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Journal of Pharmaceutical and Biomedical Analysis

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https://www.readbyqxmd.com/read/29331797/application-of-polyacrylamide-gel-as-a-new-membrane-in-electromembrane-extraction-for-the-quantification-of-basic-drugs-in-breast-milk-and-wastewater-samples
#1
Sakine Asadi, Hadi Tabani, Saeed Nojavan
Introducing new membranes with green chemistry approach seems to be a great challenge for the development of a practical method in separation science. In this regard, for the first time, polyacrylamide gel as a new membrane in electromembrane extraction (EME) was used for the extraction of three model basic drugs (pseudoephedrine (PSE), lidocaine (LID), and propranolol (PRO)), followed by HPLC-UV. In comparison with conventional EME, in this method neither organic solvent nor carrier agents were used for extraction of mentioned drugs...
January 9, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29331795/development-and-validation-of-an-uhplc-ms-ms-approach-for-simultaneous-quantification-of-five-bioactive-saponins-in-rat-plasma-application-to-a-comparative-pharmacokinetic-study-of-aqueous-extracts-of-raw-and-salt-processed-achyranthes-bidentata
#2
Yi Tao, Yingshan Du, Weidong Li, Baochang Cai
A simple, accurate and sensitive ultra high-performance liquid chromatography-tandem mass spectrometry approach was established for the simultaneous determination of β-ecdysterone, 25S-inokosterone, ginsenoside Ro, chikusetsusaponin IV and chikusetsusaponin IVa in rat plasma after oral administration of raw and salt-processed Achyranthes bidentata extract. The saponins were completely separated on a Waters BEH C18 UHPLC column by using acetonitrile/0.1% formic acid-water as mobile phases. The mass analysis was performed in a triple quadrupole mass spectrometer using multiple reaction monitoring (MRM) with negative scan mode...
January 9, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29331796/determination-of-meropenem-in-endotracheal-tubes-by-in-tube-solid-phase-microextraction-coupled-to-capillary-liquid-chromatography-with-diode-array-detection
#3
L Hakobyan, J Pla Tolos, Y Moliner-Martinez, C Molins-Legua, Jesús Ruiz Ramos, M Gordon, Paula Ramirez-Galleymore, P Campins-Falco
Meropenem is a widely used antimicrobial for the treatment of infections associated with the use of invasive medical devices in intensive care unit patients. These treatments are not always effective, in fact, in-vitro studies have demonstrated the difficulty of antimicrobials to penetrate into the biofilm, however in-vivo studies of the effect of these compounds is a trend, mostly because of the complexity of pulmonary samples extracted from ETTs. Therefore, the objective of this study was to evaluate in-tube solid phase microextraction (in-tube SPME) coupled to capillary liquid chromatography (CapLC) with DAD to determine meropenem in ETTs in order to estimate the penetration capability into the biofilm...
January 8, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29324282/influence-of-glycan-modification-on-igg1-biochemical-and-biophysical-properties
#4
Jake W Pawlowski, Adriana Bajardi-Taccioli, Damian Houde, Marina Feschenko, Tyler Carlage, Igor A Kaltashov
Monoclonal antibodies (mAbs) are the fastest growing class of biopharmaceuticals. The specific therapeutic tasks vary among different mAbs, which may include neutralization of soluble targets, activation of cytotoxic pathways, targeted drug delivery, and diagnostic imaging. The specific therapeutic goal defines which interactions of the antibody with its multiple physiological partners are most critical for function, and which ones are irrelevant or indeed detrimental. In this work, we explored the ability of the glycan chains to affect IgG1 interaction with two key receptor families, FcRn and γ-type Fc receptors, as well as the influence of glycan composition on the conformation and stability of the antibody molecule...
January 3, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29310049/-positive-urine-testing-for-cannabis-is-associated-with-increased-risk-of-traffic-crashes
#5
Giovanna Del Balzo, Rossella Gottardo, Silvia Mengozzi, Romolo M Dorizzi, Federica Bortolotti, Svetlana Appolonova, Franco Tagliaro
Although recent Cannabis use is widely reported to be associated with drug-related traffic accidents, the evidence that Cannabis users show an increased risk of being involved in road crashes is still not unequivocally proved. The purpose of the present work is to provide an objective assessment of this hypothesis, by comparing the frequency of occurrence of positive urine analyses in drivers involved in traffic accidents (n = 1406) with that observed in a control population undergoing mandatory urine drug testing (n = 1953)...
