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Chen L, Su M, Wu XZ, Wang DZ, Kang YY, Wang CG, Assani I, Wang MX, Zhao SF, Lv SM, Wang JW, Sun B, Li Y, Jin Q, Huang RZ, Liao ZX. Discovery of 2H-chromone-4-one based sulfonamide derivatives as potent retinoic acid receptor-related orphan receptor γt inverse agonists. Eur J Med Chem 2022; 229:114065. [PMID: 34971876 DOI: 10.1016/j.ejmech.2021.114065] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/22/2021] [Accepted: 12/19/2021] [Indexed: 02/08/2023]
Abstract
Retinoic acid receptor related orphan receptor γt (RORγt), identified as the essential functional regulator of IL-17 producing Th17 cells, is an attractive drug target for treating autoimmune diseases. Starting from the reported GSK2981278 (Phase II), we structurally modified and synthesized a series of 2H-chromone-4-one based sulfonamide derivatives as novel RORγt inverse agonists, which significantly improved their human metabolic stabilities while maintaining a potent RORγt inverse agonist profile. Efforts in reducing the lipophilicity and improving the LLE values led to the discovery of c9, which demonstrated potent RORγt inverse agonistic activity and consistent metabolic stability. During in vivo studies, oral administration of compound c9 exhibited a robust and dose-dependent inhibition of IL-17A cytokine expression and significantly lessened the skin inflammatory symptoms in the mouse imiquimod-induced skin inflammation model. Docking analysis of the binding mode revealed that c9 can suitably occupy the active pocket, and the introduction of the morpholine pyridine group can interact with Leu396, His479, and Cys393. Thus, compound c9 was selected as a preclinical compound for treating Th17-driven autoimmune diseases.
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Affiliation(s)
- Lei Chen
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Mei Su
- Jiangsu Carefree Pharmaceutical Co., Ltd, Nanjing, 210042, China
| | - Xian-Zhi Wu
- Jiangsu Carefree Pharmaceutical Co., Ltd, Nanjing, 210042, China
| | - De-Zhong Wang
- Jiangsu Carefree Pharmaceutical Co., Ltd, Nanjing, 210042, China
| | - Yang-Yang Kang
- Jiangsu Carefree Pharmaceutical Co., Ltd, Nanjing, 210042, China
| | - Chun-Gu Wang
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Israa Assani
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Mu-Xuan Wang
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Shi-Feng Zhao
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Shen-Min Lv
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Jia-Wei Wang
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Bo Sun
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Yan Li
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China
| | - Qiu Jin
- Jiangsu Carefree Pharmaceutical Co., Ltd, Nanjing, 210042, China.
| | - Ri-Zhen Huang
- College of Biotechnology, Guilin Medical University, Guilin, 541004, China.
| | - Zhi-Xin Liao
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China.
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Martin, Zhou Y, Meng CX, Takagi T, Tian YS. Vonoprazan vs proton pump inhibitors in treating post-endoscopic submucosal dissection ulcers and preventing bleeding: A meta-analysis of randomized controlled trials and observational studies. Medicine (Baltimore) 2020; 99:e19357. [PMID: 32118778 PMCID: PMC7478518 DOI: 10.1097/md.0000000000019357] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 12/17/2019] [Accepted: 01/29/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Vonoprazan is a potassium-competitive acid blocker (P-CAB) that is frequently used in Japan for Helicobacter pylori (H. pylori) eradication, treatment of gastroesophageal reflux disease, and treatment of post endoscopic submucosal dissection (ESD) complications. We sought to determine if vonoprazan was superior to proton pump inhibitors (PPIs) for treating ESD-induced ulcers (as assessed by ulcer healing and shrinkage ratios) and preventing delayed bleeding over various treatment durations (2, 4, and 8 weeks). METHODS We collected randomized controlled trials (RCTs) and observational studies that discussed the effectiveness of vonoprazan and PPIs on ESD-induced ulcers and bleeding from PubMed, Cochrane Library, ClinicalTrials.gov, and Google Scholar. Studies were selected according to pre-established eligibility criteria and data were extracted separately by 2 researchers with double-check. We used the Cochrane risk of bias tool to assess RCTs and the Newcastle-Ottawa Quality Assessment Scale to assess observational studies. Meta-analyses, based on the random-effects model, were conducted to compare differences in ulcer shrinkage ratios (%) and odds ratios (ORs) for ulcer healing and delayed bleeding. Publication bias was evaluated using funnel plots and Egger regression test. Heterogeneity was assessed using I statistics. A sensitivity analysis was conducted to check the robustness of results. The evidential quality of the findings was assessed using the GRADE profiler. RESULTS Thirteen studies were included in this meta-analysis. The OR effect sizes of vonoprazan relative to PPIs for ulcer healing were 1.33 (P = .13) with a 95% CI (0.33-3.21) at 4 weeks and 1.48 (P = .09) with a 95% CI (0.81-5.20) at 8 weeks. The overall effect size for the shrinkage ratio was 12.24% (P = .16) with a 95% CI (-4.96-29.44) at 2 weeks. The effect size of its subgroup of H. pylori-positive patients was 19.51% (P < .001) with a 95% CI (11.91-27.12). The overall OR for the occurrence of delayed bleeding was 0.66 (P = .26) with a 95% CI (0.32-1.35). After excluding combination drug studies, the overall ORs between vonoprazan and PPIs on ulcer healing and delayed bleeding were 1.44 and 0.76, respectively. CONCLUSION During the first 2 weeks of treatment, vonoprazan was more effective than PPIs for treating H. pylori-positive patients with ESD-induced gastric ulcers.
