共查询到20条相似文献，搜索用时 62 毫秒
1.
目的:测定蛇胆川贝液中苦杏仁甙的含量。方法:用甲醇提取苦杏仁甙,高效液相色谱法(HPLC)分离,紫外可变波长检测器检测。结果:蛇胆川贝液中苦杏仁甙的含量为14.10％(mg/ml),即1.41mg/瓶。结论:本文所用方法稳定性高,重现性好,操作简单,耗时较短,是生产蛇胆川贝液较理想的质量监控方法。 相似文献
2.
黄毛耳草中乌索酸的分离制备及定量分析 总被引：2，自引：0，他引：2
目的:采用“醇提凝析法”分离制备黄毛耳草中的乌索酸,建立其含量的测定方法 方法:IR、MS、1HNMR、13CNMR鉴定乌索酸结构,反相高效液相色谱法测定其含量,色谱柱为SymmetryShieldRP1 8柱(3 . 9×1 5 0mm ,5 μm) ;流动相为甲醇∶水(88∶1 2 ,V/V) ;流速为1 0mL/min ;二极管阵列检测器检测,检测波长2 1 0nm ;柱温2 5℃;结果:确证化合物为乌索酸 HPLC法线性范围:4 . 5～2 2 . 5 μg ;线性回归系数大于0 . 9998 乌索酸纯度为99 . 82 %,得率3 . 6 5‰ 结论:制备方法实用可行,乌索酸纯度高,安全性好 HPLC法快速简便、精密度高、重现性好、线性范围宽,可用于控制乌索酸产品质量 相似文献
3.
目的:建立高效液相色谱法(HPLC)测定清热丸中黄芩苷的含量.方法:采用反相高效液相色谱法,色谱柱为十八烷基硅烷键合硅胶(4.6 mm×250 mm,5μm);流动相:甲醇-水-磷酸(50:50:0.2);检测波长:280 nm;流速为1.0 ml/min;柱温为40℃.结果:黄芩苷线性范围为0.4-2.0μg,r=0.9998,平均回收率=98.90%,黄芩苷RSD=1.3%(n=6).结论:方法简便、准确、重现性好,可作为该制剂的含量测定方法. 相似文献
4.
目的 :建立HPLC法同时测定女宝中吴茱萸碱和吴茱萸次碱的方法。方法 :用甲醇提取女宝中吴茱萸碱和吴茱萸次碱 ,HPLC分析 ,紫外检测器检测。色谱柱 :YWG -C18(10 μm ,2 5 0mm× 4 .6mm)。流动相 :水 -甲醇 -乙腈梯度析脱。流速 :1.0ml/min。柱温 :30℃。检测波长 :2 2 5nm。结果 :吴茱萸碱的回归方程为Y =14 7.37X + 1186 .32 ,相关系数为0 .9999,线性范围为 5～ 10 0 0 μg/mL ,回收率为 99.83% ;吴茱萸次碱的回归方程为Y =10 1.19X + 2 79.81,相关系数为 0 .9999,线性范围为 4 .5～ 90 0 μg/mL ,回收率为 98.72 %。本文所用女宝胶囊中吴茱萸碱和吴茱萸次碱的含量分别为 0 .0 82 % (0 .10 3mg/粒 )和 0 .0 5 5 % (0 .0 6 9mg/粒 )。结论 :本文方法稳定性高 ,重现性好 ,操作简单。是生产女宝胶囊质量监控较理想的方法。 相似文献
5.
《绵阳师范学院学报》2018,(11):69-72
采用高效液相色谱法测定喜树7个不同部位中喜树碱的含量.色谱柱为Diamonsil TM C18(4. 6×150mm,5μm);流动相为V(甲醇)∶V(水)(=55∶45);检测波长254 nm;柱温35℃;流速0. 8 m L·min-1.结果表明,种籽中喜树碱含量最高,嫩叶、嫩枝其次,喜树碱在0. 130. 24μg/m L范围内线性关系良好,平均回收率为99. 6%,RSD为1. 7%.本方法具有简单高效,灵敏度高,选择性强等优势,可用于测定喜树中喜树碱的含量. 相似文献
6.