January 3, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29306735/identification-of-metabolites-of-mdr-1339-an-inhibitor-of-%C3%AE-amyloid-protein-aggregation-and-kinetic-characterization-of-the-major-metabolites-in-rats
#6
Jun-Hyeng Son, Yoo-Seong Jeong, Jong-Hwa Lee, Min-Soo Kim, Kyeong-Ryoon Lee, Chang-Koo Shim, Young Ho Kim, Suk-Jae Chung
We previously reported that MDR-1339, an inhibitor of β-amyloid protein aggregation, was likely to be eliminated by biotransformation in rats. The objective of this study was to determine the chemical identity of metabolites derived from this aggregate inhibitor and to characterize the kinetics of formation of these metabolites in rats. Using high performance liquid chromatography coupled with mass spectrometry with a hybrid triple quadrupole-linear ion trap, 7 metabolites and 1 potential metabolic intermediate were identified in RLM incubations containing MDR-1339...
January 3, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29324279/inhibition-of-udp-glucose-dehydrogenase-by-6-thiopurine-and-its-oxidative-metabolites-possible-mechanism-for-its-interaction-within-the-bilirubin-excretion-pathway-and-6tp-associated-liver-toxicity
#7
Chamitha J Weeramange, Cassie M Binns, Chixiang Chen, Ryan J Rafferty
6-Thiopurine (6TP) is an actively prescribed drug in the treatment of various diseases ranging from Crohn's disease and other inflammatory diseases to acute lymphocytic leukemia and non-Hodgkin's leukemia. While 6TP has beneficial therapeutic uses, severe toxicities are also reported with its use, such as jaundice and liver toxicity. While numerous investigations into the mode in which toxicity originates has been undertaken. None have investigated the effects of inhibition towards UDP-Glucose Dehydrogenase (UDPGDH), an oxidative enzyme responsible for UDP-glucuronic acid (UDPGA) formation or UDP-Glucuronosyl transferase (UGT1A1), which is responsible for the conjugation of bilirubin with UDPGA for excretion...
December 30, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29310052/simultaneous-determination-of-tpn729-and-its-five-metabolites-in-human-plasma-and-urine-by-liquid-chromatography-coupled-to-tandem-mass-spectrometry
#8
Yang Liu, Shuguang Shao, Hanlin Song, Xueting Yao, Jie Liu, Hongzhong Liu, Ling Song, Ji Jiang, Dongyang Liu, Pei Hu
A specific and sensitive method was firstly developed using high performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) to simultaneously quantify TPN729 and its metabolites (TPN729-D1, TPN729-D2, TPN729M15-3 and TPN729M3) in human plasma and (TPN729-D1, TPN729-D2, TPN729M15-3 and TPN729M14) in human urine. Protein precipitation and direct dilution were used to extract TPN729 and its metabolites from plasma and urine, respectively. Ionization of TPN729, TPN729-D1, TPN729-D2, TPN729M15-3, TPN729M3, TPN729M14 and sildenafil (internal standard, IS) was performed using an electrospray ionization (ESI) source in positive mode and detection was carried out with multiple reaction monitoring (MRM) mode...
December 30, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29306734/establishment-of-a-reference-standard-database-for-use-in-the-qualitative-and-semi-quantitative-analysis-of-pharmaceutical-contact-materials-within-an-extractables-survey-by-gc-ms
#9
Steven A Zdravkovic, Cindy T Duong, Ashley A Hellenbrand, Steven R Duff, Alyssa L Dreger
The analysis of reference standards may be performed to enhance the qualitative and quantitative data generated by non-specific screening methods utilized in extractables studies performed on pharmaceutical contact materials. However, the establishment of a database containing relative response factor and retention index values obtained from these standards has not been published. In this study, the establishment of such a database for GC-MS, a methodology commonly included in extractables studies, on an intra-lab basis was investigated...
December 29, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29328982/systematic-identification-of-suspected-anthelmintic-benzimidazole-metabolites-using-lc-ms-ms
#10
Marius Majewsky, David Castel, Ludivine Le Dret, Pascal Johann, David T Jones, Stefan M Pfister, Walter E Haefeli, Jürgen Burhenne
Metabolite reference standards are often not available, which results in a lack of MS/MS spectra for library matching. Consequently, the identification of suspected metabolites proves to be challenging. The present study aims at structurally elucidating the MS/MS fragmentation behavior of selected benzimidazole anthelmintics to theoretically predict characteristic product ions for rapid and systematic tentative metabolite identification. A set of common characteristic product ions was identified from accurate mass MS/MS experiments for five parent compounds...
