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1.
目的建立水飞蓟药材的HPLC指纹图谱分析方法,并对不同产地水飞蓟药材进行指纹图谱比较研究。方法采用反相高效液相色谱法,Shimadzu C18(150 mm×4.6 mm)为色谱柱,流动相为甲醇-水-冰醋酸(48:52:1),流速:1.0 mL/min,检测波长为287 nm,柱温40℃,进样量10μl。对水飞蓟药材的指标成分水飞蓟宾进行了定性定量,并以相似度鉴别药材质量。结果建立了水飞蓟药材的HPLC指纹图谱,标定了12个共有峰,方法学考察结果符合指纹图谱技术要求,经相似度计算11个不同产地药材之间的相似性均高于0.944。结论本法简便准确、结论可靠,可用于不同产地水飞蓟药材的指纹图谱测定和质量评价,为有效控制水飞蓟药材的内在质量提供了实验依据。  相似文献   

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采用Phenomenex C18色谱柱(250 mm×4.6 mm,5μm),以甲醇-乙腈-0.3%磷酸水为流动相进行梯度洗脱,建立芦荟的指纹图谱。运用化学模式识别方法对不同产地芦荟药材质量控制方法进行评价。结果表明:12批芦荟HPLC指纹图谱共标定23个共有峰,并通过对照品指认其中6个成分;除了广西的3批药材之外,其他药材相似度都在0.93以上;聚类分析和主成分分析将12批芦荟分为3类;利用正交偏最小二乘判别法筛选出芦荟药材差异的5个色谱峰,并以相同HPLC法对其进行含量测定。本文将HPLC指纹图谱与化学模式识别相结合的方法简便准确,为芦荟药材的质量控制和品质评价提供依据。  相似文献   

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王跃峰  冯旭  苏健  傅鹏  邱骥鹏  朱华 《广西植物》2018,38(5):577-582
为了对广西产拳卷地钱药材进行质量控制,采用HPLC指纹图谱法对8批药材进行了研究,色谱条件为安捷伦ZORBAX SB-C18色谱柱(4.6 mm×250 mm,5μm),流动相为乙腈(B)-0.1%磷酸水溶液(D),梯度洗脱,检测波长为230 nm,柱温为25℃。结果表明:建立了参考指纹图谱,共有峰6个,8批广西产拳卷地钱药材HLPC指纹图谱相似度均大于0.75,其精密度、重复性、稳定性实验均符合指纹图谱技术要求。HPLC指纹图谱分析,数据稳定可靠,方法简便高效,可为广西产拳卷地钱质量评价提供参考。  相似文献   

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通过比较吉林产不同种蒲公英HPLC指纹图谱,探讨吉林产蒲公英HPLC指纹图谱的特点,为蒲公英药材的质量控制提供理论参考。采用HPLC方法,以Agilent Extend-C18(250 mm×4.6 mm,5μm)为色谱柱,以甲醇-0.5%冰醋酸水溶液梯度洗脱;检测波长为323 nm,流速为1.000 mL·min-1,柱温35℃,进样量为20μL,检测了12种吉林产不同种类蒲公英药材,确立了9个共有峰,建立了蒲公英对照指纹图谱,计算各被测样品的HPLC指纹图谱的整体相似度,并指认了绿原酸、咖啡酸、总黄酮3个特征峰,比较了上述成分在不同药材中的含量,定量结果表明,3种成分平均含量分别为0.027%、0.026%、0.128%。所建立的指纹图谱具有良好的精密度、重现性和稳定性,可作为吉林产蒲公英药材的质量控制标准。  相似文献   

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建立战骨药材及其复方制剂的HPLC指纹图谱分析及牡荆素的HPLC含量测定方法,并考察牡荆素在跌打生骨胶囊制备过程中的含量变化。采用Waters Xbridge C18(4.6 mm×250 mm,5μm)色谱柱;流动相为乙腈-0.5%冰醋酸水溶液,梯度洗脱;流速为1.0mL/min;检测波长为350 nm;柱温:25oC。结果表明牡荆素在0.16~0.80μg范围内线性关系良好(R2=0.9996);10批战骨药材的指纹图谱有19个共有特征峰,其峰面积占总峰面积的90%以上。每克药材含牡荆素在15.8~30.2μg之间。制备胶囊的稠膏及内容物颗粒未检出牡荆素。表明本实验建立的HPLC方法可用于测定战骨药材中牡荆素的含量,而不适用于其复方制剂中牡荆素的含量测定。  相似文献   

