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Hplc pharmacokinetics

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https://www.readbyqxmd.com/read/29155707/optimized-lc-ms-ms-method-for-the-high-throughput-analysis-of-clinical-samples-of-ivacaftor-its-major-metabolites-and-lumacaftor-in-biological-fluids-of-cystic-fibrosis-patients
#1
Elena K Schneider, Felisa Reyes-Ortega, Jian Li, Tony Velkov
Defects in the cystic fibrosis trans-membrane conductance regulator (CFTR) are the cause of cystic fibrosis (CF), a disease with life-threatening pulmonary manifestations. Ivacaftor (IVA) and ivacaftor-lumacaftor (LUMA) combination are two new breakthrough CF drugs that directly modulate the activity and trafficking of the defective CFTR-protein. However, there is still a dearth of understanding on pharmacokinetic/pharmacodynamic parameters and the pharmacology of ivacaftor and lumacaftor. The HPLC-MS technique for the simultaneous analysis of the concentrations of ivacaftor, hydroxymethyl-ivacaftor, ivacaftor-carboxylate, and lumacaftor in biological fluids in patients receiving standard ivacaftor or ivacaftor-lumacaftor combination therapy has previously been developed by our group and partially validated to FDA standards...
October 15, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29152313/pharmacokinetic-profile-and-partitioning-in-red-blood-cells-of-romifidine-after-single-intravenous-administration-in-the-horse
#2
Noemi Romagnoli, Khaled M Al-Qudah, Sara Armorini, Carlotta Lambertini, Anna Zaghini, Alessandro Spadari, Paola Roncada
The aims of this study were to assess the plasma concentrations of romifidine in horses after intravenous injection, to evaluate the red blood cell (RBC) partitioning of the anaesthetic drug, and to improve knowledge regarding its sedative effect in horses describing the pharmacokinetic model. Eight adult Standardbred horses received a single bolus of romifidine at a dosage of 100 μg/kg. Blood samples (5 mL) were collected immediately before romifidine administration (t0), and at 2, 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 90, 105, 120, 150 and 180 min after injection...
November 2017: Veterinary Medicine and Science
https://www.readbyqxmd.com/read/29149702/an-hplc-tandem-mass-spectrometry-for-quantification-of-et-26-hcl-and-its-major-metabolite-in-plasma-and-application-to-a-pharmacokinetic-study-in-rats
#3
Xu Chen, Wensheng Zhang, Sandy Rios, Miriam B Morkos, Xiaoli Ye, Gen Li, Xuehua Jiang, Zhijun Wang, Ling Wang
ET-26-HCl is a new analog of etomidate, a short-acting anesthetic drug, with less adrenal cortex inhibition. The pharmacokinetics of ET-26-HCl in rats needs to be determined for future clinical trials in human subjects. In order to facilitate the pharmacokinetic study, a liquid chromatography based tandem mass spectrometric (HPLC-MS/MS) method was developed and validated for quantification of ET-26-HCl and its major metabolite, ET-26-acid. These two compounds and gabapentin (internal standard) were extracted using a protein precipitation method with methanol and detected by Multiple Reaction Monitoring of m/z transition of 275...
November 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29148050/the-pharmacokinetics-of-morphine-and-codeine-in-human-plasma-and-urine-after-oral-administration-of-qiangli-pipa-syrup
#4
Bin-Bin Guo, Yu-Qiao Zhang, Sheng-Feng Wang, Jin-Song Ding, Wen-Hu Zhou
Papaveris pericarpium, a natural source of morphine and codeine, is the principal active component in many antitussive traditional Chinese medicines. We herein report the first PK study of papaveris pericarpium in human plasma and urine following oral administration of single (15, 30, 60 mL) and multiple dose (15 mL) of Qiangli Pipa Syrup (MOR 0.1 mg/mL, COD 0.028 mg/mL) by monitoring morphine and codeine using a HPLC-MS/MS method. Their Tmax and t1/2 values are independent of dosages, while the AUC0-t linearly increased with higher dosages, indicating linear PK characteristics...