December 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29328981/a-simple-lc-ms-ms-method-for-determination-of-deferasirox-in-human-plasma-troubleshooting-of-interference-from-ferric-ion-in-method-development-and-its-application
#11
Tengfei Li, Zhimin Cui, Yan Wang, Wen Yang, Duo Li, QinXin Song, Luning Sun, Li Ding
As an orally active iron chelator, deferasirox forms its ion complexes in the prepared plasma samples and LC-MS mobile phase where ferric ion exists, and then comparing with the nominal concentration level, a lower detected concentration level of deferasirox would be obtained after LC-MS analysis, if no proper treatment was adopted. Meanwhile, the phenomenon would be observed that multiple repeat injections of the same deferasirox plasma sample in the same tube would show the lower and lower detected concentration levels of deferasirox, which caused by more and more ferric ions from the injection needle dissolved in the sample solution as multiple repeated injections...
December 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29324280/effective-phospholipids-removing-microelution-solid-phase-extraction-lc-ms-ms-method-for-simultaneous-plasma-quantification-of-aripiprazole-and-dehydro-aripiprazole-application-to-human-pharmacokinetic-studies
#12
Aneta Wojnicz, Carmen Belmonte, Dora Koller, Ana Ruiz-Nuño, Manuel Román, Dolores Ochoa, Francisco Abad Santos
A simple liquid chromatography-tandem mass spectrometry (LC-MS/MS) method has been developed and validated for simultaneous quantification of aripiprazole and its active metabolite, dehydro-aripiprazole, in human plasma. Stable isotopically labeled aripiprazole, aripiprazole-D8, has been used as the internal standard (IS) for both analytes. Only 200 μl of human plasma was needed for analyte extraction, using effective phospholipids-eliminating three-step microelution-solid-phase extraction (SPE, Oasis PRiME HLB 96-well μElution Plate)...
December 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29310050/explore-the-effects-of-huang-lian-jie-du-tang-on-alzheimer-s-disease-by-uplc-qtof-ms-based-plasma-metabolomics-study
#13
Li-Min Sun, Bao-Jie Zhu, Hui-Ting Cao, Xin-Yi Zhang, Qi-Chun Zhang, Gui-Zhong Xin, Lin-Mei Pan, Li-Fang Liu, Hua-Xu Zhu
Alzheimer's disease (AD) is a progressive neurodegenerative disease with neither definitive pathogenesis nor effective treatment method so far. Huang-Lian-Jie-Du-Tang (HLJDT) is a classic formula of traditional Chinese medicine (TCM) proven to have ameliorative effects on learning and memory deficits of dementia. Morris water maze (MWM) test and pathology analysis have demonstrated that HLJDT could ameliorate learning and memory deficits in AD mouse model, which may act via its anti-neuroinflammation properties...
December 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29304411/rapid-screening-of-brain-penetrable-antioxidants-from-natural-products-by-blood-brain-barrier-specific-permeability-assay-combined-with-dpph-recognition
#14
Junfeng Zhu, Xiaojiao Yi, Jinghui Zhang, Shuqing Chen, Yongjiang Wu
Screening brain-penetrable antioxidants from natural products is a promising way for neuroprotective drug discovery. However, there is no screening methodology enables simultaneous investigation of antioxidant activity and blood-brain barrier (BBB) permeability of compounds from complex samples. Here we propose a novel strategy by combining BBB specific parallel artificial membrane permeability assay with 1,1-diphenyl-2-picrylhydrazyl recognition (BBB-PAMPA-DPPH) to achieve rapid multicomponent screening. First, BBB specific artificial membrane was constructed to separate the compounds with high BBB permeability in herbal extracts...
December 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29324281/chemical-profiling-of-euphorbia-fischeriana-steud-by-uhplc-q-tof-ms
#15
Canjian Wang, Xiaoqi Zhang, Xiaohong Yan, Wencai Ye, Shuangcheng Ma, Yingqiao Jiang
Ultra-high-performance liquid chromatography coupled with quadrupole/time-of-flight mass spectrometry (UHPLC-Q/TOF-MS) in positive ion mode was used to profile and identify the major constituents in Euphorbia fischeriana Steud. (E. fischeriana). An Agilent ZORBAX SB-C18 column was used to separate the crude extract of E. fischeriana, and the mobile phases were acetonitrile and 0.1% aqueous formic acid (v/v). A total of 40 peaks were detected, and 37 components, including phloroglucinol derivatives, diterpenoids and nitrogenous compounds, were identified based on their accurate masses and fragmentation characteristics...
