AIMTo investigate the differences of pharmacokinetic behavior and tissue distribution of nimodipine and its two enantiomers in rats.

METHODSA high-performance liquid chromatographic method with an ODS column (150 mm x 4.6 mm ID) and a mobile phase of methanol-water (70:30) was used for racemic nimodipine assay. Another method with a Chiralcel OJ column (250 mm x 4.6 mm ID) and a mixture of n-haxane-ethanol (85:15) as mobile phase was used to determine its two enantiomers. Nimodipine was monitored at 236 nm wavelength.

RESULTSThe linearity, recoveries and the detection limits of the methods were found to be suitable for the determinations. The average results of within-day and between-day RSDs were 5.64% and 7.85% respectively, the mean recovery was 97.66% for the concentration ranges studied. The pharmacokinetic parameters Tmax, Cmax, AUC and CLs were: S-(-)-nimodipine (2.1 +/- 0.3) h, (197 +/- 5) microgram.L-1, (656 +/- 18) mL.min-1, (0.30 +/- 0.03) microgram.h.L-1, and R-(+)-nimodipine (1.7 +/- 0.5) h, (128 +/- 4) microgram.L-1, (381 +/- 4) mL.min-1, (0.53 +/- 0.03) microgram.h.L-1, respectively. The S-(-)-nimodipine concentration was 2.23 and 1.97 times as high as that of R-(+)-nimodipine in heart and in cerebrum respectively and there was almost only S-(-)-nimodipine in cerebellum. But R-(+)-nimodipine concentration was 1.57, 3.69 and 4.20 times as high as that of S-(-)-nimodipine in major excretion organs such as kidney, spleen and liver respectively.

CONCLUSIONThe experimental results obtained by using the achiral and chiral liquid chromatography showed that the differences between enantiomers were apparent for the pharmacokinetics in rat plasma, and very significant for the distributions in major target tissues: heart, cerebrum and cerebellum, and main elimination tissues: kidney, spleen and liver.

Animals ; Area Under Curve ; Calcium Channel Blockers ; blood ; chemistry ; pharmacokinetics ; Chromatography, High Pressure Liquid ; methods ; Female ; Male ; Nimodipine ; blood ; chemistry ; pharmacokinetics ; Rats ; Stereoisomerism ; Tissue Distribution

Affinity chromatography (AC)is a type of liquid chromatography that makes use of biological-like interactions for separation and specific analysis of bioactive components. It has been widely used as a high-throughput screening method for the separation,screening and purification of the target molecules from complex samples with advantages such as high selectivity and high recovery efficiency.This article summarizes the biological effects of affinity chromatography, molecular imprinting chromatography, and dye ligands affinity chromatography.The review also encompasses the application of AC in the separation of chiral drugs,screening of active components,purification of target protein,and mechanism of the drug-protein interaction.Moreover,the prospects of its applications are also discussed.

Objective To evaluate the value of contrast-enhanced ultrasound (CEUS) in preoperative classification for hilar cholangiocarcinoma. Methods Forty-six patients with 46 hilar cholangiocarcinoma were diagnosed by surgical pathology in Zhongshan Hospital of Fudan University from January 2007 to April 2013. The echogenicity difference on conventinal ultrasound and CEUS were compared with chi-square test. The accuracy of conventinal ultrasound and CEUS for evaluating invaded bile duct, detective rates for portal vein invasion and displaying rate of metastatic hilar lymph nodes were compared with chi-square test or Fisher’s Exact test according to the golden standard of operative exploration. Results On CEUS, 82.6%(38/46) and 91.3%(42/46) hilar cholangiocarcinoma were hypoechoic in portal vein phase and delayed phase respectively, while 63.0%(29/46) hilar cholangiocarcinoma were isoechoic on conventinal ultrasound with vague margin. The clearly displaying rates were 37.0%(17/46), 84.8%(39/46) and 91.3%(42/46) in conventinal ultrasound, portal vein and delayed phase of CEUS and the echogenicity was signiifcantly different. The evaluation accuracy of hilar cholangiocarcinoma invading bile duct was improved from 80.4%(37/46, conventinal ultrasound) to 100%(46/46, CEUS) significantly (χ2=7.882,P=0.005). Portal vein invasion were found in 9 cases during operative exploration and the detective rates on conventinal ultrasound and CEUS were 78%(7/9) and 89%(8/9) without signiifcant difference (P=1.000). Metastatic hilar lymph nodes were found in 8 cases and the displaying rates on conventinal ultrasound and CEUS were the same (75%, 6/8) without signiifcant difference (P=1.000). Conclusions CEUS could signiifcantly improve the clearly displaying rate of hilar cholangiocarcinoma and improve the evaluation accuracy for invaded bile duct comparing with conventinal ultrasound.

