柱前衍生化高效液相色谱-荧光检测法测定桑叶中的1-脱氧野尻霉素

采用柱前衍生化高效液相色谱-荧光检测法测定了桑叶中的1-脱氧野尻霉素(DNJ)。用0.05 mol/L HCl提取桑叶中的DNJ,采用6-氨基喹啉基-N-羟基琥珀酰亚氨基甲酸酯(AQC)试剂在pH 8.5硼酸盐缓冲液下对DNJ进行衍生化,以0.02 mol/L磷酸二氢钾缓冲液(pH 5.0)-乙腈(体积比为85∶15)为流动相,利用C18色谱柱(5 μm,250 mm×4.6 mm)分离,在激发波长为250 nm、发射波长为395 nm条件下进行荧光检测,DNJ的AQC衍生物与衍生化试剂的水解产物分离良好。方法的线性范围为0.5～25 mg/L,检出限为0.02 mg/L（S/N=3）。实验测得桑叶中DNJ含量为0.12%;回收率为96.1%～98.6%。     

液相色谱法测定果蔬汁中柠檬黄和日落黄方法优化

对液相色谱法测定果蔬汁中柠檬黄和日落黄进行了方法优化,对色谱条件进行了调整,采用ODS-C18型(250 mm×4.6 mm)色谱柱,流动相甲醇-0.02 mol/L乙酸铵(体积比40∶60,pH4),流速为0.6 mL/min。采用紫外检测器,柠檬黄检测波长为430 nm,日落黄检测波长为510 nm。该方法测定结果的相对标准偏差为柠檬黄1.3%(n=4)、日落黄2.3%(n=4)。柠檬黄和日落黄的平均回收率分别为84.17%、88.33%。该法满足实验要求。     

高效液相色谱法测定2,6-二甲基吡喃酮和乙酰丙酮的含量

2,6-二甲基吡喃酮是一种重要的有机中间体,建立了高效液相色谱分离测定合成2,6-二甲基吡喃酮反应体系中2,6-二甲基吡喃酮和乙酰丙酮含量的方法.采用Eclipse XDB-C18色谱柱(150 mm×4.6 mm,5 μm),检测波长240 nm,柱温30 ℃,流动相为四氢呋喃-水(20:80,V/V,含0.5% N...     

固相萃取/反相高效液相色谱法对血清中胰岛素的测定

采用固相萃取纯化血清样品,荧光胺柱前衍生,建立了反相高效液相色谱/荧光检测血清中胰岛素的方法.色谱条件:LunaC5柱(100 mm×4.6 mm,5 μm)分离,流动相为乙腈-Tris缓冲溶液(10 mmol/L,pH 8.5)梯度洗脱,流速:1 mL/min.激发波长(λex)273 nm,发射波长(λem)476 nm,进样量20 μL.结果表明:胰岛素在10 ～800 μg/L范围内峰面积和质量浓度呈良好的线性关系,相关系数r为0.997 1;检出限为5 μg/L.日内、日间精密度分别为1.5%、1.0%,回收率为92%.     

高效液相色谱法测定水性酚醛树脂中残留的甲醛和苯酚

采用高效液相色谱法同时测定了水性酚醛树脂粘稠液体中残留的甲醛和苯酚,用2,4-二硝基苯肼对甲醛进行衍生化,然后进行色谱分离。色谱柱:Waters Symmetry C18 (5 μm,4.6 mm × 250 mm);柱温:30 ℃;流动相:甲醇-水(体积比为43∶57);检测波长:苯酚270 nm,甲醛360 nm;运行时间:45 min;流速:0.8 mL/min。方法的相对标准偏差小于5%,检测限小于1 μg/L,加标回收率为96%~105%。使用该分析方法可对该类树脂的质量性能进行有效监控。     

高效液相色谱法同时检测8种喹诺酮类兽药残留量

建立了吡哌酸、氧氟沙星、环丙沙星、单诺沙星、恩诺沙星、沙拉沙星、(噁)喹酸和氟甲喹8种喹诺酮类兽药残留量的高效液相色谱-荧光检测方法. 方法的线性范围: 30～2000 μg/kg, 定量限为30 μg/kg, 检出限为5 μg/kg (吡哌酸为20 μg/kg). 该方法采用基质分散和微波萃取技术进行样品的前处理, 回收率为70.0%～99.5%, 相对标准偏差1.0%～8.5%. 并同固相萃取方法进行了比较, 分别使用了RPS、HLB、MAX 3种固相萃取柱, 其回收率均低于本法. 确立了以Aglient XDB-C18 (5 μm, 150 mm×4.6mm i.d.)色谱柱, H3PO4-纯水-三乙胺-乙腈(pH 3.0)为流动相的最佳色谱条件, 吡哌酸、氧氟沙星、环丙沙星、单诺沙星、恩诺沙星、沙拉沙星的检测波长为: 激发波长285 nm, 发射波长460 nm;(噁)喹酸和氟甲喹为: 激发波长325 nm, 发射波长365 nm. 方法可满足兽药残留检测要求.     

