共查询到16条相似文献,搜索用时 46 毫秒
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匹莫苯丹是国家二类新兽药。但由于该药的原料药成本较高,不易合成,反应步骤多而限制了该药物的临床普遍应用。因此,进行了对匹莫苯丹合成工艺的调查,概述了近年来国内外关于匹莫苯丹的10个合成方法。主要包括以氯苯、乙酰苯胺、对氯苯甲醛、3-(4-乙酰胺基苯甲酰基)-丁腈、邻苯二乙酸二铵和5-(2-溴代丙酰基)-1,3-2H-苯丙[d]咪唑-2-酮为起始原料合成制备匹莫苯丹,并分析了这些合成方法中存在的问题,还考察了匹莫苯丹副产物的产生和解决办法,为其工业化合成研究提供参考。 相似文献
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(目的)本文旨在联合使用质量平衡法与差示扫描量热法2种定值方法测定非班太尔对照品的含量。(方法)采用高效液相色谱法测定非班太尔的纯度,采用卡尔费休氏容量滴定法、炽灼残渣检查法、气相色谱法分别测定其水分、灰分和残留溶剂,由质量平衡法公式计算非班太尔对照品的含量;采用差示扫描量热法对非班太尔对照品含量加以佐证。(结果)质量平衡法和差示扫描量热法测定结果经科克伦判定互为等精度,取其算术平均值作为最终定值结果,即非班太尔对照品含量为99.66%。(结论)质量平衡法与差示扫描量热法对非班太尔对照品的定值结果基本一致,2种方法能够更好地保证非班太尔对照品赋值的准确性。 相似文献
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盐酸阿苯达唑亚砜对照品候选物纯度检测方法的建立 总被引:2,自引:1,他引:1
以盐酸阿苯达唑亚砜原料为基础,通过反复提纯,得到盐酸阿苯达唑亚砜对照品候选物,该候选物经过熔点,薄层色谱法(TLC)和高效液相色谱法检测,初步确认符合对照品的要求,经过高效液相色谱检测,采用面积归一化法计算其纯度不小于99.5%。该方法的建立为盐酸阿苯达唑对照品进一步研究提供了帮助。 相似文献
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以甘草苷为例,梳理兽用中药化学对照品标定的研究方法、技术要点,分析常见问题并探讨相应的解决方案。主要围绕标定过程中的结构鉴别、纯度分析、水分测定、无机盐测定、定值等环节存在的问题进行个性化分析,为兽用中药化学对照品的标定、使用提供思路及技术支持,对未来发展方向提出建议。 相似文献
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为建立高效液相色谱法测定阿苯达唑含量,实验优化出最佳色谱条件:检测波长为295 nm,流动相为甲醇﹕水=70﹕30,流速0.8 mL/ min,色谱柱为Shim-pack VP-ODS(150 mm?4.6 mm,5 μm);柱温为室温。结果显示:阿苯达唑的浓度在1~1000 μg/ mL范围内,峰面积与浓度呈良好的线性关系,R2=1;加样平均回收率为98.1﹪,RSD为0.5﹪;检出限和定量限分别为0.03 μg/ mL和0.1 μg/ mL。该方法简便、快速、准确、重现性好,可用于阿苯达唑的含量测定及质量控制。 相似文献
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建立了一种用于测定卡巴匹林钙产品及反应液中尿素含量的高效液相色谱法。确立了最佳色谱条件,色谱柱为Waters Xselect HSS T3 C18(4.6 mm×250 mm,5μm),流动相为甲醇-水(5∶95,V/V),检测波长为195 nm,流速为0.5 mL/min,柱温30℃,进样量10μL。结果显示,尿素浓度在0.12~120μg/mL范围内具有良好的线性关系(r>0.999);尿素的检出限为0.05μg/mL,定量限为0.1μg/mL;分离度R>1.5,重复性的相对标准偏差<1.0%(n=6);卡巴匹林钙产品中尿素的回收率范围为98.10%~100.46%,反应液中尿素的回收率范围为95.32%~101.20%。本方法操作简便、准确度高、重复性好、检测速度快,在合成工艺中对卡巴匹林钙产品及反应液中尿素的质量控制具有重要意义。 相似文献
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M.B. Sayer C.E. Atkins Y. Fujii A.K. Adams T.C. DeFrancesco B.W. Keene 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2009,23(5):1003-1006
Background: The renin-angiotensin-aldosterone system (RAAS) is activated in states of decreased cardiac output and by certain cardiovascular therapeutic agents, such as loop diuretics and vasodilators.
Hypothesis: Short-term treatment with the inodilator, pimobendan, will not activate the circulating RAAS because its vasodilatory action will be offset by its positive inotropic property, thereby ameliorating RAAS stimulation at the juxtaglomerular apparatus. Furthermore, pimobendan will suppress RAAS activation produced by furosemide.
Animals: Nine healthy laboratory dogs were used in this study.
Methods: Experimental, cross-over study. Dogs were administered pimobendan (0.5 mg/kg q12h) for 4 days followed by furosemide (2 mg/kg q12h) and then, after a wash-out period, a combination of the drugs. Aldosterone : creatinine (A : Cr) was measured at the end of each treatment cycle.
