反相高效液相法测定复方胆通胶囊中大黄酚及大黄素含量

目的建立反相高效液相细孔柱法,测定复方胆通胶囊中大黄素和大黄酚含量。方法色谱柱为ODS反相细孔柱(2.1 mm×250 mm,5μm),流动相为乙腈∶0.1%磷酸(v/v)=85∶15,流速为0.4 mL/min,检测波长为254 nm,柱温为30℃。结果复方胆通胶囊中大黄酚含量测定在0.01～0.15μg/g之间具有很好的线性关系(r=0.999 9),大黄素含量测定在0.02～0.24μg/g之间具有很好的线性关系(r=0.999 7)。结论实验所建立反相高效液相细孔柱法测定复方胆通胶囊中大黄酚和大黄素含量的方法成本低、灵敏度高、重现性好,可作为检测胆通胶囊中大黄酚和大黄素含量的标准方法。     

HPLC测定皮肤病血毒丸中大黄素与大黄酚含量

目的:用HPLC测定皮肤病血毒丸中大黄素与大黄酚含量。方法:色谱柱:C18色谱柱,流动相:甲醇-0．1％磷酸溶液(22:78),检测波长430 nm。结果:大黄素在0．01-0．1 μg,大黄酚在0．02～0．12 μg范围内呈良好的线性关系。平均回收率大黄素为98．8％(RSD=1．2％),大黄酚为99．0％(RSD=1．4％)。结论:该方法准确可靠。     

高效液相色谱法测定妇科消炎0号颗粒剂中大黄素和大黄酚的含量

目的:建立妇科消炎0号颗粒剂中大黄素和大黄酚含量测定的方法。方法:采用高效液相色谱法,色谱柱为Hypersil ODS2柱(250 mm×4．6 mm,5μm),流动相为甲醇-0．1％磷酸(83:17),波长为254 nm。结果:大黄素的线性范围为0．04～0．45μg,r=0．999 9;大黄酚的线性范围为0．04～0．48μg,r=0．999 9;大黄素和大黄酚的平均加样回收率分别为100．21％～101．45％,95．50％～95．95％,RSD分别为0．18％～1．2％,0．18％～0．70％(n=3)。结论:用高效液相色谱法测定妇科消炎0号颗粒剂中大黄素和大黄酚含量,方法准确、简便易行。     

HPLC法测定麻仁丸中大黄素和大黄酚的含量

目的:建立麻仁丸中大黄素和大黄酚含量测定的方法。方法:色谱柱为Thermo ODS C18柱(250 mm×4．6 mm,5μm),流动相为甲醇-0．1％磷酸溶液(85:15),流速为1．0 ml·min-1,检测波长为254 nm。结果:大黄素在0．01-0．29μg(r =0.999 5);大黄酚在0．03-0．52μg(r=0．999 4)范围内线性关系良好。大黄素及大黄酚的平均回收率分别为100.4％(RSD =0．9,n=5),100．1％(RSD=0．3％,n=5)。结论:方法准确可靠。     

HPLC法测定胆康片中大黄素、大黄酚的含量

目的：建立测定胆康片中大黄素、大黄酚含量的HPLC方法。方法：色谱柱为Waters ODS C18（150mm×4．6mm，5μm），流动相为甲醇-0．1％磷酸溶液（85：15），流速为1．0ml·min^-1，检测波长为254nm。结果：大黄素的线性范围为0．03～0．21μg（r=0．9999）、大黄酚的线性范围为0．06～0．50μg（r=0．9998），大黄素平均回收率为97．9％、RSD为0．2％（n=6），大黄酚平均回收率为97．6％、RSD为0．4％（n=6）。结论：建立的方法简便、重复性好，可用于胆康片中大黄素、大黄酚的含量测定。     