聚苯乙烯凝胶色谱柱分离头孢呋辛钠聚合物杂质

建立了聚苯乙烯基质的凝胶色谱柱系统对头孢呋辛钠中聚合物杂质(或称缩合物杂质)的分离分析方法.凝胶色谱柱为MKF-GPC-100柱(100 mm×7.8 mm,5 μm),流动相为0.01 mol/L的磷酸盐缓冲液(pH 7.0)-乙腈(70:30,体积比),流速1.0 mL/min,检测波长254 nm.头孢呋辛钠与其...     

高效液相色谱法测定新雪颗粒中栀子苷的含量

建立了新雪颗粒中栀子苷含量的高效液相色谱测定方法。色谱柱为Diamonsil C18(200 mm×4.6 mm i.d., 5 μm), 流动相为乙腈-水(体积比为15∶85),流速1.0 mL/min,检测波长238 nm,进样量20 μL。栀子苷在25~400 mg/L时其浓度与峰面积呈良好的线性关系,方法平均回收率为101.2%,相对标准偏差(RSD)为1.6％。     

高效液相色谱-二极管阵列检测法测定L-丙氨酸与L-氨基丙醇

建立了柱前衍生同时测定L丙-氨酸、L氨-基丙醇的高效液相色谱方法。色谱条件为:Shim-pack VP-ODS柱(150 mm×4.6 mm.ID.,5μm);二极管阵列检测器;流动相为甲醇-磷酸盐缓冲溶液(NaH2PO4浓度为0.02 mol/L,pH 4.00 H3PO4调节)(体积比为30∶70),流速为0.5 mL/m in,检测波长为222 nm,柱温为30℃。L丙-氨酸与L氨-基丙醇的线性范围分别为2.30~178 mg/L和9.3~8690 mg/L;检出限分别为1.1 mg/L和1.6 mg/L;日内、日间测定的相对标准偏差(RSD)分别为0.22%、0.46%和0.02%、0.03%。     

食用菌中多菌灵残留的分散固相萃取/高效液相色谱法测定

建立了食用菌中多菌灵残留量的测定方法.采用乙腈提取样品,提取液经十八烷基硅烷(ODS)和乙二胺-N-丙基硅烷(PSA)吸附净化后,采用反相高效液相色谱-紫外可见检测器进行测定,外标法定量.色谱条件:色谱柱为Agilent Eclipse XDB C18柱(4.6 mm×150 mm,5 μm,i.d.),流动相为甲醇-0.02 mol/L磷酸盐缓冲溶液(pH 7.4)(体积比25 ∶ 75),流速1 mL/min,柱温30 ℃,检测波长282 nm.结果表明,多菌灵在0.05 ～10 mg/L质量浓度范围内线性良好,相关系数为0.999 9;方法的相对标准偏差(RSD)不大于3.4%,添加回收率为81% ～98%;多菌灵在食用菌中的检出限(LOD)和定量下限(LOQ)分别为0.03、0.10 mg/kg.该方法操作简单快速、准确度高,能够满足多菌灵残留限量标准的检测要求.     

Quantification of glutathione in plasma samples by HPLC using 4-fluoro-7-nitrobenzofurazan as a fluorescent labeling reagent

A rapid and highly sensitive high-performance liquid chromatograpy method with fluorescence detection has been developed for determination of glutathione (GSH) in human plasma. A simple pre-column derivatization procedure with 7-flouro-4-nitrobenzo-2-oxa-1,3-diazole (NBD-F) reagent was employed. The separation of the derivatized glutathione was performed using a mobile phase consisting of phosphate buffer (0.02 mol/L, pH 6.0)-acetonitrile (77:23, v/v) at a flow rate of 1.0 mL/min with the column temperature 2°C. The eluted derivatives were fluorometrically detected at an excitation wavelength 470 nm and an emission wavelength 530 nm. Under the optimum chromatographic conditions, the calibration curve was linear over the range of 0.1 μmol/L to 10.0 μmol/L with the correlation coefficient of 0.9988. The precision of the method was satisfactory with the intra- and inter-day coefficient of variation being 6.3%, 6.9%, respectively. This method has been used to determine glutathione concentrations in plasma samples from healthy individuals.     