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Phu TM, Phuong NT, Scippo ML, Dalsgaard A. Quality of Antimicrobial Products Used in Striped Catfish (Pangasianodon hypophthalmus) Aquaculture in Vietnam. PLoS One 2015; 10:e0124267. [PMID: 25897517 PMCID: PMC4405571 DOI: 10.1371/journal.pone.0124267] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 03/12/2015] [Indexed: 11/19/2022] Open
Abstract
Antimicrobial usage is common in Asian aquaculture. This study aimed to determine the quality of antimicrobial products used by Vietnamese striped catfish (Pangasianodon hypophthalmus) farmers. Twenty one antimicrobial products (11 products contained a single antimicrobial and 10 products contained a mixture of two different antimicrobials) commonly used by catfish farmers were obtained from so-called chemical shops located in the Mekong Delta, Vietnam. Ultra High Performance Liquid Chromatography Mass Spectrometry was used to analyze concentration of sulfonamides, trimethoprim, amoxicillin, cefalexin and ciprofloxacin whereas concentrations of florfenicol and doxycycline were analyzed by High Performance Liquid Chromatography with UV detection. Results revealed that only 4/11 products with a single antimicrobial and 2/10 products with a mixture of antimicrobials contained active substances within ±10% of the concentration declared on the product label. Two products with antimicrobial mixtures did not contain any of the declared antimicrobials. Comparing two batches, analysis of 11 products revealed that only one product contained a concentration of active compound that varied with less than 10% in both batches. Several product labels provided inadequate information on how to calculate therapeutic dosage and further stated withdrawal time despite lack of pharmacokinetic data on the antimicrobials in catfish. There is an urgent need to strengthen approval procedures and in particular regularly to monitor the quality of antimicrobials used in Vietnamese aquaculture.
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Affiliation(s)
- Tran Minh Phu
- Department of Aquatic Nutrition and Products Processing, College of Aquaculture and Fisheries, Can Tho University, Can Tho, Vietnam
- Department of Veterinary Disease Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- * E-mail:
| | - Nguyen Thanh Phuong
- Department of Aquatic Nutrition and Products Processing, College of Aquaculture and Fisheries, Can Tho University, Can Tho, Vietnam
| | - Marie-Louise Scippo
- Department of Food Sciences, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Anders Dalsgaard
- Department of Veterinary Disease Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Stolarczyk EU, Groman A, Łuniewski W. Development and validation of the GC method for the quantitative determination of semi-volatile solvents in the pharmaceutical substance bosentan. Acta Pol Pharm 2014; 71:1107-1113. [PMID: 25745788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Prezista gets EU approval. AIDS Patient Care STDS 2007; 21:223. [PMID: 17428190 DOI: 10.1089/apc.2007.9995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Tsukamoto Y, Santa T, Yoshida H, Miyano H, Fukushima T, Hirayama K, Imai K, Funatsu T. A further study on the combined use of internal standard and isotope-labeled derivatization reagent for expansion of linear dynamic ranges in liquid chromatography–electrospray mass spectrometry. Biomed Chromatogr 2006; 20:1049-55. [PMID: 16506283 DOI: 10.1002/bmc.636] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The combined use of a so-called internal standard and the isotope-labeled derivatization reagent for the quantification of analytes for liquid chromatography-mass spectrometry (LC/MS) was further studied. The sample solution (containing the analytes and an internal standard) was derivatized with the light form of the derivatization reagent, 7-(N,N-dimethylaminosulfonyl)-4-(aminoethyl)piperazino-2,1,3-benzoxadiazole (DBD-PZ-NH(2)) or 7-(N,N-dimethylaminosulfonyl)-4-piperazino-2,1,3-benzoxadiazole (DBD-PZ). A standard solution of the analytes (containing an internal standard) was derivatized with the isotope (d(6))-labeled derivatization reagent, DBD-PZ-NH(2) (D) or DBD-PZ (D), and served as the isotope-labeled internal standards. The peak heights of the targeted analytes derivatives in the sample solution were corrected using those of the internal standard and the heavy form derivatives of the standards, and the calibration curves were constructed. The curve bending of the calibration curves caused by the ion suppression at the ion source was suppressed and the linear dynamic ranges of the calibration curves were expanded. The derivatives of DBD-PZ-NH(2) were about 10 times more sensitively detected than those of DBD-PZ derivatives and, therefore, DBD-PZ-NH(2) might be suitable for sensitive detection.
