Determination of Amino Acids in an Individual Erythrocyteby Capillary Electrophoresis with Intracellular FITC-derivatization and Laser-induced Fluorescence Detection

A novel approach for analysis of amino acids in individual erythrocytes was established. In this method, the derivatization reagent was introduced into the living cells by electroporation. After derivatization, the amino acids in a single cell were determined by capillary electrophoresis with laser-induced fluorescence detection.

Production of Polyclonal Antibody of Morphine and Determination of Morphine in Urine by Capillary Electrophoresis Immunoassay with Laser-induced Fluorescence Detection

N-Conjugated antigen was synthesized and polyclonal antibody with high specificity was obtained from immunizing animals. With this polyclonal antibody, a rapid and efficient CEIA-LIF method was developed to determine the free morphine in urine of abusers. The detection limit was calculated to be 40 ng/mL. Simulated urine samples were analyzed with good recoveries, which showed the feasibility of its application in specific morphine determination in urine of morphine abusers.

Mixed Micellar Electrokinetic Chromatographic Analysis of Colistin, Polypeptide Antibiotic, Using Laser-Induced Fluorescence Detection

The main goal of this work was to quantify the detection of colistin at low levels in urine samples through the practical application of mixed surfactant micellar electrokinetic chromatography–laser-induced fluorescence (MEKC-LIF) analysis method using its advantage of sensitivity and to examine direct injection of biological samples. Colistin (po- lymyxin E) has neither strong UV chromophore nor fluorophore. So, its assay for metabolism, pharmacokinetics studies for bioavailability and bioequivalence are difficult because of poor detectability. Therefore an enhanced UV or fluores-cence detection by chemical derivatization is required. MEKC-LIF method was proposed for colistin with a 488/520 nm argon-ion laser using a pre-CE derivatization with fluorescein isothiocyanate (FITC). Borate buffer was used as background buffer (BGB). The different parameters affecting the proposed derivatization reaction including concentration of the derivatizing reagent, reaction time and temperature were studied and optimized. The derivative was stable for up to 3 days. Different micelles (TX-100 and SDS) were examined as BGB additives separately but negative-charged mixed micelles (SDS/TX-100) were shown to be the best additive to BGB for the analysis of colistin particularly in human urine as they enhance both selectivity and sensitivity of the proposed method. BGB was used with pH 9.5, 10 kV, 8 s inj time, capillary length 75 cm × 75 μm ID (66 cm effective length), detection was LIF Ex 488 nm;Em 520 nm. The method was applied to colistin analysis in human urine and the recovery was > 98% (n = 5). LOD and LOQ in urine after pre-column derivatization using FITC were 100 and 250 ng/ml, respectively. Urine samples were analysed by direct injection without sample pre-treatment. The mechanism of enhancement of fluorescence of the derivative by surfactant was proposed.

Determination of metoprolol in rabbit blood using capillary electrophoresis with laser-induced fluorescence detection

This work described a sensitive method for determination of metoprolol in rabbit plasma.The method involved purification by ultrafiltration,derivatization with fluorescein isothiocyanate,determination by capillary electrophoresis（CE） coupled with laser-induced fluorescence（LIF） detector.Other components in plasma including a variety of amino acids and proteins did not interfere with the determination of metoprolol in experimental condition.The assay had a wide range（2.0-500 ng/mL） of linearity and a detection limit of 0.8 ng/mL.The intra- and inter-day precisions were satisfactory with relative standard deviation（RSD） less than 10.0%and accuracy within 10.0%.This method was successfully applied to pharmacokinetic study of metoprolol in rabbit blood.

Construction of Post-column Micro-membrane Reactor for Protein Analysis in Capillary Electrophoresis with Laser Induced Fluorescence Detection

Proteomics is becoming more and more mature, but the detection of low abundance proteins is still a difficult task. Laser-induced fluorescence（LIF） detection is one of the most sensitive detection methods in a capillary electrophoresis（CE） system. However, most proteins do not exhibit favourable native fluorescence, a derivatization procedure is necessary for LIF detection of proteins. Since the derivatization reaction between protein and fluorescent reagent takes place after the separation of protein, the separation cannot be compromised by multiple derivatization products, the post-column derivatization becomes an attractive method for derivatization in CE-LIF system.

