RP-HPLC法同时测定金匮肾气片中黄芩苷和丹皮酚的含量

目的:建立同时测定金匮肾气片中黄芩苷和丹皮酚含量的高效液相色谱法。方法:采用C18色谱柱(4.6 mm×250 mm,5μm),以甲醇-0.1%磷酸水溶液(52:48),检测波长278 nm,柱温30℃,流速1.0 mL/min。结果:黄芩苷在0.485~19.406μg/mL,丹皮酚在1.079~43.157μg/mL线性关系良好。平均回收率(n=9)分别为99.6%,100.5%,含量测定结果表明,不同批次金匮肾气片之间黄芩苷和丹皮酚含量水平差异不大。结论:经方法学验证,该法可用于金匮肾气片中黄芩苷和丹皮酚含量的快速测定。     

HPLC法测定椿皮中铁屎米-6-酮生物碱的含量

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.     

HPLC法测定复方抗溃混悬液中盐酸小檗碱的含量

目的:建立测定复方抗溃混悬液中盐酸小檗碱含量的方法;方法:用高效液相色谱法测定含量,采用ZORBAX Eclipse XDB -C18色谱柱,流动相为乙腈-0.1％磷酸溶液(50:50)(每100 mL加十二烷基磺酸钠0.1 g),检测波长345砌,流速1.0 mL/min.结果:盐酸小檗碱的线性范围为6.175 ～61.75μg/mL(r=0.9998),平均回收率为99.3％,RSD为0.69％(n=6),复方抗溃混悬液中小檗碱含量为1.02～1.05 mg/g.结论:试验表明该方法可用于复方抗溃混悬液的质量控制,该方法专属性强、操作简便.     

高效液相色谱法测定阿苯达唑原料药的含量

为建立一种阿苯达唑原料药含量测定的高效液相方法,采用方法:色谱条件:Agilent ODS C18(5μm,3.0×150mm)色谱柱;以甲醇为流动相A;磷酸二氢钠水溶液(11g→800ml)为流动相B,甲醇—磷酸二氢钠水溶液=65:35时,流速为0.8ml/min,阿苯达唑对照品主峰保留时间为3.044min;分离度良好,扫描波长为292nm,柱温:30℃,结果阿苯达唑原料及溶剂峰均得到良好分离。阿苯达唑在2μg/ml¹200μg/ml浓度范围内线性良好(R2=0.99999,n=6),平均回收率98.0%,RSD为0.5%,定量限为0.1μg/ml,并得出结论:高效液相色谱法灵敏、准确,专属性强,重现性好,可用于阿苯达唑原料药含量的测定及质量控制。     

超声提取-高效液相色谱测定滁菊中的木犀草素

为建立超声波提取-高效液相色谱法测定滁菊中木犀草素的方法。采用purospher star RP-18(250 mm×4.6 mm,5μm)色谱柱;以0.1%磷酸溶液(pH=2.6)-甲醇(40:60)为流动相;流速为1 mL/min;检测波长为327 nm。结果表明,木犀草素在10 min内实现快速基线分离,且在0.002~0.05 mg/mL范围内线性关系良好,r=0.9999,平均回收率为99.22%,RSD为1.7%(n=3)。该方法简便快速,可作为滁菊原药材的质量标准。     

气相色谱法测定青蒿提取物中二十八烷醇和二十六烷醇的含量

建立青蒿素提取物中二十八烷醇、二十六烷醇含量检测的气相色谱方法.采用毛细管色谱柱BD-17(30m×530μm×1.0μm);FID检测器;气化室温度269℃;柱温为一级程序升温(155℃-2min-10℃·mim-1-262℃-12min);载气高纯氮42.0mL/min;空气410.0mL/min;氢气38.0mL/min.平均回收率:二十八烷醇为100.16%(n=5),RSD为0.91%;二十六烷醇为98.5%(n=5),RSD为1.23%.该方法准确、灵敏、重现性好,可适用于提取分离二十八烷醇、二十六烷醇时质量控制和含量检测.     

RP-HPLC法同时测定石榴皮和石榴汁中鞣花酸的含量

目的:建立同时检测石榴皮、汁中鞣花酸的含量测定方法.方法:采用反相高效液相色谱法,Hyperil C18(250 mm ×4.6 mm,5μm)色谱柱,以乙腈-0.3％ TFA(20∶80)为流动相,梯度洗脱,流速1.0mL/min,柱温30℃,检测波长254nm.结果:鞣花酸0.1048 ～ 20.96 μg/mL之间线性关系良好(r=0.9999),平均加样回收率为99.55％(RSD=1.44％,n=9).结论:此方法灵敏快速、准确易行,可用于石榴皮、汁中鞣花酸含量的同时检测.     

高效液相色谱法测定辣椒中维生素C的含量

文章建立了一种高效液相色谱测定辣椒中维生素C含量的方法.采用0.1%的草酸作为提取剂,色谱中采用Hypersil-C18色谱柱,pH=6,0.05mol/L磷酸二氢钾缓冲溶液:甲醇=95∶5(v/v)作流动相.流速1.0 ml/min,DAD检测器,检测波长254 nm.维生素C在20—100 mg/L内有良好的线性关系,线性回归方程为y=29.664x-12.37,相关系数为0.9953,方法回收率为91.24%-105.6%,相对标准偏差小于2%.本文测定方法简便,快速,能准确测定辣椒中维生素C的含量.     

HPLC测定利胆消炎颗粒中黄芩苷的含量

目的:采用高效液相色谱法测定利胆消炎颗粒中黄芩苷的含量.方法:色谱柱为Waters C18柱,流动相为甲醇-0.2%磷酸溶液(47:53),检测波长为280nm,流速为1.0mL/min.结果:黄芩苷进样量线性范围是10.0μg/mL～100μg/mL(r=0.9999),平均加样回收率98.80%,RSD=1.70%(n=6).结论:该方法简便、灵敏,可用于制剂的质量控制.     

RP-HPLC法同时检测石榴皮3种多酚类提取物含量研究

采用RP-HPLC法,Symmetry C18(250 mm×4.6 mm, 5μm)色谱柱,以甲醇(A)-0.2%磷酸溶液(B)为流动相梯度洗脱,流速1.0 mL/min,柱温30℃,检测波长272 nm同时检测安石榴苷、鞣花酸和没食子酸含量。采用SPSS 17.0对测定结果进行分析,比较不同品种石榴皮中各成分的含量差异。结果表明,安石榴苷、鞣花酸、没食子酸分别在13.120～209.92μg/mL,13.325～213.20μg/mL和13.275～212.40μg/mL与峰面积呈线性关系,平均加样回收率为97.58%(RSD:1.02%,n=6),99.31%(RSD:0.94%,n=6)和98.63%(RSD:0.70%,n=6)。白玉石榴皮中安石榴苷、鞣花酸的含量分别为7.13%和1.00%,比红酸石榴皮中的含量高。安徽地区石榴皮中安石榴苷、鞣花酸、没食子酸3种成分含量同时检测方法的灵敏度高、准确度好、重现性一致,可用于安徽本地石榴皮部位中安石榴苷、鞣花酸、没食子酸成分含量同时检测。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

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.