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Hplc pharmacokinetics

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https://www.readbyqxmd.com/read/28916482/disposition-of-treosulfan-and-its-active-monoepoxide-in-a-bone-marrow-liver-lungs-brain-and-muscle-studies-in-a-rat-model-with-clinical-relevance
#1
Michał Romański, Anna Kasprzyk, Mateusz Walczak, Agnieszka Ziółkowska, Franciszek Główka
For the recent years, the application of treosulfan (TREO)-based conditioning prior to hematopoietic stem cell transplantation (HSCT) has been increasing as an alternative to busulfan-based therapy, especially for patients presenting high risk of developing hepato-, pulmo-, and neurotoxicity. So far, the penetration of TREO and its epoxy-derivatives into central nervous system and aqueous humor of the eye has been investigated. However, lacking knowledge on the compounds distribution into the other key tissues precludes comprehensive understanding and assessment of TREO clinical efficacy and toxicity...
September 12, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28915422/determination-of-hydroxyurea-in-human-plasma-by-hplc-uv-using-derivatization-with-xanthydrol
#2
Tiphaine Legrand, Marie-Georgine Rakotoson, Frédéric Galactéros, Pablo Bartolucci, Anne Hulin
A simple and rapid high performance liquid chromatography (HPLC) method using ultraviolet (UV) detection was developed to determine hydroxyurea (HU) concentration in plasma sample after derivatization with xanthydrol. Two hundred microliters samples were spiked with methylurea (MeU) as internal standard and proteins were precipitated by adding methanol. Derivatization of HU and MeU was immediately performed by adding 0.02M xanthydrol and 1.5M HCl in order to obtain xanthyl-derivatives of HU and MeU that can be further separated using HPLC and quantified using UV detection at 240nm...
September 7, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28911334/slow-release-praziquantel-for-dogs-presentation-of-a-new-formulation-for-echinococcosis-control
#3
Bin Jiang, Xiao-Nong Zhou, Hao-Bing Zhang, Yi Tao, Le-Le Huo, Ni Liu
BACKGROUND: Echinococcosis is a serious, zoonotic, parasitic disease with worldwide distribution. According to a epidemiological survey in 2012 in China, there are 20,000 infected patients and more than 50 million people at the risk. As the dog is the main, definitive host, the Government of China encourages monthly praziquantel treatment of every dog. However, this is difficult to achieve in geographically challenging areas, such as the Tibetan plateau, where there are also many dogs without owners...
September 15, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28903828/pharmacokinetics-of-single-bolus-subcutaneous-cefovecin-in-c57bl-6-mice
#4
Kevin L Sanders, Esperanza Bas, Sherry K Cox, Daniel E Rothen
Because of its extended half-life, cefovecin is a broad-spectrum cephalosporin antibiotic commonly used to treat dermatitis in dogs and cats. A single injection in dogs can yield an effective plasma concentration for as long as 14 d, depending on the strain of Staphylococcus and for as long as 7 d in cats for the treatment of Pasteurella multocida. In the laboratory animal setting, C57BL/6 mice are commonly affected with dermatologic conditions that make these animals unsuitable for experiments. Therefore, we performed this pharmacokinetic study to determine whether cefovecin would be of benefit in mice...
September 1, 2017: Journal of the American Association for Laboratory Animal Science: JAALAS
https://www.readbyqxmd.com/read/28903825/pharmacokinetics-of-single-dose-subcutaneous-meloxicam-injections-in-black-tailed-prairie-dogs-cynomys-ludovicianus
#5
Thomas L Wright, David Eshar, Christina McCullough, Matt Warner, Butch Kukanich
This study evaluated the pharmacokinetic profile of a single dose of meloxicam (1.0 mg/kg) administered subcutaneously (n = 6) or intravenously (n = 2) to black-tailed prairie dogs (Cynomys ludovicianus). Blood was collected immediately before (time 0) and at 0.5, 1, 2, 4, 8, 12 and 24 h after drug administration. Plasma meloxicam concentrations were quantified with HPLC-mass spectrometry, and noncompartmental pharmacokinetic analysis was performed. The peak plasma concentrations, time to peak plasma concentration, and terminal half-life of meloxicam after subcutaneous administration (median [minimum-maximum]) were 4...
