Simultaneous determination of amlodipine and bisoprolol in rat plasma by a liquid chromatography/tandem mass spectrometry method and its application in pharmacokinetic study.

A sensitive, specific liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was established for the quantitative determination of amlodipine and bisoprolol, using clenbuterol as the internal standard (IS). The analytes and IS were isolated from 100μL plasma samples by a simple liquid-liquid extraction (LLE). Reverse-phase high performance liquid chromatography (RP-HPLC) separation was accomplished on a Diamonsil C(18) column (50mm×4.

Bioequivalence and population pharmacokinetic modeling of two forms of antibiotic, cefuroxime lysine and cefuroxime sodium, after intravenous infusion in beagle dogs.

To investigate the bioequivalence and the population pharmacokinetics of cefuroxime lysine and cefuroxime sodium in healthy beagle dogs. A randomized 2-period crossover design in 18 healthy beagle dogs after receiving 20, 40, and 80 mg/kg of cefuroxime lysine or cefuroxime sodium was conducted. A 3-compartment open model was used as the basic model for the population pharmacokinetic study.

Simultaneous determination of active flavonoids and alkaloids of Tang-Min-Ling-Pill in rat plasma by liquid chromatography tandem mass spectrometry.

A rapid, sensitive and reliable liquid chromatography tandem mass spectrometry (LC-MS/MS) method was developed and validated for simultaneous determination of five active flavonoids (wogonin, chrysin, oroxylin A, naringenin, hesperetin) and four major alkaloids (berberine, coptisine, jatrorrhizine, palmatine) from Tang-Min-Ling-Pill in rat plasma. Plasma samples (100 μL) were spiked with internal standards daidzein (for flavonoids) and tetrahydropalmatine (for alkaloids), acidified with HCl and extracted by liquid-liquid extraction with acetone. Chromatographic separation was performed on a Zorbax SB-C(18) column with the mobile phase of water (containing 0.

Hollow fiber-based liquid membrane microextraction combined with high-performance liquid chromatography for extraction and determination of trimetazidine in human plasma.

A hollow fiber-based liquid phase microextraction strategy combined with high-performance liquid chromatography was evaluated for the quantitative determination of trimetazidine in human plasma. Trimetazidine was extracted from a 2.1 mL basified plasma sample (donor phase) into the organic solvent (n-octanol) impregnated in the pores of a hollow fiber and then extracted into an acidic solution (acceptor phase) inside the lumen of the hollow fiber.

Identification and dynamic analysis of the purine alkaloids in rat plasma after oral administration of green tea by liquid chromatography hybrid ion trap time-of-flight mass spectrometry.

A liquid chromatography hybrid ion trap time-of-flight mass spectrometric (LC-IT-TOF-MS) method was developed and validated for identification and simultaneous determination of the potential bioactive components from green tea in rat plasma. The plasma samples were extracted by liquid-liquid extraction with ethyl acetate and separated on Shim-pack XR-ODS II column by a gradient elution within a runtime of 8.0 min.

[UPLC characteristic chromatographic profile of Poria].

To establish a UPLC characteristic chromatographic profile analysis method to quickly assess Poria quality and provide basis fro controlling Poria quality. The UPLC characteristic chromatographic profiles of fifteen batches of Poria were determined by ACQUITY UPLC, with HSS T3 Column (2.1 mm x 100 mm, 1.

Comparison of the effects of Mylabris and Acanthopanax senticosus on promising cancer marker polyamines in plasma of a Hepatoma-22 mouse model using HPLC-ESI-MS.

A simple and sensitive method for the simultaneous determination of plasma concentrations of five polyamines in normal and Hepatoma-22 mice, and mice treated with Mylabris and Acanthopanax senticosus was developed by HPLC-ESI-MS. Male Kunming mice were divided into nine groups, a control group (inoculation without treatment), a positive group (Cyclophosphamide), treatment groups [Mylabris (4, 8, 16 mg/kg), Acanthopanax senticosus (6, 12, 24 g/kg)] and a normal group (without inoculation). Twenty-four hours after the last administration, plasma samples were collected.

Simultaneous determination of baicalin, wogonoside, baicalein, wogonin, oroxylin A and chrysin of Radix scutellariae extract in rat plasma by liquid chromatography tandem mass spectrometry.

A liquid chromatography tandem mass spectrometry (LC-MS/MS) method was developed for the simultaneous determination of baicalin, wogonoside, baicalein, wogonin, oroxylin A and chrysin in rat plasma, using naringin as an internal standard. After acidifying with HCl, plasma samples were pretreated by liquid-liquid extraction with acetone. Chromatographic separation was accomplished on a Hypersil Gold-C(18) analytical column (2.

Metabonomic study of genkwa flos-induced hepatotoxicity and effect of herb-processing procedure on toxicity.

