高效液相色谱法测定鼠脑谷氨酸脱羧酶活性

应用高效液相色谱-电化学检测技术建立了鼠脑谷氨酸脱羧酶(GAD)活性的测定方法.方法快速,灵敏.总分析时间为9min.γ-氨基丁酸的最低柱上检测限为50fmol.天内及天间相对标准差分别小于4.3%和9.8%.测得CAD最大催化速率为0.723nmol/min/mg蛋白.讨论了最佳衍生化pH及色谱条件.     

Fluorimetric Assay for the Determination of Glutamic Acid Decarboxylase Activity in Subregions of Rat Brain Tissue

Abstract

A modification of the spectrofluorimetric method of Lowe et al ¹ for the measurement of glutamic acid decarboxylase (GAD) activity in rat brain is described. This method involves the indirect determination of GAD activity by measurement of the formation of gamma-amino-butyric acid (GABA). The minimum activity of GAD observable was 0.45 μg GABA/hour/mg protein and the limit of detection was 0.20 × 10^?6 M GABA. This method was developed for measurement of GAD activity of gabaergic terminals in globus pallidus, endopeduncular nucleus, substantia nigra, and ventromedial thalamus in rat brain.     

Urinary Uric Acid Determination by Reversed-Phase High Pressure Liquid Chromatography

Abstract

Reversed-phase high pressure liquid chromatography with UV detection was proven to be a powerful method for the separation and quantitation of urinary uric acid. We have compared three different treatments for urine samples previous chromatographic injection: alkaline methanol extraction, ethylacetate extraction and centrifugation. It was also studied storage conditions for urine samples.

Our findings show that the method has high specificity and reproducibility for urinary uric acid. Samples are stables and require only centrifugation previous injection to the chromatograph.     

高效液相色谱法测定大鼠血浆中的原儿茶酸

建立了大鼠血浆中原儿茶酸含量测定的高效液相色谱方法。采用的色谱柱为DiamondsilTM C18 柱(150 mm×4.6 mm,5 μm);流动相为乙腈-水(体积比为9∶91,用H3PO4 调pH至2.5);流速1.2 mL/min;检测波长260 nm;内标为对羟基苯甲酸。原儿茶酸的线性范围为0.050~3.20 mg/L,线性相关系数为0.9978，最低定量限为0.050 mg/L,日内和日间测定的精密度（以相对标准偏差表示）均低于7.0%,准确度（以相对误差表示）为-1.4%～2.6%；在0.050,0.40,3.20 mg/L低、中、高3个添加浓度水平下，血浆样品的提取回收率分别为83.4%,87.3%,91.1%。该方法简便,灵敏,准确,适用于大鼠体内原儿茶酸的药物动力学研究。     

高效液相色谱/电化学法测定大鼠血液和脑组织中单胺类物质的含量

建立了高效液相色谱／电化学检测法测定大鼠脑组织和血液中单胺递质及其代谢产物的方法。能同时测定去甲肾上腺素（NE）、肾上腺素（E）、3,4-二羟基苯乙酸（DOPAC）、多巴胺（DA）、高香草酸（HAV）、5-羟色胺（5-HT）,并能和内标3,4-二羟卞胺（DHBA）分离良好。本方法快速、简便,回收率为92％-105％,线性范围2．8-680ng／mL,检出限为0．05ng（S／N=3）。本方法已应用在服用中药的大鼠下丘脑组织及血液的测定中,数据显示,本法能满足测定要求。     

Determination of Pentachlorophenol Laurate by High Pressure Liquid Chromatography

Abstract

Pentachlorophenol Laurate (PCPL) in canvas is determined by extraction and chromotography on silica gel. Conditions are chosen to eliminate peak splitting due to the presence of different “laurate” fatty acids. The determination is faster and more specific than previously reported methods.     

