共查询到20条相似文献，搜索用时 46 毫秒
1.
目的:建立筋骨痛巴布膏的质量标准。方法：筛选方中独活、大黄、苏木及冰片进行薄层色谱鉴别；HPLC法对成品中大黄素进行含量测定。结果：制定了巴布膏中独活等药材的薄层鉴别方法；以大黄素为指标，以Kromasil C18色谱柱（250 mm×4.6 mm，5 μm）为固定相，甲醇-0.1%磷酸溶液（85∶15）为流动相；检测波长254 nm条件下，成品中大黄素能有效分离，方法学结果可行。结论:该法方便准确、灵敏度高、重现性好，能够为筋骨痛巴布膏质量标准的制订提供客观精准的依据。 相似文献
2.
目的：提升天麻头风灵胶囊质量标准，有效控制其制剂质量。方法：采用薄层色谱法，以紫丁香苷和哈巴俄苷为对照，定性鉴别槲寄生和玄参；采用HPLC法对阿魏酸进行含量测定，C18柱（Inertsil ODS-2；4.6mm×250mm，5μm）；流动相：乙腈-0.05%磷酸溶液（16∶84）；检测波长：321nm；流速：1ml/min；柱温：30℃。结果：薄层色谱定性鉴别方法灵敏，专属性强；阿魏酸在9.97～997ng范围内线性良好，r=0.9999；加样回收率为97.52%。结论：本方法简便、重复性好，为天麻头风灵胶囊质量标准提升奠定了基础。 相似文献
3.
目的：建立高效液相色谱（HPLC）法同时测定湘产枳壳中芸香柚皮苷、柚皮苷、橙皮苷、新橙皮苷和橙皮内酯的含量。方法：采用Venusil XBP C18（4.6mm×250mm，5μm）色谱柱，以乙腈-0.1%磷酸水为流动相（80〖DK〗∶20），流速1.0ml/min，柱温35℃，变波长检测。结果：芸香柚皮苷、柚皮苷、橙皮苷、新橙皮苷、橙皮内酯分别在100～2000ng、420～8400ng、32.12～642.4ng、260～5200ng、42.75～855ng内呈良好线性关系，平均回收率分别为98.7%、101.0%、100.7%、100.6%、98.6%，且精密度、重复性、稳定性良好；各批次样品中芸香柚皮苷、柚皮苷、橙皮苷、新橙皮苷、橙皮内酯的含量范围分别为0.48%～0.84%、4.44%～8.50%、0.19%～0.95%、3.03%～10.19%、0.16%～0.30%；聚类分析分为3类，即11号样品为一类，2号与10号样品为一类，其余样品为一类；橙皮苷含量在各批次样本中波动较大。结论：本研究建立了湘产枳壳中5种成分的HPLC含量测定方法，该方法简便，准确度高，可为湘产枳壳质量控制提供科学依据。 相似文献
4.
目的：建立测定宁志胶囊中芒果苷含量的HPLC法。方法：采用高效液相色谱法，色谱柱为Agilent 5TC-C18（250 mm×4.6 mm，5 μm），以乙腈-0.2%冰醋酸溶液（13∶87）为流动相，检测波长为258 nm，流速为1.0 ml/min，柱温为30 ℃。结果：芒果苷在4.0951～51.1885 μg/ml之间呈良好线性关系（r=0.99987）。芒果苷平均加样回收率为104.92%（n=6），RSD=1.20%。结论：经方法学验证，本法可用于宁志胶囊的质量控制。 相似文献
5.
目的：建立三金排石颗粒的质量标准。方法：采用薄层色谱法（TLC）分别对三金排石颗粒中的海金沙、栀子、大黄和山楂共四味中药进行定性研究;采用高效液相色谱法（HPLC）分别对金钱草中的槲皮素和山柰素进行定量研究,色谱柱为C18柱,流动相为甲醇-0.35%磷酸溶液（50∶50）,流速为1.0 ml/min,检测波长为360 nm,柱温为30℃,进样量为10 μl。结果：所建立的TLC法中,海金沙、栀子、大黄和山楂斑点清晰,分离度好,专属性强。槲皮素和山柰素的检测质量浓度线性范围分别在0.010～0.100 mg/ml、0.010～0.101 mg/ml之间（r=0.9993、0.9998,n=6）,精密度、稳定性、重复性试验的RSD均≤2%（n=6）,平均加样回收率分别为101.86%、101.48%（n=6）。结论：本研究所建立的三金排石颗粒的质量标准,TLC法及HPLC法操作简便,准确快速,重现性好,可有效控制三金排石颗粒的质量。 相似文献
6.
