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Journal of Pharmaceutical and Biomedical Analysis

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https://www.readbyqxmd.com/read/28199895/a-rapid-and-robust-uhplc-dad-method-for-the-quantification-of-amphotericin-b-in-human-plasma
#1
Sebastiano Barco, Alessia Zunino, Antonio D'Avolio, Laura Barbagallo, Angelo Maffia, Gino Tripodi, Elio Castagnola, Giuliana Cangemi
Amphotericin B is an antifungal drug widely used in Intensive Care Units. Therapeutic drug monitoring (TDM) of amphotericin B is recommended for the assessment of toxicity surveillance and treatment optimization. In this paper we described the development and validation of a new Ultra High Performance Liquid Chromatography coupled to Diode Array Detection (UHPLC-DAD) method for the quantification of Amphotericin B in 200μL human plasma over a wide range of concentrations (0.125-10mg/L). The new method has been validated following international guidelines on bioanalytical method validation and showed high selectivity, high accuracy and precision and high process efficiency...
February 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28208106/the-impact-of-ion-pairing-reagents-on-the-selectivity-and-sensitivity-in-the-analysis-of-modified-oligonucleotides-in-serum-samples-by-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#2
Sylwia Studzińska, Rafał Rola, Bogusław Buszewski
Present study highlights the usage of various ion-pairing agents and their impact on the process of separation and ionization of oligonucleotides in the fortified human serum samples. What is more, retention studies involved different stationary phases, including: octadecyl, phenyl, pentafluorophenyl groups and ligands with embedded polar groups. It was proved that retention of oligonucleotides strongly depends on the alkyl chain branching in the structure of ion pairing reagent. Furthermore ion-pairing agents build of straight alkyl chain are more easily adsorbed on the stationary phase modified with octadecyl groups, while branching of alkyl chain caused more effective adsorption of studied compounds at phenyl groups compared to octadecyl ones...
February 7, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28196345/comparison-of-bioactive-components-and-pharmacological-activities-of-ophiopogon-japonicas-extracts-from-different-geographical-origins
#3
Min Zhao, Wan-Feng Xu, Han-Yuan Shen, Pei-Qiang Shen, Jun Zhang, Dan-Dan Wang, Han Xu, Hong Wang, Ting-Ting Yan, Lin Wang, Hai-Ping Hao, Guang-Ji Wang, Li-Juan Cao
Ophiopogon japonicus (Linn. f.) Ker-Gawl (O. japonicas), mainly cultivated in Sichuan and Zhejiang province in China, has different bioactive components and therefore their pharmacological activities. To explain the different clinical efficacy of O. japonicas derived preparations, herein we report differences of pharmacological activities between Sichuan and Zhejiang O. japonicas and behind them the exact differences of bioactive components. Based on a LC/MS-IT-TOF method, the differences of bioactive components between Sichuan and Zhejiang O...
February 7, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28213178/the-atypical-excretion-profile-of-meldonium-comparison-of-urinary-detection-windows-after-single-and-multiple-dose-application-in-healthy-volunteers
#4
Christian Görgens, Sven Guddat, Christina Bosse, Hans Geyer, Valentin Pop, Wilhelm Schänzer, Mario Thevis
Following a one-year monitoring program providing unequivocal analytical evidence for a high prevalence in international elite sports, meldonium has been included in the World Anti-Doping Agency's (WADA) list of prohibited substances that came into effect on 1 January 2016. Despite of the polar and hydrophilic nature of the molecule, an unusual long detection window was observed in pilot elimination studies. Consequently, in the present study, urinary excretion profiles after single-dose (5 volunteers, 1×500mg) and multiple-dose oral application (5 volunteers; 2×500mg/day for 6days) were determined in order to facilitate the result management concerning meldonium findings in doping controls...
February 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28196344/identification-characterization-and-in-silico-admet-prediction-of-roflumilast-degradation-products
#5
Mariana S Pinheiro, Gil M Viana, Bárbara de A Abrahim Vieira, Alessandra Mendonça Teles de Souza, Carlos Rangel Rodrigues, Rita de Cássia E E Marins, Lúcio M Cabral, Valéria P de Sousa
The present study reports the degradation behavior of roflumilast (RFL), a new drug developed for the treatment of chronic obstructive pulmonary disease. The degradation of RFL was tested under various stress conditions as per the guidelines of the International Conference on Harmonization. The degradation products (DPs) of RFL were identified, characterized and in silico predictions were made of their pharmacokinetic properties, absorption, distribution, metabolism, excretion and toxicity (ADMET). RFL was subjected to various stress conditions including photodegradation, alkaline and acidic hydrolysis, oxidative and metallic degradation...