November 17, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/29139145/pharmacokinetic-assessment-of-the-monepantel-plus-oxfendazole-combined-administration-in-dairy-cows
#5
M Ballent, P Viviani, F Imperiale, P Dominguez, S Halwachs, H Mahnke, W Honscha, C Lanusse, G Virkel, A Lifschitz
Monepantel (MNP) is a novel anthelmintic compound launched into the veterinary pharmaceutical market. MNP is not licenced for use in dairy animals due to the prolonged elimination of its metabolite monepantel sulphone (MNPSO2 ) into milk. The goal of this study was to evaluate the presence of potential in vivo drug-drug interactions affecting the pattern of milk excretion after the coadministration of the anthelmintics MNP and oxfendazole (OFZ) to lactating dairy cows. The concentrations of both parent drugs and their metabolites were measured in plasma and milk samples by HPLC...
November 15, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29133214/antibacterial-activity-and-pharmacokinetic-profile-of-a-promising-antibacterial-agent-14-o-4-amino-6-hydroxy-pyrimidine-2-yl-thioacetyl-mutilin
#6
Ruofeng Shang, Yunpeng Yi, Chao Zhang, Yunxing Fu, Jianping Liang, Wanxia Pu
A new pleuromutilin derivative, 14-O-[(4-Amino-6-hydroxy-pyrimidine-2-yl)thioacetyl] mutilin (APTM), has been synthesized and proved most potent antibacterial agent in in vitro assays, suggesting that further development of this compound may lead to a promising antibacterial drug. In this study, we further evaluated the cytotoxicity, antibacterial efficacy and the pharmacokinetic profile of APTM. In BRL 3A cells, 50% of viability was obtained when 363μg/mL of APTM was used, while retapamulin and tiamulin fumarate needed 49 and 28μg/mL, respectively, to reach this viability...
November 10, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29126988/morinda-officinalis-how-a-comprehensive-review-of-traditional-uses-phytochemistry-and-pharmacology
#7
REVIEW
Jian-Hua Zhang, Hai-Liang Xin, Yue-Ming Xu, Yi Shen, Yu-Qiong He, Hsien-Yeh, Bing Lin, Hong-Tao Song, Juan-Liu, Hai-Yue Yang, Lu-Ping Qin, Qiao-Yan Zhang, Juan Du
ETHNOPHARMACOLOGICAL RELEVANCE: The medicinal plant Morinda officinalisHow. (MO) and its root have long been used in traditional medicines in China and northeast Asia as tonics for nourishing the kidney, strengthening the bone and enhancing immunofunction in the treatment of impotence, osteoporosis, depression and inflammatory diseases such as rheumatoid arthritis and dermatitis. AIM OF THE REVIEW: This review aims to sum up updated and comprehensive information about traditional usage, phytochemistry, pharmacology and toxicology of MO and provide insights intopotential opportunities for future research and development of this plant...
