首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到19条相似文献,搜索用时 156 毫秒
1.
天麻特异DNA序列的克隆及其在天麻鉴定中的应用   总被引:1,自引:0,他引:1  
应用改进的RAPD方法测定了名贵中药材天麻基因组DNA指纹图谱;通过选择和回收各种天麻种群共有和优良种群特有的DNA片段,加以克隆、测序和生物信息学分析,证明其中5个DNA序列是未报道的,已被美国基因数据库收录,并运用高效液相色谱技术测定了天麻样本的有效成分天麻素含量。运用PCR技术研究了这些DNA序列在9个天麻种群中的分布及其与天麻素含量的关系。结果表明这5个DNA序列在这些天麻种群中的分布各不相同,其中DNA序列1是所研究的全部天麻种群共有、而其伪品没有的特异DNA分子标记;DNA序列2可能与天麻的天麻素含量高有关。这些DNA标记序列可用于天麻的真伪鉴别、品种鉴定和优选优育等。  相似文献   

2.
鳖甲消痔胶囊中中药化学成分的测定   总被引:2,自引:0,他引:2  
采用薄层色谱法(thin-layer chromatography,TLC)对药方中的土大黄、地榆、槐角和栀子进行定性鉴别,并用高效液相色谱法(high performance liquid chromatography,HPLC)测定胶囊中盐酸小檗碱的含量。结果表明,TLC法可用于土大黄、地榆、槐角和栀子的定性鉴别;盐酸小檗碱对照品在0.1~1.0μg范围内呈线性关系,r=0.999 4;加样回收率为97.80%,RSD为1.40%。本方法结果准确,灵敏度高,重复性好,能够有效地控制鳖甲消痔胶囊的质量。  相似文献   

3.
目的:建立肾衰康复胶囊定性鉴别和含量测定方法,为今后质量控制工作提供理论依据。方法:经薄层色谱法对肾衰康复胶囊中苍术和木香进行定性鉴别,采取高效液相色谱法对苍术中苍术素含量进行测定。结果:苍术素浓度80.28-803.19ug之间,浓度与峰面积积分值呈良好线性关系,r=0.9998,平均回收率99.60%,RSD值为0.49%。结论:试验中建立的定性与定量方法具有操作简单、结果准确可靠等优势,可作为肾衰康复胶囊质量控制方法。  相似文献   

4.
林子安  昌水平  刘庭恩 《蛇志》2014,(2):153-155
目的研究拔毒消炎软膏的质量控制方法。方法用薄层色谱法(HPLC)对制剂中大黄、黄柏进行定性鉴别,高效液相色谱法测定大黄酚的含量。结果定性鉴别薄层色谱斑点特征明显;高效液相色谱法测定含量,大黄酚在0.061~0.304μg/ml范围内呈良好的线性关系(r=0.9954),平均加样回收率为98.68%,RSD=1.39%。结论采用薄层色谱法定性、高效液相色谱法定量,简便准确、重现性良好,可有效控制该制剂质量。  相似文献   

5.
目的:探讨天麻熄风胶囊的DNA条形码鉴定方法与价值。方法:2015年1月到11月,选择3批天麻熄风胶囊(批号20150918、200150919、20151019)进行显微鉴定与DNA条形码鉴定,选择的基因序列为天麻素线粒体A基因,进行基因测序与遗传分析。结果:显微鉴定显示天麻细胞无色,呈现长卵形、长椭圆形或类圆形,遇碘液显棕色;蔓荆子非腺毛2-3个细胞,顶端细胞基部稍粗;甘草纤维成束、壁厚,周围薄壁细胞可形成晶纤维;半夏椭圆形细胞存在于粘液细胞中。3批天麻熄风胶囊的天麻素线粒体A基因特定序列中,A含量为27.9%、C为24.9%、G为18.3%、T为28.9%,G-T含量明显高于G/C含量(43.2%)(P0.05)。遗传分析显示20150918批次的种间最小K-2P距离为0.006,种间最大K-2P距离为0.241;20150919批次种间最小K-2P距离为0.008,最大K-2P距离为0.074;20151019批次的种间最小K-2P距离为0.008,种间最大K-2P距离为0.133。结论:天麻熄风胶囊成分复杂,显微鉴定技术存在一定的缺陷,DNA条形码鉴定能有效反映胶囊成分,且能很好判定药物批次的种内与种间变异,具有很好的鉴别价值。  相似文献   