February 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28192719/hplc-ms-ms-method-for-the-simultaneous-quantification-of-desmethylmebeverine-acid-mebeverine-acid-and-mebeverine-alcohol-in-human-plasma-along-with-its-application-to-a-pharmacokinetics-study
#6
Natalia E Moskaleva, Pavel A Baranov, Natalia V Mesonzhnik, Svetlana A Appolonova
A new simple, rapid and sensitive high pressure liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was developed and validated for simultaneous analysis of mebeverine metabolites as: mebeverine alcohol (MAL), mebeverine acid (MAC) and desmethylmebeverine acid (DMAC) in human plasma. Sample preparation was performed by protein precipitation following the separation of analytes using an Acquity UPLC BEN C8 column 1.7 mm 2.1×50mm (Waters, USA). (2)H5-desmethylmebeverine acid ((2)H5-DMAC) was used as the internal standard (IS)...
February 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28209350/n-decyl-s-trityl-r-cysteine-a-new-chiral-selector-for-green-ligand-exchange-chromatography-applications
#7
Andrea Carotti, Federica Ianni, Emidio Camaioni, Lucia Pucciarini, Maura Marinozzi, Roccaldo Sardella, Benedetto Natalini
In search for new enantioselectivity profiles, the N-decyl-S-trityl-(R)-cysteine [C10-(R)-STC] was synthesized through a one-step procedure and then hydrophobically adsorbed onto an octadecylsilica surface to generate a stable chiral stationary phase for ligand-exchange chromatography (CLEC-CSP) applications. The CLEC analysis was carried out on underivatized amino acids, by using a Cu(II) sulphate (1.0mM) containing aqueous eluent system. Most of the analysed compounds (34 out of 45) were enantiodiscriminated by the C10-(R)-STC-based CSP, with resolution factor (RS) values up to 8...
February 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28213176/lc-ms-ms-assay-for-the-simultaneous-quantitation-of-the-atm-inhibitor-az31-and-the-atr-inhibitor-azd6738-in-mouse-plasma
#8
Brian F Kiesel, Jeffrey C Shogan, Madani Rachid, Robert A Parise, Frank P Vendetti, Christopher J Bakkenist, Jan H Beumer
The ATM kinase inhibitor AZ31 and ATR kinase inhibitor AZD6738 are in various phases of preclinical and clinical evaluation for their ability to potentiate chemoradiation. To support the preclinical evaluation of their pharmacokinetics, we developed and validated an LC-MS/MS assay for the simultaneous quantification of AZ31 and AZD6738 in mouse plasma. A "dilute and shoot" method was used to precipitate proteins from a sample volume of 50μL. Chromatographic separation was achieved using a Phenomenex Polar-RP column and a gradient mobile phase consisting of methanol-water with 0...
February 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28213175/quantitative-analysis-of-mycosporine-like-amino-acids-in-marine-algae-by-capillary-electrophoresis-with-diode-array-detection
#9
Anja Hartmann, Adele Murauer, Markus Ganzera
Marine species have evolved a variety of physical or chemical strategies to diminish damage from elevated environmental ultraviolet radiation. Mycosporine-like amino acids, a group of widely distributed small water soluble compounds, are biologically relevant because of their photo-protective potential. In addition, presumed antioxidant and skin protective strategies raise the interest for possible medicinal and cosmetic applications. In this study the first CE method for the quantification of mycosporine-like amino acids in marine species is presented...
February 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28214451/a-novel-lc-ms-ms-method-for-the-simultaneous-quantification-of-topiramate-and-its-main-metabolites-in-human-plasma
#10
Daniela Milosheska, Robert Roškar
The aim of the present report was to develop and validate simple, sensitive and reliable LC-MS/MS method for quantification of topiramate (TPM) and its main metabolites: 2,3-desisopropylidene TPM, 4,5-desisopropylidene TPM, 10-OH TPM and 9-OH TPM in human plasma samples. The most abundant metabolite 2,3-desisopropylidene TPM was isolated from patients urine, characterized and afterwards used as an authentic standard for method development and validation. Sample preparation method employs 100μL of plasma sample and liquid-liquid extraction with a mixture of ethyl acetate and diethyl ether as extraction solvent...
