核磁共振法测定奥扎格雷钠含量

利用核磁共振波谱技术对国家级新药奥扎格雷钠的测定可行性进行了研究,建立了用非待测物为内标的定量测定奥扎格雷钠含量的方法.方法的线性回归系数为0.9986,稳定性试验RSD平均值为0.32%,重复性试验RSD平均值为0.27%,与常规的奥扎格雷钠测定方法相比,本方法具有快速、简单、准确、不破坏样品等优点.     

高效液相色谱法测定硫酸氢氯吡格雷中的有关物质

建立高效液相色谱法测定硫酸氢氯吡格雷中的有关物质的方法。其分解产物的检测,采用SinoChrom ODS-BP（200mm×4.6mm,5μm）色谱柱,以1%（V/V）三乙胺（pH=4.0）-乙腈（25∶75）为流动相,检测波长225nm,流速1.0mL/min。硫酸氢氯吡格雷在0.48—0.72μg范围内线性关系良好（r=0.9999）,定量下限为3ng,检出限为0.6ng,各种破坏性样品的分离度符合规定。其光学纯度的测定采用ULTRON ES-OVM（Analytical）手性柱（150mm×4.6mm,5μm）,色谱填料为L57。以磷酸盐缓冲液（pH=4.67）-乙腈（75∶25）为流动相,检测波长为220nm。硫酸氢氯吡格雷相关物质B分离度均大于2.5,符合要求。本方法简便,灵敏,准确,专属性强,能够满足硫酸氢氯吡格雷对有关物质测定的要求。     

奥扎格雷对蘑菇酪氨酸酶的抑制动力学

抗血小板凝聚药奥扎格雷不仅抑制酪氨酸酶单酚酶活性,而且对二酚酶具有很强抑制。导致单酚酶活力和二酚酶活力下降50%的奥扎格雷浓度(IC50)分别为1.35mmol/L和3.45mmol/L。奥扎格雷对单酚酶的抑制效应主要表现于酶催化反应的延滞时间有明显的延长。奥扎格雷对二酚酶的抑制作用表现为可逆的竞争性和非竞争性混合型抑制。     

HPLC测定甲磺酸托烷司琼的有关物质

建立HPLC测定甲磺酸托烷司琼的有关物质。采用C18色谱柱,以甲醇-水-乙腈-三乙胺(565:40:35:0.3,V/V/V/V)为流动相A,以甲醇-水-乙腈-三乙胺(800:100;100:0.24,V/V/V/V)为流动相B,梯度洗脱检查有关物质;检测波长为284nm。甲磺酸托烷司琼检出限为0.24ng,主成分与其有关物质能完全分离。方法简便、准确、专属性好,可用于甲磺酸托烷司琼有关物质的测定。     

小剂量吲达帕胺片的质量标准

对已设计的吲达帕胺片剂处方进行筛选、工艺优化,并建立高效液相色谱法进行吲达帕胺片剂的有关物质检测.采用Hypersil ODS2(200mm×4.6mm,5μm)色谱柱,流动相为冰乙酸-乙腈-甲醇-0.2g/L EDTA二钠(0.1∶20∶20∶60,V/V/V/V),流速为1.0mL/min,检测波长为254nm,柱温为40℃.有关物质的检查方法完善了现版《中国药典》标准的色谱系统,更准确地进行杂质分析及限量,专属性强,可满足吲达帕胺片剂的有关物质测定.     

RP-HPLC法测定氨苯砜的有关物质

建立反相高效液相色谱法测定氨苯砜的有关物质.采用Waters SunFire C18 (250mm×4.6mm,5μm)色谱柱,流动相为乙腈-0.01mol/L磷酸二氢钠溶液(20∶80,V/V)到(80∶20,V/V)进行梯度洗脱,测定波长为296nm,柱温25℃,流速为1.0mL/min.氨苯砜与其有关物质能完全分离,样品中最多可检测出6个有关物质,单个杂质含量小于0.1％,总杂质含量小于1％.该方法准确、可靠,能有效进行氨苯砜有关物质的限量检查.     

ICP-AES快速测定土壤中硫含量

采用ICP-AES研究土壤中硫含量的测定.以王水消解土壤试样,优化全谱型ICP-AES分析条件测定土壤中S的含量,检出限为5.7ng/mL(180.7nm)和8.6ng/mL(182.0nm).测定土壤标准物质中的S含量,测定结果在标称值范围内,连续测定10个平行样其相对标准偏差均小于2%.方法快速、简单、准确.     

