HPLC法测定羚黄氨咖敏片中马来酸氯苯那敏的含量

建立HPLC法测定羚黄氨咖敏片中马来酸氯苯那敏含量的分析方法。采用KromasilC18(150mm×4.6mm,5μm)色谱柱;以0.3%十二烷基硫酸钠溶液(取十二烷基硫酸钠,加水500mL,加磷酸0.25mL,用三乙胺调节pH值3.3±0.1)-乙腈(55∶45)为流动相;流速1.0mL/min;检测波长261nm;柱温:室温,进样量:20μL。马来酸氯苯那敏浓度在2.5～75μg/mL范围内呈良好的线性关系,(r=0.9999,n=6)。高、中、低3种浓度的平均回收率为100.15%。RSD平均值为0.77%(n=9)。HPLC法简便、准确,专属性强,灵敏度高,可有效控制羚黄氨咖敏片中马来酸氯苯那敏的含量。     

RP-HPLC法测定盐酸托莫西汀的含量和有关物质

目的:建立RP-HPLC法测定盐酸托莫西汀的含量和有关物质.方法:采用Kromasil C18(4.6mm×250 mm,5μm)色谱柱,流动相:乙腈-水-三乙胺溶液(40:60:0.5,冰醋酸调pH至6.0),流速:1.0 mL·min-1,检测波长:270 nm,柱温:室温.结果:有关物质与盐酸托莫西汀分离良好,盐酸托莫西汀在2.0～50.0mg·L-1 范围内线性关系良好(r=:0.9998),平均回收率为99.8%(RSD=1.7%),检测限为80 μg·L-1(S/N=3).盐酸托莫西汀与有关物质分离良好.结论:该方法操作简便、重复性好、专属性强,可用于测定盐酸托莫西汀的含量和有关物质.     

同规格不同生产厂家的色谱柱对胸腺法新有关物质测定结果的影响

目的:通过比较同规格不同生产厂家的色谱柱对胸腺法新有关物质测定结果的影响,对中国药典2010年版二部收录的胸腺法新有关物质测定法进行探索研究。方法:选用十八烷基硅烷键合硅胶为填充剂的色谱柱(4.6mm×250mm,5μm);流动相A:乙腈-水-磷酸(140:860:1);流动相B:乙腈-水-磷酸(250:750:1),采用梯度洗脱;流速:1.0mL/min;紫外检测波长:210nm;进样量:20μl;柱温:室温。结果:针对碱破坏样品,同规格不同厂家的色谱柱间测试结果存在明显差异。结论:在使用《中国药典》2010年版二部收录的胸腺法新有关物质检测项下检测方法,对胸腺法新及其制剂进行有关物质检查时,应先进行色谱柱的筛选。采用Thermo scientific Hypersil GOLD C18(250×4.6mm、5?m)、GRACE AlltimaHP C18(250×4.6mm、5μm)色谱柱检测,主峰与峰前邻近杂质峰的分离度好,结果准确可靠,可用于注射用胸腺法新有关物质的测定。     

肌苷酶电极生物传感器

为了构建肌苷酶电极生物传感器,以固定化核苷磷酸化酶(EC 2.4.2.1)、黄嘌呤氧化酶(EC 1.2.3.2)与过氧化氢电极组成电流型酶电极生物传感器,用于检测肌苷片中的肌苷,其输出电流可达500nA.结果发现,肌苷测定的线性范围为1-268 mg/L,精度:RSD小于0.14%,响应时间:60 s,使用寿命大于25 d,实际测定肌苷片中肌苷含量回收率:100.8%.由此表明:采用双酶电极法测定肌苷片中的肌苷含量,由于酶促反应专一性高、样品不需分离直接进样分析、处理条件温和、反应时间短暂因而结果较为可靠.     

硫酸铜络合法测定枸橼酸钾含量

目的:确定测定枸橼酸钾缓释片中枸橼酸钾含量的方法.方法:利用枸橼酸盐与Cu2+的络合物在紫外区有特定吸收,测定枸橼酸钾缓释片中枸橼酸钾的含量.结果:枸橼酸钾与硫酸铜形成络合物时最大摩尔比为1:1,枸橼酸钾浓度在10.78～53.9 ug/ml范围内,测定波长为(240±2)nm,吸收度与浓度呈良好线性关系,平均回收率为98.1%,RSD=1.85%(n=9).结论:方法、简单、准确,可作为枸橼酸钾缓释片中枸橼酸钾含量测定方法.     