February 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28213177/tiered-analytics-for-purity-assessment-of-macrocyclic-peptides-in-drug-discovery-analytical-consideration-and-method-development
#11
Jingfang Jenny Qian Cutrone, Xiaohua Stella Huang, Edward S Kozlowski, Ye Bao, Yingzi Wang, Christopher S Poronsky, Dieter M Drexler, Adrienne A Tymiak
Synthetic macrocyclic peptides with natural and unnatural amino acids have gained considerable attention from a number of pharmaceutical/biopharmaceutical companies in recent years as a promising approach to drug discovery, particularly for targets involving protein-protein or protein-peptide interactions. Analytical scientists charged with characterizing these leads face multiple challenges including dealing with a class of complex molecules with the potential for multiple isomers and variable charge states and no established standards for acceptable analytical characterization of materials used in drug discovery...
February 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28209351/an-indirect-stereoselective-analysis-of-nebivolol-glucuronides-in-plasma-by-lc-ms-ms-application-to-clinical-pharmacokinetics
#12
Carolina Pinto Vieira, Daniel Valente Neves, Evandro José Cesarino, Adriana Rocha, Séverine Poirier, Vera Lucia Lanchote
Nebivolol is a racemate of the d-isomer responsible for β1 adrenergic receptor antagonism and the l-isomer responsible for the release of nitric oxide from endothelial cells. Nebivolol is mainly metabolized to nebivolol glucuronide, which also contribute to the nebivolol β1 adrenoreceptor antagonism. This study reports the development and validation of an indirect stereoselective method of analysis of nebivolol glucuronides in plasma by LC-MS/MS. The method was applied to the investigation of stereoselectivity in the glucuronidation of nebivolol in elderly hypertensive patients (n=11) CYP2D6 phenotyped as EM and treated with a single oral dose of the racemate...
February 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28189891/stress-induced-changes-of-neurosteroid-profiles-in-rat-brain-and-plasma-under-immobilized-condition
#13
Myeong Hyeon Park, Shaheed Ur Rehman, In Sook Kim, Min Sun Choi, Hye Hyun Yoo
In this study, various neurosteroids in brain and plasma were simultaneously determined using liquid chromatography-tandem mass spectrometry and their profile changes in a stress-induced rats were investigated. The investigated neurosteroids are as follows: progesterone (P4), 5α-dihydroprogesterone (5α-DHP), 5β-dihydroprogesterone, estrone, androstenedione (AE), cortisol, cortisone, corticosterone (CORT), dehydroepiandrosterone (DHEA), pregnanolone (3α,5β-THP), allopregnanolone (ALLO), 11-deoxycorticosterone (DOC), 11-deoxycortisol, pregnenolone (PREG), and 5α/5β-tetrahydrodeoxycorticosterone (5α/5β-THDOC)...
February 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28189048/discovery-of-discriminatory-quality-control-markers-for-chinese-herbal-medicines-and-related-processed-products-by-combination-of-chromatographic-analysis-and-chemometrics-methods-radix-scutellariae-as-a-case-study
#14
Fei Wang, Bo Wang, Long Wang, Zi-Yue Xiong, Wen Gao, Ping Li, Hui-Jun Li
The processing procedure of traditional Chinese herbal medicines (CHMs) plays an essential role in clinical applications. However, little progress has been made on the quality control of crude and processed products. The present work, taking Radix Scutellariae (RS), wine-processed RS and carbonized RS as a typical case, developed a comprehensive strategy integrating chromatographic analysis and chemometric methods for quality evaluation and discrimination of crude RS and its processed products. Chemical fingerprints were established by high-performance liquid chromatography coupled with photodiode array detector and quadrupole time-of-flight mass spectrometry, and similarity analyses were calculated based on eleven common characteristic peaks...
February 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28189890/new-and-cost-effective-cell-based-assay-for-dialyzed-leukocyte-extract-dle-induced-jurkat-cells-proliferation-under-azathioprine-treatment
#15
F M Cardoso, M Tomkova, D Petrovajova, M Bubanova, O Ragac, T Hornakova
The human Dialyzed Leukocyte Extract (DLE) is a heterogeneous mix of oligopeptides of <10kDa, extracted from leukocytes of healthy donors. There is significant clinical evidence of improvement using DLE during treatment of allergies, cancer,immunodeficiencies, and in mycotic and viral infections. Nevertheless, the DLE exact nature and mechanism of action have been elusive for more than 50 years. DLE biological activity testing is necessary in DLE production and quality control. Both in vitro and in vivo assays exist: E-rosette test, induction of delayed type hypersensitivity in mice, leukocyte migration and IFN-γ secretion...