人血浆中吲哒帕胺的测定

在碱性条件下用二氯甲烷提取,以甲磺酸多沙唑嗪为内标,采用XDBC18反相柱(5μ),质谱检测器采用AP-ESI,正离子模式,采集方式为SIM,流动相为乙腈-水-醋酸-醋酸铵(50:50:0.1:0.2,V/V),用液相色谱-质谱联用法(LC-MS)测定人血浆中吲哒帕胺浓度.吲哒帕胺在1-150ng/mL范围内线性关系良好,提取回收率大于80%,精密度(RSD)均小于10%,检出限为1.0ng/mL.该法方便、准确、灵敏,适用于吲哒帕胺缓释制剂的药代动力学研究,也可以用于临床测定吲哒帕胺血浆药物浓度.     

高效液相色谱法测定工业废水中的硝基酚

采用反相高效液相色谱法,Nucleosil(R)C18柱(250×4.6mm,5μm),以甲醇∶水=60∶40(V∶V,pH值约为3)流动相,采用紫外检测器,检测波长280nm,在室温条件下测定工业废水中硝基酚类的含量.在0.02598-0.1299 mg/mL范围内邻硝基苯酚钠浓度与峰面积线性关系良好,线性相关系数为0.9992,平均回收率为94.36%,精密度RSD为3%;在0.02573-0.1286 mg/mL范围内对硝基苯酚钠浓度与峰面积线性关系良好,线性相关系数为0.9996,平均回收率为96.54%,精密度RSD为5%;间硝基苯酚钠在0.02515-0.1257 mg/mL浓度范围内,峰面积与浓度呈现良好的线性关系,线性相关系数为97.34%,平均回收率为103.08%.此方法操作简便,适用于生产质量控制.     

HPLC测定盐酸法舒地尔的有关物质

建立HPLC测定盐酸法舒地尔的有关物质.采用C18色谱柱,以甲醇-磷酸二氢铵溶液(30 ∶ 70,用磷酸调pH值至3.5±0.05)为流动相;检测波长为275nm.盐酸法舒地尔检测限为0.3mg/mL,主成分峰与其有关物质能完全分离.本方法简便、准确、专属性好,可用于盐酸法舒地尔有关物质的测定.     

催化动力学分析法测定粗硒粉中微量碲的研究

提出基于Te(Ⅳ)催化S2-还原亚甲基蓝褪色反应,建立了新的测定微量碲的动力学分析方法。研究了催化反应条件,并测定了催化反应的表观活化能为68.94 kJ·mol-1,反应速率常数为1.63×10-2 s-1。Te(Ⅳ)浓度在20～220 ng·mL-1范围内服从比尔定律,回归曲线的线性方程为y=0.003 8x+0.219 1,相关系数r=0.999 5,方法的检出限为3.04 ng·mL-1。应用于粗硒粉中微量碲的测定,相对标准偏差为3.1%(n=7),加标回收率为98.4%～100.4%。     

Sensitive Spectrofluorimetric Determination of Cytochrome c with Spirocyclic Rhodamine B Hydrazide in Micellar Medium

A new spectrofluorimetric method for the determination of cytochrome c using spirocyclic rhodamine B hydrazide (RBH) as fluorogenic reagent in the presence of sodium dodecylbenzene sulfonate (SDBS) surfactant micelles was developed. The method was based on the reaction of cytochrome c with RBH, a colorless, nonfluorescent spirolactam of rhodamine B in SDBS micelles to give highly fluorescent rhodamine B and hence led to a large increase in fluorescence intensity. The dynamic range and detection limit for the determination of cytochrome c are 4.0–120 ng ml⁻¹ and 0.87 ng ml⁻¹ (3σ), respectively. The optimal conditions for the detection of cytochrome c were evaluated and the possible detection mechanism was also discussed.     