6.
首次采用高效液相色谱法对中药复方止咳清肺胶囊中的有效成分—芥子碱硫氰酸盐进行了含量测定研究,由此建立了该复方的HPLC法质量分析方法。  相似文献   

7.
中药连翘具有抗菌、消炎、解热等作用,本研究目的在于摸索连翘有效成分提取的试验方法,获得适于抑制奶牛乳房炎致病菌的有效成分。以连翘叶片为材料,利用回流法提取工艺提取,采用薄层色谱(TLC)测定法定性分析,高效液相色谱法(HPLC)测定有效成分纯度,抑菌圈检测法检测抑菌效果。结果表明,连翘提取物对奶牛乳房炎致病菌具有抑制效果。  相似文献   

8.
目的:天麻具有许多药理作用和重要开发价值,通过探索天麻的未知化学成分和鉴定西藏天麻种群的品质,为深入研究、开发和利用西藏优良天麻种群提供科学技术支持。方法:本研究采用HLPC-MS(液质联用)技术测定西藏天麻的化学成分;采用高效液相色谱技术测定西藏6个天麻种群的生化指纹图谱,利用天麻素峰面积、数学公式和SPSS软件,计算和比较西藏6个天麻种群的平均天麻素含量和各种化学成分分离峰的总面。结果:从天麻块茎中发现了33个未报道的化学物质;西藏天麻的生化指纹图谱具有7个较大的共有特征分离峰,分别位于1.854、2.759、7.279、7.591、8.500、9.557、10.753min;根据生化指纹图谱特征可将它们分为三个主要类型;凡是带有一型生化指纹图谱的天麻个体和种群往往含有更高的天麻素和更大的分离峰总面积,品质更优良。结论:西藏天麻种群3和种群6以一型生化指纹图谱为主,其天麻素含量最高,分离峰总面积最大,品质最优良,具有重要研究、开发和保护价值。本研究成果对于天麻的化学成分分析与鉴定、天麻种群和品质鉴定与评价以及西藏天麻的品种选优、资源保护与利用具有重要指导意义和科学价值。  相似文献   

9.
天麻及其近缘植物酚性成分的高效液相色谱定量分析   总被引:2,自引:1,他引:2  
本文应用高效液相色谱技术对天麻(Gastrodia elata Blume)及其近缘植物共16个样品的8种酚性成分进行定性定量分析。实验结果表明,该方法不仅可用于检验中药天麻的质量、亦可用于筛选新的天麻素药物资源,并为其化学分类提供一定的依据。  相似文献   

10.
天麻中天麻素含量的影响因子研究   总被引:3,自引:0,他引:3  
应用高压液相色谱技术,对产地、品种、以及炮制方法等因素对天麻中天麻素含量的影响进行了比较分析.结果表明,炮制对天麻药材中天麻素的含量影响最大.对不同炮制方法的比较分析结果显示,蒸制法可显著提高天麻素的含量.本文还讨论了天麻素在炮制过程中形成的可能机理.  相似文献   

11.
周鹤峰  邵敏  葛正龙 《广西植物》2005,25(4):353-355,i0002
采用浸苗法将野生天麻总DNA导入马铃薯试管苗,对筛选得到的转化植株进行蛋白及药用成份的分析。结果显示:(1)在200株转化的马铃薯中有21株的紫外扫描图谱与正常对照组有显著差异,且在220nm有明显吸收峰。(2)5株经PCR扩增出野生天麻抗真菌蛋白(GAFP)基因。(3)转基因马铃薯与正常马铃薯的蛋白表达有明显差异,并且在转基因马铃薯中有一条与野生天麻抗真菌蛋白(GAFP)相同的条带。而正常马铃薯中无此条带。(4)通过薄层层析法检测出3株转基因马铃薯表达野生天麻的有效药用成份天麻素。说明采用浸苗法进行外源总DNA导入是可行的。  相似文献   