目的：建立中药舒心片中丹酚酸B含量的测定方法。方法：采用高效液相色谱法（HPLC）测定舒心片中丹酚酸B的含量,色谱柱为Agilent TC-C18（2）色谱柱（4.6 mm×250 mm,5 μm）,以乙腈-0.1%的磷酸溶液（25∶75）为流动相;检测波长为286 nm;柱温为25℃;流速为1.0 ml/min。结果：供试品和对照品溶液中丹酚酸B与他峰分离度良好;在0.050～1.642 μg之间丹酚酸B呈良好线性关系,R=0.9993,丹酚酸B平均加样回收率为97.58%,RSD=0.25%。结论：经方法学验证,本法可用于舒心片的质量控制。 相似文献
7.
目的：建立护心康片多波长HPLC指纹图谱，并研究复方与组方药物指纹图谱峰的相关性。方法：采用C18色谱柱（4.6mm×200mm，5μm）；柱温35℃；0.1%磷酸溶液（A）-乙腈（B）为流动相梯度洗脱；流速1.0ml/min；检测波长分别为203nm（检测三七和黄芪）、270nm（检测丹参酮类）、286nm（检测丹参酚酸类和黄芪）。结果：建立了23个特征峰的护心康片HPLC指纹图谱，并对其特征峰进行了组方药物归属分析。结论：该方法能揭示复方主要色谱峰在组方药物中的归属，有效控制护心康片的质量。 相似文献
8.
目的：建立高效液相色谱（HPLC）法测定疏肝健脾解毒方中毛蕊异黄酮葡萄糖苷的含量。方法：采用HPLC法,以依利特Supersil ODS-C18柱（4.6 mm×250 mm,5 μm）为色谱柱,以乙腈-0.2%甲酸溶液为流动相梯度洗脱（0～23 min,12%乙腈;23～65 min,12%～26%乙腈）,流速为1.0 ml/min,柱温为30℃,检测波长为260 nm。结果：经方法学验证,毛蕊异黄酮葡萄糖苷在7.2～43.2 μg（R2=0.9998）范围内线性关系良好,精密度、稳定性和重复性试验的RSD 均＜2.0%（n=6）,加样回收率为98.87%（RSD为1.79%）。结论：本研究建立的含量测定方法简便,结果准确可靠,适用于疏肝健脾解毒方中毛蕊异黄酮葡萄糖苷的测定,可为其质量标准的深入研究提供依据。 相似文献
9.
目的：建立滋阴温阳活血颗粒中两种指标性成分（腺苷和山奈酚-3-O-β-D-葡萄糖苷）的同时测定方法。方法：采用HPLC法，选用phenomex Kinetex C18色谱柱（4.6mm×250mm，5μm），0.1%磷酸-乙腈为流动相，梯度洗脱，流速1.0ml/min，柱温30℃，进样量10μm，检测波长254nm；以腺苷和山奈酚-3-O-β-D-葡萄糖苷为指标性成分，共测定10批滋阴温阳活血颗粒。结果：10批颗粒中，腺苷的含量在2.706～4.132mg/g范围内，山奈酚-3-O-β-D-葡萄糖苷的含量在3.692～4.948mg/g范围内。结论：本研究所建立方法快速、准确、高效，能够对滋阴温阳活血颗粒的质量进行科学评价。 相似文献
10.
目的：通过测定指标性成分含量，比较配方颗粒和全方药材浸膏制备的滋阴温阳活血膏方的临床等效用量之间的差异。方法：含量测定采用高效液相色谱（HPLC）法，使用Phenomex Kinetex C18色谱柱（4.6mm×250mm，5μm），0.1%磷酸-乙腈为流动相，梯度洗脱，流速1.0ml/min，柱温30℃，进样量10μl，检测波长254nm；以腺苷和山奈酚-3-O-β-D-葡萄糖苷为指标性成分，共测定颗粒和浸膏配制的膏方各10批。结果：10批样品中，1g颗粒制备的膏方相当于0.957～1.043g浸膏制备的膏方，二者差异无统计学意义（P＞0.05）。结论：使用配方颗粒可以替代药材浸膏作为制作膏方的材料。 相似文献
11.
