酸性染料比色法测定川贝母中贝母素甲含量

目的建立川贝母中贝母素甲含量测定方法。方法酸性染料比色法,在411 nm波长处测定吸收度计算含量。结果贝母素甲在14.06~126.54μg.mL-1呈线性关系,r=0.999 7,平均回收率为96.6%,RSD=1.6%。结论贝母素甲可作为川贝母的质量控制指标。     

UPLC-MS/MS同时测定乳核内消液中的贝母素甲、贝母素乙、西贝母碱和湖贝甲素

目的 采用超高效液相色谱-串联质谱法同时测定乳核内消液中贝母素甲、贝母素乙、西贝母碱、湖贝甲素的含量。方法 经超声离心后,采用YMC-Triart C₁₈色谱柱(150 mm×2.1mm, 3μm),流动相为乙腈-0.1%甲酸溶液,梯度洗脱,流速0.3 mL·min^-1,柱温35℃;质谱采用ESI⁺离子源,多反应监测模式检测。结果 贝母素甲、贝母素乙、西贝母碱、湖贝甲素等的线性范围分别为0.119～23.72μg·mL^-1(r=0.9958)、0.120～23.94μg·mL^-1(r=0.9951)、0.105～20.93μg·mL^-1(r=0.9942)、0.109～21.72μg·mL^-1(r=0.9900),平均回收率(n=6)分别为99.4%(RSD=2.00%)、98.3%(RSD=2.20%)、100.9%(RSD=1.90%)、98.7%(RSD=2.50%)。结论 所用方法同时测定了乳核内消液中4种生物碱成分的含量,方...     

HPLC-ELSD法测定桔贝合剂中贝母素甲与贝母素乙的含量

目的建立高效液相色谱-蒸发光散射检测器(HPLC-ELSD)法同时测定桔贝合剂中贝母素甲和贝母素乙含量。方法采用Thermo Hypersil GOLD C_(18)(250 mm×4.6 mm,5μm)色谱柱,乙腈-水-二乙胺(60∶40∶0.03)为流动相,柱温为25℃,流速为1.0 mL·min~(-1);ELSD参数:漂移管温度为85℃,载气流速为2.0 L·min~(-1)。结果贝母素甲在0.572~5.720μg(r=0.9998),贝母素乙在0.795~7.950μg(r=0.9996)与峰面积的对数值呈线性关系;平均加样回收率分别为99.0%(RSD=0.93%)和99.4%(RSD=0.64%)。结论该方法准确可靠、重复性好,为提高桔贝合剂的质量标准提供了科学依据。     

HPLC-ELSD法测定清肺抑火丸中贝母素甲、贝母素乙的含量

目的建立高效液相色谱-蒸发光散射检测法测定清肺抑火丸中贝母素甲、贝母素乙含量的方法。方法采用Acclaim 120-C18色谱柱,柱温30℃;乙腈-0.03%二乙胺溶液(65∶35)为流动相,流速为1.0mL/min;蒸发光散射检测器检测,漂移管温度为85℃,载气压力30psi。结果在选定的色谱条件下,分别以贝母素甲、贝母素乙峰面积的常用对数(Y)对浓度的常用对数(X)进行线性回归,回归方程分别为Y1=1.5548X1+2.8331(r=0.9998)、Y2=1.3907X2+3.0166(r=0.9997),线性范围分别为30.4~136.8μg/mL、5~35μg/mL;贝母素甲和贝母素乙的平均回收率分别为102.0%、102.2%,方法精密度(RSD,n=6)分别为0.83%、0.80%。结论该法可用于清肺抑火丸中贝母素甲、贝母素乙的含量测定。     

HPLC-ELSD法同时测定平贝母中贝母素甲、贝母素乙的含量

目的：建立HPLC—ELSD法同时测定平贝母中贝母素甲、贝母素乙含量的方法,并对市售样品进行考察,制定含量限度。方法：色谱柱：Waters C18色谱柱（150mm×4．6mm,5μm）,流动相：乙睛-二乙胺-水（70：0．03：30）,流速：1．0ml·min^-1,ELSD参数：漂移管温度90℃,载气流速为2．2L·min^-1。结果：贝母素甲、贝母素乙分别在0．06～0．35μg和0．08—0．50μg范围内线性关系良好。平均回收率（n=6）分别为98．4％,98．9％,RSD分别为1．8％,1．9％。结论：此法简便,快捷,结果可靠,可用于平贝母药材的质量评价,为今后其质量标准的修订提供了依据。     

