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https://www.readbyqxmd.com/read/29149711/enantiomeric-characterization-of-herbicide-lactofen-enantioseparation-absolute-configuration-assignment-and-enantioselective-activity-and-toxicity
#1
Jingqian Xie, Lu Zhao, Kai Liu, Fangjie Guo, Zunwei Chen, Weiping Liu
Chiral herbicides consist of two or more enantiomers, which usually differ in their biological properties and behave enantioselectively in biochemical process. Scant studies have been published in the past decades to characterize the enantiomers of herbicide lactofen. In this study, a laboratory method was developed to prepare the lactofen enantiomers using normal phase high performance liquid chromatography with an AD-H column, and μg level production yield was achieved in a single run. The two separated enantiomers had purity of ≫99%, with their absolute configurations assigned by experimental and calculated electronic and vibrational circular dichroism...
October 31, 2017: Chemosphere
https://www.readbyqxmd.com/read/29149042/comparative-study-of-biological-activities-of-venom-from-colubrid-snakes-rhabdophis-tigrinus-yamakagashi-and-rhabdophis-lateralis
#2
Yumiko Komori, Toru Hifumi, Akihiko Yamamoto, Atsushi Sakai, Manabu Ato, Kyoko Sawabe, Toshiaki Nikai
Rhabdophis lateralis, a colubrid snake distributed throughout the continent of Asia, has recently undergone taxonomic revisions. Previously, Rhabdophis lateralis was classified as a subspecies of R. tigrinus (Yamakagashi) until 2012, when several genetic differences were discovered which classified this snake as its own species. To elucidate the toxicity of venom from this poorly studied colubrid, various biological activities were compared between the venom from the two snake species. The components of their venom were compared by the elution profiles of reversed-phase HPLC and SDS-PAGE, and gel filtrated fractions were tested for effects on blood coagulation...
November 17, 2017: Toxins
https://www.readbyqxmd.com/read/29148595/determination-of-cefoperazone-and-sulbactam-in-serum-by-hplc-ms-ms-an-adapted-method-for-therapeutic-drug-monitoring-in-children
#3
Xiu-Jun Wu, Xin Huang, Hai-Yan Shi, Xing-Kai Chen, Qian Dong, Guo-Xiang Hao, Yan Li, Yi Zheng, Wei Zhao
A rapid, accurate and specific high-performance liquid chromatographic -tandem mass spectrometry method has been validated for the simultaneous determination of cefoperazone and sulbactam in a small volume sample for children. A Shim-pack XR-ODS C18 column with gradient elution of water (0.1% formic acid) and acetonitrile (0.1% formic acid) solution was used for separation at a flow rate of 0.3 mL/min. The calibration curves of two analytes in serum showed excellent linearity over the concentration ranges of 0...
November 17, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29148582/comparative-pharmacokinetics-study-of-orientin-in-rat-plasma-by-uhplc-ms-ms-after-intravenous-administration-of-single-orientin-and-trollius-chinensis-bunge-extract
#4
Nan Zhao, Qi Sun, Yang Song, Lin Wang, Tingjian Zhang, Fanhao Meng
Orientin showed a broad array of biological activities, and it is the major bioactive compound in the Trollius chinensis Bunge. Thus, this paper was conducted to investigate the comparative pharmacokinetics of orientin after intravenous administration of single orientin and Trollius chinensis Bunge extract. Sample preparation involved a simple one-step deproteinization procedure with acetonitrile. Chromatographic separation was achieved on a Waters BEH C18 column with a mobile phase consisting of acetonitrile and water containing 0...
November 17, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29148268/development-and-validation-of-a-uhplc-hrms-ms-quantification-method-for-hypoglycin-a-and-mcpa-carnitine-in-horse-serum-in-cases-of-atypical-myopathy
#5
Wiebke Rudolph, Daniela Remane, Dirk K Wissenbach, Carmen Klein, Dirk Barnewitz, Frank T Peters
Atypical myopathy (AM) is a fatal disease in horses presumably caused by hypoglycin A (HGA) from ingested maple seeds and its active metabolite methylenecyclopropyl-acetic-acid (MCPA). The aim of this study was the development and validation of a rapid and simple assay for HGA and MCPA-carnitine in horse serum and its application to authentic samples. Identification and quantification were carried out by high resolution LC-MS/MS with fullscan/data-dependent MS(2) . Chromatographic separation was performed by isocratic elution on a HILIC column (100 x 2...