November 7, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29118984/clinical-trial-protocol-for-tardox-a-phase-i-study-to-investigate-the-feasibility-of-targeted-release-of-lyso-thermosensitive-liposomal-doxorubicin-thermodox%C3%A2-using-focused-ultrasound-in-patients-with-liver-tumours
#8
Paul C Lyon, Lucy F Griffiths, Jenni Lee, Daniel Chung, Robert Carlisle, Feng Wu, Mark R Middleton, Fergus V Gleeson, Constantin C Coussios
Background: TARDOX is a Phase I single center study of ultrasound triggered targeted drug delivery in adult oncology patients with incurable liver tumours. This proof of concept study is designed to demonstrate the safety and feasibility of targeted drug release and enhanced delivery of doxorubicin from thermally sensitive liposomes (ThermoDox®) triggered by mild hyperthermia induced by focused ultrasound in liver tumours. A key feature of the study is the direct quantification of the doxorubicin concentration before and after ultrasound exposure from tumour biopsies, using high performance liquid chromatography (HPLC)...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/29113503/effects-of-crystalline-state-and-self-nanoemulsifying-drug-delivery-system-snedds-on-oral-bioavailability-of-the-novel-anti-hiv-compound-6-benzyl-1-benzyloxymethyl-5-iodouracil-in-rats
#9
Ying-Yuan Lu, Wen-Bing Dai, Xin Wang, Xiao-Wei Wang, Jun-Yi Liu, Pu Li, Ya-Qing Lou, Chuang Lu, Qiang Zhang, Guo-Liang Zhang
The objective of this study was to investigate the effect of crystalline state and a formulation of self-nanoemulsifying drug delivery system (SNEDDS) on oral bioavailability of 6-benzyl-1-benzyloxymethyl-5-iodouracil (W-1), a novel non-nucleoside reverse transcriptase inhibitor, in rats. The crystalline states of W-1 were characterized by scanning electron microscope (SEM), differential scanning calorimetry (DSC) and X-ray powder diffraction (XRPD). The SNEDDS was formulated by medium-chain lipids, characterized by droplet particle size...
November 8, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29111492/liquid-chromatography-electrospray-ionization-tandem-mass-spectrometry-method-for-quantitative-estimation-of-new-imiqualine-leads-with-potent-anticancer-activities-in-rat-and-mouse-plasma-application-to-a-pharmacokinetic-study-in-mice
#10
Adrien Chouchou, Bénédicte Marion, Christine Enjalbal, Céline Roques, Pierre Cuq, Pierre-Antoine Bonnet, Françoise M M Bressolle-Gomeni, Carine Deleuze-Masquéfa
Imidazoquinoxaline derivatives (imiqualines) are a new series of anticancer compounds. Two lead compounds (EAPB0203 and EAPB0503) with remarkable in vitro and in vivo activity on melanoma and T-cell lymphomas have been previously identified. The modulation of the chemical structure of the most active compound, EAPB0503, has led to the synthesis of two compounds, EAPB02302 and EAPB02303, 7 and 40 times more active than EAPB0503 against A375 human melanoma cancer cell line, respectively. The aim of this study was to develop and validate a sensitive and accurate liquid chromatography-electrospray ionization-tandem mass spectrometry method to simultaneously quantify EAPB02303 and its potential active metabolite, EAPB02302, in rat and mouse plasma...
October 24, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29105796/penetration-and-pharmacokinetics-of-non-steroidal-anti-inflammatory-drugs-in-rat-prostate-tissue
#11
Venkata K Yellepeddi, Jayashree Radhakrishnan, Rajan Radhakrishnan
BACKGROUND: Chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) involves inflammation of the prostate and affects the quality of life of men of all ages. It is well reported in clinical studies that the treatment for CP/CPPS using nonsteroidal anti-inflammatory drugs (NSAIDs) produced favorable outcomes. However, currently, there are no guidelines on choice of the NSAIDs for the treatment of CP/CPPS. Therefore, in the current research study, we evaluated the prostate tissue penetration of four NSAIDs in rats to provide guidance on choice of NSAIDs for the treatment of CP/CPPS...
November 6, 2017: Prostate
https://www.readbyqxmd.com/read/29105638/development-validation-of-reversed-phase-hplc-method-for-quantification-of-water-insoluble-api
#12
Riffat Yasmin, Muhammad Harris Shoaib, Iyad Naeem Muhammad, Lubna Bashir, Shazia Naz, Huma Ali, Farya Zafar, Fahad Siddiqui
In the present work a specific, accurate, precise, and reproducible UV-HPLC method was developed and validated for the analysis of Aceclofenac. This method involved elution of Aceclofenac in a mobile phase which is composed of buffer pH 6.8 (i.e. using 0.01N KH2PO4) and HPLC grade Acetonitrile (60:40). Separation of the analyte was achieved using HPLC isocratic pump attached to the UV-VIS detectorC18, guard column and C18 column. The injection volume was 20μL, detected at 274 nm; flow rate: 1mL/min. Standard calibration curve was measured and found linear from 0...