In China, traditional Chinese medicines （TCMs） have been used in clinical applications for thousands of years. The successful hyphenation of high-performance liquid chromatography （HPLC） and mass spectrometry （MS） has been applied widely in TCMs and biological samples analysis. Undoubtedly, HPLC/MS technique has facilitated the understanding of the treatment mechanism of TCMs. We reviewed more than 350 published papers within the last 5 years on HPLC/MS in the analysis of TCMs. The present review focused on the applications of HPLC/MS in the component analysis, metabolites analysis, and pharmacokinetics of TCMs etc. 50% of the literature is related to the component analysis of TCMs, which show that this field is the most popular type of research. In the metabolites analysis, HPLC coupled with electrospray ionization quadrupole time-of-flight tandem mass spectrometry has been demonstrated to be the powerful tool for the characterization of structural features and fragmentation behavior patterns. This paper presented a brief overview of the applications of HPLC/MS in the analysis of TCMs. HPLC/MS in the fingerprint analysis is reviewed elsewhere.

Objective To develop a novel strategy for separation and purification of target protein by magnetic molecularly imprinted nanoparticles . Methods Fe3 O4 nanoparticles were synthesized through a hydrothermal method .A sol-gel technique was adopted to prepare imprinting layers .The adsorption capability of magnetic molecularly imprinted nanoparticles was investigated by kinetic , isothermal , and selective binding experiments .Results The imprinted nanomaterials could reach equilibrium within 30 min . The adsorption capacity was 44 .51 mg/g .The imprinting factor and selectivity coefficient were 3 .50 and 2 .92 ,respectively .The resulting imprinted polymers could selectively separate and enrich bovine hemoglobin from a bovine blood sample . Conclusion The prepared imprinted nanomaterials with good specific adsoprtion ability can provide an effective strategy for separation and purification of target protein .

OBJECTIVETo develop a HPLC-ESI-MS method for the determination of puerarin and its metabolite and study the metabolic kinetics in beagle dog liver microsomes.

METHODBeagle dog liver microsomes were prepared by using ultracentrifugation method. Chromatography was performed on a Shimadzu C18 column (2.0 mm x 150 mm, 5 microm). Amethanol-water gradient system was used. ESI interface was applied in the positive, and SIM m/z 417 was puerarin and m/z 531 was daidzein.

RESULTThe puerarin was metabolized by NADPH regenerating system in beagle dog microsomes. The Michaelis-Menten parameters Km and Vmax in beagle dog microsomes were initially estimated by analyzing Lineweave-Brurk plot. The Vmax Km of puerarin were (0.047 +/- 0.006) mg x min(-1) x g(-1), (1.22 +/- 0.53) mg x L(-1).

CONCLUSIONThe puerarin and daidzein can be rapidly determined by HPLC-MS in beagle dog microsomes and the puerarin was metabolized to daidzein by CY P450. The study can give help for Baige capsule.