Arne Schnack-Friedrichsen Angela M. Davis Jim D. Bennell Dei G. Huws 《Marine Georesources & Geotechnology》2001,19(4):221-243
The interdependence between the seismo-acoustic properties of a marine sediment and its geotechnical/physical parameters has been known for many years, and it has been postulated that this should allow the extraction of geotechnical information from seismic data. Though in the literature many correlations have been published for the surficial layer, there is a lack of information for greater sediment depths. In this article, a desktop study on a synthetic seafloor model illustrates how the application of published near-surface prediction equations to subsurface sediments (up to several tens of meters burial depth) can lead to spurious predictions. To test this further, acoustic and geotechnical properties were measured on a number of sediment core samples, some of which were subjected to loading in acoustically-equipped consolidation cells (oedometers) to simulate greater burial depth conditions. For low effective pressures (representing small burial depths extending to around 10 meters subsurface), the general applicability of established relationships was confirmed: the prediction of porosity, bulk density, and mean grain size from acoustic velocity and impedance appears generally possible for the investigated sedimentary environments. As effective pressure increases through, the observed relationships deviate more and more from the established ones for the near-surface area. For the samples tested in this study, in some instances increasing pressure even resulted in decreasing velocities. There are several possible explanations for this abnormal behavior, including the presence of gas, overconsolidation, or bimodal grain size distribution. The results indicate that an appropriate depth correction must be introduced into the published prediction equations in order to obtain reliable estimates of physical sediment properties for greater subsurface depths. 相似文献
12.
Shigehisa Nakamura 《Marine Geodesy》2000,23(1):55-61
Specific properties of the interannual sea level variations and annual tides in the Northwestern Pacific were studied. Several tide stations were monitored. The monthly mean sea level for the year of 1995 was analyzed at each tide station. A seismic event in 1995, some tectonic activity around the subject area, and the Kuroshio (the oceanic western boundary current) may possibly contaminate results which would have occurred from the astronomical annual tide alone. 相似文献
13.
The effect of different fixation and storage protocols on the flow cytometric (FCM) simultaneous analysis of bacterioplankton and phytoplankton in coastal seawater samples (Mediterranean coastal lagoons) was investigated. FCM measurements (cell number, fluorescence and scatter characteristics) were obtained through DAPI staining. Three fixatives [glutaraldehyde (GA), formaldehyde (FA) and paraformaldehyde (PFA)] and two storage (3 months duration) methods (5 °C and −196 °C) were tested. Two dominant populations were detected in studied samples: bacteria and eukaryotic picophytoplankton. Adding fixatives (2% final concentration) appears necessary to obtain FCM exhaustive counts of all the bacteria and phytoplanktonic cells. This was related to the permeation effect of fixatives which allowed a better DAPI staining of the cells. Maximum fluorescence, i.e. optimal staining of the cells was obtained with FA or PFA, and significant lower fluorescences with GA. Fixed samples stored at 5 °C induced rapid cell loss. Only storage in liquid nitrogen of samples fixed with FA or PFA, allows mid-term (≥4 months) preservation of bacteria or picophytoplankton cell numbers, and limited evolution of DAPI-induced fluorescence and scatter characteristics. 相似文献
14.
Coastal inundation associated with extreme sea levels is the main factor which leads to the loss of life and property whenever a severe tropical cyclonic storm hits the Indian coasts. The Andhra and Orissa coasts are most vulnerable for coastal inundation due to extreme rise in sea levels associated with tropical cyclones. Loss of life may be minimized if extreme sea levels and associated coastal flooding is predicted well in advance. Keeping this in view, location specific coastal inundation models are developed and applied for the Andhra and Orissa coasts of India. Several numerical experiments are carried out using the data of past severe cyclones that struck these regions. The simulated inland inundation distances are found to be in general agreement with the reported flooding. 相似文献
15.
16.
《海洋学报(英文版)》2014,(9):F0003-F0003
<正>Acta Oceanologica Sinica(AOS)is a comprehensive academic journal edited by the Editorial Committee of Acta Oceanologica Sinica and is designed to provide a forum for important research papers of the marine scientific community which reflect the information on a worldwide basis.The journal publishes scholarly papers on marine science and technology,including physics,chemistry,biology, 相似文献
17.