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目的:建立紫花地丁药材HPLC指纹图谱,提供药材质量控制的可靠方法。方法:采用HPLC方法,以Agi-lent C18(4.6 mm×250 mm,5μm)为色谱柱,甲醇-0.5%醋酸水溶液进行梯度洗脱;检测波长353 nm,流速1.0mL/min。结果:检测了12批不同来源的紫花地丁药材,确立了18个共有峰,建立了紫花地丁对照指纹图谱,计算各被测样品的HPLC指纹图谱的整体相似度,并指认了菊苣苷、七叶内酯、东莨菪素、早开堇菜苷4个特征峰,比较了上述成分在不同药材中的含量。结论:所建立的指纹图谱具有良好的精密度、重现性和稳定性,可作为紫花地丁药材质量控制标准。  相似文献   

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不同产地野生与栽培伊贝母药材水溶性成分指纹图谱研究   总被引:1,自引:0,他引:1  
目的:建立伊贝母药材水溶性成分高效液相色谱指纹图谱,为科学评价和有效控制其质量提供可靠的方法。方法:采用HPLC-DAD方法,以Kromasil C18色谱柱(4.6 mm×150 mm,5μm),流动相为甲醇和水,梯度洗脱,流速0.5 mL·min-1,柱温25℃,检测波长:260 nm。采用药典委员会颁布的中药色谱指纹图谱相似度评价系统2004 A版软件,对29批野生与栽培伊贝母药材进行指纹图谱分析。结果:29批伊贝母药材中有14个共有特征峰,建立了HPLC指纹图谱共有模式。各批次伊贝母药材相似度都在0.714以上,29批野生与栽培伊贝母药材可通过系统聚类分成5类,不同产地野生与栽培药材组成质量相似性较好,并定量测定了样品中的β-胸苷和腺苷。结论:所建立的HPLC指纹图谱及定量分析均具有良好的精密度、重复性、稳定性,可用于伊贝母药材的质量综合评价。  相似文献   

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目的:建立鹅不食草的HPLC指纹图谱,并对其化学成分进行表征。方法:指纹图谱采用Alltima~(TM)C_(18)色谱柱(250 mm×4.6 mm,5μm),柱温为35℃,流动相为乙腈-0.2%磷酸溶液,梯度洗脱;流速为1.0 m L/min;检测波长为290 nm,进样量为20μL。成分表征采用UPLC-QTOF-MS分析,Waters ACQUITY HSS T3(2.1 mm×100 mm,1.8μm)色谱柱,0.1%甲酸乙腈(A)-0.1%甲酸水(B)梯度洗脱,ESI离子源,正离子与负离子模式下采集数据。结果:通过12批鹅不食草的HPLC指纹图谱分析,确定了13个特征峰,12批样品的相似度在0.837~0.997之间;UPLC-QTOF-MS鉴别出26个化学成分,其中Dulcoside A、Kaurane pentanedioic acid derivative及3’,4’-didesulphatedcarboxyatractyloside等二萜苷类化合物系首次在鹅不食草药材中发现。结论:本研究建立的HPLC指纹图谱和化学成分表征信息具有"全息"特征,可为鹅不食草药材整体质量评价提供科学依据。  相似文献   

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应用HPLC方法测定了薯蓣属根状茎组10种1亚种1变种植物23个样本,建立了萆薢类药材总皂苷元粗提物的HPLC指纹图谱.色谱柱为Zorbax Eclipse XDB-C_(18)柱(4.6×250 mm,5 μm),流动相为乙腈-水,柱温30℃,检测波长为203 nm.结果表明,用上述条件所建立的指纹图谱共标示出7个共有峰,且可较全面地反映萆薢类药材的皂苷元类成分,为萆薢类药材薯蓣属根状茎组植物鉴别及质量控制提供一种方法.  相似文献   