September 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29103851/interaction-of-p-synephrine-on-the-pharmacodynamics-and-pharmacokinetics-of-gliclazide-in-animal-models
#13
Leela Krishna Vatsavai, Eswar Kumar Kilari
BACKGROUND: Type 2 diabetes is frequently seen in patients suffering from obesity. p-Synephrine and gliclazide are widely used medicines for the treatment of obesity and diabetes, respectively. Based on the relationship between obesity and diabetes, the present study was undertaken to determine the potential for herb-drug interactions between p-synephrine and gliclazide. METHODS: Influence of p-synephrine on the activity of gliclazide was determined by conducting single and multiple dose interaction studies in animal models...
November 3, 2017: Journal of Ayurveda and Integrative Medicine
https://www.readbyqxmd.com/read/29101819/simultaneous-quantification-of-five-biflavonoids-in-rat-plasma-by-lc-esi-ms-ms-and-its-application-to-a-comparatively-pharmacokinetic-study-of-selaginella-doederleinii-hieron-extract-in-rats
#14
Bing Chen, Xuewen Wang, Yulian Zou, Weiying Chen, Gang Wang, Wensong Yao, Peiying Shi, Shaoguang Li, Shilan Lin, Xinhua Lin, Hong Yao
Selaginella doederleinii Hieron is a widely used as folk Chinese medicine for treatment of different cancers. Our previous investigations have confirmed that the total biflavonoids in ethyl acetate extract from S. doederleinii (SDEA) have favorable anticancer potentials. However, the in vivo process of its bioactive ingredients remains unknown. In this paper, a sensitive and reliable method was developed for simultaneous quantification of main five biflavonoids, including amentoflavone, robustaflavone, 2″,3″-dihydro-3',3″-biapigenin, 3',3″-binaringenin and delicaflavone in the ethyl acetate extract of S...
October 24, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29099735/effect-of-pharmacogenetic-markers-of-vitamin-d-pathway-on-deferasirox-pharmacokinetics-in-children
#15
Sarah Allegra, Jessica Cusato, Silvia De Francia, Filomena Longo, Elisa Pirro, Davide Massano, Antonio Piga, Antonio D'Avolio
OBJECTIVES: Patients with β-thalassemia major have extremely low vitamin D levels, owing to reduced intestinal absorption, subicteric tint, and/or iron-induced higher pigmentation. We investigated whether some polymorphisms within the VDR, CYP24A1, CYP27B1, and GC genes could play a role in deferasirox pharmacokinetics in a cohort of pediatric patients. PATIENTS AND METHODS: Eighteen children with β-thalassemia were enrolled. Drug plasma concentrations at the end of dosing interval (Ctrough) and after 0, 2, 4, 6, and 24 h of drug administration were measured by a HPLC-UV method...
November 2, 2017: Pharmacogenetics and Genomics
https://www.readbyqxmd.com/read/29098836/-pharmacokinetics-and-oral-bioavailability-of-palmatine-and-jatrorrhizine-in-huangteng-in-rats
#16
Jing-Yu Zheng, Guo-Feng Li, Zhong-Mei He, Hong-Yan Zhu, Yan Zhao, Yu-Gang Gao, He Yang, Lian-Xue Zhang
In this study, the total alkaloids of Huangteng were given to the rats by the methods of intragastric administration and tail vein. After the concentration changes of palmatine and jatrorrhizine in the plasma of rats were determined by RP-HPLC, pharmacokinetic parameters and oral bioavailability were calculated by 3P97 software. After the rats were pre-treated with total alkaloid 60 mg•kg⁻¹ by the methods of intragastric administration and tail vein, the main pharmacokinetic parameters were determined as follows: in the intragastric administration group, the Cmax of palmatine and jatrorrhizine were (0...