November 17, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29148244/real-life-experience-with-bioresorbable-polymer-everolimus-eluting-stents-is-this-an-answer-in-search-of-a-question
#6
EDITORIAL
Youssef Rahban, Carey Kimmelstiel
Stent thrombosis and clinically driven restenosis are rare in the era of newer generation DES. The Synergy bioresorbable polymer DES appears to be comparable to other durable polymer and other bioabsorbable polymer DES in terms of safety and efficacy at 1-year post implantation. Further long-term study is needed to determine the specific role of the Synergy stent and other DES with bioabsorbable polymers.
November 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29147997/drug-eluting-balloon-angioplasty-for-assisted-maturation-of-failing-fistulae
#7
Alexandros Mallios, Jeffrey Hull, Benoit Boura, Alessandro Costanzo, Myriam Combes
OBJECTIVE: To present our experience of balloon-assisted maturation with drug-eluting balloon dilation in patients with recurrent failing arteriovenous fistulae. CASE SERIES: Three patients (all males, mean age 71 years) with a complex history of failed attempts at native fistula creation underwent surgical creation of arteriovenous fistulae. Two patients had a two-stage brachio-brachial fistula and 1 had a brachio-cephalic fistula that also required subsequent elevation...
November 13, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/29147747/isomers-of-tris-chloropropyl-phosphate-tcpp-in-technical-mixtures-and-environmental-samples
#8
Jimmy W Truong, Miriam L Diamond, Paul A Helm, Liisa M Jantunen
Tris(chloropropyl) phosphate (TCPP) is an environmentally abundant organophosphate ester (OPE). TCPP is comprised of four isomers with seven possible structures, eight CAS numbers, and even more common names. A review of 54 studies reporting one or more TCPP isomers confirmed that the most abundant and most often reported TCPP isomer was tris(2-chloro-1-methylethyl) phosphate, also known as tris(chloroisopropyl) phosphate (TCiPP, referred to hereafter as TCPP1). Full-scan gas chromatography-mass spectrometry (GC-MS) was used to identify the other three isomers numbered here according to their elution order on a non-polar GC column (DB-5): bis(2-chloro-1-methylethyl) (2-chloropropyl) phosphate (TCPP2), bis(2-chloropropyl)(2-chloro-1-methylethyl) phosphate (TCPP3), and tris(2-chloropropyl) phosphate (TCPP4)...
November 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29147746/multianalyte-high-throughput-liquid-chromatography-tandem-mass-spectrometry-method-for-the-sensitive-determination-of-fungicides-and-insecticides-in-wine
#9
Gabriela Castro, Leticia Pérez-Mayán, Tamara Rodríguez-Cabo, Isaac Rodríguez, Maria Ramil, Rafael Cela
Evidence of pesticide transfer from grapes to wine, added to differences in the national regulations regarding the number and the maximum concentration of these species in wine, demands analytical procedures suitable for their routine control in this foodstuff. In this research, solid-phase extraction (SPE) and ultra-performance liquid chromatography (UPLC), with tandem mass spectrometry (MS/MS) detection, are combined to obtain a sensitive and rapid procedure to determine 50 pesticides in red and white wines...
November 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29147473/bioresorbable-vascular-scaffold-versus-metallic-stent-in-percutaneous-coronary-intervention-results-of-the-aida-trial
#10
Syed Raza Shah, Mazia Fatima, Amin Muhammad Dharani, Waqas Shahnawaz, Syed Arbab Shah
Drug-eluting stents have significantly improved the long-term outcomes of percutaneous coronary intervention (PCI) by decreasing the excessive growth of neointima. However, conventional stents have some limitations. PCI with a bioresorbable vascular scaffold (BVS) has emerged as an alternative since the presence of the prosthesis in the coronary artery is transient. A US Food and Drug Administration advisory panel of experts recommended approval of BVS based on the analysis of its risks and rewards in July 2016...
