[Determination of Main Active Components and Metal Elements of Hainan Alpinia Katsumadai by Spectral Analysis].

Fourier transform infrared spectroscopy (FT-IR), UV spectroscopy and fluorescence spectroscopy combined with inductively coupled plasma mass spectrometry (ICP-MS) were employed to analyze Alpinia Katsumadai harvested from Hainan Baisha and Bawangling. The results from FT-IR indicated that the emergence of several characteristic absorption peaks around 1 051, 1 390，2 976 and 3 300 cm-1 belong to flavonoids. In light of second derivative spectra, two similar peaks around 2 977.

(+)-rumphiin and polyalthurea, new compounds from the stems of Polyalthia rumphii.

Two new compounds, (+)-rumphiin (3) and polyalthurea (7), together with seven known ones, 3,4,5-trimethoxy benzoic acid (1), (-)-seselinone (2), cannabisin D (4), allantoin (5), oxostephanine (6) and a mixture of beta-sitosterol (8) and stigmasterol (9) were isolated from the stems of Polyalthia rumphii. The chemical structures of 3 and 7 were elucidated by the combination of spectroscopic data, and the absolute configuration of 3 at C-2 was determined by the matrix method to be R. All compounds were evaluated for their cytotoxicity on four human cancer cell lines, which demonstrated that 3 was a moderate bioactive lignan, and 6 showed significant anticancer activity against SPC-A-1 and BEL-7402 cell lines with IC50 values of 1.

[Study on IR fingerprint spectra of Alpinia oxyphylla Miq].

Fourier transform infrared spectrum has been developed for application in the quality control of traditional Chinese medicine, and two new indexes, including common peak ratio and variant peak ratio, were applied, and their values were calculated by means of the sequential analysis for eight kinds of essence oil of Alpinia oxyphylla Miq from different cultural areas (Hainan, Guangxi and Guangdong), in which each sample's IR fingerprint spectra were set up and the common peak ratio and variant peak ratio sequences were arranged in the order of size in comparison with other samples. It can be seen that Alpinia oxyphylla samples from Guangxi, Hainan and Guangdong provinces could be successfully revealed directly by the common peak ratio and variant peak ratio sequences. In comparison with their conventional IR spectra, the primary difference in Alpinia oxyphylla is the intensity of characteristic peaks at 1 710 and 1 666 cm(-1).

[Studies on characteristics of proton-exchanged LiNbO3 optical waveguides by X-ray diffraction and infrared absorption spectroscopy].

The characteristics of proton-exchanged and annealed proton-exchanged LiNbO3 optical waveguides were studied by X-ray diffraction and infrared absorption spectroscopy. The X-ray diffraction experiments show that there are diffraction peaks of Lil-x, HxNbO3 on the left of the main peak of the LiNbO3 crystal substrate. This result means that the crystal lattice constant of the layer Li1-x, Hx NbO3 is little larger than that of the LiNbO3 crystal substrate, resulting in a stress.

[Infrared absorption spectroscopy of optical waveguide in proton-exchanged LiNbO3].

Z-cut proton-exchanged LiNbO3 optical waveguides exchanged with different proton sources mixed with adipic acid and benzoic acid in different mol ratios were analyzed by infrared absorption spectroscopy. The result shows that there is an absorption peak of OH- free group at 3500 cm(-1) with the characteristic of substitute protons, and the absorption peak of H-bond is nearby 700 cm(-1) with the characteristic of packing protons. The different mixing ratios and different concentrations of H+ in the proton source, result in different proton-exchanged velocities and bring on the change in these absorption peaks.