HPLC法测定米诺地尔微乳中米诺地尔的含量

摘 要 目的：建立高效液相色谱法测定米诺地尔微乳中米诺地尔的含量。方法: 色谱柱:Diamonsil C18柱（200 mm×4.6 mm,5 μm）,流动相:甲醇 水 冰醋酸 十二烷基硫酸钠 (70 ∶〖KG-*4〗30 ∶〖KG-*4〗0.03 ∶〖KG-*4〗0.045)(v/v/v/w),流速：1.0 ml·min-1,检测波长：280 nm,进样量：10 μl,柱温：30℃。结果: 米诺地尔在5.00~100.00 μg·ml-1线性关系良好（r=0.999 7）,平均回收率为99.12%,RSD为1.60%（n=9）。结论: 该方法简便,准确,灵敏,重复性好,专属性强,可用于该制剂的含量测定。     

阿咖酚散中游离水杨酸检查方法的改进

摘 要 目的：建立HPLC法检查阿咖酚散中的游离水杨酸。方法: 色谱柱Welch Ultimate C18柱(250 mm×4.6 mm, 5 μm),流动相为乙腈 四氢呋喃 冰醋酸 水（22〖KG*9〗∶〖KG-*2〗5〖KG*9〗∶〖KG-*2〗5〖KG*9〗∶〖KG-*2〗68）,检测波长为303 nm,流速为1.0 ml·min-1。结果: 线性范围为1.500～75.000 μg·ml-1（r=0.999 9）,平均回收率为99.12%,RSD为0.75%（n = 9）,检出限为1.5 ng（S/N=3）。结论: 本方法简便准确、灵敏度高,稳定性比现行标准大幅提高,可用于阿咖酚散中游离水杨酸的检查。     

HPLC法测定不同产地垂盆草药材中木犀草苷的含量

摘 要 目的： 建立反相高效液相色谱法测定垂盆草药材中木犀草苷的含量。方法: 采用Waters SymmetryShield C₁₈ (250 mm×4.6 mm,5 μm) 色谱柱;以四氢呋喃 甲醇 水 磷酸（9〖KG*9〗∶〖KG-*2〗17〖KG*9〗∶〖KG-*2〗74〖KG*9〗∶〖KG-*2〗0.25）为流动相,流速为1.0 ml·min^-1,检测波长为350 nm,柱温为35℃,进样量为10 μl。结果: 木犀草苷在5.2～208.0μg·mL^-1（r=0.999 9）范围内呈现良好的线性关系;平均回收率为99.12％,RSD=0.94%（n=6）。结论:该方法简便、灵敏、准确、专属性强,重复性好,可作为垂盆草药材中木犀草苷含量测定的方法。     

复方枇杷喷托维林颗粒中甘草酸质量标准的建立

摘 要 目的：建立复方枇杷喷托维林颗粒中甘草酸的鉴别和含量测定方法。方法: 采用薄层色谱对甘草酸进行定性鉴别;采用高效液相法测定甘草酸含量,使用Techmate C18（250 mm×4.6 mm,5 μm）色谱柱;流动相为甲醇 0.2 mol·L-1醋酸铵 冰醋酸（60〖KG*9〗∶〖KG-*2〗39〖KG*9〗∶〖KG-*2〗1）;流速：1.0 ml·min-1;检测波长：250 nm,柱温：35℃;进样量：20 μl。结果: 薄层鉴别斑点清晰,阴性对照无干扰。在选定的色谱条件下,甘草酸在0.01～1.01 g·L-1的质量浓度范围内线性关系良好,r=1.000 0,平均加样回收率103.2%,RSD=1.8%（n=9）。结论: 本方法简便、准确,可用于该制剂的质量控制。     

复方枇杷喷托维林颗粒中吗啡的鉴别和含量测定

摘 要 目的：建立复方枇杷喷托维林颗粒中吗啡的鉴别和含量测定方法。方法: 采用薄层色谱对吗啡进行定性鉴别;采用高效液相法测定吗啡含量,使用Diamonsil plus C18（250 mm×4.6 mm,5 μm）色谱柱;流动相为乙腈 0.05 mol·L-1磷酸二氢钾 0.002 5 mol·L-1 庚烷磺酸钠（10 ∶〖KG-*4〗45 ∶〖KG-*4〗45）;流速1.0 ml·min-1;检测波长：220 nm。结果: 薄层鉴别斑点清晰,阴性对照无干扰。在选定的色谱条件下,吗啡在5.07～15.21μg·ml-1的质量浓度范围内线性关系良好(r=0.999 2),平均加样回收率为98.7%, RSD=1.9%（n=6）。结论: 本方法简便、准确,可用于该制剂中吗啡的质量控制。     