痕量神经肽的高效液相色谱

本文选用芴甲氧羰基氯(FMOC-CL)作为肽的荧光衍生试剂,建立了两段淋洗分离测定神经肽RP-HPLC的方法。衍生反应简便、快速、衍生物稳定。FMOC-脑啡肽、FMOC-P物质在18min内全部被洗脱。本方法在1～100pmol具有良好的定量线性关系。当信噪比为2.5:1时,检测极限:FMOC-甲硫脑啡肽为405fmol,FMOC-亮脑啡肽337fmol,FMOC-P物质为500fmol。并且能够容易地脱去衍生基团得到反应前的神经肽。     

Determination of Amikacin Isomers by High Pressure Liquid Chromatography

Abstract

A high-pressure liquid chromatographic (HPLC) method for quantitative monitoring of amikacin isomers is described. Four isomers, BB-K8, BB-K29, BB-K6 and BB-K11 were applied to a silica gel column. While adsorbed, the isomers were derivatized with o-phthalaldehyde and the derivatized products eluted with ethanol. A decrease in the fluorescence of the derivatized products with time was observed. Heating at 50°C for 5 min produced products with stable fluorescence for at least three hours. Using the fluorescent properties of the amikacin derivative for detection, the four isomers of amikacin were separated by reverse phase (HPLC). A linear relationship from 1 to 10 μg/mL was obtained for all four isomers.     

高效液相色谱-质谱法测定大鼠不同脑区的硫酸酯型神经甾体

应用高效液相色谱-质谱联用技术,以雌酮硫酸酯为内标,建立了大鼠不同脑区硫酸酯型神经甾体的测定方法。甾体分两步萃取,第一步用氯仿-仲丁醇(体积比为1∶1)提取甾体硫酸酯,然后经固相萃取纯化。溶剂解使甾体硫酸酯形成游离型甾体,然后用衍生化试剂进行衍生化,再用液相色谱-质谱分离测定。初步研究发现,雄性SD大鼠不同脑区神经甾体孕烯醇酮硫酸酯和脱氢表雄酮硫酸酯的含量分别为(4.14±1.33) ng/g和(2.26±0.76) ng/g(垂体),(1.98±1.13) ng/g和(1.80±0.93) ng/g(下     

Simultaneous Determination of Salicylic Acid and Salicyluric Acid in Plasma and Urine by High Pressure Liquid Chromatography

Abstract

A sensitive, rapid, and specific high pressure liquid chromatographic (HPLC) assay was developed for the determination of salicylic (SA) and salicyluric (SU) acids in plasma and urine. The compounds are extracted into ethyl ether at acid pH, evaporated, and reconstituted prior to instrumental separation. Overall recovery of both compounds is 90 ± 5%, and the sensitivity limits are 150 ng of SU and 300 ng SA per ml of biological fluid. The assay was used for the determination of both compounds in plasma and urine of man following oral doses of 40 mg/kg of sodium salicylate.     

Method for Determination of Codeine and Morphine in Rat Whole Blood by High Pressure Liquid Chromatography

Abstract

A HPLC method to simultaneously determine codeine and morphine in rat whole blood has been developed and evaluated. This method is based on a selective extraction and reversed-phase chromatography which results in chromatograms with 220 to 3500 theoretical plates for morphine and codeine. Detection is by electrochemical oxidation at +1.2V vs Ag/AgCl. In this method, the procedure of blood centrifugation for plasma preparation is eliminated. Therefore, the blood volume required is decreased and the sensitivity of analysis is considerably increased. Concentrations of codeine and morphine are low as 2ng/ml can be quantitated in as little as 100 mcl of rat whole blood.     

Determination of Sterigmatocystin in Fungal Cultures by High Pressure Liquid Chromatography

Abstract

Levels of sterigmatocystin in cultures of various fungal strains were determined by high pressure liquid chromatography (HPLC). This mycotoxin was well separated using acetonitrile / water / acetic acid (55/45/2) as solvent on a μ-Bondapak C18 column (Waters Associates). It was detected by its absorbance at 320 nm. Using this method, sterigmatocystin can thus be simply and rapidly determined in mould strain cultures.     

微柱液相色谱和电化学检测法测定鼠脑微透析液中神经传递物质

报道了使用微柱色谱和电化学检测器测定鼠脑微透析液中神经传递物质的方法。儿茶酚胺，５－羟色胺和代谢物的检测限为 ０． １～０． ５ ｐｇ。含有乙酰胆碱酯酶和胆碱氧化酶的柱后反应器使分离后的乙酰胆碱和胆碱转化成过氧化氢．再用铂电极或过氧化物酶修饰过的玻碳电极检测过氧化氢。乙酰胆碱的检测限当使用怕电极时是５０× １０－１５ｍｏｌ，当使用酶修饰电极时是１０×１０－１５ｍｏｌ。     

反相高效液相色谱法测定磷酸果糖激酶的活性

采用反相高效液相法(RP-HPLC)测定磷酸果糖激酶的活性.将磷酸果糖激酶与含有果糖-6-磷酸和ATP的反应体系混合,置于30℃水浴中,反应20 min后,沸水浴3 min终止反应.通过RP-HPLC测定酶反应前后产物二磷酸腺苷(ADP)量的变化来分析酶的活性.ADP的生成量在5～400 mg/L范围内具有良好的线性关系,方法的精密度良好(RSD<5%).本方法与通常所用的酶偶联法(ECM)相比准确度高,且简便易行.     