A urinary metabonomic approach based on ultraperformance liquid chromatography coupled with mass spectrometry (UPLC-MS) was developed to study the metabolic disturbances caused by the administration of Genkwa Flos (GF) to rats. Potential biomarkers of GF-induced toxic effects were screened out and identified, and the underlying toxicological mechanism as well as the detoxification of vinegar-processing procedure on this herb was discussed. Urine samples were analyzed by the established UPLC-MS method.

Development of an LC-MS method for determination of three active constituents of Shuang-huang-lian injection in rat plasma and its application to the drug interaction study of Shuang-huang-lian freeze-dried powder combined with levofloxacin injection.

A sensitive and specific high performance liquid chromatography coupled with mass spectrometric (LC-MS) method was developed and validated for the simultaneous determination of three main active constituents of Shuang-huang-lian injection with and without the combination use of levofloxacin injection in rat plasma. After addition of the internal standard rutin, plasma samples were protein precipitated with acetonitrile, the chromatographic separation was achieved on a Kromasil C₁₈ column (250 mm × 4.6 mm, 5 μm), using a gradient mobile phase system of acetonitrile-water containing 0.

[Mass spectrometry technology and its application in analysis of biological samples].

With the excellent merits of wide analytical range, high sensitivity, small sample size, fast analysis speed, good repeatability, simple operation, low mobile phase consumption, as well as its capability of simultaneous isolation and identification, etc, mass spectrometry techniques have become widely used in the area of environmental science, energy chemical industry, biological medicine, and so on. This article reviews the application of mass spectrometry technology in biological sample analysis in the latest three years with the focus on the new applications in pharmacokinetics and bioequivalence, toxicokinetics, pharmacokinetic-pharmacodynamic, population pharmacokinetics, identification and fragmentation pathways of drugs and their metabolites and metabonomics to provide references for further study of biological sample analysis.

Pharmacokinetic analysis of alpha and beta epimers of glycyrrhetinic acid in rat plasma: differences in singly and combined administrations.

An HPLC method for the determination of 18alpha-glycyrrhetinic acid and 18beta-glycyrrhetinic acid in rat plasma was established, which was used subsequently to determine the pharmacokinetic profiles of both epimers of glycyrrhetinic acid in rats. alpha-glycyrrhetinic acid, beta-glycyrrhetinic acid, and a mixture of alpha-glycyrrhetinic and beta-glycyrrhetinic acids were administered to rats via gastric infusion. Blood samples were collected at different time intervals and extracted by liquid-liquid extraction.

Determination of imidol hydrochloride in human plasma and urine by high-performance liquid chromatography-tandem mass spectrometry and its application to clinical pharmacokinetic study.

Imidol hydrochloride is a novel drug for the treatment of hepatitis B virus infection. A simple, special and sensitive solid-phase extraction liquid chromatography–tandem mass spectrometry method for determination of imidol in human plasma and urine was developed for the first time and applied to a pharmacokinetic study. The chromatographic separation was achieved on a C₁₈ column (50 x 2.

[UPLC simultaneous determination of five active components in Cinnamomi Ramulus].

A rapid UPLC method for simultaneous determination of protocatechuic acid, coumarin, cinnamic alcohol, cinnamic acid and cinnamaldehyde in Cinnamomi Ramulus was established. The optimal conditions of separation and detection were achieved on an HSS T3 Column (2.1 mm x 100 mm, 1.

[Determination of six lignin components in crude and different processed products of Schisandra chinensis].

Objective: To compare the contents of lignin in crude and processed fruits of Schisandrae chinensis, and to explore the processing mechanism of S. chinensis fruits.

Method: Contents of schisandrin, schisandrol B, deoxyschisandrin, gomisin N, gamma-schizandrin and schisandrin C were determined by high performance liquid chromatography (HPLC).

Development of a UPLC-ESI-MS/MS method for the determination of larotaxel in beagle dog plasma: application to the pharmacokinetic study.

A UPLC-ESI-MS/MS method has been developed and validated for the determination of larotaxel in beagle dog plasma. After addition of the internal standard, plasma samples were extracted by liquid-liquid extraction with methyl tert-butyl ether and separated on a 50×2.1 mm ACQUITY 1.

A fast, sensitive, and high throughput method for the determination of cefuroxime lysine in dog plasma by UPLC-MS/MS.

In order to investigate the preclinical pharmacokinetics of cefuroxime lysine, a fast, sensitive and high throughput UPLC-ESI-MS/MS method has been developed and validated for the quantitative determination of cefuroxime in dog plasma. Cefuroxime and IS phenacetin were extracted from plasma samples by PPT or LLE procedure, and then separated on an ACQUITY UPLC™ BEH C(18) column with an isocratic elution of acetonitrile-0.1% formic acid in 10mM ammonium acetate (40:60, v/v).