反相高效液相色谱法同时测定芩黄喉症胶囊3组分的含量

目的建立同时测定芩黄喉症胶囊中黄芩苷、大黄素及大黄酚含量的反相高效液相色谱法。方法色谱柱为Agilent C18柱，流动相为甲醇-0．4％磷酸水溶液，梯度洗脱，流速为1．0mL／min，检测波长为254nm，柱温为室温。结果黄芩苷、大黄素及大黄酚的质量浓度分别在8．8～1389mg／L（r=0．9999），0．52～86、54mg／L（r=0．9996），0．42～62．42mg／L（r=0．9998）范围内与峰面积呈良好线性关系。平均回收率分别为99．8％，100．4％，99．8％；方法精密度及重现性良好，RSD均不大于1、3％。结论反相高效液相色谱法简便准确且效率高，可作为芩黄喉症胶囊中黄芩苷、大黄素及大黄酚含量的测定方法。     

高效液相色谱法测定痔疮胶囊中大黄素和大黄酚的含量

目的：建立高效液相色谱法测定痔疮胶囊中大黄素和大黄酚含量的方法。方法：采用C18柱（250mm×4．6mm,5μm）,以甲醇-0．1％磷酸液（75：25）为流动相,流速为1．0ml·min^-1,检测波长为254nm。结果：痔疮胶囊中大黄素和大黄酚能有效分离,且无杂质干扰。大黄素在0．0261—0．1480μg（r=0．9999）、大黄酚在0．0509—0．2886μg（r=0．9998）均呈良好线性关系。大黄素和大黄酚平均回收率分别为99．0％和98．8％,（n=9,RSD均为1．3％）。结论：本法简便、快速、准确、可靠。     

HPLC法测定致康胶囊中大黄酸、大黄素和大黄酚的含量

目的建立高效液相色谱法同时测定致康胶囊中大黄酸、大黄素、大黄酚含量的方法。方法色谱柱：安捷伦Eclipse-XDB-C18柱（250mm×4．6mm,5um）;流动相：乙腈．水．冰醋酸（60：40：1）;流速：1．0mL·min^-1;检测波长：437nm。结果大黄酸平均回收率为98．26％．RSD为1．79％．大黄素平均回收率为99．1906。RSD为1．02％,大黄酚平均回收率为99．48％．RSD为01．85％。结论该方法简便、灵敏、准确,可作为致康胶囊的质量控制方法。     

超声提取法测定熊胆消炎胶囊中大黄素和大黄酚的含量

目的　建立熊胆消炎胶囊中大黄素和大黄酚的含量测定方法。方法　采用超声提取RP -HPLC法测定 ,用Shim packCLC -ODS柱 (6 0mm× 15 0mm ,5 μm) ,以甲醇 - 0 1%磷酸溶液 (85∶15 )为流动相 ,检测波长 2 5 4nm。 结果　大黄素的线性范围为 4 0 88～ 81.76ng(r=0 .9999) ,平均回收率为 99 3% ,RSD =0 93% (n =9) ;大黄酚的线性范围为 8 2 72～ 16 5 4 4ng(r =0 9999) ,平均回收率为 99 5 % ,RSD =1 86 % (n =9)。测定大黄素方法精密度RSD =0 .6 0 % (n =5 ) ,测定大黄酚RSD =0 6 5 %(n =5 )。结论　所用方法测定样品的分离效果佳 ,灵敏度高 ,重复性好 ,结果准确可靠。     

高效液相色谱法测定乌军治胆片中大黄素和大黄酚含量

目的建立乌军治胆片（乌梅、大黄、栀子、佛手）中大黄素和大黄酚含量测定方法。方法采用高效液相色谱（HPLC）法,以Hypersilcts柱（250mm×4．6mm,5μm）为固定相,甲醇-0．1％磷酸溶液（80：20）为流动相,检测波长254nm。结果大黄素与大黄酚的质量浓度线性范围分别为0．034～0．204mg／mL（r=0．9999）和0．1975～1．185mg／mL（r=0．9999）,平均加样回收率分别为97．89％和99．17％,RSD分别为0．57％和0．80％（n=6）。结论HPLC法简便准确,重复性好,可用于乌军治胆片的质量控制。     