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为建立桔梗HPLC指纹图谱并对其质量控制方法进行探讨。研究采用YMC Hydrosphere C_(18)分析色谱柱(250×4.6 mm,5μm),以水和乙腈为流动相进行梯度洗脱,检测波长210 nm。建立不同产地15批桔梗药材HPLC指纹图谱。采用相似度评价、聚类分析、主成分分析和正交偏最小二乘判别分析等化学模式识别方法对不同产地桔梗质量及其控制方法进行分析和评价。建立的桔梗HPLC指纹图谱共标定21个共有峰,并通过对照品指认其中7个成分;不同产地桔梗相似度在0.927~0.991之间;聚类分析和主成分分析结果都将15批桔梗分为3类,利用正交偏最小二乘判别分析筛选出造成桔梗差异的13个色谱峰。本研究建立的HPLC指纹图谱结合化学模式识别的方法简便准确,能够为桔梗的质量控制和品质评价提供依据。  相似文献   

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In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980.  相似文献   

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Shapes of curves of pH-dependence of reactions   总被引:14,自引:14,他引:0  
A simple case is considered in which the rate of a two-step reaction depends on pH because the intermediate formed in the first step has to gain (or lose) a proton before it can react in the second step, and in which the rate-determining step therefore changes with pH. The curves of reaction rate against pH are shown to be symmetrical, and the sharpest peak possible has a width at half its height of 1.53pH units, i.e. of 2log(3+2 radical2). Any particular curve for this situation proves to be identical with a curve that could be generated for the pH-dependence of a single-step reaction in which the rate is proportional to the concentration of a particular ionic form of a reactant. Curves for the latter situation, however, can have forms impossible for the former case in which the rate-determining step changes, but only if the protonations that activate and deactivate the reactant are co-operative. The peak can then become even sharper, and its width at half its height can fall to 1.14pH units, i.e. to 2log(2+ radical3).  相似文献   

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Dietary intakes of tomatoes and tomato products containing lycopene have been shown to be associated with decreased risk of chronic diseases such as cancer and cardiovascular diseases in numerous studies. Serum and tissue lycopene levels have also been inversely related to the risk of lung and prostate cancers. Lycopene functions as a very potent antioxidant, and this is clearly a major important mechanism of lycopene action. In this regard, lycopene can trap singlet oxygen and reduce mutagenesis in the Ames test. However, evidence is accumulating for other mechanisms as well. Lycopene at physiological concentrations can inhibit human cancer cell growth by interfering with growth factor receptor signaling and cell cycle progression specifically in prostate cancer cells without evidence of toxic effects or apoptosis of cells. Studies using human and animal cells have identified a gene, connexin 43, whose expression is upregulated by lycopene and which allows direct intercellular gap junctional communication (GJC). GJC is deficient in many human tumors and its restoration or upregulation is associated with decreased proliferation. The combination of low concentrations of lycopene with 1,25-dihydroxyvitamin D3 exhibits a synergistic effect on cell proliferation and differentiation and an additive effect on cell cycle progression in the HL-60 promyelocytic leukemia cell line, suggesting some interaction at a nuclear or subcellular level. The combination of lycopene and lutein synergistically interact as antioxidants, and this may relate to specific positioning of different carotenoids in membranes. This review will focus on the growing body of evidence that carotenoids have unexpected biologic effects in experimental systems, some of which may contribute to their cancer preventive properties in models of carcinogenesis. Consideration of solubility in vitro, comparison with doses achieved in humans by dietary means, interactions with other phytochemicals, and other potential mechanisms such as stimulation of xenobiotic metabolism, inhibition of cholesterogenesis, modulation of cyclooxygenase pathways, and inhibition of inflammation will be considered. This review will point out areas for future research where more evidence is needed on the effects of lycopene on the etiology of chronic disease.  相似文献   

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