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Affiliation(s)
- Yuhki Tsukamoto
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Zhang M, Moore GA, Gardiner SJ, Begg EJ. Determination of celecoxib in human plasma and breast milk by high-performance liquid chromatographic assay. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 830:245-8. [PMID: 16297669 DOI: 10.1016/j.jchromb.2005.10.048] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2005] [Revised: 10/27/2005] [Accepted: 10/30/2005] [Indexed: 11/27/2022]
Abstract
A rapid and simple HPLC assay was developed for the determination of celecoxib in human plasma and breast milk. After proteins were precipitated with acetonitrile, celecoxib was resolved on a C18 column and detected by UV detection at 254 nm. Standard curves were linear over the concentration range 10-2000 microg/L (r(2)>0.99). Bias was </=+/-15% from 20 to 2000 microg/L in both matrices, intra- and inter-day coefficients of variation (imprecision) were <10%, and the limit of quantification was 10 microg/L.
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Affiliation(s)
- Mei Zhang
- Clinical Pharmacology, Department of Medicine, Christchurch School of Medicine and Health Sciences, University of Otago, Christchurch, New Zealand.
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Hirsch M, O'donnell J, Olsson A. Rosuvastatin is cost-effective compared with atorvastatin in reaching cholesterol goals. Int J Cardiol 2005; 104:251-6. [PMID: 16186052 DOI: 10.1016/j.ijcard.2004.09.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2004] [Accepted: 09/22/2004] [Indexed: 10/25/2022]
Abstract
BACKGROUND Lowering low-density lipoprotein cholesterol (LDL-C) levels reduces the risk of coronary heart disease. The introduction of a highly efficacious new statin, rosuvastatin, may enable more patients to be treated to LDL-C goal within a fixed budget. OBJECTIVES To compare the cost-effectiveness of rosuvastatin 10 mg and atorvastatin 10 mg in lowering LDL-C and achieving guideline goals after 12 weeks of treatment. The LDL-C goals were those recommended by the National Cholesterol Education Program Adult Treatment Panel (NCEP ATP) III and the Third Joint European Task Force. METHODS The analysis was performed on pooled data from three clinical trials. Efficacy was measured as the percent reduction in LDL-C and the proportion of patients who reached guideline LDL-C goals following the first 12 weeks of treatment, prior to dose titration. Costs comprised drug acquisition costs only. The cost-effectiveness measures were cost per 1% reduction in LDL-C and cost per patient treated to their LDL-C goal. RESULTS Treatment with rosuvastatin 10 mg costs 1.85 per 1% reduction in LDL-C, compared with 2.37 per 1% reduction with atorvastatin 10 mg. The average costs per patient treated to the European LDL-C goals were 130.18 for rosuvastatin 10 mg and 242.44 for atorvastatin 10 mg. Treating to NCEP ATP III goals costs 115 per patient treated with rosuvastatin 10 mg vs. 163 per patient treated with atorvastatin 10 mg. CONCLUSIONS Rosuvastatin has the same acquisition costs as and is more efficacious than atorvastatin in lowering LDL-C and treating patients to target LDL-C levels.