高效液相色谱法测定间羟基苯甲酸

用高效液相色谱法测定了间羟基苯甲酸的含量。在反相Ｃ１８柱上,用甲醇－水（ｐＨ２．５）作流动相,紫外２３０ｎｍ检测,以间甲基苯甲酸作内标定量,方法简便、可靠,变异系数为０．２５％～０．３４％。     

Determination of Isocyanic Acid in Air by High Performance Liquid Chromatography

Abstract

Isocyanic acid in air is determined quantitatively by collection in a scrubber solution of N-4-nitrobenzyl-N-n-propylamine. The urea derivative, which is formed, is determined by using reverse phase high performance liquid chromatography.     

高效液相色谱法测定牙膏中的氨甲环酸

建立了丹磺酰氯柱前衍生/高效液相色谱测定牙膏中氨甲环酸(TA)的方法。牙膏经甲醇提取、氮吹至干,再用丹磺酰氯进行衍生。衍生物通过X-Bridge C18色谱柱(250 mm×4.6 mm×5μm)分离,以乙腈和0.1%甲酸水溶液为流动相梯度洗脱,在紫外波长250 nm条件下进行定量测定。系统考察了缓冲溶液p H值、衍生温度和衍生时间对氨甲环酸衍生效率的影响。结果表明,在优化实验条件下,氨甲环酸衍生物与基体杂质达到有效分离,在1~425 mg/L范围内线性关系良好,相关系数为0.999 5;在20,200,1 600 mg/kg 3个加标浓度下的回收率为98.7%~102%,相对标准偏差为0.85%~2.5%,方法检出限为2.0 mg/kg。该方法准确、可靠、灵敏度高,适用于各类牙膏中氨甲环酸的测定。     

茶叶样品中绿原酸含量的高效液相色谱法测定

建立了茶叶绿原酸含量测定的择相高效液相色谱法,采用PecosphereC18柱,以甲醇－水（体积比18：20,水中含φ＝1／61的甲酸）淋洗,用紫外检测器于326nm处测定,各组分的色谱峰达到基线分离。绿原酸在0．02－4．02μg范围内线性关系良好,线性相关系数 r＝0．9996。在安徽黄山产贡菊和安徽产金银花中加标的回收率分别为86．8％、102．0％,该法已用于十多种茶趺实际样品的测定。     

高效液相法测定叶酸片中叶酸的含量

建立了高效液相色谱法测定叶酸片中叶酸含量的方法。采用Symmetry C18色谱柱(150×4.6mm,3.5μm),以磷酸盐缓冲溶液(PBS,pH=6.3)为流动相,检测波长254nm,柱温35℃。叶酸在0.04～0.36μg/mL范围线性良好(r=0.9999),平均加标回收率为99.4%(RSD=0.44%)。该方法简便准确,精密度良好,适用于叶酸片中叶酸含量的测定。     

The Determination of Folic Acid (Pteroylmonoglutamic Acid) in Fortified Products by Reversed Phase High Pressure Liquid Chromatography

Abstract

A reversed phase HPLC method was developed for the separation and determination of pteroylglutamic acid (PGA) in fortified foods. Extraction was carried out by heating with phosphate-citrate buffer, pH 8.0 containing ascorbate, and incubation with papain at 40°C for 4 hrs. The extracts were purified and concentrated on a short DEAE column which was rinsed with phosphate buffer, pH 7.0, of increasing molarity. PGA was eluted with 0.1M phosphate buffer, pH 7.0, containing 0.5M NaCl. The eluants were chromatographed on a Spherisorb ODS 10 μm column (250 × 4.6 mm) using a 30 min linear gradient of 2% to 30% acetonitrile in 0.1M acetate buffer, pH 4.0, at 1 ml/min and an absorbance detector at 280 nm. The coefficients of variation on analysis of 8 replicate samples of a milk and soy protein based infant formulas were 5.9% (at 4.6 ng/50 μl inject) and 6.8% (at 1.8 ng/50 μl inject) respectively.