Aim:To develop a method for rapid and sensitive simultaneous determination of the hydrophilic and lipophilic active components in Salvia miltiorrhiza tablets. Methods:RP-HPLC condition was established to separate danshensu,salvianolic acid B,cryptotanshinone and tanshinone ⅡA from each other on the Diamonsil C18(250 mm×4.6 mm ID,5 μm)column with the mobile phase consisted of methanol and 0.5% formic acid in gradient elution. Results:The four active components had good linearity. The average recoveries ranged between 96.63% to 100.3% with RSDs of less than 2%. Conclusion:The method appeared to be precise and accurate for the simultaneous determination of the four active components in Salvia miltiorrhiza Bunge tablets within 35 min.

Objective A rare HLA phenotype carrying three HLA-A antigens, A2, A11.2 and A24, was identified in a potential bone marrow donor SZHD1. Methods To determine molecular basis of this phenotype the HLA-A gene fragments from this donor and his family members were cloned and sequenced. Results Sequencing analysis indicated that the donor carries an unusual HLA haplotype, A*1102, A*24020101; B*38; DRB1*15. Conclusions Other four family members were found to carry this haplotype, which as a Mendelian gene was segregated and stably transmitted through three generations. This is a first example of a family carrying triple HLA-A antigens to the best of our knowledge.

Aim:To develop a practical chiral CE method for the quantitative determination of the unwanted enantiomer[( R )-enantiomer]presented in zolmitriptan. Methods:The background electrolyte was 20 mmol/L sodium dihydrogenphosphate solution with 1% S-β-CD,adjusted to pH 3.50 with phosphoric acid. A fused-silica capillary(60 cm×50 μm ID,effective length 51.5 cm)was used at 20 ℃ for the separation. The applied voltage was -30 kV. The samples were loaded by hydrodynamic injection(50 mbar pressure,6 s). UV was measured at 220 nm. Results:Zolmitriptan and its chiral impurity were baseline resolved ( R s=6.66). The linearity was good over the concentration range from 4 to 80 μg/mL( r =0.999 8) of ( R )-enantiomer. The injection precision (expressed as CV%) was 2.83%. The average recovery was 99.97%( n =9). The limit of detection was 1.5 μg/mL. The host-guest complex binding constants were 964 and 905 mol-1 for ( R )-enantiomer and zolmitriptan,respectively. Conclusion:The method is suitable for the determination of ( R )-enantiomer in zolmitriptan and binding constants of zolmitriptan enantiomers to S-β-CD.

AIM: To establish an LC-MS/MS method for determination of evodiamine concentration in rat plasma and to study its pharmacokinetic profile in rats. METHODS: Six rats were administrated (i.g.) evodiamine at the dose of 100 mg/kg. Blood samples were collected from eye socket. Evodiamine concentration in rat plasma was determined by LC-MS/MS method. The pharmacokinetic parameters were calculated using DAS program. RESULTS: A good linear relationship was obtained in the concentration range (0.2-50.0 ng/mL) studied (r2=0.9997). Average recoveries ranged from 96.12% to 99.46%. Intra-and inter-day relative standard deviations were 4.61%-13.51% and 5.65%-11.49%, respectively. The main pharmacokinetic parameters of evodiamine were as follows: Cmax (5.3±1.5) ng/mL; tmax (22±8) min; t1/2 (451±176) min. CONCLUSION: A selective and sensitive liquid chromatography-tandem mass spectrometric (LC-MS/MS) method for the quantification of evodiamine in rat plasma is developed and validated. This method is successfully applied for the pharmacokinetic studies of evodiamine in rats.

AIM: To determine the concentration of escitalopram in human plasma by HPLC-MS/MS and investigate the pharmacokinetics of escitalopram. METH-ODS: The method involved protein precipitation with methanol. The chromatographic separation was achieved within 6.0 min by using methanol-water with 15 mmol·L-1 ammonium acetate-formic acid (72:28:O.1, v/v/v) as mobile phase and a Lichrospher CN 150 mm×4.6 mm analytical column. The analytes were detected using an electrospray ionization tandem mass spectrometry in SRM mode. Detection of the ions was performed by monitoring the transitions of m/z 325.0 to 234.0 for escitalopram and m/z 409.1 to 238.1 for amlodipine (intemal standard), respectively. RESULTS:The standard curve was linear ( r = 0. 999) over the concentration range of 0.20 - 50.00 ng· ml- 1. Accuracy and precision were below the acceptance limits of 15%. The recoveries of escitalopram ranged from 96.0% to 103.6%. The lower limit of quantification for escitalopram was 0.20 ng· ml-1 using 200 μl plasma sample.The pharmacokinetic parameters of escitalopram after a single oral dosing of escitalopram oxalate tablet (10 rog)to ten healthy male volunteers were achieved. The Cmax, Tmax, AUC0-t, AUC0-∞, t1/2 and Ke of escitalopram were 9.21±2.10 ng·ml-1 , 3.75±1.04 h, 514.6±152.3 ng·h·ml-1 ,540.5±162.3 ng·h·ml-1 , 34.06±7.71 h and 0.021±0.004 h-1,respectively. CONCLUSION:The determination of concentration of escitalopram in human plasma by HPLC-MS/MS method was repid, sensitive and reliable. It can be used for clinical pharmacokinetic study of escitalopram.