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Strutt K, Caplan R, Hutchison H, Dane A, Blasetto J. More Western hypercholesterolemic patients achieve Japan Atherosclerosis Society LDL-C goals with rosuvastatin therapy than with atorvastatin, pravastatin, or simvastatin therapy. Circ J 2004; 68:107-13. [PMID: 14745143 DOI: 10.1253/circj.68.107] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Data from Western comparative trials suggest that rosuvastatin is more effective than atorvastatin, simvastatin, and pravastatin in helping hypercholesterolemic patients achieve US and European lipid-lowering guidelines. The purpose of this analysis was to assess the comparative efficacy of rosuvastatin in reducing low-density lipoprotein cholesterol (LDL-C) to levels recommended by the Japan Atherosclerosis Society (JAS). METHODS AND RESULTS A post hoc analysis of data from 6 randomized, double-blind, active-controlled trials was conducted to evaluate the relative efficacy of rosuvastatin and comparator statins in helping patients achieve the LDL-C goals established by the JAS. The first 5 trials, prospectively designed for pooling, were originally conducted to compare the effects of rosuvastatin with either atorvastatin, simvastatin, or pravastatin in reducing lipid levels and helping patients achieve the LDL-C goals established by the National Cholesterol Education Program. The 6th trial was conducted with similar objectives, but in patients with heterozygous familial hypercholesterolemia (HeFH). Data from 2,139 hypercholesterolemic patients in the first 5 trials were pooled for analysis: rosuvastatin 5 mg (n=390) or 10 mg (n=389) vs atorvastatin 10 mg (n=393); rosuvastatin 5 mg (n=240) or 10 mg (n=226) vs simvastatin 20 mg (n=249) or pravastatin 20 mg (n=252). In the studies with atorvastatin as the comparator, JAS-defined LDL-C goals were reached by 67.2% of the rosuvastatin 5-mg group, 82.3% of the rosuvastatin 10-mg group, and 58.0% of the atorvastatin 10-mg group (p<0.001 for both rosuvastatin groups vs atorvastatin) at 12 weeks. Similarly, in the trials with pravastatin and simvastatin as comparators, the JAS LDL-C goals were reached by 77.5% of the rosuvastatin 5-mg group, 86.7% of the rosuvastatin 10-mg group, 45.2% of the pravastatin 20-mg group and 65.5% of the simvastatin 20-mg group (p<0.001 for both rosuvastatin groups vs pravastatin and simvastatin). In the trial of HeFH patients (n=433 for rosuvastatin, n=187 for atorvastatin), 31.9% of patients treated with rosuvastatin 20 mg achieved JAS LDL-C goals, compared with 17.6% of patients treated with atorvastatin 20 mg (p<0.001). CONCLUSIONS Rosuvastatin has demonstrated clinical superiority over atorvastatin, pravastatin, and simvastatin in reducing LDL-C levels and in enabling patients to reach goals established by the JAS.
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Abstract
Initiation and Monitoring of Class III Agents. Dofetilide is a Class III antiarrhythmic agent that is approved by the United States Food and Drug Administration (FDA) for use in the conversion of atrial fibrillation, as well as in the maintenance of normal sinus rhythm. Because of the risk of torsades de pointes associated with dofetilide, the FDA mandated in-hospital initiation of therapy and initially restricted dofetilide's availability to institutions and prescribers who completed appropriate educational forums. The use of dofetilide within health care systems requires specific procedures for prescribing, dispensing, and monitoring, as well as a format for educating personnel who will be involved in the care of these patients. Several models have demonstrated success in initiating dofetilide and are also used for sotalol, which also can cause torsades de pointes. The utilization of nonphysician personnel, such as nurse practitioners and clinical pharmacists, in conjunction with a team approach were essential components for the success of these models. Preprinted order forms or procedural guidelines, as well as computer-assisted dosing programs, can be utilized to prevent inappropriate or miscalculated dosing of these agents, which potentially can cause life-threatening ventricular arrhythmias.
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Affiliation(s)
- Scott Freeland
- From the Department of Pharmacy Services, St. Vincent Hospital and Health Services, Indianapolis, Indiana 46260, USA.
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The statin wars: why AstraZeneca must retreat. Lancet 2003; 362:1341. [PMID: 14585629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
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Kaufmann A, Roth S, Ryser B, Widmer M, Guggisberg D. Quantitative LC/MS-MS determination of sulfonamides and some other antibiotics in honey. J AOAC Int 2002; 85:853-60. [PMID: 12180678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
A simple and rapid method was developed for the determination of 20 antibiotics (sulfonamides, tetacyclines, and flumequine) in honey by liquid chromatography tandem mass spectrometry. The proposed method is sensitive (limit of detection 0.5 to 10 ppb for the various antibiotics) and selective. A hydrolysis step ensures the liberation of sugar-bound sulfonamides. The approach has been used to analyze some 300 honey samples. A number of them were found to have exceeded the Swiss limit of 50 ppb.
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Affiliation(s)
- Anton Kaufmann
- Official Food Control Authority of the Canton of Zurich (Kantonales Labor Zürich), Switzerland.