超高效液相色谱法同时测定纺织品中18种荧光增白剂

建立了同时测定纺织品中18种荧光增白剂（FWAs）的超高效液相色谱-荧光检测（UPLC-FLR）法。试样由三氯甲烷-乙醇（6：4,v/v）超声提取,以ACQUITY UPLC HSS T3柱（100 mm×2.1 mm,1.8 μm）为分离色谱柱进行分析,以5 mmol/L乙酸铵水溶液和甲醇为流动相,梯度洗脱,流速为0.4 mL/min,荧光激发波长为350 nm,发射波长为430 nm,外标法定量。18种FWAs在各自范围内呈良好的线性关系,相关系数（R²）均≥ 0.9992;方法的定量限（LOQs,S/N=10）为0.002~0.1 mg/L。样品的平均加标回收率为88.3%~104.5%,相对标准偏差（RSD）为2.0%~5.5%（n=6）。该方法灵敏度高,精密度好,准确度高,适用于各种纺织品中FWAs的测定。     

高效液相色谱-荧光检测法测定牛奶中氯霉素的残留量

建立了对牛奶中氯霉素的残留量进行检测的高效液相色谱-荧光检测方法。氯霉素还原后在温和条件下与荧光胺发生衍生化反应,采用十八烷基键合硅胶固定相,以乙腈/四氢呋喃/0.02 mol/L醋酸钠-醋酸缓冲液(pH 6.0)(体积比为16∶8∶76)为流动相,流速1.0 mL/min,柱温40 ℃,荧光检测激发波长为410 nm,发射波长为508 nm。在上述实验条件下,氯霉素检测的线性范围为0.4~800 μg/L (r2=0.9999),检出限为0.2　μg/L。当空白样品中氯霉素添加水平为2~40 μg/L时,该方法的回收率为66.6%~92.8%,相对标准偏差为4.5%~9.4%。该方法适用于牛奶中氯霉素痕量残留的监测,具有干扰小、选择性好、灵敏度高等优点。     

整体柱离子对色谱-间接紫外检测法快速测定N-甲基,丙基吗啉阳离子

建立了快速分析无紫外吸收的N-甲基,丙基吗啉阳离子的离子对色谱-间接紫外检测法。采用反相C18硅胶整体柱,以背景紫外吸收试剂-离子对试剂-有机溶剂为流动相。研究了背景紫外吸收试剂、检测波长、离子对试剂、有机溶剂、柱温、流速对吗啉阳离子测定的影响。最佳色谱条件为:(0.5 mmol/L对氨基苯酚盐酸盐-0.1 mmol/L庚烷磺酸钠)溶液-甲醇(9:1, v/v)为流动相,检测波长230 nm,柱温30 ℃,流速1.0 mL/min。在此条件下,N-甲基,丙基吗啉阳离子的保留时间为2.966 min,检出限为0.07 mg/L(S/N=3),峰面积的相对标准偏差为2.1%(n=5),保留时间的相对标准偏差为0.02%(n=5)。将此方法用于分析实验室合成的N-甲基,丙基吗啉离子液体,加标回收率为98.8%。结果表明本方法简便、快速。     

Determination of the pyridinium metabolite derived from haloperidol in brain tissue, plasma and urine by high-performance liquid chromatography with fluorescence detection.

A sensitive and selective method for the determination of the pyridinium metabolite (HPP+) derived from the antipsychotic drug haloperidol (HP) in brain tissue, plasma and urine using high-performance liquid chromatography with fluorescence detection is described. The HPP+ present in biological samples was extracted using a Sep-Pak C18 cartridge. Recoveries of HPP+ ranged from 78 to 90%. Final separation and quantitative estimations of HPP+ were achieved on a C18 reversed-phase column employing a mobile phase of acetonitrile-30 mM ammonium acetate (40:60, v/v) containing 10 mM triethylamine and adjusted to pH 3 with trifluoroacetic acid. The fluorescence detection utilized an excitation wavelength of 304 nm and an emission wavelength of 374 nm. Standard curves were linear in the range of 2.5-100 ng/ml for brain tissue homogenate and plasma samples and 10-500 ng/ml for urine samples. The detection limit of HPP+ was about 1 ng/ml in all biological samples. The concentrations of HPP+ in brain tissue, plasma and urine from HP-treated rats were determined using this method.     

