首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
建立香砂养胃软胶囊中厚朴酚的含量测定方法。方法:用HPLC法,色谱柱:SpherigelODSC18,5μm,(25cm×4.6cm),流动相:乙腈:4.8%冰醋酸(60:40),流速:1mL/min,检测波长:292nm,柱温:25℃。结果:厚朴酚在0.124μg/mL~0.992μg/mL的浓度范围内具有良好的线性关系(r=0.9999),加样回收率为99.77%,重现性RSD=0.85%。结论:本法简单可行,准确性好,重现性高。可以有效控制香砂养胃软胶囊中厚朴酚的含量。  相似文献   

2.
目的:建立乳酸左氧氟沙星氯化钠注射液中主药的含量测定方法。方法:采用反相高效液相色谱法。以Lichrospher5-C18为色谱柱;己烷磺酸钠-甲醇(3:1)为流动相;流速为1.0ml/min;检测波长为293nm,柱温为40℃,进样量为20u1。结果:乳酸左氧氟沙星浓度在5.0-50.0μg/ml内线性关系良好(r=0.9995),平均回收率为99.85%。RSD为0.25%。结论:此法准确可靠,重现性好,能有效控制乳酸左氧氟沙星氯化钠注射液的质量。  相似文献   

3.
建立高效液相色谱法测定广玉兰中小白菊内酯含量的方法.采用ZORBAXSB—C18(4.6mm×150mm,5μm)色谱柱,以甲醇(A)-水(B)为流动相,梯度洗脱(0~10min,10%—48%A;10~20min,48%-80%A),流速1.0mL/min,柱温30℃,检测波长210nm.结果表明,小白菊内酯的线性范围为0.188~2.820μg(r=0.9999),平均回收率(n=9)为99.3%.证实该方法简便、准确、重复性好,可用于广玉兰中小白菊内酯的含量测定.  相似文献   

4.
目的:建立HPLC法测定川滇桤木中绿原酸的含量。方法:采用高效液相色谱法,VenusilXBP-C.。色谱柱(150mm×4.6mm,5μm),流动相为乙腈-0.4%磷酸溶液(8:92),流速为1.0mL/min,检测波长为324nm,柱温25℃。结果:绿原酸在0.1088μg-1.088μg范围内线性关系良好,r=0.9999,平均加样回收率为98.98%,RSD=0.77%(n=6)。结论:本法操作简便、快速、稳定性高、重现性好,可用于川滇桤木中绿原酸含量的测定。  相似文献   

5.
优化测定乳制品中三聚氰胺含量的高效液相色谱方法。色谱条件:ODS—SPe18柱,250mm×4.6mm(i.d.),5μm;流动相:A为离子对缓冲液(2.02g庚烷磺酸钠和2.10g柠檬酸,加入约950mL水溶解,调节pH值至3.0后,定容至1L),B为乙腈,配制比例为85%A+15%B;1.0mL/min;柱温:35℃;波长:242nm;选样量:20灿。结果表明:三聚氰胺标准曲线为Y=-5.582+42.55x,相关系数R=0.9997,在1.0-50.0μg/mL范围内线性关系良好.样品三个浓度水平的加标回收率在90.1—105.9%之间,相对标准偏差为2.04-5.26%。  相似文献   

6.
采用加热回流提取法提取当归龙荟丸中的阿魏酸,并利用色谱柱Agilent C18(4.0·125mm,5.0μm),以甲醇-3%冰醋酸溶液(20:80)为流动相,流速1、0mL/min,柱温:25℃,测定波长:320nm.测定阿魏酸在0.2116-3.174μg范围内线性关系良好(r=0.9995),平均回收率96.7%,RSD=0.4%.  相似文献   

7.
用邻苯二甲醛(OPA)、N-乙酰-L-半胱氨酸为衍生试剂对天冬氨酸对映体进行柱前衍生.采用ZORBAX Eclipse AAA4.6×150mm,5μm色谱柱,以0.05mol/LpH5.08的醋酸钠溶液与甲醇按57:43体积比作为流动相,流速0.5mL/min,柱温40℃下,考察高效液相色谱柱前衍生化法分离测定天冬氨酸对映体的效果.结果显示:在3.5min内分离出天冬氨酸对映体.在20~100nmol/mL线性范围内,线性关系良好,相关系数在0.99915以上,相对标准偏差在0.65%~1.70%之间.该法快速、简便、分离度高,能够完全分离DL-天冬氨酸对映体,并对其他氨基酸对映体的分离有良好的参考价值.  相似文献   

8.
目的:建立高效液相色谱法测定番泻叶中番泻苷A含量的方法.方法:色谱柱:Shim—pack C18色谱柱(4.6mm×250mm,5μm);流动相:四氢呋喃-水-醋酸(13:85:2),流速:1ml/min;检测波长:214nm.结果:番泻苷A进样量在0.062~1.24μg范围内呈良好的线性关系(r=0.9999).结论:该方法简便,准确,重现性好,可作为番泻叶质量控制的方法.  相似文献   

9.
采用离子色谱电导检测法测定皮革制品中Cr(Ⅳ),选用Metrohm86I型离子色谱仪,Metrosep A Supp5—150型阴离子分析柱,12.8mmol/LNa2C03+4.0mmol/LNaHC03淋洗液.在10~100μg/L范围内,Cr(Ⅳ)的浓度与色谱峰面积呈线性关系,线性方程为C×100—2893.72×A+200.136,相关系数为0.9990,最低检测浓度为4μg/L,低、中、高三个浓度的精密度分别为1.60%、1.05%、0.65%,样品加标回收率分别为91.5%、93.6%和92.3%,本方法可用于皮革中Cr(Ⅵ)的测定.  相似文献   

10.
采用色谱柱为Aglient ZORBAX SB-C18(250mm×4.σmm,5μm).流动相为乙腈-0.4%瞵酸溶液(15:85),检测波长327nm,流速为1.0ml·min^-1,柱温为25℃的色谱条件,建立一种测定长由山牛皮杜鹃中绿原酸含量的HPLC方法.结果表明:绿原酸在0.513~10.26μg范围内与峰面积呈良好线性关系,平均回收率为98.9%.该测定方法,简便快捷、结果准确、重现性好.  相似文献   

11.
《海外英语》2007,(5):44-45
It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,  相似文献   

12.
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/  相似文献   

13.
《海外英语》2007,(5):10-11
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?  相似文献   

14.
汉字倒说     
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   

15.
《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   

16.
王菲 《华章》2007,(12):273-273
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   

17.
钱生钱!     
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   

18.
裴水妹 《华章》2007,(11):196
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   

19.
20.
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号