12.
为选择一种准确快捷的方法测定银耳多糖的单糖组成,对薄层色谱法(TLC)、气相色谱法(GC)、高效液相色谱法(HPLC)三种色谱方法进行比较。结果表明,前两种方法的测定结果均不理想,而HPLC法,操作简便,灵敏度高,分离效果好,信息完整。测定结果为由葡萄糖、甘露糖、葡萄糖醛酸、木糖、岩藻糖组成,其摩尔比为0.24∶1.00∶0.06∶0.29∶0.25。HPLC法对酸性杂多糖组成糖分析是一种比较理想的选择。  相似文献   

13.
通过薄层色谱(TLC)与高效液相色谱(HPLC)联用技术鉴定了暗纹东方鲀(Takifugu obscurus)肌肉中存在肌肽和谷胱甘肽,同时利用高效液相色谱法测定了肌肽和谷胱甘肽(GSH)的含量。薄层层析采用的展开剂为正丁醇:乙酸:水(4∶2∶1),层析板为硅胶板。高效液相色谱利用Kromasil C18反相柱分析,流动相为10%的纯乙腈和90%含有0.05%三氟乙酸的超纯水。结果表明:通过薄层色谱和高效液相色谱鉴定了暗纹东方鲀肌肉中肌肽和谷胱甘肽,其中暗纹东方鲀肌肉中肌肽含量约213μg/g(鲜重),还原性谷胱甘肽含量约211μg/g(鲜重)。本法样品无需衍生,操作简便,适合于暗纹东方鲀肌肉中肌肽和谷胱甘肽的测定。本文为生物体内肌肽和谷胱甘肽的研究提供借鉴意义。  相似文献   

14.
F2-Isoprostanes in plasma and urine are generally determined by labor-intensive methods requiring sample purification by solid-phase extraction and thin-layer chromatography (TLC). A streamlined and more sensitive method for the measurement of esterified plasma F2-isoprostanes was developed by replacing these steps with high-performance liquid chromatography (HPLC) using an amino column with a hexane/2-propanol gradient. Pentafluorobenzyl esters of F2-isoprostanes were prepared and purified by HPLC, silylated, and then analyzed by gas chromatography (GC) with negative chemical ionization mass spectroscopy (NCI-MS). This method permits analysis with lower plasma volumes (100 microL) and greater sensitivity (to 10 pg; allowing detection to 50 pg/mL) than provided by other methods. Urinary F2-isoprostanes can also be efficiently quantified by this method, with 8-iso-PGF2alpha being identified as a major isomer. With this procedure, esterified plasma F2-isoprostanes were found to be 8.3-fold higher in an end-stage renal failure patient on hemodialysis and urinary 8-iso-PGF2alpha was 7.1-fold higher in a cigarette smoker than respective control subjects. This method, particularly the substitution of the TLC step common to other methods with HPLC, results in a more sensitive and reproducible assay.  相似文献   

15.
One hundred and fifty-seven strains belonging to Aspergillus section Nigri were tested for ochratoxin A production using three different methods: a relatively new immunochemical method based on an enzyme-linked immunosorbent assay (ELISA), thin-layer chromatography (TLC) and high-performance liquid chromatography (HPLC). The monoclonal antibody-based ELISA technique was successfully used to screen for low levels of ochratoxin A in the black Aspergilli without concentrating the culture filtrates. The results were confirmed by TLC and HPLC analysis and chemical derivatization. These latter methods required concentrated filtrates. Ochratoxin A was detected in the culture filtrates of five of the 12 A. carbonarius strains, none of the 45 A.japonicus strains and three of the 100 isolates in the A. niger aggregate (A. foetidus, A. awamori and A. niger).Abbreviations ELISA enzyme-linked immunosorbent assay - HPLC high-performance liquid chromatography - OA ochratoxin A - TLC thin-layer chromatography  相似文献   