高效液相色谱法测定尼群地平 总被引：2，自引：0，他引：2
采用高效液相色谱法 ,以HypersilC1 8( 4 .6mmi.d .× 2 5 0mm ;5 μm)为色谱柱 ,甲醇 水 (体积比为 70 :30 )为流动相 ,检测波长炒 2 37nm ,研究尼群地平性质。在质量浓度 1 2mg/L～ 1 2 0mg/L时质量浓度与峰面积线性良好 (r =0 .9996 ) ,日内差、日间差RSD为 0 8%和 1 2 % (n=5 )。方法简便、准确。 相似文献
7.
采用高效液相色谱法对生普洱与熟普洱茶中咖啡因的含量进行测定.色谱柱为Kromasil C18;流动相:水-甲醇-乙酸-二甲基酰胺(70:30:0.05:0.25,V/V);色谱柱温:25℃;进样量:5μL;检测器:紫外检测器;扫描波长:210~400 nm;检测波长:274 nm.方法变异系数小于3.96%,回收率为90.62%~103.8%.生普洱茶和熟普洱茶咖啡因含量分别为19.92 mg/g和28.58 mg/g. 相似文献
8.
红车轴草提取物中异黄酮含量的高效液相色谱分析法的研究 总被引：4，自引：0，他引：4
边清泉 《绵阳师范学院学报》2003,22(2):52-55
建立了一种红车轴草提取物中异黄酮含量的高效液相色谱分析方法。采用日本岛津公司LC - 6AHPLC系统 ,Shim -packVP -DOS柱 (1 5 0mm× 4 6mmID ,5 μm) ,流动相MeOH -CH3 CN -H2 O(体积比 3 7∶1 3∶5 ) ,流速0 9mL·min-1 ,检测波长 2 6 0nm ,柱温 30℃ ,进样量 1 0 μL ;样品制备方法以 1 0mol L-1 HCI甲醇溶液在 85℃条件下水解 1 6h ,HPLC法测定异黄酮的含量 ;该法的RSD为 1 31 % (n =5 ) ,平均回收率为 96 5 %。 相似文献
9.
高效液相色谱法测定腺苷 总被引：1，自引：0，他引：1
采用高效液相色谱法测定腺苷的纯度和含量。色谱柱为ODSC18(2 5 0mm× 4 6mm ,5 μm) ,流动相 (体积比 )为 10mmol/L磷酸二氢钾∶甲醇 =85∶15 ,流速为 0 9mL/min ;温度35℃ ,在 2 5 4nm波长下检测。腺苷的检测限为 0 0 2ng ,在 1～ 10 0ng/ μL范围内有良好的线性关系 (R =0 9996 3) ,方法的回收率为 99 0 %～ 10 1% (RSD <1 0 % ) ,日内精密度为 0 88% ,日间精密度为 1 0 8%。 相似文献
10.
罗明芳 《黄冈职业技术学院学报》2007,9(3):89-90
目的:采用高效液相法测定众生片中黄芩苷的含量。方法:色谱柱为HypersilC18(4.6mm×200mm,5μm;流动相为甲醇-水-磷酸(45:55:0.2);流速为:1ml.min-1;检测波长为278nm.。结果:黄芩苷进样量在0.0150.15ug之间,与峰面积呈良好的线性关系(r=0.9999),平均加样回收率为96.57%,RSD=1.3%(n=5)。结论:本方法操作简单,快捷,可用于测定众生片中黄芩苷的含量。 相似文献
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
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. 相似文献
12.
Richard Denner 《海外英语》2007,(4):14-15
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. 相似文献
13.
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. 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
17.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 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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《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