Animals ; Chromatography, High Pressure Liquid ; Dogs ; Isoflavones ; pharmacokinetics ; Liver ; chemistry ; drug effects ; Microsomes, Liver ; chemistry ; drug effects ; Pharmacokinetics ; Spectrometry, Mass, Electrospray Ionization

OBJECTIVETo screen a variety of Porphyromonas gingivalis (Pg) common outer membrane proteins with two-dimensional liquid phase fractionation (PF2D) and matrix-assisted laser desorption ionization time-of-flight/time-of-flight mass spectrometry (MALDI-TOF/TOF-MS) and provide candidate target antigen for the design of vaccines with cross protection against a variety of Pg.

METHODSThe outer membrane proteins of Pg301, PgATCC33277 and PgW83 were extracted through ultracentrifugation, and then they were separated by ProteomeLab PF2D protein fractionation system. After separation, the outer membrane proteins were obtained through comparison, and the primary structure of the proteins was identified by MALDI-TOF/TOF-MS and database.

RESULTSNinety-nine protein samples out of 3 strains of Pg were obtained after the high performance chromato focusing (HPCF) separation process. B7 fractions of 3 strains of Pg were separated by the reversed-phase high performance liquid chromatography (RP-HPCL) separation process. After comparison of peak and retention time of chromatogram, the 8 common protein peaks of 3 strains of Pg were confirmed. The protein samples were identified by MALDI-TOF/TOF-MS, and one of them was known protein arg-gingipain A.

CONCLUSIONSPF2D protein fractionation system is of good reproducibility and high resolution. A combination of PF2D and MALDI-TOF/TOF-MS can be used to identify the common outer membrane proteins of Pg.

Antigens, Bacterial ; analysis ; Mass Spectrometry ; Membrane Proteins ; analysis ; Porphyromonas gingivalis ; immunology ; Reproducibility of Results ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization ; Vaccines

To analyze the constituents in supercritical fluid CO2 extraction (SFE-CO2) of Radix caulophylli, the Radix caulophylli was extracted with SFE-CO2, and analyzed by gas chromatography-mass spectrometry (GC-MS). The GC-MS analysis with a DB-5MS capillary column (30 mm x 0.32 mm ID, 0.25 microm film thickness) was used. The inlet temperature was maintained at 280 degrees C. The column oven was held at 80 degrees C for 2 min, then programmed from 80 to 280 degrees C at 5 degrees C x min(-1) and, finally, held for 4 min. Helium at a constant flow rate of 2.0 mL x min(-1) was used as the carrier gas. The mass spectrometry conditions were as follows: ionization energy, 70 eV; ion source temperature, 200 degrees C. The mass selective detector was operated in the TIC mode (m/z was from 40 - 500). For the first time 49 peaks were separated and identified, the compounds were quantitatively determined by normalization method, and the identified compounds represent 97.44% of total GC peak areas. Viz, n-hexadecanoic acid (31.4%), (E, E) -9, 12-octadecadienoic acid (26.54%), (Z)-7-tetradecenal (9.4%), hexadecenoic acid (3.23%), 10-undecenal (3.22%), octadecanoic acid (2.25%), and caulophylline (1.76%) etc. The results will provide important foundation for understanding the constituents and further exploitation of Radix caulophylli.
Carbon Dioxide ; Caulophyllum ; chemistry ; Chromatography, Supercritical Fluid ; Gas Chromatography-Mass Spectrometry ; Linoleic Acid ; analysis ; Palmitic Acid ; analysis ; Plant Roots ; chemistry ; Plants, Medicinal ; chemistry

BACKGROUNDThe cellular plasma membrane represents a natural barrier to many exogenous molecules including magnetic resonance (MR) contrast agent. Cell penetrating peptide (CPP) is used to internalize proteins, peptides, and radionuclide. This study was undertaken to assess the value of a new intracellular MR contrast medium, CPP labeled diethylenetriamine pentaacetic acid gadolinium (Gd-DTPA) in molecular imaging in vitro.

METHODSFluorescein-5-isothiocyanate (FITC) and Gd-DTPA respectively labeled with CPP (FITC-CPP, Gd-DTPA-CPP) were synthesized by the solid-phase method. Human hepatic cancer cell line-HepG2 was respectively stained by FITC-CPP and FITC to observe the uptake and intracellular distribution. HepG2 was respectively incubated with 100 nmol/ml Gd-DTPA-CPP for 0, 10, 30, 60 minutes, and imaged by MR for studying the relationship between the incubation time and T(1)WI signal. The cytotoxicity to NIH3T3 fibroblasts cells was measured by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide reduction assay (MTT).