Capillary electrophoresis of FITC labeled amino acids with laser-induced fluorescence detection

FITC labeled amino acids have been separated using a home-built capillary electrophoresis with a laser-induced fluorescence detection (CE-LIF) system. Seventeen peaks can now be generated from the twenty common amino acids. The key conditions lie in the optimization of pH, buffer electrolytes and buffer additives.

超声萃取-亲和毛细管电泳-激光诱导荧光法同时测定纺织品和食品塑料包装中16种多环芳烃的含量

通过优化背景电解液酸度及背景电解液中硼砂、羧甲基-β-环糊精(CM-β-CD)、二甲基-β-环糊精(DM-β-CD)的浓度,利用多环芳烃(PAHs)与CM-β-CD以及PAHs与DM-β-CD亲和力的差异,提出了提示方法。参考GB/T 28189-2011进行样品前处理,将样品剪成0.5 cm×0.2 cm的细条,分取1 g,加入50 mL环己烷,密封后于50℃超声提取1 h。冷却至室温,过滤,滤液用附激光诱导荧光检测器的高效毛细管电泳仪分析,背景电解液为含30 mmol·L^(-1)CM-β-CD、20 mmol·L^(-1)DM-β-CD和40 mmol·L^(-1)硼砂的混合溶液(pH 5.0),荧光检测波长为325 nm。结果显示:16种PAHs的质量浓度在0.01~0.5 mg·L^(-1)内与峰面积呈线性关系,检出限为0.002~0.040 mg·L^(-1);按照标准加入法进行回收试验,结果为91.4%~104%,测定值的相对标准偏差(n=5)为0.40%~6.3%。方法用于3种纺织品以及5种食品塑料包装的分析,8种样品均不同程度地检出了PAHs。

毛细管电泳-激光诱导荧光法测定细胞中谷胱甘肽

谷胱甘肽(GSH)在抵抗氧化应激和重金属解毒过程中发挥着重要作用,建立灵敏、准确的GSH定量分析方法对于研究细胞重金属毒性机制具有深远意义。该研究以肝癌细胞(HepG2)为研究对象,以活性基团为芳香邻二醛的2,3-萘二甲醛(NDA)为标记试剂,建立了一种高灵敏度的测定细胞中GSH含量的毛细管电泳-激光诱导荧光检测方法(CE-LIF)。实验考察了缓冲溶液的种类、pH、添加剂等对GSH与NDA的反应速率和NDA-GSH检测灵敏度的影响。比较了pH为7.4和9.2的三羟甲基氨基甲烷(Tris)缓冲溶液、pH为9.2的硼砂和Tris缓冲溶液中NDA-GSH的灵敏度和反应速率,结果显示在pH为9.2的硼砂缓冲溶液中NDA-GSH的灵敏度最高且反应速率最快。进一步比较了4种添加剂对NDA-GSH灵敏度的影响,结果显示以β-环糊精(β-CD)作为添加剂效果最好。在最优的实验条件下,GSH与NDA可以在5 min内达到反应平衡,3 min内检测到NDA-GSH电泳信号。采用外标法对细胞中的GSH进行定量分析,方法线性范围为0.01~20.00 mmol/L,GSH的检出限和定量限分别为0.006μmol/L和0.020μmol/L,加标回收率和标准偏差分别为95.7%~112.6%和3.8%~5.0%(n=3)。通过建立的方法对HepG2细胞中的GSH进行定量分析,并研究了As(Ⅲ)、As(Ⅴ)、Cr(Ⅲ)和Cr(Ⅵ)刺激细胞后胞内GSH的变化情况。结果表明,在研究剂量水平下,As(Ⅲ)、As(Ⅴ)和Cr(Ⅲ)不会影响HepG2细胞中GSH的含量,而高剂量Cr(Ⅵ)会导致GSH含量显著降低。结合元素毒性数据,说明HepG2细胞内GSH含量与细胞毒性相关,GSH含量会随着细胞毒性增大而降低。

集成毛细管电泳芯片系统的制作、测试及应用

使用标准光刻和化学湿法腐蚀技术 ,在玻璃板材上制作了由进样管道和分离管道构成的集成毛细管网路系统 ,对影响芯片质量的一些因素进行了讨论 ,并进行了性能测试和评价。芯片上毛细管道散热良好。使用激光诱导荧光和 CCD成像检测系统 ,以电渗作用为驱动力 ,对混合样品进行了进样、快速分离 ( 2 0 s以内 )和监测 ,证明了自制集成毛细管电泳芯片及检测系统的可行性。比较了两种注样方式 ( float和pinched)的不同 ;证明了在分离时可以优化加电策略 ,防止拖尾 。