December 26, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29294409/ultra-sensitive-lc-ms-ms-method-for-the-quantification-of-gemcitabine-and-its-metabolite-2-2-difluorodeoxyuridine-in-human-plasma-for-a-microdose-clinical-trial
#16
M van Nuland, M J X Hillebrand, H Rosing, J A Burgers, J H M Schellens, J H Beijnen
In microdose clinical trials a maximum of 100 μg of drug substance is administered to participants, in order to determine the pharmacokinetic properties of the agents. Measuring low plasma concentrations after administration of a microdose is challenging and requires the use of ulta-sensitive equipment. Novel liquid chromatography-mass spectrometry (LC-MS/MS) platforms can be used for quantification of low drug plasma levels. Here we describe the development and validation of an LC-MS/MS method for quantification of gemcitabine and its metabolite 2',2'-difluorodeoxyuridine (dFdU) in the low picogram per milliliter range to support a microdose trial...
December 26, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29304410/simultaneous-quantitative-determination-of-bioactive-terpene-indole-alkaloids-in-ethanolic-extracts-of-catharanthus-roseus-l-g-don-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#17
Sunil Kumar, Awantika Singh, Brijesh Kumar, Bikarma Singh, Lal Bahadur, Mohan Lal
A rapid, sensitive and reproducible method using ultra-high-performance liquid chromatography coupled with electrospray ionization hybrid triple quadrupole-linear ion trap mass spectrometry (UHPLC-ESI-QqQLIT-MS/MS) in multiple reaction monitoring (MRM) mode was developed and validated for simultaneous quantitation of anticancer (vincristine, vinblastine, vindesine), antihypertensive (ajmaline, ajmalicine, reserpine), aphrodisiac (yohimbine), sedative (serpentine) agents, dietary supplement (vinpocetine, yohimbine) and precursor of vinblastine (vindoline) from crude extracts of Catharanthus roseus...
December 25, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29310051/lc-ms-ms-method-for-simultaneous-determination-of-diethylcarbamazine-albendazole-and-albendazole-metabolites-in-human-plasma-application-to-a-clinical-pharmacokinetic-study
#18
Yashpal S Chhonker, Constant Edi, Daryl J Murry
Combination therapy with anti-filarial drugs is now widely used for treatment of lymphatic filariasis. A rapid, selective, and sensitive liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) method was developed and validated for simultaneous quantitation of diethylcarbamazine (DEC), albendazole (ABZ) and albendazole metabolites in human plasma. Separation and detection of analytes were achieved on a reversed phase column (Acquity UPLC®BEH C18 column (100 × 2.1 mm, 1.7 μm) with gradient elution using 0...
December 24, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29291588/accurate-analysis-of-parabens-in-human-urine-using-isotope-dilution-ultrahigh-performance-liquid-chromatography-high-resolution-mass-spectrometry
#19
Hui-Ting Zhou, Hsin-Chang Chen, Wang-Hsien Ding
An analytical method that utilizes isotope-dilution ultrahigh-performance liquid chromatography coupled with hybrid quadrupole time-of-flight mass spectrometry (UHPLC-QTOF-MS or called UHPLC-HRMS) was developed, and validated to be highly precise and accurate for the detection of nine parabens (methyl-, ethyl-, propyl-, isopropyl-, butyl-, isobutyl-, pentyl-, hexyl-, and benzyl-parabens) in human urine samples. After sample preparation by ultrasound-assisted emulsification microextraction (USAEME), the extract was directly injected into UHPLC-HRMS...
December 24, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29291586/new-insights-into-the-efficiency-of-thymol-synergistic-effect-with-p-cymene-in-inhibiting-advanced-glycation-end-products-a-multi-way-analysis-based-on-spectroscopic-and-electrochemical-methods-in-combination-with-molecular-docking-study
#20
Saleheh Abbasi, Sajjad Gharaghani, Ali Benvidi, Masoud Rezaeinasab
Protein glycation in the body is one of the main reasons of diabetes complications. The electrochemical studies on the inhibitory mechanism of glycation are rather scarce. Thus, it is important to investigate the role of electrochemistry in the glycation process with basic chemometric frameworks. The aim of the current study is to investigate the anti-glycation effects of candidate compounds from thyme species i.e. thymol and p-cymene. To gain this objective, the electrochemical and absorption responses of glycated bovine serum albumin (BSA) in the absence and presence of inhibitors were recorded after 20 day of incubation...
December 24, 2017: Journal of Pharmaceutical and Biomedical Analysis
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