September 1, 2017: Journal of the American Association for Laboratory Animal Science: JAALAS
https://www.readbyqxmd.com/read/28902176/pharmacokinetic-and-toxicodynamic-characterization-of-a-novel-doxorubicin-derivative
#6
Samaa Alrushaid, Casey L Sayre, Jaime A Yáñez, M Laird Forrest, Sanjeewa N Senadheera, Frank J Burczynski, Raimar Löbenberg, Neal M Davies
Doxorubicin (Dox) is an effective anti-cancer medication with poor oral bioavailability and systemic toxicities. DoxQ was developed by conjugating Dox to the lymphatically absorbed antioxidant quercetin to improve Dox's bioavailability and tolerability. The purpose of this study was to characterize the pharmacokinetics and safety of Dox after intravenous (IV) and oral (PO) administration of DoxQ or Dox (10 mg/kg) and investigate the intestinal lymphatic delivery of Dox after PO DoxQ administration in male Sprague-Dawley rats...
September 13, 2017: Pharmaceutics
https://www.readbyqxmd.com/read/28891378/in-vitro-inhibition-of-human-ugt-isoforms-by-ritonavir-and-cobicistat
#7
Sara Algeelani, Novera Alam, Md Amin Hossain, Gerd Mikus, David J Greenblatt
1. Ritonavir and cobicistat are pharmacokinetic boosting agents used to increase systemic exposure to other antiretroviral therapies. The manufacturer's data suggests that cobicistat is a more selective CYP3A4 inhibitor than ritonavir. However, the inhibitory effect of ritonavir and cobicistat on human UDP glucuronosyltransferase (UGT) enzymes in Phase II metabolism is not established. This study evaluated the inhibition of human UGT isoforms by ritonavir versus cobicistat. 2. Acetaminophen and ibuprofen were used as substrates to evaluate the metabolic activity of the principal human UGTs...
September 11, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/28871716/the-influence-of-eruca-sativa-arugula-on-pharmacokinetics-of-sildenafil-in-rats
#8
Eyad Mallah, Soadad Saleh, Walid Abu Rayyan, Wael Abu Dayyih, Feras Darwish Elhajji, Mohammed Mima, Riad Awad, Tawfiq Arafat
OBJECTIVES: A drug like Sildenafil is commonly used for the treatment of erectile dysfunction. Eruca sativa is known as a garden plant used in folk medicine to enhance the sexual desire in males. Nevertheless, the interaction of Sildenafil and Eruca sativa was not studied. In the current study, we aimed to examine the influence of Eruca sativa on Sildenafil pharmacokinetics in rats. STUDY DESIGN: A crossover experiment with washout period of two weeks was conducted...
August 5, 2017: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28869873/hplc-ms-ms-method-for-bioavailability-study-of-bruceines-d-e-in-rat-plasma
#9
Farahdina Man, Chee-Yan Choo
Bruceines D and E are quassinoids from seeds of Brucea javanica (L.) Merr. exhibiting hypoglycemia effect. The crude drug is used as a traditional medicine by diabetes patients. The aim of this study is to understand the bioavailability and pharmacokinetics of both the bruceines D & E. A rapid and sensitive HPLC-MS/MS method was developed and validated for the quantification of both quassinoids, bruceines D & E in rat plasma. Both the bruceines D & E were separated with the Zorbax SBC-18 column with gradient elution and mobile phase system of acetonitrile and deionized water with 0...
August 30, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28867721/inhibitory-effect-of-oxethazaine-on-midazolam-metabolism-in-rats
#10
Hokuto Namba, Yuki Nishimura, Norimitsu Kurata, Mariko Iwase, Takahito Hirai, Yuji Kiuchi
There have been few reports concerning to the drug-drug interactions (DDIs) with OTC drugs although an increase in the use of OTC drugs in recent years. This current study was conducted to clarify the DDIs through CYP3A inhibition by oxethazaine (OXZ), an antacid available as an OTC drug. Midazolam (MDZ) was used as a probe drug for CYP3A activity. In an in vivo study, a single oral dose of OXZ (50 mg/kg) was administered to rats 30, 60, or 120 min before oral MDZ administration (15 mg/kg). Serum concentrations of MDZ were analyzed by HPLC, and its pharmacokinetic parameters were compared with a water-treated control group...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28867572/pharmacokinetic-and-pharmacodynamic-interaction-of-hydroalcoholic-extract-of-ocimum-sanctum-with-valproate
#11
Sudhir Chandra Sarangi, Dipesh Joshi, Ritesh Kumar, Thomas Kaleekal, Yogendra Kumar Gupta
For effective control of seizures, antiepileptic drugs (AEDs) are administered at higher dose which is associated with several adverse effects. This study envisaged antiepileptic and neuroprotective potential of Tulsi, a commonly used herb for its immunomodulatory property. The optimal dose of Ocimum sanctum hydroalcoholic extract (OSHE) was determined using maximal electroshock seizure (MES)- and pentylenetetrazol (PTZ)-induced seizure models in Wistar rats (200-250g) after administering OSHE (200-1000mg/kg) orally for 14days...
