[The studies on spectrum properties of LB film of Schiff base].

Two Schiff bases with different alkyl chains length, N-dodecyl (2-hydroxy-5-nitro-benzylideneaminato) (TA12) and N-hexadecyl (2-hydroxy-5-nitro-benzylideneaminato) (TA16), were synthesized. Their monolayers behavior and LB films characteristics were investigated and compared by pi-A isotherm, UV-Vis absorption spectra, fluorescence spectra and Micro-IR spectra. The results indicate that TA12 and TA16 have good formation properties.

[Determination of bismuth pectin by flow-injection hydride-generation atomic absorption spectrometry].

A new method was developed by flow-injection hydride-generation atomic absorption spectrometry (FI-HG-AAS) for direct determination of bismuth in bismuth pectin, which is mostly composed of pectin and bismuth and serves as one of pharmaceuticals for protecting stomach mucous membrane. The influences of some experimental parameters of this method, such as the acidity of sample solution, the reductant of KBH4 and NaOH that served as the stabilizer of KBH4, were studied and these parameters were optimized. Bismuth was detected directly with the linear range of 0.

[Direct resolution of clenbuterol enantiomers with amide derivative as chiral stationary phase].

A simple and rapid high performance liquid chromatographic method has been developed for the direct resolution of clenbuterol enantiomers. The method involved the use of an amide type chiral stationary phase(CSP) made of (R)-1-naphthylglycine and 3,5-dinitrobenzoic acid known as the Chirex 3005 column. The effects of different contents of n-hexane, 1,2-dichloroethane and methanol in mobile phase on the chiral separation are discussed.