Efficacy of gut lavage,hemodialysis, and hemoperfusion in the therapy of paraquat or diquat intoxication

Clinical and in vitro investigations were carried out to test the efficacy of gut lavage, hemodialysis, and hemoperfusion in the treatment of poisoning with paraquat or diquat. In a patient suffering from diquat intoxication 130 times more diquat was removed by gut lavage 30 h after ingestion than was removed by complete aspiration of the gastric contents.Determination of in vitro clearances for paraquat and diquat by hemodialysis showed that, at serum concentrations of 1–2 ppm, such as are frequently encountered in poisoning in man, toxicologically relevant quantities of herbicide cannot be removed from the body. At a concentration of 20 ppm, on the other hand, hemodialysis proved to be effective, the clearance being 70 ml/min at a blood flow rate of 100 ml/min. The efficacy of hemoperfusion with coated activated charcoal was on the whole better. Especially at concentrations around 1–2 ppm, the clearance values for hemoperfusion were some 5–7 times higher than those for hemodialysis.In a patient suffering from paraquat poisoning, both hemodialysis as well as hemoperfusion were carried out. The in vitro results could be confirmed: At serum concentrations of paraquat less than 1 ppm no clearance could be obtained by hemodialysis while by hemoperfusion with activated charcoal quite high clearance values were measured and the serum level dropped down to zero.

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Zusammenfassung Klinische Untersuchungen und Laboratoriumsversuche wurden durchgeführt, um die Wirksamkeit von Darmspülung, Hämodialyse und Hämoperfusion bei Paraquat- und Deiquat-Vergiftungen zu prüfen.Bei einem Patienten wurde 30 Std nach Deiquat-Aufnahme durch Darmspülung 130mal mehr Deiquat entfernt als durch vollständige Aspiration des Mageninhaltes. In vitro-Versuche ergaben, daß bei Blutserumkonzentrationen von 1–2 ppm, die bei Vergiftungen oft gemessen werden, durch Hämodialyse keine toxikologisch relevanten Paraquat- oder Deiquat-Mengen entfernt werden können. Dagegen erwies sich die Hämodialyse bei 20 ppm und einer Blutumlaufgeschwindigkeit von 100 ml/min mit einer Clearance von 70 ml/min als wirksam. Die Hämoperfusion mit beschicheter Aktivkohle war in diesen Versuchen aber eindeutig überlegen, denn insbesondere bei Konzentrationen um 1–2 ppm waren die Clearance-Werte 5–7mal höher als bei der Hämodialyse.Die in vitro-Ergebnisse wurden bei einem Patienten mit einer Paraquat-Vergiftung bestätigt: Bei Konzentrationen unter 1 ppm war die Hämodialyse wirkungslos, während durch Hämoperfusion relativ hohe Clearance-Werte erreicht wurden, so daß der Serumspiegel rasch unter die Nachweisgrenze abfiel.

     

In vitro studies on sterically stabilized liposomes (SL) as enzyme carriers in organophosphorus (OP) antagonism

This study describes a new approach for organophosphorous (OP) antidotal treatment by encapsulating an OP hydrolyzing enzyme, OPA anhydrolase (OPAA), within sterically stabilized liposomes. The recombinant OPAA enzyme was derived from Alteromonas strain JD6. It has broad substrate specificity to a wide range of OP compounds: DFP and the nerve agents, soman and sarin. Liposomes encapsulating OPAA (SL)* were made by mechanical dispersion method. Hydrolysis of DFP by (SL)* was measured by following an increase of fluoride ion concentration using a fluoride ion selective electrode. OPAA entrapped in the carrier liposomes rapidly hydrolyze DFP, with the rate of DFP hydrolysis directly proportional to the amount of (SL)* added to the solution. Liposomal carriers containing no enzyme did not hydrolyze DFP. The reaction was linear and the rate of hydrolysis was first order in the substrate. This enzyme carrier system serves as a biodegradable protective environment for the recombinant OP-metabolizing enzyme, OPAA, resulting in prolongation of enzymatic concentration in the body. These studies suggest that the protection of OP intoxication can be strikingly enhanced by adding OPAA encapsulated within (SL)* to pralidoxime and atropine.     