Objective: To investigate protective effects of nicotinamide mononucleotide (NMN) on ethanol-induced DNA damage in L02 cells, so as to provide the evidence for adjuvant therapy of NMN on alcoholic liver diseases. Methods: L02 cells were pretreated with different concentrations of NMN (0, 1, 2, 4 and 8 mmol/L) for 6 h, and then were exposed to 0.4% ethanol for 12 h. The treated cells were divided into the control group, 0.4% ethanol group and different concentrations of NMN groups. Cell viability was analyzed using trypan blue staining for determining the concentration of NMN as a protective agent. The effects of NMN on ethanol-induced DNA damage in L02 cells were evaluated using immunofluorescence detection and reactive oxygen species (ROS) assay. L02 cells were exposed to 0.4% ethanol for 12 h, cultured in a medium containing a protective concentration of NMN, and divided into PBS group and NMN group. Cell viability was detected at 0, 2, 4, 8, 16 and 32 h, and the effects of NMN on repairing ethanol-induced DNA damage were evaluated by alkaline comet assay. Results: The cell viability was lower in 0.4% ethanol group than than in the control group, and was higher in different concentrations of NMN groups than in 0.4% ethanol group (all P<0.05), with no significant difference in the cells viability between 4 mmol/L and higher concentrations of NMN groups and the control group (all P>0.05). Therefore, 4 mmol/L NMN was selected as a protective agent. The cell tail moments, relative immunofluorescence intensities of γH2AX and relative levels of ROS were higher in 0.4% ethanol group than in the control group, and lower in 4 mmol/L and higher concentrations of NMN groups than in 0.4% ethanol group (all P<0.05). The cell viability was increased and the cell tail moment was shortened with the increase of 4 mmol/L NMN intervention time; and the cell viability in 4 h and more of NMN groups were higher, and the cell tail moment were lower than that in PBS group (all P<0.05). Conclusions NMN attenuates DNA damage in a dose-dependent manner and promotes the repair of DNA damage in a time-dependent manner. NMN has a protective effect on ethanol-induced DNA damage in hepatocytes.

Objective In view of the trend of networking development in modern high education and the characteristics of students' strong self-learning ability, Peking Union Medical College established a multimedia morphological teaching website from 2013 including human anatomy, neuroanatomy, histology and embryology.Methods According to the teaching demand, the use of the ASP script, combined with Mysql database completed the website development, from the interface design to the curriculum, the syllabus, presentations and laboratory videos uploading.Results Through the questionnaire survey, 45% of the students use website more than 3 times a week, and course content column has the highest use frequency (79%).An independent learning platform effect has been achieved.Conclusions After nearly 4 years exploration and practice, multimedia website has become an important part of morphological courses, as a kind of new teaching mode, not only popular for college teachers and students, but also widely used in clinical teaching.

A highly sensitive, rapid and selective liquid chromatography-tandem mass spectrometry(LC-MS/MS) method for the quantitative determination of retinamido-ester in rat plasma was developed and validated. A simplified protein precipitation with acetonitrile was employed for the sample preparation.The separation was carried out on an Agilent TC C18 column ( 150 mm×4. 6 mm ID, 5 μm particle size)with the mobile phase consisted of methanol-water-formic acid (93 : 7 : 0.1). Simvastatin was used as internal standard. The detection was performed on a trap-quadrupele tandem mass spectrometer by selected reaction monitoring (SRM) scan mode via atmospheric pressure chemical ionization (APCI). The range of and inter-day precision values were between 95.97% and 104. 43%, and RSD was between 4. 63% and 10. 69%, respectively. This method was applied to determine the pharmacokinetic parameters. The main pharmacokinetic parameters of retinamido-ester after oral administration via gastric gavage of 2. 5, 5, 10mg·kg-1 were as follows,T1/2;(11.28±7.23),(8.90±3.82),(8.01±5.56)h; AUC0-∞:(103.41±61.46),(190.23±74.99),(421.66±299.20)ng·h·mL-1;MRT:(6.31±0.75),(5.98±0.71), (6.18±0.97) h; CL/F: (30. 10 ± 13.67), (29.58±10.59), (31.18 ±17.51)L·h-1·kg-1;Vd/F:(414.94±159.82),(356.16±139.85),(369.28±322.73)L·kg-1,respectively.