2017: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/29146671/predictors-and-long-term-clinical-outcome-of-longitudinal-stent-deformation-insights-from-pooled-analysis-of-korean-multicenter-drug-eluting-stent-cohort
#11
Tae-Min Rhee, Kyung Woo Park, Joo Myung Lee, Michael S Lee, Ki-Hyun Jeon, Hyun-Jae Kang, Bon-Kwon Koo, Jay Young Rhew, Kwang Soo Cha, Jang-Ho Bae, Kyoo-Rok Han, Si-Hoon Park, Woo-Jung Park, Seung-Woon Rha, Seok-Kyu Oh, Hyuck Moon Kwon, Ki-Bae Seung, Taehoon Ahn, Sang-Hyun Kim, Hyo-Soo Kim
BACKGROUND: There are limited data on the frequency of and factors associated with quantitative coronary angiography (QCA)-defined longitudinal stent deformation (LSD) in various contemporary drug-eluting stents platforms. This study sought to evaluate the predictors of LSD and its long-term clinical implication. METHODS AND RESULTS: A patient-level pooled analysis was performed with 7350 lesions in 5871 patients treated with platinum-chromium-based everolimus-eluting stent (Promus Element), cobalt-chromium-based everolimus-eluting stent (Promus/Xience V), or cobalt-chromium-based zotarolimus-eluting stent (Endeavor Resolute)...
November 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29146427/applicability-of-retention-modelling-in-hydrophilic-interaction-liquid-chromatography-for-algorithmic-optimization-programs-with-gradient-scanning-techniques
#12
Bob W J Pirok, Stef R A Molenaar, Rianne E van Outersterp, Peter J Schoenmakers
Computer-aided method-development programs require accurate models to describe retention and to make predictions based on a limited number of scouting gradients. The performance of five different retention models for hydrophilic-interaction chromatography (HILIC) is assessed for a wide range of analytes. Gradient-elution equations are presented for each model, using Simpson's Rule to approximate the integral in case no exact solution exists. For most compound classes the adsorption model, i.e. a linear relation between the logarithm of the retention factor and the logarithm of the composition, is found to provide the most robust performance...
November 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29146426/determination-of-phthalic-acid-esters-in-water-samples-using-core-shell-poly-dopamine-magnetic-nanoparticles-and-gas-chromatography-tandem-mass-spectrometry
#13
Javier González-Sálamo, Bárbara Socas-Rodríguez, Javier Hernández-Borges, Miguel Ángel Rodríguez-Delgado
In this work, the first application of core-shell poly(dopamine) magnetic nanoparticles as sorbent for the extraction of a group of eleven phthalic acid esters of interest (i.e. diethyl phthalate (DEP), dipropyl phthalate (DPP), dibutyl phthalate (DBP), bis-isopentyl phthalate (DIPP), bis-n-pentyl phthalate (DNPP), benzylbutyl phthalate (BBP), dicyclohexyl phthalate (DCHP), di-(2-ethylhexyl) phthalate (DEHP), di-n-octyl phthalate (DNOP), diisononyl phthalate (DINP) and diisodecyl phthalate (DIDP)) and one adipate (bis (2-ethylhexyl) adipate, DEHA) from different water samples (Milli-Q, mineral, tap, pond and waste water) is proposed...
November 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29146240/channelled-tablets-an-innovative-approach-to-accelerating-drug-release-from-3d-printed-tablets
#14
Muzna Sadia, Basel Arafat, Waqar Ahmed, Robert E Forbes, Mohamed A Alhnan
Conventional immediate release dosage forms involve compressing the powder with a disintegrating agent that enables rapid disintegration and dissolution upon oral ingestion. Among 3D printing technologies, the fused deposition modelling (FDM) 3D printing technique has considerable potential for patient-specific dosage form. However, the use of FDM 3D printing in tablet manufacturing requires large portion of polymer, which slows down drug release through erosion and diffusion mechanisms. In this study, we demonstrate for the first time the use of a novel design approach of caplets with perforating channels to accelerate drug release from 3D printed tablets...
November 13, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29145097/lc-esi-ms-ms-determination-of-defactinib-a-novel-fak-inhibitor-in-mice-plasma-and-its-application-to-a-pharmacokinetic-study-in-mice
#15
Gurulingappa Hallur, Natarajan Tamizharasan, Suresh P Sulochana, Neeraj Kumar Saini, Mohd Zainuddin, Ramesh Mullangi
A sensitive, specific, selective and rapid LC-ESI-MS/MS method has been developed and validated for the quantification of defactinib in mice plasma using (13)C3,(15)N-tofacitinib as an internal standard (I.S.). Sample preparation was accomplished through a liquid-liquid extraction process. Baseline chromatographic resolution of defactinib and the I.S. was achieved on an Atlantis dC18 column using an isocratic mobile phase comprising 0.2% formic acid in water and acetonitrile (25:75, v/v) delivered at a flow rate of 0...