Hoi-Soo Jung Kap-Sik Jeong Yong-Shik Chu Sung-Hyun Park Ki-Hyune Kim 《Marine Georesources & Geotechnology》2001,19(3):181-195
Grain size and water content in box-core sediments from the Clarion-Clipperton fracture zone (C-C zone) in the northeast equatorial Pacific were analyzed in detail to understand the downcore variations across a hiatus between Quaternary and Tertiary layers. Grain-size distributions in the topmost core sediments show two modes: a coarse mode (peaked at 50 μm) and a fine mode (at 2-25 μm). The coarse mode disappears gradually with depth accompanied by the dissolution of siliceous fossil tests, whereas the fine mode coarsens due to the formation of authigenic minerals. Water content increases abruptly across a color boundary between an upper pale brown layer and a lower dark brown layer that is the hiatus between Quaternary and Tertiary layers. Abundant smectites and microvoid molds, which are created by the prolonged fossil dissolution in the underlying sediment, are attributed for the abrupt downcore variation of water content. Overall variations in grain size and water content in the topmost core sediments in the western C-C zone are possibly constrained by the dissolution of biogenic siliceous fossils. Variations in geotechnical properties related to these changes must be considered in the design of nodule collectors. 相似文献
18.
Shigehisa Nakamura 《Marine Geodesy》2001,24(1):27-33
This article concerns an interrelation between the sea levels and the western boundary flow near a tectonic boundary in a local zone in the Northwestern Pacific. In this zone, sea level variations at stations located on the coast facing the Pacific are studied to find the interrelation between variations of the Kurosio flow as an index of the distance of the flow axis off a specific coast. The result is discussed after data processing of the monthly means of the sea levels, and a notice is taken of variations caused by active crustal upheavals during a seismic event, a local earthquake. 相似文献
19.
This study tests the hypothesis that the in situ void ratio of surficial marine sediments may be predicted from shear wave velocity-depth data with a reliability equal to that of other methods currently available. Shear wave velocity is fundamentally controlled by the number of grain-to-grain contacts per unit volume of material and by the effective stress across those contacts. In this study, three previously established empirical formulae are used to predict void ratio from velocity-depth data. Field data were acquired along a transect off the northern Californian coast across which water depth increased from 35 to 70 m and seafloor sediment type varied from sand to silty-sand, respectively. A towed seafloor sled device was used to collect shear wave refraction data, and a marked, systematic decrease in velocity was observed along the line, ranging from 35-70 m/s for the coarse, near-shore material to 25-40 m/s for the finer, offshore deposits. Void ratios predicted from these velocities were compared with data measured directly from box-core samples. Of the formulae used for prediction, two agree remarkably well with the control data. Both predicted and control values increase from 0.6-0.8 for the sandy material to 1.1-1.5 for the silty-sand. Thus, this study does not disprove the hypothesis set and demonstrates the potential of field shear wave velocity-depth data as a means of delineating spatial variation in void ratio for surficial marine sediments in a remote, nondestructive manner. 相似文献
20.
Particulate samples were collected from the Changjiang river system during a flood period, in May 1997, and POC, stable isotope and lipids associated with particles were examined. Results showed the decrease (0.84% ～ 1.88%) of organic carbon content from the upper reaches to the estuary.δ13C values of particulate organic carbon was in the range of -24.9×10-3 to -26.6×10-3, which were close to the isotopic signature of continental C3 vegetation. Total particulate n-alkanes concentrations varied from 1.4 to 10.1μg/dm3,or from 23.7 to 107μg/g of total suspended matter. Fatty acids were present in all the samples, from 1.4 to 5.4μg/dm3, with saturated and unsaturated straight-chain and branched compounds in the carbon number range from C12 to C30. Both δ13C and the ratio of carbon content to nitrogen content indicate the predominance of terrestrial inputs (soil organic matter) among the particles. The biomarker approach has been used to identify the relative portion of terrigenous and autochthonous fraction in the particulate samples. The distribution of fatty acids suggests a striking phytoplanktonic and microbial signal in most particle samples. The terrestrial alkanes are used to estimate the contribution of terrestrial inputs along the mainstream. 相似文献