新药23-羟基白桦酸的含量及其他三萜的RP-HPLC测定

目的:建立23-羟基白桦酸及有关物质的RP-HPLC测定方法。方法:高效液相色谱法,色谱柱为Agilent Zorbax SB-C18(250 mm×4.60 mm,5μm),流动相:乙腈-0.2%醋酸水溶液(62∶38),流速为0.8 mL.min-1;检测波长204 nm。结果:23-羟基白桦酸进样量与峰面积呈良好线性关系,线性范围为0.20~4.0μg,r=0.999 9(n=5);回收率为97.4%~104.7%(n=9)。结论:本法快速,简便,重复性好,可用于23-羟基白桦酸的含量测定和有关物质检查。     

利用超高效液相色谱和离子色谱法测定注射用磷酸川芎嗪的含量

目的:建立超高效液相色谱法(UPLC)和离子色谱法(IC)测定磷酸川芎嗪中川芎嗪和磷酸的含量,为质量评价提供依据。方法:UPLC测定川芎嗪的色谱柱为Waters Acquity BEH C18 (2.1 mm×50 mm,1.7μm);检测波长:300 nm检测川芎嗪,274 nm检测有关物质邻苯二甲酸二甲酯;流动相为0.1%甲酸水溶液(A)-0.1%甲酸乙腈(B),梯度洗脱(0.0～0.8 min,10%B→90%B;0.8～0.81 min,90%B→10%B;0.81～1.00 min,10%B),流速:0.7 m L/min。IC测定磷酸的离子交换色谱柱为Dionex IonPac AS11-HC-4μm (4×250 mm),流动相为30 mmol/L KOH溶液等度洗脱15 min,流速1.0 m L/min,柱温35℃;电导检测器;抑制器电流为50 m A。结果:川芎嗪和磷酸在10～100 g/m L内具有良好的线性关系,相关系数均为1.0,UPLC法测定川芎嗪的回收率为102.0%。IC测定磷酸的回收率为99.8%。7个公司生产的注射剂中川芎嗪的含量均在药典规定的范围90%～110%内。但是其中3个公司生产的注射剂磷酸超出药典规定范围90%～110%。结论:与常规HPLC/UPLC测定磷酸川芎嗪含量方法比较,本文所用方法测定结果更加准确、全面、且重复性好,能够真实反应注射用磷酸川芎嗪的实际含量,对于注射用磷酸川芎嗪的安全性和有效性评估提供了一定的依据。     

高效液相色谱法测定川射干鸢尾苷元磺酸钠及其制剂泰克吉宁注射液含量和有关物质

建立高效液相色谱法测定鸢尾苷元磺酸钠(4′,5,7-三羟基-6-甲氧基异黄酮-5′-磺酸钠)及其制剂泰克吉宁注射液的含量及有关物质。采用C18色谱柱(150×4.6mm,5μm),流动相为甲醇-5%醋酸水(80:20),流速为1.0mL/min,检测波长为263nm。鸢尾苷元磺酸钠在11～100μg/mL范围内线性关系良好,回归方程Y=43.3609X-1.5973(r=0.99998),平均回收率为99.77%(n=9)。最低检测限为0.052μg/mL,与有关物质分离良好。本法快速、简便、准确,专属性强。     

高效液相色谱法测定大鼠血浆中来那度胺的浓度及其药动学(英文)

目的:建立高效液相色谱法测定大鼠血浆中来那度胺的浓度。方法:色谱柱采用VenusilASBC18column(4.6 mm×250mm,5μm)购自于博纳艾杰尔科技有限公司。样品采用梯度洗脱,流动相为乙腈和0.05%甲酸溶液,流速为1.0 mL/min,检测波长为254 nm,以沙利度胺为内标。结果:来那度胺血药浓度的线性范围为0.1-5μg/mL,最低检测限为0.1μg/mL,三个浓度的QC样品(0.2,1 and 5μg/mL)的提取回收率分别为78.8±3.8,80.1±3.2 and 79.1±7.6%。结论:此方法准确、简便、灵敏度高,对来那度胺的血药浓度测定和药物代谢动力学研究极具价值。     

高效液相色谱法检测格列齐特缓释片中格列齐特含量的分析

目的采用高效液相色谱法对格列齐特缓释片中的格列齐特含量进行检测。方法用型号为Hypersil ODS2的250mm×4.6mm液相色谱柱,流动相为甲醇-水(60:40,磷酸调至pH 3.3),填料颗粒直径为5μm,检测波长为228nm,流速为1.0ml/min。结果格列齐特在0.6~6.0μg/ml浓度范围内呈良好的线性关系,平均回收率为99.32%,RSD=1.28%。结论应用高效液相色谱法对格列齐特缓释片中格列齐特含量进行测定,具有操作简便、重现性好,可用于该制剂格列齐特含量测定。     

Investigation of the mechanism of temperature sensitivity of the electroreceptors of ampullae of lorenzini

In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980.     

Principles of organization and evolution of systems of regulation of functions

Evolution of living organisms is closely connected with evolution of structure of the system of regulations and its mechanisms. The functional ground of regulations is chemical signalization. As early as in unicellular organisms there is a set of signal mechanisms providing their life activity and orientation in space and time. Subsequent evolution of ways of chemical signalization followed the way of development of delivery pathways of chemical signal and development of mechanisms of its regulation. The mechanism of chemical regulation of the signal interaction is discussed by the example of the specialized system of transduction of signal from neuron to neuron, of effect of hormone on the epithelial cell and modulation of this effect. These mechanisms are considered as the most important ways of the fine and precise adaptation of chemical signalization underlying functioning of physiological systems and organs of the living organism