电泳芯片的制作及其进样与分离

利用微细加工技术研究在玻璃上制作电泳芯片的方法 ,测试了微管道的伏安特性曲线。在该电泳芯片上进行了注样和分离实验 ,采用激光诱导荧光法进行检测 ,利用CCD拍摄了进样和分离的全过程。分析了在电泳芯片上施加不同的电压对样品注样的影响 ,给出了FITC OH和FITC

毛细管电泳-激光诱导荧光检测肌腱和肌腱细胞中的羟脯氨酸

建立毛细管电泳-激光诱导荧光检测(CE-LIF)分析羟脯氨酸的方法。肌腱和肌腱细胞中的胶原蛋白碱水解生成氨基酸,经异硫氰酸荧光素(FITC)衍生,采用LIF-CE分离测定胶原蛋白特异性氨基酸-羟脯氨酸。羟脯氨酸在0.5μg/L^8×103μg/L浓度范围内线性关系良好;检出限为0.5μg/L。相对迁移率和相对峰高的相对标准偏差(RSD)分别为5.0%和6.1%。测定了60份肌腱和9份细胞样品,加标回收率为95%~110%。将所建立的毛细管电泳方法与高效液相色谱法(HPLC)进行比较,两者测定结果相对误差为-1.9%~2.0%。本法仅需一次荧光标记,操作简单、快速灵敏,12min内完成一个分析周期,适于测定肌腱和细胞样品。

毛细管电泳-激光诱导荧光法测定草甘膦、草胺膦及氨甲基膦酸

建立了一种快速、有效的毛细管电泳分离-激光诱导荧光检测有机磷除草剂草甘膦、草胺膦和草甘膦的代谢物氨甲基膦酸的方法。将荧光衍生试剂5-(4,6-二氯三嗪基)氨基荧光素(DTAF)成功用于衍生上述3种化合物。最佳衍生条件:DTAF的浓度为1.0μmol/L,以50 mmol/L硼酸(pH 9.5)作为缓冲溶液,在30℃下反应40 min。以pH 9.5的30 mmol/L硼酸缓冲溶液(含15 mmol/L Brij-35)作为电泳背景电解质,3种衍生物得到基线分离。在优化的条件下,草甘膦、草胺膦、氨甲基膦酸的检出限分别为3.21、6.14和1.99 ng/kg。将该方法应用于环境水样和土壤中除草剂及代谢物的测定,回收率为91.3%～106.0%。该方法准确、灵敏,可满足环境样品中有机磷农药及其代谢物残留的检测要求。

毛细管电泳手性分离-激光诱导荧光检测普萘洛尔对映体

用异硫氰酸荧光素衍生普萘洛尔,衍生产物用毛细管电泳分离,激光诱导荧光方法检测.在含有10 mmol/L β-CD,50 mmol/L 硼砂(pH=9.0)的溶液中,普萘洛尔对映体得到了基线分离.本方法线性范围宽(R型:2.0×10-3～1 mg/L), 灵敏度高(检出限均为1.24 μg/L),可用于活体中普萘洛尔对映体的药代动力学研究.

毛细管电泳免疫分析法分析雌三醇

利用一种温敏水凝胶作为毛细管电泳的填充介质 ,建立了毛细管电泳免疫分析血清中雌三醇的方法。研究了缓冲溶液的浓度和pH值、水凝胶的浓度、电压等因素对分析结果的影响。雌三醇的检出限和线性范围分别为 3 1 .6ng L和 5 0～ 5 0 0 0ng L。

芯片毛细管电泳激光诱导荧光快速分离检测麻黄碱类兴奋剂

研究用芯片毛细管电泳激光诱导荧光检测系统分离测定经7-chloro-4-nitrobenzo-2-oax-1，3-diazole（NBD-Cl）衍生的麻黄碱和伪麻黄碱的实验条件。采用胶束毛细管电动色谱分离体系（12mmol／L SDS＋10mmol／L硼砂缓冲液，pH9．0），在45mm长的通道上实现了麻黄碱和伪麻黄碱的快速分离，一次分离小于1．5min。10—100ms／L范围内，峰高与浓度呈良好的线性关系，麻黄碱、伪麻黄碱的检出限分别是0．83mg／L和1．10mg／L。所建立的方法应用于尿中麻黄碱和伪麻黄碱的分离测定，取得满意的结果。