HPLC测定浙贝母花中的贝母素甲和贝母素乙

目的 采用HPLC-ELSD法测定浙贝母花中贝母素甲和贝母素乙的含量.方法 色谱柱为Zorbax EclipseXDB-C18(150 mm ×4.6 mm,5μm),流动相为乙腈-0.1％二乙胺溶液,梯度洗脱.结果 贝母素甲、贝母素乙的线性范围分别为0.25～2.0、0.10～0.80 μg·mL-1;加样回收率分别为96.11％ 、91.15％,RSD分别为4.51％、5.79％(n=6);测定了14批浙贝母花中贝母素甲、贝母素乙的含量.结论所用方法准确、简便、灵敏度高,适用于浙贝母花药材的含量测定和质量评价.     

HPLC-ELSD测定黄氏响声丸中贝母素甲和贝母素乙的含量

目的：建立黄氏响声丸中贝母素甲和贝母素乙的含量测定方法。方法：采用HPLC法,色谱柱：Agilent ZORBAX SB—C18柱（4．6mm×250mm,5μm）,流动相为乙腈-水-二乙胺（65：35：0．03）,流速为1．0mL·min^-1,柱温为30℃;SOFTA-300SELSD型蒸发光散射检测器（漂移管温度85℃,雾化室温度50℃）。结果：贝母素甲进样量在0．5056—10．1120μg范围内,贝母素乙进样量在0．4106～8．2120μg范围内,其进样量的自然对数与峰面积积分值的自然对数有良好的线性关系（r〉0．9990）,贝母素甲和贝母素乙平均加样回收率分别为97．69％和97．39％,RSD分别为1．61％和1．37％。结论：该方法稳定、重复性好,结果准确,可作为黄氏响声丸中贝母素甲和贝母素乙的含量测定方法。     

HPLC-ELSD法测定复方川贝母片中贝母素甲的含量

目的：建立复方川贝母片中贝母素甲的含量测定方法.方法：用Agilent-ODS C18（250mm×4.6mm,5μg）枉,流动相为乙腈-水-二乙胺（70：30：0.3） ELSD漂移管温度70℃ 氮气流速2.0L·min-1 柱温35℃.结果：贝母素甲与相邻峰得到很好分离,进样量在0.165～0.990 μg时线性关系良好（r=0.999 2） 平均加样回收率为98.52%（RSD=2.56%）.结论：本法结果准确,便于操作,可作为复方川贝母片的质量控制方法之一.     

HPLC-ELSD测定金贝痰咳清颗粒中贝母素甲和贝母素乙的含量

目的：建立高效液相色谱法测定金贝痰咳清颗粒中贝母素甲和贝母素乙的含量。方法：流动相：乙腈-水-二乙胺（63∶37∶0.03）,流速为1.0mL·min-1色谱柱为TURNER Kromasil 100A C18（4.6mm×250mm,5μm）;SEDEX-75蒸发光散射检测器：漂移管温度40℃,载气压力3.5MPa。结果：贝母素甲、贝母素乙线性范围分别为0.682～10.23μg,0.726～10.89μg,平均回收率分别为96.6%,96.9%;RSD分别为6.0%,6.3%（n=6）。结论：方法简便、快速、准确,为提高和完善该制剂的质量标准提供了依据。     

蝉贝合剂中贝母素甲的含量测定

目的运用高效液相色谱-蒸发光散射检测法(HPLC-ELSD)测定蝉贝合剂中有效成分贝母素甲的含量。方法采用Agilent 1200 LC高效液相色谱仪,以甲醇-乙腈-0.5%醋酸溶液(10∶18∶72)为流动相,流速0.7 mL·min-1,Alltech 3300蒸发光散射检测器检测。结果贝母素甲线性范围为0.25～2.50 mg·mL-1,平均回收率为104.6%,RSD=1.5%。结论 HPLC-ELSD测定蝉贝合剂中贝母素甲含量,方法有效,实用。     

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.

     

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.     

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.     

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.