January 31, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28171789/optimized-multi-step-nmr-crystallography-approach-for-structural-characterization-of-a-stable-quercetin-solvate
#16
Xenia Filip, Maria Miclaus, Flavia Martin, Claudiu Filip, Ioana Georgeta Grosu
Herein we report the preparation and solid state structural investigation of the 1,4-dioxane-quercetin solvate. NMR crystallography methods were employed for crystal structure determination of the solvate from microcrystalline powder. The stability of the compound relative to other reported quercetin solvates is discussed and found to be in perfect agreement with the hydrogen bonding networks/supra-molecular architectures formed in each case. It is also clearly shown that NMR crystallography represents an ideal analytical tool in such cases when hydrogen-bonding networks are required to be constrained at a high accuracy level...
January 31, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28167419/comparative-pharmacokinetic-profiles-of-selected-irreversible-tyrosine-kinase-inhibitors-neratinib-and-pelitinib-with-apigenin-in-rat-plasma-by-uplc-ms-ms
#17
Hadir M Maher, Nourah Z Alzoman, Shereen M Shehata, Ashwag O Abahussain
Neratinib (NER) and pelitinib (PEL) are irreversible tyrosine kinase inhibitors (TKIs) that have been recently employed in cancer treatment. Apigenin (API), among other flavonoids, is known to have antioxidant, anti-proliferative, and carcinogenic effect. API can potentiate the antitumor effect of chemotherapeutic agents and/or alleviate the side effects of many anticancer agents. Since TKIs are mostly metabolized by CYP3A4 enzymes and that API could alter the enzymatic activity, potential drug interactions could be expected following their co-aministration...
January 31, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28183048/potential-impurities-of-anxiolytic-drug-clobazam-identification-synthesis-and-characterization-using-hplc-lc-esi-ms-n-and-nmr
#18
Neeraj Kumar, Subba Rao Devineni, Shailendra Kumar Dubey, Pramod Kumar
During the optimization of process, eight impurities (CLB Imp-A to CLB Imp-H) were detected in few of the laboratory batches of clobazam, used as anxiolytic agent, in the range of 0.02-0.12% using gradient HPLC method with UV detection. On the basis of co-spiking analysis, six impurities (CLB Imp-A to -F) enumerated by European Pharmacopoeia, however, not reported in the earlier literature, have been harmonized and found to be two impurities are completely unknown (CLB Imp-G and -H). These two new impurities structures were presumed based on LC-ESI/MS(n) study as 8-chloro-1-methyl-5-phenyl-1,5-dihydro-3H-1,5-benzodiazepine-2,4-dione (CLB Imp-G) and 5-chloro-1-methyl-3-phenyl-1H-benzo[d]imidazol-2(3H)-one (CLB Imp-H)...
January 29, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28167418/evaluation-of-in-silico-pharmacokinetic-properties-and-in-vitro-cytotoxic-activity-of-selected-newly-synthesized-n-succinimide-derivatives
#19
Natasa P Milosevic, Vesna Kojic, Jelena Curcic, Dimitar Jakimov, Natasa Milic, Nebojsa Banjac, Gordana Uscumlic, Roman Kaliszan
Design of a new drug entity is usually preceded by analysis of quantitative structure activity (properties) relationships, QSA(P)R. Six newly synthesized succinimide derivatives have been determined for (i) in silico physico-chemical descriptors, pharmacokinetic and toxicity predictors, (ii) in vitro biological activity on four different carcinoma cell lines and on normal fetal lung cells and (iii) lipophilicity on liquid chromatography. All compounds observed were predicted for good permeability and solubility, good oral absorption rate and moderate volume of distribution as well as for modest blood brain permeation, followed by acceptable observed toxicity...
January 29, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28167417/generic-dart-ms-platform-for-monitoring-the-on-demand-continuous-flow-production-of-pharmaceuticals-advancing-the-quantitative-protocol-for-caffeates-in-microfluidic-biocatalysis
#20
Yan Xu, Dong-Yang Zhang, Xiang-Yun Meng, Xi Liu, Sheng Sheng, Guo-Hua Wu, Jun Wang, Fu-An Wu
Today, continuous processing is regarded as an effective on-demand production technique of pharmaceuticals. Homemade microreactors packed with immobilized lipase under continuous-flow conditions were first applied to tailor the production of high-value caffeic acid phenethyl ester (CAPE) from methyl caffeate (MC) and 2-phenylethanol (PE) in cyclohexane via transesterification; however, this method is challenging due to the lack of a rapid platform for monitoring caffeates in microfluidic biocatalysis. The reactants were directly analyzed using Direct Analysis in Real Time Mass Spectrometry (DART-MS), and the corresponding ionization parameters were investigated...
January 29, 2017: Journal of Pharmaceutical and Biomedical Analysis
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