August 31, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28867378/autologous-fat-transplants-to-deliver-glitazone-and-adiponectin-for-vasculoprotection
#12
William G Sanders, Huan Li, Ilya Zhuplatov, Yuxia He, Seong-Eun Kim, Alfred K Cheung, Jayant Agarwal, Christi M Terry
The insulin sensitizing glitazone drugs, rosiglitazone (ROS) and pioglitazone (PGZ) both have anti-proliferative and anti-inflammatory effects and induce adipose tissue (fat) to produce the vaso-protective protein adiponectin. Stenosis due to intimal hyperplasia development often occurs after placement of arteriovenous synthetic grafts used for hemodialysis. This work was performed to characterize the in vitro and in vivo effects of ROS or PGZ incorporation in fat and to determine if fat/PGZ depots could decrease vascular hyperplasia development in a porcine model of hemodialysis arteriovenous graft stenosis...
September 1, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28865230/withdrawal-of-cefoperazone-with-milk-after-intramammary-administration-in-dairy-cows-prospective-and-retrospective-analysis
#13
A Burmańczuk, T Grabowski, T Błądek, C Kowalski, P Dębiak
The aim of the study was to carry out retrospective and prospective comparative analyses of the pharmacokinetics of CEF after single intramammary (IMM) administration in cows. The prospective study (study A) was conducted on 9 dairy cows of the Polish Black-White race with clinical mastitis during the lactation period. Milk samples were collected at 2, 4, 6, 8, 10, 24, 36, 48, 72 and 84 h after single IMM administration of 250 mg of CEF to one quarter. Drug concentrations in milk samples were determined by HPLC-MS/MS technique and the results of the pharmacokinetic analysis were compared to those obtained in previous studies based on the microbiological (study B) and HPLC-UV methods (study C and D)...
March 1, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28859122/effects-of-arachidonyl-2-chloroethylamide-acea-on-the-protective-action-of-various-antiepileptic-drugs-in-the-6-hz-corneal-stimulation-model-in-mice
#14
Jarogniew J Luszczki, Pawel Patrzylas, Miroslaw Zagaja, Marta Andres-Mach, Katarzyna Zaluska, Maria W Kondrat-Wrobel, Monika Szpringer, Jaroslaw Chmielewski, Magdalena Florek-Luszczki
Accumulating evidence indicates that cannabinoid CB1 receptor ligands play a pivotal role in seizures, not only in preclinical studies on animals, but also in clinical settings. This study was aimed at characterizing the influence of arachidonyl-2'-chloroethylamide (ACEA-a selective cannabinoid CB1 receptor agonist) co-administered with phenylmethylsulfonyl fluoride (PMSF) on the anticonvulsant potency of various antiepileptic drugs (clobazam, lacosamide, levetiracetam, phenobarbital, tiagabine and valproate) in the 6-Hz corneal stimulation model...
2017: PloS One
https://www.readbyqxmd.com/read/28854403/an-hplc-ms-ms-method-for-quantitation-of-gly-mca-in-mouse-plasma-application-to-a-pharmacokinetic-study
#15
Jia Liu, Guan Lian, Ting Wang, Yuanheng Ma, Junto Zhou, Changtao Jiang, Yuxin Yin
A simple, sensitive and rapid method using high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was developed and validated for quantification of glycine-β-muricholic acid (Gly-MCA) in mouse plasma for the first time. Plasma samples were pretreated with protein precipitation. The analyte and internal standard were separated on a Shimadzu Shim-pack XR-ODS column (4.6×50mm, 2.2μm) using 0.1% formic acid-water-methanol as mobile phase, with a runtime of 5min. Detection was performed using negative ion electrospray tandem mass spectrometry via multiple reaction monitoring (MRM) scan mode...
