Talatisamine, a C(19)-diterpenoid alkaloid from Chinese traditional herbal 'Chuanwu'.

THE TITLE COMPOUND [SYSTEMATIC NAME: (1S,4S,5R,7S,8S,9R,10R,11S,13S,14S,16S,17R)-N-methyl-8,14-dihy-droxy-1,16-tri-meth-oxy-4-(meth-oxy-methyl-ene)aconitane], C(24)H(39)NO(5), was isolated from the roots of Aconitum carmichaelii Debx., which is known as 'Chuanwu' in Chinese traditional herbal medicine. The mol-ecule has an aconitane carbon skeleton with four six-membered rings and two five-membered rings, including a six-membered N-containing heterocyclic ring. Both five-membered rings adopt envelope conformations. The four six-membered adopt chair conformations. Two intra-molecular O-H⋯O hydrogen bonds occur.

[Determination of diosgenin and ruscogenin in Radix Ophiopogonis by nonaqueous capillary electrophoresis].

Nonaqueous capillary electrophoresis is used for the determination of the contents of diosgenin and ruscogenin in Radix Ophiopogonis. The operating buffer was composed of 20 mmol x L(-1) Na2B4O7-HCl (pH 7.61) in 70% methanol. The applied voltage was 25 kV and detection potential was at +0.70 V. With these conditions, the components were successfully separated. The content of diosgenin in Radix Ophiopogonis was 0.018 mg x g(-1) and ruscogenin was 0.008 mg x g(-1). The average recoveries of diosgenin and ruscogenin were 102% and 99.2%, respectively. A new method of the quality control of diosgenin and ruscogenin in Radix Ophiopogonis is provided.

[Research on the interaction of aristolochic acid and bovine serum albumin].

The interaction between aristolochic acid and bovine serum albumin (BSA) under physiological conditions was investigated by fluorescence quenching methods. The results indicate that there is a strong interaction between aristolochic acid and BSA, and the distances between the binding location and tryptophan residue is 2.8 nm. The binding location of aristolochic acid in BSA is in subdomain III A. In addition, the effects of aristolochic acid on the protein second structure were studied using CD and FTIR techniques. The results of CD proved that the alpha-helix contents of BSA decreased from 43.5% to 36.7% after binding with aristolochic acid.

[Experimental investigation of CAEP far-infra-red 100 microm FEL spontaneous emission].

In the FEL experiment, when electron beam passes through the wiggler, the movement of electron beam will be changed to wiggle in the wiggler due to the periodical magnet field. Meanwhile the electron beam will spontaneously emit the radiation with a wavelength similiar to the FEL radiation. This radiation is influenced by the parameters of both the electron beam and the wiggler. The gain of FEL was determined by the spontaneous emission spectrometer, and the spectrum width mainly determined by the periods of wiggler and electron energy homogeneity (deltaE/E). According to the measured parameters of electron beam and the wiggler, the spontaneous emission was studied. In the experiment, the spectrum of the spontaneous emission was measured by far infrared 100 microm spectrometer with Ge:Ga detector.

[Simultaneous determination of the four effective components in Huaijiao pill by HPLC].

OBJECTIVE: To develop an HPLC method for determination of the four effective components (genistin; rutin; quercetin; genistein) in Huaijiao pill. METHOD: The chromatographic separation was performed on a Shim-packODS (4.6 mm x 150 mm, 5.0 microm) eluted with a mobile phase of MeOH-H2O-HAc (40:60:0.25). The detection wavelength was set at 256 nm and column temperature was set at 30 degrees C . RESULT: Nice linear relation between the peak area and injected amount exists when the amount is within 0.059-0.352 microg for genistin, within 0.435-2.610 microg for rutin, within 0.020-0.121 microg for quercetin and within 0.053-0.319 microg for genistein. The correlation coefficient of each component is 0.999 6, 0.998 2, 0.998 9 and 0.999 9 respectively. The average recoveries of the four components are from 98.7% to 100.2%. The RSD of each group are 1.21%, 1.36%, 0.47% and 1.54% (n = 5). CONCLUSION: The method was accurate, repeatable and suitable to determine four effective components in Huaijiao pill. It can be use for quality control of Huaijiao pill.

[Study of the methods of determining the isoflavones in herbs of Trifolium pratense extractive].

OBJECTIVE: To study the methods of determining the amount of Isoflavones in red clover extractive. METHOD: RP-HPLC is employed to determine the Isoflavones, with a C18 RP Column, a moble phase of MeOH-CH3CN-0.1%H3PO4 and a detection wavelength of 260 nm. RESULT: After being water-solved, the four groups of flavoes elements satisfactorily separated, the amount of feeding in a range of 0.024-0.336 microg which has a good linear relationship with the peaks, and the total isoflavones determining results repetition, RSD=10.1%. CONCLUSION: A simple, reliable and effective quality-control method is given.