百苑止咳颗粒质量标准的建立

摘 要 目的：建立百苑止咳颗粒质量标准。方法: 采用薄层色谱法对桔梗、陈皮、甘草3味药材进行定性鉴别,采用HPLC法测定橙皮苷的含量。使用AlltimaTM C18（150 mm×4.6 mm,5 μm）色谱柱,流动相为甲醇 醋酸 水(35 ∶〖KG-*4〗4 ∶〖KG-*4〗61),流速为1.0 ml·min-1,检测波长为283 nm,柱温为40℃。结果: 薄层鉴别斑点清晰,阴性对照无干扰。橙皮苷进样浓度在5.80～232.08 μg·ml-1范围内与峰面积呈良好线性关系（r＝0.999 7）,平均加样回收率为100.6%,RSD为1.83%（n=6）。结论: 本方法快速、准确、专属性强,可作为百苑止咳颗粒质量控制的方法。     

HPLC-ELSD法测定托盘根药材中蔷薇酸的含量

摘 要 目的：建立托盘根药材中蔷薇酸的高效液相色谱-蒸发光散射检测（HPLC ELSD）测定方法。方法: 采用高效液相色谱法,蒸发光散射检测器。色谱柱：Vision HT C18 HL柱（250 mm×4.6 mm,5 μm）;柱温：35℃;流动相：甲醇 0.1%三氟乙酸（66〖KG*9〗∶〖KG-*2〗34）,流速：0.8 ml·min-1;ELSD条件：漂移管温度：90℃,载气流速：2.3 L·min-1。结果: 蔷薇酸进样量在0.155～4.346 μg范围内呈良好线性关系（r=0.999 9）,平均加样回收率为100.4%,RSD=1.88%（n=6）。结论: 该方法简便,结果准确,重复性好,可用于托盘根药材中蔷薇酸的含量测定。     

高速逆流色谱法测定卡泊三醇软膏的含量

摘 要 目的：建立高速逆流色谱法测定卡泊三醇软膏的含量。方法: 采用高速逆流色谱法,溶剂体系为正己烷 乙醇 水（2∶〖KG-*2〗1：〖KG-*2〗0.5,v/v/v）,进样量为1 ml,检测波长265 nm。结果:卡泊三醇在4.02～40.20 μg·ml^-1呈良好的线性关系（r=0.999 4）,平均回收率为99.2%,RSD为0.4%（n=9）。结论:高速逆流色谱法简单、快速、适用于卡泊三醇软膏的含量测定。     

HPLC法测定人血清中百草枯含量

摘 要 目的：建立HPLC法测定人血清中百草枯含量。方法: 色谱柱：Kromasil C18柱（200 mm×4.6 mm,5 μm）,流动相：乙腈 水（含0.03 mol·L-1庚烷磺酸钠,0.24 mol·L-1磷酸）=3〖KG*9〗∶〖KG-*2〗97（用三乙胺调pH至2.0）;检测波长258 nm;柱温25℃;进样体积20 μl;流速0.8 ml·min-1。结果: 百草枯在0.106~10.6 mg·L-1浓度范围内线性关系良好( r=0.999 3),最低检出浓度为0.065 mg·L-1。高、中、低3种浓度样品绝对回收率＞89.4%,方法回收率＞94.4%,日内精密度RSD在0.12%～1.74%之间,日间精密度RSD在0.44%～2.89%之间。结论: 该方法操作简便易行、灵敏度高、专属性强,适用于百草枯的人体血清浓度测定。     

乳浆草药材质量标准的建立

摘 要 目的：建立乳浆草药材的质量标准。方法: 采用薄层色谱法对乳浆草药材进行定性鉴别;采用HPLC法测定乳浆草药材中槲皮素含量,色谱柱为AlltimaTM C18柱（150 mm×4.6 mm,5 μm）,流动相为乙腈 0.4%磷酸溶液（30〖KG*9〗∶〖KG-*2〗70）,流速为1.0 ml·min-1,检测波长为360 nm,柱温为35℃。结果: TLC色谱中,供试品溶液在与对照药材色谱相同的位置上显相同颜色的斑点。HPLC法中槲皮素浓度在3.194～102.208 μg·mL^-1范围内时与峰面积呈良好的线性关系（r=0.999 9）,平均回收率为99.0%,RSD=1.68%（n=6）。结论: 该方法快速、简便,结果准确,可用于乳浆草药材的质量控制。     

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.     

Pharmacological treatment of COVID-19: an opinion paper

The precocity and efficacy of the vaccines developed so far against COVID-19 has been the most significant and saving advance against the pandemic. The development of vaccines has not prevented, during the whole period of the pandemic, the constant search for therapeutic medicines, both among existing drugs with different indications and in the development of new drugs. The Scientific Committee of the COVID-19 of the Illustrious College of Physicians of Madrid wanted to offer an early, simplified and critical approach to these new drugs, to new developments in immunotherapy and to what has been learned from the immune response modulators already known and which have proven effective against the virus, in order to help understand the current situation.     

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.