Predicting Range of Initial Warfarin Dose Based on Pharmacometabolomic and Genetic Inputs.

Anticoagulation response to warfarin during the initial stage of therapy varies among individuals. In this study, we aimed to combine pharmacometabolomic and pharmacogenetic data to predict interindividual variation in warfarin response, and, on this basis, suggest an initial daily dose range. The baseline metabolic profiles, genotypes, and clinical information of 160 patients with heart valve disease served as the variables of the function of the last international normalized ratio measured before a patient's discharge (INR ) to screen for potential biomarkers.

Assessment of polybrominated diphenyl ethers and emerging brominated flame retardants in Pheretima (a Traditional Chinese Medicine): Occurrence, residue profiles, and potential health risks.

China produces and consumes large quantities of brominated flame retardants (BFRs) as well as several other unregulated electronic waste recycling activities, causing high BFR concentrations in the natural environment. Thus, Traditional Chinese Medicines (TCMs) may be contaminated by legacy BFRs (e.g.

Improved liquid chromatography combined with pulsed electrochemical detection for the analysis of etimicin sulfate.

This paper describes an improved liquid chromatography method combined with pulsed electrochemical detection for the analysis of etimicin sulfate. In total, 22 impurities could be separated. A TSK-GEL C18 column (250 mm × 4.

Analysis of micronomicin by liquid chromatography with pulsed electrochemical detection.

This paper describes the separation of the main component micronomicin from its related substances using a new established liquid chromatographic method with pulsed electrochemical detection (LC-PED). The mobile phase consists of 1 volume of acetonitrile and 99 volumes of an aqueous solution containing 1.25% (v/v) trifluoroacetic acid, 0.

Analysis of impurities in vertilmicin sulfate by liquid chromatography ion-trap mass spectrometry.

The characterization of impurities present in vertilmicin by liquid chromatography (LC) coupled with mass spectrometry (MS) is described. A reversed phase (RP)-LC method using a C18 column resistant to basic pH with an alkaline (pH 11) aqueous mobile phase was developed and coupled to MS with an electrospray ionization (ESI) source in the positive ion mode which provides MS(n) capability. In total, 18 impurities were detected in a commercial sample.

Impurity profiling of micronomicin sulfate injection by liquid chromatography-ion trap mass spectrometry.

The characterization of impurities present in micronomicin sulfate injection by liquid chromatography (LC) coupled with mass spectrometry (MS) is described. A reversed phase (RP)-LC method using a C₁₈ column resistant to an alkaline (pH 11) aqueous mobile phase was developed and coupled to MS with an electrospray ionization (ESI) source in the positive ion mode which provides MS(n) capability. A total of thirty six impurities were detected in commercial samples: five impurities were identified by comparison of their fragmentation patterns with those of available related substances, eleven of them were identified in accordance with relevant literature, while the other twenty impurities were newly identified using the MS/MS spectra of the available related reference substances as interpretative templates combined with knowledge of the nature of functional group fragmentation behaviors.

Impurity profiling of etimicin sulfate by liquid chromatography ion-trap mass spectrometry.

A reversed phase (RP)-LC method using a C(18) column resistant to basic pH and an alkaline (pH 10) aqueous mobile phase was developed and coupled to MS with an electrospray ionization (ESI) source in the positive ion mode which provides MS(n) capability. In total, 26 impurities were detected in a commercial sample. The structures of the impurities were proposed based on comparison of their fragmentation patterns with those of the available reference substances, the synthetic route and literature data.

[Pharmacokinetics of fangchinoline and tetrandrine in rats].

Objective: To investigate the pharmacokinetics profile of fangchinoline and tetrandrine in rats after administration of single compound and mixture with other intergradient in traditional prescription.

Method: A method for determination of fangchinoline and tetrandrine in rat plasma by using HPLC-MS has been developed and validated. The pharmacokinetics of two compounds and two compounds in the effective component group (ECG) of Xiaoxuming decoction were compared.

[Study on LC-MS fingerprint for quality assessment of Aristolochia manshuriensis with chemical pattern recognition].

Objective: To analyze LC-MS fingerprints of Aristolochia manshuriensis for quality assessment with two different chemical pattern recognition models.

Method: LC-MS fingerprints of A. manshuriensis were established from 24 batches of samples from different habitats.

Gas chromatography/time-of-flight mass spectrometry based metabonomic approach to differentiating hypertension- and age-related metabolic variation in spontaneously hypertensive rats.

Metabonomics is a systematic approach to the study of in vivo metabolic profiles and therefore allows deep insight into and a better understanding of the pathogenesis of disease. To characterize the development of hypertension, a hypertensive animal model, the spontaneously hypertensive rat (SHR), and its normotensive control, the Wistar Kyoto (WKY) rat, were investigated and their blood plasma analyzed using the high-throughput metabolomic tool, gas chromatography/time-of-flight mass spectrometry (GC/TOFMS). A total of 187 peaks were quantitatively determined after deconvolution, and 78 of them were identified.

[Application of HPLC-ESI-ITMS in the quality control of carboxyterminal sequence confirmation for insulin and insulin chain B].

Application of HPLC-ESI-ITMS in the quality control of carboxyterminal sequence confirmation for insulin and insulin chain B was studied. The solution of intact insulin or insulin chain B was added to the solution of carboxypeptidase P (CPP) and carboxypeptidase Y (CPY). Fractions of appropriate volume were removed at some appointed time points, acidified with the same amount of 1% formic acid to stop the digestion, and then briefly vortexed for HPLC-ESI-ITMS analysis.