激光诱导荧光检测微流控芯片生化分析仪的研制

研制出一种集激光诱导荧光检测、微流控芯片电泳及控制系统于一体的生化分析仪。分析仪内采用可重复使用的玻璃基质微流控芯片,利用销式固定技术实现芯片的精确定位,定位精度达到±2μm。以四触点高电压系统控制芯片上的进样和电泳分离操作。激光诱导荧光检测系统采用正交光路模式,对Cy5染料的检出限达到1.0×10-10mol/L(S/N=3)。以羟乙基纤维素为筛分介质,初步进行了ΦΧ174-HaeШdigest DNAmarker限制性片段的毛细管电泳分离。

加压毛细管电色谱-激光诱导荧光法检测4种黄曲霉毒素

建立了三氟乙酸（ TFA）柱前衍生,加压毛细管电色谱-激光诱导荧光（ pCEC-LIF）快速测定黄曲霉毒素B1、B2、G1、G2方法。使用粒径1.8μm的C18毛细管色谱柱,以甲醇-水（45：55, V/V,含0.05%甲酸）为流动相,泵流速为0.05 mL/min,分离电压为15 kV,激发波长为375 nm,发射波长为450 nm,黄曲霉毒素B1, B2, G1, G2达到基线分离。各组分的检出限（S/N=3）分别为0.02,0.016,0.008和0.01μg/L,在0.1-10μg/L,0.1-10μg/L,0.1-3.0μg/L,0.1-3.0μg/L 范围内分别呈线性相关,相关系数 R2分别为0.9999,1.0000,0.9995,0.9997。将本方法应用于花生酱的分析,加标回收率在90.0%-112.0%之间,RSD在0.5%-1.9%之间。

毛细管电泳-激光诱导荧光检测装置的研制及应用

目的 自行组建高效毛细管电泳 -激光诱导荧光分析装置。方法 以波长 5 4 3.5 nm He- Ne激光为激发光源 ,滤色片 -单色仪分光 ,光电倍增管检测 ,用计算机采集和处理电泳图谱。结果 优化了毛细管电泳 -激光诱导荧光检测装置的设计和分析参数 ,用该装置获得了高信噪比毛细管电泳谱。对罗丹明类荧光试剂 (Sulforhdam ineB)溶液的检出限为 10 - 9m ol/ L,线性范围为 1× 10 - 6～ 1× 10 - 9mol/ L。采用该装置检测了分枝杆菌 DNA的 PCR扩增产物、酶切产物以及人血清白蛋白。结论 所组建的高效毛细管电泳 -激光诱导荧光分析装置结构合理 ,灵敏度高 ,成本低、光路校准方便 ,分离效能明显高于常规琼脂糖电泳 ,能作为研究生物样品中 DNA片段和蛋白质含量的有效检测手段。

雌二醇的水凝胶毛细管电泳免疫分析

In this paper, a kind of thermally linear polymer, poly N isopropylacrylamide(PNIPA) was packed into capillary electrophoresis, which can be used to separate bound and free estradiol antigen. A useful method for determination of estradiol in serum by hydrogel capillary electrophoretic immunoassay(CEIA) was developed. The influence of concentration and pH of buffer, concentration of hydrogel, applied voltage, temperature etc has been studied. The limit of detection and the linear range of estrodiol were 30 pg/mL and 0 1—10 ng/mL. [WT5HZ]

毛细管电泳分离-激光诱导荧光检测生物胺

采用新合成的6-氧-[(1-琥珀酰亚胺)氧酰甲基]-荧光素乙酯(SOFE)作为柱前衍生试剂,毛细管电泳分离-激光诱导荧光检测了乙醇胺(EOA)、组胺(His)、甲胺(MA)、乙胺(EA)、酪胺(TYR)及苯乙胺(PEA)6种生物胺。在硼酸-硼砂缓冲溶液(pH8.5)中,室温(25℃)下衍生10min。用pH8.5的含25mmol/LSDS15%(V/V)乙腈的40mmol/L硼酸盐溶液作为电泳缓冲溶液,6种衍生物在15min内完全分离,检出限在2.5×10-11～8×10-11mol/L之间。该方法应用于酱油中生物胺的测定,结果令人满意。