RESULTSThe molecular weights of CPP labeled imaging agents, which were determined by MALDI mass spectrometry (FITC-CPP MW = 2163.34, Gd-DTPA-CPP MW = 2285.99), were similar to the calculated molecular weights. Confocal microscopy suggested HepG2 translocated FITC-CPP in cytoplasm and nucleus independent with the incubation temperature. MR images showed HepG2 uptaken Gd-DTPA-CPP had a higher T(1) weighted imaging (T(1)WI) signal, and that the T(1)WI signal intensity was increasing in a time-dependent manner (r = 0.972, P = 0.001), while the signal intensity between the cells incubated by Gd-DTPA for 60 minutes and the controlled cells was not significantly different (P = 0.225). By MTT, all concentrations from 50 nmol/ml to 200 nmol/ml had no significant (F = 0.006, P = 1.000) effect on cell viability of mouse NIH3T3 fibroblasts, compared with the control group.

CONCLUSIONSThe newly constructed CPP based on polyarginine can translocate cells by carrying FITC and MR contrast agent Gd-DTPA, and the intracellular concentrations are readily detectable by MR imaging, suggesting a new way for MR molecular imaging.

Cell Line, Tumor ; Cell Membrane Permeability ; Contrast Media ; Fluorescein-5-isothiocyanate ; Gadolinium DTPA ; Humans ; Magnetic Resonance Imaging ; methods ; Peptides ; metabolism

BACKGROUNDThe hairpin cell-penetrating peptides (hCPPs) demonstrate an interesting characteristic of conditioned activation by molecules. We hypothesized that hCPPs have the potential to selectively deliver a paramagnetic gadolinium probe into the matrix metalloproteinase 2 (MMP-2) positive human ovary adenocarcinoma cell lines, SKOV-3.

METHODShCPPs were synthesized and labeled with 1,4,7,10-tetraazacyclododecane-N,N',N'',N''' tetraacetic acid gadolinium (III) (Gd-DOTA) and fluorescein isothiocyanate (FITC) by f-moc strategy using a standard solid phase peptide synthesis protocol. MMP-2 expression and activity were demonstrated by reverse transcriptase polymerase chain reaction (RT-PCR) and zymography. Internalization and location of hCPPs in SKOV-3 cells were observed by fluorescein imaging and flow cytometery. Selective delivery of Gd-DOTA in SKOV-3 cells was observed by magnetic resonance imaging (MRI) and transmission electron microscopy (TEM).

RESULTSThe uptake of hCPPs by SKOV-3 cells depended on the activity of MMP-2. T1WI signals of SKOV-3 cells treated with Gd-DOTA-hCPPs suggested the uptake of Gd-DOTA-hCPPs increased in a time- (r = 0.990, P < 0.01) and concentration-dependent manner (r = 0.964, P < 0.001), but was inhibited by a MMP-2 inhibitor. Electron-dense particles observed in the cytoplasm and nucleus by transmission electron microscopy proved the intracellular penetration of gadolinium.

CONCLUSIONShCPPs can be used as an effective vector for an MRI molecular probe to assess the activity of MMP-2.

Cell Line, Tumor ; Cell-Penetrating Peptides ; adverse effects ; chemical synthesis ; chemistry ; metabolism ; Flow Cytometry ; Heterocyclic Compounds ; adverse effects ; chemical synthesis ; chemistry ; metabolism ; Humans ; Magnetic Resonance Imaging ; Matrix Metalloproteinase 2 ; chemistry ; metabolism ; Microscopy, Electron, Transmission ; Organometallic Compounds ; adverse effects ; chemical synthesis ; chemistry ; metabolism ; Reverse Transcriptase Polymerase Chain Reaction