August 12, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28840700/-pharmacokinetics-pharmacodynamics-correlation-of-protocatechuic-aldehyde-and-hydroxysafflor-yellow-a-alone-or-their-combination-use-in-rats-with-hyperlipidemia
#16
Hong-Jing Fan, Li Yu, Wei-Feng Jin, Min Li, Jing Zhou, Xiao-Hong Li, Yu-Yan Zhang
To study the pharmacokinetics-pharmacodynamics correlation of protocatechuic aldehyde and hydroxysafflor yellow A alone or their combination use in rats with hyperlipidemia. In this study, the hyperlipidemia model was established by intravenous injection of protocatechuic aldehyde (20 mg•kg⁻¹) and hydroxysafflor yellow A (12 mg•kg⁻¹). The HPLC-DAD method was applied to determine the plasma concentration of protocatechuic aldehyde and hydroxysafflor yellow A at different time points and draw the drug effect-time curve...
July 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28833320/investigation-on-pharmacokinetics-tissue-distribution-and-excretion-of-schisandrin-b-in-rats-by-hplc-ms-ms
#17
Zhuo Wang, Linjun You, Yan Chen, Kaiyong Hu, Zhanbo Wang, Yanan Cheng, Jin Yang, Yong Yang, Guangji Wang
Schisandrin B has received great attention owing to its various biological activities recently. The present study was aimed at the formulation development of schisandrin B and investigating the pharmacokinetic profiles, distribution and excretion of schisandrin B in Sprague-Dawley rats. In this study, micronized schisandrin B particles with particle size of 10~20μm were chosen as the research object. Chromatographic separation was carried out on a BDS HYPERSIL C18 column (50×2.1 mm, I.D. 3.5 μm). Schisandrin B and deoxyschizandrin (internal standard, IS) were detected without interference in the multiple reaction monitoring (MRM) mode with positive electrospray ionization...
August 22, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28827023/can-saliva-and-plasma-methadone-concentrations-be-used-for-enantioselective-pharmacokinetic-and-pharmacodynamic-studies-in-patients-with-advanced-cancer
#18
Rani George, Alison Haywood, Phillip Good, Stefanie Hennig, Sohil Khan, Ross Norris, Janet Hardy
PURPOSE: Methadone is a potent analgesic used to treat refractory cancer pain. It is administered as a racemic mixture, with the l-enantiomer being primarily a μ-receptor agonist, whereas the d-enantiomer is an N-methyl-d-aspartate antagonist and inhibits serotonin and norepinephrine reuptake. Dose requirements vary greatly among patients to achieve optimal pain control and to avoid the risk of adverse effects. The relationship between plasma and saliva methadone enantiomer concentrations was investigated to determine if saliva could be a substitute for plasma in pharmacodynamic and pharmacokinetic studies for clinical monitoring and dose optimization of methadone in patients with advanced cancer...
August 18, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/28815733/comparison-of-the-pharmacokinetic-profiles-of-two-different-amphotericin-b-formulations-in-healthy-dogs
#19
B Bingöl, T Bakirel
This study was conducted to compare the pharmacokinetic profiles of conventional (Fungizone(®) ) and liposomal amphotericin B (AmBisome(®) ) formulations in order to predict their therapeutic properties, and evaluate their potential differences in veterinary treatment. For this purpose, twelve healthy mixed breed dogs received both drugs at a dose of 0.6 mg/kg by intravenous infusion over a 4-min period in a total volume of 40 ml. Blood samples were collected at 0, 0.5, 1, 1.5, 2, 3, 4, 8, 12, 24, 48, 72 and 96 hr after dosing, and concentrations of drug in plasma were determined by high-performance liquid chromatography (HPLC)...
August 16, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28814794/increased-body-exposure-to-new-anti-trypanosomal-through-nanoencapsulation
#20
Renata Tupinambá Branquinho, Gwenaelle Pound-Lana, Matheus Marques Milagre, Dênia Antunes Saúde-Guimarães, José Mário Carneiro Vilela, Margareth Spangler Andrade, Marta de Lana, Vanessa Carla Furtado Mosqueira
Lychnopholide, a lipophilic sesquiterpene lactone, is efficacious in mice at the acute and chronic phases of Chagas disease. Conventional poly-ε-caprolactone (PCL) and long-circulating poly(D,L-lactide)-block-polyethylene glycol (PLA-PEG) nanocapsules containing lychnopholide were developed and characterized. Lychnopholide presented high association efficiency (>90%) with the nanocapsules. A new, fast and simple HPLC-UV-based bioanalytical method was developed, validated in mouse plasma and applied to lychnopholide quantification in in vitro release kinetics and pharmacokinetics...
August 16, 2017: Scientific Reports
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