16.
A simple and rapid method for the analysis of lipids on a thin layer chromatography (TLC) plate by matrix-assisted secondary ion mass spectrometry (SI-MS) is reported. Analysis was performed without elution of the sample from the TLC plate. Mass spectra obtained by this method are free from interference due to the TLC plate absorbent and reagents used for the detection of the spots. About 1 micrograms of lipids applied on a TLC plate can be analyzed by this method. On scanning the plate, mass chromatograms of each lipid were obtained based on its migration distance along the plate.  相似文献   

17.
Using 7,7,8,8-tetracyanoquinodimethane (TCNQ) as a new derivatization reagent for HPLC and TLC, novel methods are described to detect secondary amine-bearing antidepressants (paroxetine, desipramine, fluoxetine, nortriptyline, maprotiline). The HPLC method is sensitive enough to detect these drugs in plasma at therapeutic levels whereas the latter has potential to detect them in overdose or forensic cases. The methods are based on purple chromogens formed by the displacement reaction of the drugs with TCNQ. The resulting chromogens are directly separated by either reversed-phase HPLC on a C(18) column or TLC on silicagel plates. For HPLC, acetonitrile-water (60:40) was used as mobile phase, with detection at 567 nm and separation in 40 min. For TLC, three developing solvent systems were used. By HPLC, 36 ng ml(-1) spiked plasma concentration of the drugs gave easily detectable signals whereas by TLC, detection limits varied mostly between 240 and 480 ng ml(-1). The HPLC method was applied to real plasma samples. The methods described are simple and very selective; some metabolites of these antidepressants and a vast number of drugs do not interfere with detection.  相似文献   

18.
Oligosaccharides were analyzed by a combination of high-performance liquid chromatography (HPLC) and mass spectrometry (MS). First, oligosaccharides labeled with 2-aminopyridine were studied to see if they could be analyzed by MS under the conditions used for separation by HPLC. Pyridylamino (PA)-oligosaccharides could be analyzed under these conditions, although the mass spectra were affected. Then, liquid chromatography-mass spectrometry was used to analyze a PA-oligosaccharide mixture derived from human immunoglobulin G. The PA-oligosaccharides were separated on a reversed-phase column and mass-analyzed directly. The observed molecular weights were close to or identical to those expected from the structures, which were estimated from the elution position on HPLC. This method is rapid and simple, as the mass spectrometer can give the accurate molecular weight of each PA-oligosaccharide in one chromatography run, even if the HPLC separation is incomplete. This method can be used to extend the so-called two-dimensional mapping of PA-oligosaccharides. The structure can be studied in greater detail by tandem MS.  相似文献   

19.
Nicol  R. W. 《Mycopathologia》1998,142(2):107-113
Thin layer chromatography (TLC) methods for identifying and quantifying deoxynivalenol (DON), fumonisin B1 (FB1) and zearalenone in grain samples were compared to immunoassay (ELISA) and high performance liquid chromatography (HPLC) methods to determine the reliability of the less expensive TLC. There was a very good agreement between levels of DON measured by TLC and competitive-direct ELISA, and between levels of fumonisin B1 measured by TLC and HPLC, over a wide range of concentrations. Correlation coefficients (Pearson's) were 0.978, 0.914 and 0.953 for DON in maize, DON in wheat and FB1 in maize respectively. A lower correlation coefficient (r = 0.672) was obtained when zearalenone was quantified by TLC and HPLC. Possible reasons for this are discussed. A cost comparison of the various methods revealed that TLC was the least expensive for sample analysis. It is recommended that researchers choose which analytical method to use based upon individual considerations of cost and precision. This revised version was published online in June 2006 with corrections to the Cover Date.  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