HPLC-DAD测定利培酮中有关物质

运用二极管阵列检测器结合峰纯度分析建立利培酮有关物质HPLC的测定方法。采用C18色谱柱(Kromasil,C18,5μm,4.6×200mm),以1.0%三乙胺缓冲溶液(以磷酸调节pH值至3.0)∶乙腈(70∶30)为流动相,流速为0.8mL/min,柱温为30℃,检测波长为260nm。利培酮与有关物质分离良好,原料1、中间体1、中间体2以及利培酮检出限分别为0.4、4、0.4、0.6ng。二极管阵列检测器结合峰纯度分析可用于HPLC测定利培酮有关物质时色谱条件的选择和评价,本方法简单、快速、专属性好、灵敏度高。     

乙基紫共振瑞利散射光谱法测定葡聚糖硫酸钠

在Britton-Robinson缓冲介质(pH 9.0～10.5)中,单独的乙基紫与葡聚糖硫酸钠的共振瑞利散射都非常微弱,当二者反应形成结合物时将导致溶液共振瑞利散射明显增强,并产生新的共振瑞利散射光谱,其3个明显的散射峰分别位于348.0,509.8和680.0 nm处,且均可作为测定波长。以ΔI值最高且线性关系较好的509.8 nm作为测定波长时,葡聚糖硫酸钠在0.005～2.4 μg·mL-1范围内与共振瑞利散射强度成线性关系,检出限为3.25 ng·mL-1。研究了葡聚糖硫酸钠-乙基紫体系的紫外-可见吸收光谱,讨论了溶液酸度、乙基紫浓度、反应时间、温度、离子强度等实验条件的影响,考察了共存物质对该体系测定葡聚糖硫酸钠的影响。实验表明该方法有高的灵敏度和较好的选择性,应用于合成样品的测定。     

Flow injection determination of metoclopramide based on KMnO4—HCHO chemiluminescence in a micellar medium

A novel flow injection chemiluminescence (CL) analysis method for the determination of metoclopramide in the presence of sodium dodecyl sulfonate (SDS) surfactant micelles is described. This method is based on the luminescent properties of the KMnO₄-HCHO-metoclopramide in acid medium sensitized by SDS. The optimized experimental conditions were evaluated and the possible mechanism was discussed. The CL increase is linearly related to the concentration of metoclopramide in the range 0-80.0 μg/ml with a detection limit of 31.3 ng/mL (S/N=3).The relative standard deviation for 20.0 μg/ml samples was 2.6% (n=11). The proposed method has been successfully applied to the determination of metoclopramide in tablets.     

Chemiluminescence Determination of Sodium New Houttuyfonate in Pharmaceutical Preparations Based on Tween 80—Rhodamine B System

Strong chemiluminescence (CL) emission was observed when sodium new houttuyfonate (SNH) was mixed with Tween 80 in sulfuric acid medium in the presence of rhodamine B. Base on this phenomenon, a sensitive flow injection-CL method for the determination of SNH was developed. Under the optimum conditions, the CL emission is linearly with SNH concentration in the range 8.0–4000 ng mL⁻¹, with a detection limit of 2.7 ng mL⁻¹ (3σ). As a preliminary application, the proposed method was successfully applied to the determination of SNH in pharmaceutical preparations. The possible CL mechanism was also discussed in this paper.     

Highly Sensitive Synchronous Fluorescence Measurement of Danofloxacin in Pharmaceutical and Milk Samples Using Aluminium (III) Enhanced Fluorescence

A simple, rapid and sensitive constant wavelength synchronous fluorescence method is developed for the determination of danofloxacin (DAN) in pharmaceutical formulations and its residue in milk based on Al(III) enhanced fluorescence. The synchronous fluorescence intensity of the system is measured at 435?nm using ? λ?=?80?nm and an excitation wavelength of 280?nm. A good linear relationship between enhanced fluorescence intensity and DAN concentration is obtained in the range of 3-100?ng?mL(-1)(r (2)?=?0.9991). The limit of detection (LOD, S/N?=?3) of the present method is 0.9?ng?mL(-1). The proposed method can be successfully applied to the determination of DAN in pharmaceutical formulations and in milk without serious interferences from common excipients, metal ions and other co-existing substances. The method can be used as a rapid screening to judge whether the DAN residues in milk exceed Maximum Residue Limits (MRLs) or not.     

原子荧光光谱法测定水性涂料中可溶性汞

应用原子荧光光谱法测定水性涂料中可溶性汞，对影响测定的参数进行了优化，汞的检出限为0.03ng/mL。