November 10, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29144402/characterization-of-non-derivatized-cellulose-samples-by-size-exclusion-chromatography-in-tetrabutylammonium-fluoride-dimethylsulfoxide-tbaf-dmso
#16
Jérémy Rebière, Antoine Rouilly, Vanessa Durrieu, Frédéric Violleau
This paper deals with the use of tetrabutylammonium fluoride/dimethylsulfoxide (TBAF/DMSO) to characterize the molar mass distribution of non-derivatized cellulosic samples by size exclusion chromatography (SEC). Different cellulose samples with various average degree of polymerization (DP) were first solubilized in this solvent system, with increasing TBAF rates, and then analyzed by SEC coupled to a refractive index detector (RID), using DMSO as mobile phase. The Molar Masses (MM) obtained by conventional calibration were then discussed and compared with suppliers' data and MM determined by viscosimetry measurements...
November 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29143972/determination-of-tubuloside-b-by-lc-ms-ms-and-its-application-to-a-pharmacokinetic-study-in-rats
#17
Shenbao Yang, Ruiying Qu, Peilu Sun, Shan Xiong, Siyi Yan, Zhipeng Deng
Tubuloside B, a novel neuroprotective phenylethanoid, is a major active constituent of Cistanche tubulosa and Cistanche deserticola. A specific and sensitive liquid chromatography tandem mass spectrometry (LC-MS/MS) method has been developed and validated for the quantification of tubuloside B in rat plasma. Sample preparation was conducted through a protein-precipitation extraction with methanol using tubuloside A as internal standard (IS). Chromatographic separation was achieved by using a Capcell Pak C18 column (2...
November 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29141596/effects-of-angiotensin-receptor-blockers-on-neointimal-characteristics-in-angina-patients-requiring-stent-implantation-optical-coherence-tomography-analysis
#18
Jae Young Cho, Soon Jun Hong, Do-Sun Lim
BACKGROUND: Angiotensin receptor blockers (ARBs) are known for its anti-inflammatory and anti-proliferative effects. The aim of the study was to evaluate long-term effects of ARBs on morphologic characteristics of stent restenosis in patients with coronary artery disease requiring stent implantation by optical coherence tomography (OCT). METHODS: Patients with coronary artery disease having history of drug-eluting stent implantation (n = 407) were analyzed on the basis of ARB therapy as the ARB group (n = 162) and the non-ARB group (n = 245)...
November 15, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/29139601/utility-of-the-acc-aha-lesion-classification-as-a-predictor-of-procedural-30-day-and-12-month-outcomes-in-the-contemporary-percutaneous-coronary-intervention-era
#19
James Theuerle, Matias B Yudi, Omar Farouque, Nick Andrianopoulos, Peter Scott, Andrew E Ajani, Angela Brennan, Stephen J Duffy, Christopher M Reid, David J Clark
BACKGROUND: Correlations between the ACC/AHA coronary lesion classification and clinical outcomes in the contemporary percutaneous coronary intervention (PCI) era are not well established. METHODS: We analyzed clinical characteristics and outcomes according to ACC/AHA lesion classification (A, B1, B2, C) in 13,701 consecutive patients from the Melbourne Interventional Group (MIG) registry. Patients presenting with STEMI, cardiogenic shock and out-of-hospital cardiac arrest were excluded...
November 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29139149/under-recognized-entity-of-the-transient-rise-in-the-atrial-capture-threshold-early-after-dual-chamber-pacemaker-implantation
#20
Yoshiko Uehara, Kentaro Yoshida, Akira Kimata, Kojiro Ogawa, Daisuke Abe, Yasuaki Tsumagari, Hidekazu Tsuneoka, Yoshiaki Yui, Yoko Ito, Mari Ebine, Noriyuki Takeyasu, Kazutaka Aonuma, Akihiko Nogami
BACKGROUND: Steroid-eluting pacemaker leads suppress acute rises in pacing threshold by preventing inflammatory processes. However, we occasionally encounter not persistent but transient rise in the atrial capture threshold (TRACT) early after pacemaker implantation. We believe that this phenomenon is under-recognized in clinical practice and may potentially lead to unnecessary re-intervention. We aimed to clarify the prevalence, predictors, and possible mechanisms of TRACT. METHODS AND RESULTS: We reviewed clinical records from 239 consecutive patients who underwent dual-chamber pacemaker implantation for sick sinus syndrome (SSS) (N = 102) or atrioventricular block (AVB) (N = 137)...
November 15, 2017: Pacing and Clinical Electrophysiology: PACE
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