope (SEM). Results The specific surface area of the inorganic active element bone scaffold materials was 210 m2/g, mean pore size was 6 nm, porous ratio was 90 %, and permeability ratio was34 %. MTT assay showed significant difference in the number of cells between the scaffold materials and the control group (P ＜ 0.05 ) on the seventh day, MSCs co-cultured with scaffold materials exhibited good growth as observed under SEM. Conclusion The inorganic active element bone scaffold materials possess preferable cellular affinity, which could be an overall-developed and high potential scaffold material of bone tissue engineering.