反相高效液相色谱法测定肾复康胶囊中的野黄芩苷和芦丁

建立了肾复康胶囊中野黄芩苷和芦丁的反相高效液相色谱测定方法。以甲醇-水为提取溶剂,采用超声提取法对样品进行前处理。以0.02 mol/L磷酸二氢钾缓冲溶液(含1.0％（体积分数）冰醋酸)-甲醇（体积比为63∶37）为流动相,于330 nm波长下检测,肾复康提取液中野黄芩苷和芦丁可达基线分离,分析时间在20 min内。野黄芩苷和芦丁在10 ~300 mg/L内,其峰面积与浓度之间线性关系良好,目标物的加标回收率大于98％。该方法适用于肾复康胶囊及相关药材中野黄芩苷和芦丁黄酮类化合物的测定和质量控制。     

高效液相色谱法测定化妆品中的12种紫外吸收剂

建立了高效液相色谱同时测定化妆品中12种紫外吸收剂含量的方法。样品用甲醇提取,高速离心,过滤,以SB-C8柱(250 mm×4.6 mm, 5 μm)为分离色谱柱,甲醇和0.1%(v/v)甲酸水溶液为流动相,梯度洗脱,以311 nm为检测波长进行定性、定量分析。该方法前处理简单、易操作,12种紫外吸收剂分离效果良好;在1.0～500 mg/L范围内呈线性关系,相关系数大于0.9995;方法检出限为0.002～0.1 mg/L;实际样品中的加标回收率为97.4%～107.5%,相对标准偏差为1.54%～4.98%。该方法简便、准确,能够满足化妆品中紫外吸收剂的检测要求。     

Validation and pharmacokinetic application of a method for determination of doxazosin in human plasma by high-performance liquid chromatography

A simple high-performance liquid chromatographic method for the determination of doxazosin in human plasma was developed and validated. Prazosin was used as internal standard. After extraction twice with ethyl acetate, chromatographic separation of doxazosin in human plasma was carried out using a reversed-phase Apollo C18 column (250 x 4.6 mm, 5 microm) with mobile phase of methanol-acetonitrile-0.04 m disodium hydrogen orthophosphate (22:22:56, v/v/v) adjusted to pH 4.9 with 0.9 m phosphoric acid and quantified by fluorescence detection operated with an excitation wavelength of 246 nm and an emission wavelength of 389 nm. The lower limit of quantification (LLOQ) of this assay was 1 ng/mL using 500 microL human plasma. Linearity was established over the range 1-25 ng/mL (r2 > 0.9994). The intra- and inter-day accuracy ranged from 90.5 to 104.4% and the coefficient of variation were not more than 8.6% for both intra- and inter-day precision, over the range of the calibration curve. The absolute recoveries of doxazosin and prazosin from human plasma were more than 91%. Doxazosin demonstrated acceptable short-term, long-term and freeze-thaw stability in human plasma. The assay has been successfully applied to plasma sample ana-lysis for pharmacokinetic study.     

Simultaneous determination of hydroxyanthraquinones in rhubarb and experimental animal bodies by high-performance liquid chromatography.

A simple and reliable high-performance liquid chromatographic (HPLC) method was developed for the simultaneous determination of five hydroxyanthraquinones (aloe-emodin, rhein, emodin, chrysophanol, and physcion) in Rhubarb and experimental animal bodies. A Zorbax SB-C18 column (250 mm x 4.6 mm i.d., 5 microm) and a methanol-0.5% acetic acid (85:15, v/v) mobile phase were used for the separation. The detection wavelength of a diode array detector (DAD) was set at 254 nm. Regression equations revealed a linear relationship (R2>0.9996) between the mass of hydroxyanthraquinones injected and the peak areas detected by DAD. The detection limits (S/N=3) ranged from 0.35 ng to 3.13 ng, and the recoveries ranged from 83% to 103% for different hydroxyanthraquinones. This method is simple, sensitive and suitable for the analysis of hydroxyanthraquinones in medicinal materials and pharmacological experiment samples.     

反相高效液相色谱法测定植物组织培养基中的外源激素

建立了高效液相色谱-光电二极管阵列检测器测定植物组织培养基中6种外源激素的分析方法。采用Waters公司μBondaPak C18柱(3.9 mm×300 mm, 10 μm),用140 mmol/L乙酸钠-三乙胺缓冲液(pH 4.95)和乙腈作流动相,以75:25的比例等度洗脱,柱温37 ℃,流速1.0 mL/min,在波长285 nm下检测。在9 min内6种激素均达到基线分离,其进样量在4~200 ng之间具有良好的相关性(r2>0.9995)。培养基中的激素在减压烘干后用甲醇提取,各种激素的回收率均在85%以上。该方法可以用于植物组织培养基中外源激素的分析检测,或对培养基中未知激素的比例和种类进行分析测定。