Trillin, a steroidal saponin isolated from the rhizomes of Dioscorea nipponica, exerts protective effects against hyperlipidemia and oxidative stress.

Ethnopharmacological Evidence: Numerous efforts have been conducted in searching for effective agents against cardiovascular diseases, in particular from herbal medicines. The rhizome of Dioscorea nipponica (Dioscoreae Nipponicae Rhizoma) is a traditional Chinese herb being prescribed to improve the blood circulation. Here, we identified a steroidal saponin trillin from Dioscorea nipponica, which showed robust anti-hyperlipidemic effects.

Simultaneous determination of seven bioactive components in Oolong tea Camellia sinensis: quality control by chemical composition and HPLC fingerprints.

A simple and reliable method of high-performance liquid chromatography (HPLC) was developed for the quality control of oolong tea (the dry leaves of Camellia sinensis ): the quality control included the HPLC fingerprint and the quantitative determination of seven bioactive compounds chemicals, namely, (-)-gallocatechin, (-)-epigallocatechin, (-)-epigallocatechin gallate, caffeine, (-)-epicatechin, gallocatechin gallate, and (-)-epicatechin gallate. The developed analyses of the chemicals excelled in quantifying the chemicals in oolong tea. The chemical fingerprint of oolong tea was established using the raw materials of three main production sites in China, that is, Fujian (southern and northern parts), Taiwan, and Guangdong.

Simultaneous determination of ten flavonoids from Viscum coloratum grown on different host species and different sources by LC-MS.

A high-performance liquid chromatographic-mass spectrometric method was developed for the simultaneous determination of 10 flavonoids in Viscum coloratum obtained from different host species and different sources. Viscum coloratum was extracted with 50% methanol. The extracts were separated on a C(18) column with a gradient of 0.

Pharmacokinetics and tissue distribution of docetaxel by liquid chromatography-mass spectrometry: evaluation of folate receptor-targeting amphiphilic copolymer modified nanostructured lipid carrier.

A novel amphiphilic copolymer, folate-poly(PEG-cyanoacrylate-co-cholesteryl cyanoacrylate) (FA-PEG-PCHL) was synthesized to modify docetaxel-loaded nanostructured lipid carrier to lead to a long blood circulating effect and targeting ability for the delivery of antitumor drug in cancer. To investigate the characteristics of modified docetaxel-loaded nanostructured lipid carrier in vivo, a liquid chromatography-mass spectrometry method was developed and validated for the determination of docetaxel in rat plasma and tumor-bearing mouse tissue samples. The biosamples were extracted by liquid-liquid extraction method with ether and separated on a C(18) column (150 mm×4.

Simultaneous determination of naringin, hesperidin, neohesperidin, naringenin and hesperetin of Fractus aurantii extract in rat plasma by liquid chromatography tandem mass spectrometry.

A liquid chromatography tandem mass spectrometry (LC-MS/MS) method was developed for the simultaneous determination of naringin, hesperidin, neohesperidin, naringenin and hesperetin in rat plasma, using liquiritin as the internal standard. Plasma samples extracted with a solid-phase extraction procedure were separated on a Zorbax SB-C18 analytical column (2.1 mm × 150 mm, 5 μm) and detected by electrospray ionization (ESI) in multiple reaction monitoring (MRM) mode.

Comparative pharmacokinetics of three triterpene acids in rat plasma after oral administration of Poria extract and its formulated herbal preparation: GuiZhi-FuLing capsule.

A sensitive liquid chromatographic-mass spectrometric technique coupled with liquid-liquid extraction method was developed and validated for simultaneous determination of dehydro-tumulosic acid, tumulosic acid and polyporic acid C in rat plasma. The analytes were separated on a Kromasil C(18) column with a total running time of 12.5 min.

Simultaneous determination of eight active components in Houttuynia cordata injection and its quality control in productive process.

A simple, reliable and effective gas chromatography coupled with flame ionization detection method was developed for the simultaneous determination of eight components (α-pinene, β-pinene, myrcene, limonene, terpinen-4-ol, α-terpineol, bornyl acetate and methyl-n-nonylketone) in Chinese medicine Houttuynia cordata and its injection. The chromatographic separation of all eight components, including undecylene as internal standard was performed on a DB-1 column (30 m×0.25 mm, 0.

A metabonomic analysis of urine from rats treated with rhizoma alismatis using ultra-performance liquid chromatography/mass spectrometry.

A metabonomic approach based on ultra-performance liquid chromatography coupled to mass spectrometry (UPLC/MS) was used to study the nephrotoxicity of rhizoma alismatis (RA) in rats. Potential biomarkers of RA toxicity were identified and the toxicological mechanism is discussed. Urine samples were collected from control and treated rats at various stages and analyzed by UPLC/MS in positive ionization mode.