共查询到20条相似文献,搜索用时 93 毫秒
1.
牙本质中天冬氨酸消旋化程度的测定——手性毛细管气相色谱法与高效液相色谱法的比较 总被引:1,自引:0,他引:1
应用手性毛细管气相色谱法(酸性异丙醇、三氟乙酸酐为衍生试剂)、高效液相色谱法(邻苯二甲醛-N-乙酰-L-半胱氨酸为手性衍生试剂)同时测定人类第一磨牙牙本质中天冬氨酸的消旋化程度,结果表明,两者均可有效地用于天冬氨酸对映体的分离测定,但气相色谱检测限(0.2pmol)低于高效液相色谱(1.0pmol),而变异系数(7%)、总分析时间(100min)均高于高效液相色谱(分别对应为4%,31min)。 相似文献
2.
3.
高效液相色谱法快速,灵敏测定尿中3—甲基组氨酸含量 总被引:2,自引:0,他引:2
本文报道用柱前衍生高液相色谱法快速,灵敏地测定尿中3-甲基组氨酸(3MH)。采用含30%乙腈的10mmol/L磷酸钠缓冲液(pH=7.5)为流动相,等梯度洗脱,10min内即可分析一个样品;在20-3000pmol范围内,3MH线性相关系数为0.9986,相对标准偏差为2.3%(批内)和4.5%(批间);并测定了10名正常人尿中的3MH含量。 相似文献
4.
5.
本文研究了水溶性试剂1-(2-吡啶偶氮)-2-萘酚-6-磺酸(PAN-S)与铁(Ⅱ)、钴(Ⅱ)和镍(Ⅱ)之螯合物的衍生和液相色谱分离条件。在Nova-PakTMC18柱上,用含10mmol/L的pH5.0的醋酸-醋酸钠缓冲溶液的甲醇-水溶液(50:50,V/V)作流动相,溴化四丁基铵(TBA·Br)作离子对试剂,流动相流速为1.0mL/min,在550nm波长处进行光度检测。在Ⅱmin内用高效液相色谱分离测定了Fe(Ⅱ)、Co(Ⅱ)和Ni(Ⅱ)与PAN—S的螯合物,提出了离子对反相高效液相色谱快速分离测定痕量铁、钴、镍的新方法。信噪比(SNR)为2时,检测下限分别为0.043、0.007和0.012mg/L。 相似文献
6.
7.
8.
用二甲酚橙作柱前衍生试剂,在C18色谱柱上,以乙腈-水(12:88,V/V)作流动相,六次甲基四胺为对离子试剂,反相离子对高效液相色谱-光度法快速分离测定痕量Ni^2+,Zn^2+,Cu^2+配合物和试剂在8min内出峰完毕,575nm处检测,检出限分别为(ng/mL):Ni^2+0.83,Zn^2+0.01,Cu^2+,1.30,用于植物样品中Ni^2+,Zn^2+,Cu^2+的测定,结果令人满 相似文献
9.
用N-羟基琥珀酰亚胺-间二甲氨基苯甲酸酯为柱前衍生试剂,C18柱,含pH为4.0为10mmol/L柠檬酸-磷本氢二钠缓冲溶液的40%的甲醇-水(V/V)溶液为流动相,反相高效液相色谱(RP-HPLC)分离荧光检测了氨、甲胺和乙胺,检出限分别为5.0、0.5和1.0pmol,方法简便、快速。 相似文献
10.
用反相高效液相色谱法分析测定Cd,Hg,Pb和Cu 总被引:5,自引:0,他引:5
用直接进样(C18柱)反相高效液相色谱法研究了Men+-Dz(二硫腙)体系的色谱行为,建立了同时测定Cd,Hg,Pb和Cu的分析方法。方法的线性范围为0.01~2.0mg/L,最低检出质量浓度为2.4~5.0μg/L,相对标准偏差为1.8%~9.7%,回收率为94%~103%(Hg除外)。直接进样反相高效液相色谱法比萃取进样正相液相色谱法更快速,更简便,更容易操作,已用于人发测定。 相似文献
11.
12.
13.
ShiLanFENG FangDiHU JianXiongZHAO JingWenXU LiRenCHEN 《中国化学快报》2004,15(11):1335-1338
Chromatography fingerprint (CFP) of 10 samples of hongqi were studied. 23 commonpeaks were analyzed, their average similarity was 97.29%. CFP were positioned with main indexcomposition such as formononetin, calycosin and then the contents of index composition weredetermined. The character and exclusive of CFP of 10 samples of hongqi were clear. CFP andcontent determination of index composition of hongqi could be used to evaluate the quality of hongqicomprehensively. 相似文献
14.
Walter Heitz 《Angewandte Chemie (International ed. in English)》1970,9(9):689-702
Gel chromatography can be regarded as a network-limited partitioning of substances. The theory of this method and the preparation and properties of various gel systems are reviewed. Optimization of the method is illustrated for the separation of oligomers. 相似文献
15.
16.
K. I. Sakodynskii S. A. Volkov K. F. Khalilov V. I. Reznikov V. Yu. Zel'venskii 《Chromatographia》1985,20(9):538-542
Summary Chromatography is carried out under the conditions of fluidization, in long, straight tubes under organized and non-organized
conditions. Under non-organized conditions the column is filled only with a sorbent. In organized conditions, either metal
coils are added into the column or a segmented column is utilized with metal grids. The results obtained are compared to those
obtained under fixed-bed conditions when the column is completely filled with the sorbent. Organized fluidized beds provide
a significant decrease in longitudinal bandspreading. 相似文献
17.
18.
19.
The separation of enantiomers is of great importance in biology, pharmaceutics, agriculture and environment. The different separation modes ( i. e. capillary zone electrophoresis ( CZE ), micellar electrokinetic chromatography ( MEKC ), capillary electrochromatography ( CEC ), etc ) 相似文献