Results: There was no significant increase in the average urinary A : Cr with the administration of pimobendan (control urinary A : Cr = 0.46, standard deviation (SD) 0.33; pimobendan A : Cr = 0.48, SD 0.28). There was a significant increase in the average urinary A : Cr after administration of furosemide (urinary A : Cr = 1.3, SD 0.70) and with the combination of furosemide and pimobendan (urinary A : Cr = 2.9, SD 1.6).
Conclusions and Clinical Relevance: Short-term administration of high-dose pimobendan, does not activate the RAAS in healthy dogs. Pimobendan did not prevent RAAS activation associated with furosemide therapy. These results in healthy dogs suggest that furosemide therapy, with or without pimobendan, should be accompanied by RAAS suppressive therapy. 相似文献
Hypothesis: Short-term treatment with the inodilator, pimobendan, will not activate the circulating RAAS because its vasodilatory action will be offset by its positive inotropic property, thereby ameliorating RAAS stimulation at the juxtaglomerular apparatus. Furthermore, pimobendan will suppress RAAS activation produced by furosemide.
Animals: Nine healthy laboratory dogs were used in this study.
Methods: Experimental, cross-over study. Dogs were administered pimobendan (0.5 mg/kg q12h) for 4 days followed by furosemide (2 mg/kg q12h) and then, after a wash-out period, a combination of the drugs. Aldosterone : creatinine (A : Cr) was measured at the end of each treatment cycle.
Results: There was no significant increase in the average urinary A : Cr with the administration of pimobendan (control urinary A : Cr = 0.46, standard deviation (SD) 0.33; pimobendan A : Cr = 0.48, SD 0.28). There was a significant increase in the average urinary A : Cr after administration of furosemide (urinary A : Cr = 1.3, SD 0.70) and with the combination of furosemide and pimobendan (urinary A : Cr = 2.9, SD 1.6).
Conclusions and Clinical Relevance: Short-term administration of high-dose pimobendan, does not activate the RAAS in healthy dogs. Pimobendan did not prevent RAAS activation associated with furosemide therapy. These results in healthy dogs suggest that furosemide therapy, with or without pimobendan, should be accompanied by RAAS suppressive therapy. 相似文献
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为了有效控制泰拉霉素原料及注射液的产品质量,研制了泰拉霉素国家对照品。采用精制后的泰拉霉素为原料进行本批对照品的研制,原料分装后进行质量检测及均匀性评价,并标定含量。采用红外分光光度法、费休氏水分测定法等对其进行理化分析,利用高效液相色谱法进行有关物质测定及均匀性检验,采用质量平衡法进行标准物质含量计算,并通过差示扫描量热法对质量平衡法的准确性进行验证。研制的泰拉霉素国家对照品的含量为98.3%,采用多种不同方法对本品进行定性与定量研究,确保了国家标准物质标定结果的准确性。本对照品可用于泰拉霉素原料及注射液的鉴别与含量测定,对于提高和保证兽药产品质量具有重要意义。 相似文献
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Cows' urine was analysed by gas chromatography–mass spectrometry (GC-MS). The profiles from preovulatory, ovulatory and postovulatory samples were compared to establish any qualitative and quantitative differences that might have potential value in olfactory communication. Dichloromethane was used as the solvent for extraction of the compounds. Seven different compounds were detected, of which only two were common to all the chromatograms. The chemical profile of oestrous urine was distinguished by the presence of two specific compounds, viz. di-n-propyl phthalate and 1-iodoundecane, that were not found in the other samples. As oestrous urine has been shown to elicit sexual behaviour in cattle, these two characteristic peaks may represent important chemical compounds that elicit signals that allow the bull to detect `oestrous odours'. 相似文献
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鸭茅为世界重要禾本科牧草之一,多为四倍体或二倍体。快速鉴定其倍性可为鸭茅遗传背景研究及多倍体材料的创制提供技术支撑,加快育种进度。采用流式细胞术,筛选4种细胞核DNA解离液,对比2种流式细胞仪检测方法,最终建立鸭茅倍性鉴定高效技术体系。结果表明,不同解离液处理后的细胞核DNA含量存在一定差异。利用Otto制备鸭茅细胞核悬浮液效果较理想,峰型完整,碎片峰较少且样本峰信号清晰,其荧光变异系数为5%左右。内外标法检测各有优势,外标法检测更快速更简便,而内标法准确性更高。在以外标检测为主的基础上,共在46份鸭茅材料中鉴定出二倍体鸭茅22份,四倍体鸭茅24份,为鸭茅遗传育种提供材料。 相似文献
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为了提高日常奶粉中胆固醇的检测效率,本文建立了一种更为便捷的气相色谱法检测奶粉中的胆固醇。通过乙醇和氢氧化钾溶液对奶粉试样进行皂化反应,再以石油醚对样液中的胆固醇组分进行提取,最后通过平行浓缩仪将提取液浓缩至近干,再以正己烷定容,采用气相色谱分析法,外标法定量。本方法具有检出限低、精密度高、正确度高、操作过程简便、效率更高简便等优点。 相似文献