Aquatic Insects and Trace Metals: Bioavailability,Bioaccumulation, and Toxicity

Abstract

The uptake of metals from food and water sources by insects is thought to be additive. For a given metal, the proportions taken up from water and food will depend both on the bioavailable concentration of the metal associated with each source and the mechanism and rate by which the metal enters the insect. Attempts to correlate insect trace metal concentrations with the trophic level of insects should be made with a knowledge of the feeding relationships of the individual taxa concerned. Pathways for the uptake of essential metals, such as copper and zinc, exist at the cellular level, and other nonessential metals, such as cadmium, also appear to enter via these routes. Within cells, trace metals can be bound to proteins or stored in granules. The internal distribution of metals among body tissues is very heterogeneous, and distribution patterns tend to be both metal and taxon specific. Trace metals associated with insects can be both bound on the surface of their chitinous exoskeleton and incorporated into body tissues. The quantities of trace meals accumulated by an individual reflect the net balance between the rate of metal influx from both dissolved and particulate sources and the rate of metal efflux from the organism. The toxicity of metals has been demonstrated at all levels of biological organization: cell, tissue, individual, population, and community. Much of the literature pertaining to the toxic effects of metals on aquatic insects is based on laboratory observations and, as such, it is difficult to extrapolate the data to insects in nature. The few experimental studies in nature suggest that trace metal contaminants can affect both the distribution and the abundance of aquatic insects. Insects have a largely unexploited potential as biomonitors of metal contamination in nature. A better understanding of the physico-chemical and biological mechanisms mediating trace metal bioavailability and exchange will facilitate the development of general predictive models relating trace metal concentrations in insects to those in their environment. Such models will facilitate the use of insects as contaminant biomonitors.     

Alzheimer’s disease – current trends in basic and clinical research. Highlights from the 16th ECNP

Advances in the molecular biological knowledge of neuronal nicotinic acetylcholine receptors (nAChRs) have led to a growing interest by the pharmaceutical industry in the development of novel compounds that selectively modulate nAChR function. The ability of (-)-nicotine, an activator of nAChRs, to enhance attentional aspects of cognition in animals and humans, to exert neuroprotective and anxiolytic-like effects, and presumably to mediate the negative correlation between smoking and Alzheimer's (and Parkinson's) Disease, has focused interest on the potential therapeutic utility of modulators of nAChR function for treatment of some of the deficits associated with these progressive, neurodegenerative conditions. Numerous compounds are known which activate nAChRs and which might serve as lead compounds toward the development of such agents. The pharmacologic diversity of neuronal nAChR subtypes suggests the possibility of developing selective compounds which would have more favourable side-effect profiles than existing agents. This broader class of agents, collectively called cholinergic channel modulators (ChCMs), is anticipated to encompass compounds which would have more favourable side-effect profiles than existing agents, which generally exhibit low selectivity. This selectivity may be achieved by preferentially activating some subtypes of nAChRs (i.e., Cholinergic Channel Activators, ChCAs) or inhibiting the function of other subtypes (Cholinergic Channel Inhibitors, ChCIs). An overview of the biology of nAChRs and the rationale for the use of ChCMs for the treatment of dementia related to neurodegenerative diseases are presented, followed by a discussion of lead compounds and compounds under consideration for clinical evaluation.     

Steroidal sapogenin contents in some domestic plants

In order to find out the values of the steroid resources for the future use. the compositions and contents of steroidal sapogenins from 13 domestic plants have been investigated. As a result,Dioscorea nipponica, D. quinqueloba andSmilax china were found to have large amount of diosgenin. And pennogenin inTrillium kamtschaticum andParis verticillata, yuccagenin inAllium fistulosum, hecogenin inAgave americana and neochlorogenin inSolanum nigum were appeared to be major steroidal sapogenins.