July 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29096853/plasma-filtration-for-the-controlled-removal-of-liposomal-therapeutics-from-the-apheretic-site-of-view
#17
M Blaha, J Martinkova, M Lanska, S Filip, J Malakova, O Kubecek, J Bezouska, J Spacek
INTRODUCTION: Nanoparticle-based drug delivery systems can overcome the dose-limited toxicity of cytostatics. Pegylated doxorubicin-containing liposomes (PLD) are able to reduce cardiotoxicity. PLD quickly (in 2 days) attains therapeutic concentration in tumorous tissue (kinetic targeting), while its distribution in normal tissue, which is a cause of mucocutaneous toxicity (MCT), is delayed. We examined PLD extracorporeal removal effectivity, using plasma filtration (PF) to determine whether the drug could be withheld prior to its organ distribution responsible for MCT toxicity...
November 2017: Atherosclerosis. Supplements
https://www.readbyqxmd.com/read/29090558/-simultaneous-determination-of-daphnetin-daphnoretin-daphneticin-in-rat-plasma-by-lc-ms-ms-and-its-application-in-pharmacokinetic-study
#18
Yi-Yi-Li-Ge-Qi Hu, Sa-Li Cao, Long-Fei Lin, Jing Fu, Xiao-Xu Dong, Chun-Jing Yang, Miao Zhang, Jian Ni
To establish HPLC-MS/MS method for simultaneous determination of daphnetin, daphnoretin, and daphneticin in rat plasma after oral and intravenous administration of Daphne giraldii extract, and then use them in the calculation of pharmacokinetic parameters. Six sprague-dawley rats received intragastric administration of D. giraldii extract (daphnetin, daphnoretin and daphneticin were 88.40, 3.24 and 4.28 mg•kg⁻¹, respectively). Their drug plasma concentration was determined by LC-MS/MS with schisandrin as an internal standard to draw plasma concentration-time curve...
May 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29090557/-analysis-of-parameters-of-serum-concentration-and-pharmacokinetic-of-liposome-and-aqueous-solution-of-toatal-ginsenoside-of-ginseng-stems-and-leaves-in-rats
#19
Lin Zha, Yan Zhao, Hong-Yan Zhu, En-Bo Cai, Shuang-Li Liu, He Yang, Ying Zhao, Yu-Gang Gao, Lian-Xue Zhang
The experiment was aimed to investigate the difference of plasma concentration and pharmacokinetic parameters between liposome and aqueous solution of toatal ginsenoside of ginseng stems and leaves in rats, such as ginsenosides Rg₁, Re, Rf, Rb₁, Rg₂, Rc, Rb₂, Rb₃, Rd. After intravenous injection of liposome and aqueous solution in rats, the blood was taken from the femoral vein to detect the plasma concentration of the above 9 ginsenoside monomers in different time points by using HPLC. The concentration-time curve was obtained and 3p97 pharmacokinetic software was used to get the pharmacokinetic parameters...
May 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29080828/effects-of-sulfur-fumigation-on-the-pharmacokinetics-metabolites-and-analgesic-activity-of-radix-paeoniae-alba
#20
Ming Kong, Huan-Huan Liu, Jie Wu, Ming-Qin Shen, Zhi-Gang Wang, Su-Min Duan, Yan-Bo Zhang, He Zhu, Song-Lin Li
ETHNOPHARMACOLOGICAL RELEVANCE: Radix Paeoniae Alba (Baishao, BS), one of the most commonly used traditional Chinese medicinal herbs, has many pharmacological effects including analgesic activity. Previous studies found that sulfur-fumigation, a post-harvest handling process developed to prevent mold contamination of medicinal herbs, altered the quality of BS. However, whether sulfur-fumigation affects the pharmacokinetics, safety and efficacy of BS warrants further investigation. AIM OF THE STUDY: To evaluate the feasibility of sulfur-fumigation as a post-harvest handling process of BS from the viewpoints of pharmacokinetics, safety and efficacy...
October 28, 2017: Journal of Ethnopharmacology
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