共查询到20条相似文献，搜索用时 922 毫秒
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目的:建立翻白草中山奈酚、槲皮素含量的高效液相色谱测定方法;方法:采用D iamonsilTMC18柱(4.6mm×150 mm,5μm),以M eOH-0.3%H3PO4(4:6,t/v)为流动相,365 nm波长,流速为1.0 mL.m in-1;结果:待测组分与其它组分分离良好(R>1.5),2组分平均回收率分别为99.2%,RSD=0.6%;99.1%,RSD=2.4%;结论:该方法操作简单、易行,重现性好,可为该原料药及制剂的质控提供参考。 相似文献
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目的:采用高效液相色谱仪测定绞股蓝样品中中槲皮素的含量.方法:色谱柱:Kromasil C18(250 mm×4.6 mm,5μm),流动相:甲醇:0.3%醋酸=6:4,流速:1.0 m L·min-1,检测波长为365 nm,柱温为35℃.结果:样品中待测组分与其他组分分离良好(R>1.5),槲皮素的线性范围0.06μg~0.3μg,r=0.9999,样品平均加标回收率99.4%(RSD=1.2%).结论:该方法简便、易控,准确可靠,可供绞股蓝有效成分分析及质量控制参考. 相似文献
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HPLC法测定金花葵花中金丝桃苷的含量 总被引：2，自引：0，他引：2
目的:采用HPLC法测定金花葵花中金丝桃苷的含量.方法:用Inertex C18柱(4.6×250mm,5μm),流动相为甲醇-0.05%磷酸溶液(60:40,V/V),流速为1.0mL/min,检测波长为360nm,柱温为25℃,进样:10μL.结果:金花葵花中金丝桃苷的含量为0.258%,RSD=1.9%.结论:金花葵花中金丝桃苷的含量较高,有很好的开发前景. 相似文献
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目的:建立反相高效液相色谱法测定气滞胃痛颗粒中柚皮苷和橙皮苷的方法.方法:采用SHIMAD-ZU VP-ODS(4.6mm×150mm,5μm)色谱柱;乙腈-pH3.5磷酸水=22:78(v/v)为流动相,流速为1.2 ml·min-1;检测波长为283nm.结果:待测组分与其他组分分离度良好(>1.5),柚皮苷和橙皮苷线性范围分别为2.8-56.0μg·ml-1和0.43-8.6μg·ml-1,柚皮苷和橙皮苷的平均回收率分别为98.9%,99.6%,RSD分别为1.7%,2.0%.结论:本方法简便,准确度和精密度均能满足橙汁饮料中橙皮苷、柚皮苷测定的要求. 相似文献
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《赤峰学院学报(自然科学版)》2020,(3)
目的:建立测定椿皮中铁屎米-6-酮含量的HPLC方法.方法:采用色谱柱Ultimate AQ-C_(18)(50mm×4.6mm,5μm),流动相为乙腈-0.1%乙酸(35:65),检测波长254nm,流速1.0mL·min~(-1),柱温30℃,进样量20μL.结果 :铁屎米-6-酮进样浓度在1.10～15.35μg·mL~(-1)(r=0.9994)的范围内与峰面积线性关系良好,平均回收率(n=6)为99.66%,RSD值为1.38%.结论:建立的方法简便可靠稳定,为椿皮质量的分析及评价提供参考. 相似文献
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测定维生素A的三种方法比较 总被引：4，自引：0，他引：4
目的:比较测定维生素A含量的3种不同方法,为维生素A及其制剂的质量研究提供参考。方法:分别采用紫外(UV)三点校正法与正、反相高效液相色谱法(HPLC)测定维生素A含量。UV三点校正法以环己烷为溶剂,按照三点校正法测定;NP-HPLC采用Hypersil SiO2柱(250mm×4.6mm,5μm),流动相为正己烷-异丙醇(99.8∶0.2);RP-HPLC采用C18柱(150mm×4.6mm,5μm),流动相为甲醇-水(97∶3)。结果:UV三点校正法测得VA含量为95.5%,RSD=1.3%(n=5);NP-HPLC为112.5%,RSD=3.2%(n=5);RP-HPLC为102.3%,RSD=1.0%(n=5)。结论:UV三点校正法和RP-HPLC法操作简单易行,NP-HPLC法能较好地控制杂质,但系统稳定性相对较差。 相似文献
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目的:建立测定夏桑菊颗粒中绿原酸含量的方法.方法:采用反相高效液相色谱法.色谱柱为DikmaDiamonsil(TM)(钻石)C18柱(200mm×4.6mm,5μm),流动相为乙腈-0.1mol/LNaH2PO4(用磷酸调pH至3.0)(10∶90),流速为1mL·min-1,检测波长为327nm.结果:绿原酸进样量在0.0220～0.2200μg范围内线性关系良好(r=0.9998),测得平均回收率为99.3%,RSD为1.35%.结论:方法准确可靠. 相似文献
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目的:建立2,3-二甲基-6-氨基-2H吲哚盐酸盐中乙酸的高效液相色谱含量测定方法.方法:采用反相高效液相色谱法,TSKgel ODS-100V色谱柱(4.6×150mm,5μm),以0.05%磷酸-甲醇溶液梯度洗脱,流速1.0m L/min,柱温30℃,检测波长为210nm.结果:混合溶液中乙酸与供试品分离度良好,空白溶剂无干扰;乙酸检测限为0.30μg/m L、乙酸定量限为1.00μg/m L;乙酸在1.00μg/m L~100.10μg/m L浓度范围内线性关系;平均加样回收率100.3%;精密度良好、重复性、稳定性良好;耐用性良好;三批供试品乙酸含量均小于含量限度(0.05%),符合规定.结论:该方法可用于测定2,3-二甲基-6-氨基-2H吲哚盐酸盐中的乙酸含量. 相似文献
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目的:研究不同采收期迷迭香中迷迭香酸的积累动态规律.方法:样品采用超声提取,高效液相色谱法测定迷迭香不同采收季节中迷迭香酸的含量.色谱柱:PLATISILTMODS(250 mm×4.6 mm,5μm),流动相为V(0.1%磷酸溶液):V(甲醇)=(46:54),流速:0.8(ml/min),检测波长为330 nm,柱温为35℃.结果:待测组分与其他组分分离度良好(R>1.5),迷迭香酸在0.348μg6.96μg范围内呈良好的线性关系(r=0.9999);平均回收率为99.96%,RSD为0.09%.迷迭香酸在一年生长期中的含量随着季节变化存在较为规律的梯度变化趋势,从1月开始,呈现出先降低-升高-降低-升高-降低-升高的趋势,在新芽生长期含量较低,秋冬季平均含量高于春夏季.结论:迷迭香酸的含量随植物生长期不同而变化,实验结果为迷迭香中迷迭香酸的含量测定及药材质量控制提供实验依据. 相似文献
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目的:用高效液相色谱法测定注射用肌苷的含量.方法:采用Kromasil C18柱(5μm 4.6mm×250mm),以甲醇-水(10∶90)作流动相,在248nm紫外波长检测.结果肌苷在4.23～63.48μg/ml范围内有良好的线性关系(r=0.9999).低、中、高3个浓度的平均回收率(n=2)分别为101.4%、101.8%、101.1%,RSD为0.46%.结论:该法简便、快速、准确,可作为测定注射用肌苷中肌苷的含量. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献