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Reiffel JA. Is it rational, reasonable or excessive, and consistently applied? One view of the increasing FDA emphasis on safety first for the release and use of antiarrhythmic drugs for supraventricular arrhythmias. J Cardiovasc Pharmacol Ther 2001; 6:333-9. [PMID: 11907635 DOI: 10.1177/107424840100600402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- J A Reiffel
- Electrophysiology Service, Division of Cardiology, Department of Medicine, Columbia University, College of Physicians & Surgeons, New York, USA
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Moodley I. Celecoxib--the debate rages on. S Afr Med J 2001; 91:445-6. [PMID: 11455699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023] Open
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Lindsay DS, Dubey JP. Determination of the activity of pyrimethamine, trimethoprim, sulfonamides, and combinations of pyrimethamine and sulfonamides against Sarcocystis neurona in cell cultures. Vet Parasitol 1999; 82:205-10. [PMID: 10348099 DOI: 10.1016/s0304-4017(99)00020-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Equine protozoal myeloencephalitis (EPM) is a neurologic syndrome in horses from the Americas and is usually caused by infection with the apicomplexan parasite, Sarcocystis neurona. The activities of pyrimethamine, trimethoprim, sulfachloropyridazine, sulfadiazine, sulfadimethoxine, sulfamethoxazole, sulfamethazine, and sulfathiazole were examined against developing S. neurona merozoites in bovine turbinate cell cultures. A microtiter plate host cell lesion based assay was used to determine the effects of agents on developing merozoites. A cell culture flask assay was used to determine if selective concentrations of the agents killed or only inhibited development of S. neurona. Pyrimethamine was coccidiocidal at 1.0 microg/ml and trimethoprim was coccidiocidal at 5.0 microg/ml. None of the sulfonamides had activity when used alone at 50.0 or 100.0 microg/ml. Combinations of sulfonamides (5.0 or 10.0 microg/ml) with 0.1 microg/ml pyrimethamine demonstrated improved activity.
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Affiliation(s)
- D S Lindsay
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland Regional College of Veterinary Medicine, Virginia Tech, Blacksburg 24061-0342, USA.
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Hart RJ, Cavey WA, Moore B, Strong MB. Efficiency and safety of methidathion applied as a pour-on systemic insecticide for control of cattle lice. Aust Vet J 1979; 55:575-9. [PMID: 94259 DOI: 10.1111/j.1751-0813.1979.tb07050.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Methidathion applied to cattle as a pour-on insecticide for control of lice (predominantly Linognathus vituli, but also Haematopinus eurysternus and Damalinia bovis) caused a reduction in the lice population of approximately 98% to 99% in laboratory trials at the minimum recommended dose of 4 mg/kg and a 98.8% to 100% efficiency was achieved in field trials. In a comparative efficiency trial in the laboratory methidathion at 3.5 to 5 mg/kg reduced the lice population by 98.8% to 99%, fenthion by 98.5% at 4.5 mg/kg and famphur by 99.7% at 16.5 mg/kg. Methidathion was tolerated by calves aged 15 to 20 weeks at dose rates up to 40 mg/kg indicating an approximate 7 fold safety margin, but 1 of 4 calves treated at 50 mg/kg died following treatment. Treatment with fenthion at 50 mg/kg, 7.4 times the average recommended rate, famphur at 75 mg/kg, 3 times the average rate and chlorpyrifos at 85 mg/kg, 5 times average rate, caused reductions in whole blood cholinesterase activity of 52%, 27% and 47% respectively which were similar to the reductions in cholinesterase activity found in calves treated with methidathion at similar levels above the recommended commercial dose rates. It was found that 2 day old calves were more sensitive to treatment with methidathion than calves 9 or 16 days old. A further 11,900 cattle of varying age, breed and sex were treated with methidathion under field conditions at the recommended rate of 4 to 8 mg/kg, and 534 cattle were treated at 24 mg/kg without any signs of toxicity.
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Phillips WF, Trafton JE. A screening method for sulfonamides extracted from animal tissues. J Assoc Off Anal Chem 1975; 58:44-7. [PMID: 1141154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A screening method for the estimation of possible residues of sulfonamides in poultry tissues is described. The method utilizes thin layer chromatography (TLC) to separate Bratton-Marshall positive reactants. In the absence of interference and the identification of 1 sulfonamide by TLC, the colorimetric method is recommended for quantitation. When interferences are present, TLC should be used for both qualitative and quantitative analysis. The screening method has a sensitivity of less than 0.05 ppm and a recovery of greater than 80%.
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El-Sebai AI, Beltagy YA, Soliman R. New internal indicators for determining primary aromatic amines. Pharmazie 1971; 26:615-6. [PMID: 5149128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Niess R, Wolf F, Schlenz E. [On the identification of side products in preparation of p-acetylaminomethylbenzolsulfonamide]. Pharmazie 1969; 24:177-8. [PMID: 5787496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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