共查询到20条相似文献，搜索用时 500 毫秒
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邵建兵 《泰州职业技术学院学报》2010,10(3):36-37,71
目的研究建立氢化可的松洗剂及霜剂的含量测定方法。方法采用旋光法测定氢化可的松洗剂及霜剂的含量。结果氢化可的松在3．5—12．0mg·mL-1浓度范围内,旋光度与浓度呈良好线性关系,回归方程Y=3．3481X-0．03685（r=0．9999）,平均回收率：氢化可的松洗剂为100．3％,RSD为O．52％;氢化可的松霜剂为99．7％,RSD为O。75％,（n=5）。结论本法操作简便准确,可作为两种制剂的质量控制方法。 相似文献
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目的：建立胡黄连中胡黄连苷I的含量测定方法。方法：采用双波长薄层色谱扫描法。结果：胡黄连苷I在0．605-3．025μg范围内呈良好的显性关系,回归方程Y=1431．7X＋189．67,r=0．999,平均回收率98．37％,RSD=1．90％。结论：本方法操作简便,结果准确,精密度好。 相似文献
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对薄层色谱法测定辅酶Q0的操作条件进行探索。选择了以丙酮为溶剂对样品进行溶解，以石油醚-乙酸乙酯（体积比9：4）为展开剂上行展开，密封展板后在波长269nm下进行测量。其定性检测结果：各组分分离良好，斑点集中且清晰。定量检测结果：线性范围为0．4～6μg，线性方程为Y（μv）=10195．6＋30544．6X（μg）（n=6），相关系数为0．9983，加标回收率94．6％，仪器精密度RSD：0．07％（n=3），同板精密度RSD=0．79％（n=3）。 相似文献
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张成志 《乐山师范学院学报》2008,23(12):36-37
为了建立坤复康胶囊中苦参碱含量的高效液相色谱测定方法,文章采用HPLC法测定坤复康胶囊中苦参碱的含量,选用ODS色谱柱,以甲醇-三乙胺水溶液（0．05％）（55：45）为流动相,检测波长为210nm．测定结果是：苦参碱在50μg·mL^-1～1000μg·mL^-1（r=0．9997）范围内线性关系良好,平均回收率达到96．23％,RSD为2．59％（n=6）．本方法准确可靠,灵敏,操作简便,可用于坤复康胶囊的质量控制． 相似文献
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目的：测定苦瓜酒中皂苷的含量。方法：以人参皂苷和β-谷甾醇为对照品,香草醛一高氯酸分光度法测定皂苷含量。结果：人参皂苷在0．030-0．240mg范围内线性关系良好（r=0．9991）,平均加样回收率为99．6％,RSD=2．5％（n=6）,样品含量在0．1511-0．5630rag;β-谷甾醇在0．015-0．116mg范围内线性关系良好（r=0．9993）,平均加样回收率为100．9％,RSD=2．6％（n=6）,样品含量在0．0656-0．2479mg。结论：β-谷甾醇和人参皂苷均可作为测定苦瓜皂苷含量的对照品,方法准确可靠,可用于苦瓜酒的质量控制。 相似文献
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HPLC法测定骨愈灵片中人参皂苷Rg1和三七皂苷R1的含量 总被引：2，自引：0，他引：2
张冕 《荆门职业技术学院学报》2009,24(2):43-46
目的：建立骨愈灵片中人参皂苷Rg1和三七皂苷R1的含量测定方法。方法：采用高效液相色谱法,乙腈-水（18：82）为流动相;流速1．0mL·min^-1;检测波长203131／1。结果：人参皂苷Rg1的回归方程为Y=2．829X＋4．167（r=0．9999,n=5）,线性范围为3．0～22．5ug;三七皂苷R1的回归方程为Y=7．580X-3．971（r=0．9996,n=5）,线性范围为1．0～7．5ug。平均回收率分别为98．95％、99．27％。结论：本方法准确、灵敏,可用于骨愈灵片的质量控制。 相似文献
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董艳辉 《通化师范学院学报》2008,29(2):46-47
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
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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
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《实验室研究与探索》2016,(11):35-38
通过对比甘草单煎以及与桔梗共煎后抗炎成分含量的变化探究甘草桔梗的配伍机理。采用高效液相色谱法对甘草提取液以及甘草-桔梗提取液中的抗炎成分主要是甘草酸以及甘草次酸进行定量分析;甘草酸在0.02~2 mg/m L浓度内保持较好的线性关系;甘草次酸在0.02~1 mg/m L浓度内保持较好的线性关系。重复性实验甘草酸RSD为1.30%(n=4),甘草次酸RSD为1.41%(n=4);精密度实验甘草酸RSD为2.00%(n=5),甘草次酸RSD为1.73%(n=5);稳定性实验甘草酸RSD为1.32%(n=4),甘草次酸RSD为0.85%(n=4),供试液中的甘草酸以及甘草次酸能够在9 h内保持稳定;回收率实验中甘草酸回收率等于96.96%(n=3),甘草次酸回收率等于106.41%(n=3)。相比于甘草单煎,加入桔梗后,同数量的甘草通过煎煮,增加了抗炎物质的含量,从而提升了该方剂的疗效。 相似文献
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宋九华 《乐山师范学院学报》2011,26(5):13-14
目的：是建立九味羌活丸中甘草酸和异甘草素的含量测定方法。方法：色谱柱：日本岛津公司Shim—pack VP-ODS（150mm×4.6mm,5.0μm）。流动相：甲醇—0.5%冰醋酸（65：35）;流速1ml/min;检测波长0-10min为370nm,10-40min为250nm。结果：甘草酸在0.1959～3.9180μg范围内与峰面积呈良好的线形关系r,=1.0000,平均回收率99.12%,RSD为0.62%。异甘草素在0.0124～0.2480μg范围内与峰面积呈良好的线形关系r,=1.0000,平均回收率99.17%,RSD为0.67%。结论：所建立的方法简便可行、重现性好、可作为九味羌活丸的质量控制。 相似文献
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《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
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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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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
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献