Determination of Benzo[a]pyrene in Edible Oil by High Performance Liquid Chromatography-Fluorescence Detector (HPLC-FL)

In this study, an optimized high performance liquid chromatography-fluorescence detector (HPLC-FL) method for the determination of benzo[a]pyrene in edible oil was established. HPLC was performed with Thermo Fisher Scientific C18 column (250 mm×4.6 mm, 5 μm) as the chromatographic column and acetonitrile and water as the mobile phase, and the excitation wavelength and emission wavelength of fluorescence detector were 286 and 430 nm, respectively. The response was high, and the linear range was 0.5-10.0 ng/ml. The lowest limit of detection was 0.11 ng/ml, and the average recovery was 92.5%. This method is suitable for quantitative analysis of benzo[a]pyrene content in edible oil.

Rapid Determination of Dopamine and Its Metabolites During in vivo Cerebral Microdialysis by Routine High Performance Liquid Chromatography With Electrochemical Detection

To determine dopamine and its metabolites during in vivo cerebral microdialysis by routine high performance liquid chromatography with electrochemical detection. Methods Microdialysis probes were placed into the right striatum of Wistar rat brains and perfused with Ringer＇s solution at a rate of 1.5 pL/min. A reverse phase HPLC with electrochemistry was used to assay DA, DOPAC, and HVA after cerebral microdialysates were collected every 20 minutes from awake and freely moving rats. In order to identify the reliability of this method, its selectivity, linear range, precision and accuracy were tested and the contents of DA, DOPAC, and HVA in rat microdialysates were determined. Results The standard curve was in good linear at the concentration ranging from 74 nmol/L to 1.5 pmol/L for DOPAC （r^2= 0.9996）, from 66 nmol/L to 1.3 gmol/L for DA （r^2=l.0000） and from 69 nmol/L to 1.4 pmol/L for HVA （r^2=0.9992）. The recovery of DOPAC （0.30, 0.77, 1.49 gmol/L）, DA （0,26, 0.69, 1.32 gmol/L）, and HVA （0.27, 0.71, 1.37 gmol/L） was 82.00±1.70%, 104.00±4.00%, 98.70±3.10%; 92.30± 1.50%, 105.30±2.30%, 108.00±2.00%; 80.00±7.80%, 107.69±8.00%, and 108.66±3.10%, respectively at each concentration. Their intra-day RSD was 3.3%, 3.4%, and 2.5%, and inter-day RSD was 4.2%, 2.3%, and 5.6%, respectively. The mean extracellular concentrations of DOPAC, DA, and HVA in rat brain microdialysates were 10.7, 2.4, and 9.2 gmol/L （n=6）, respectively. Conclusion The findings of our study suggested that the simple, accurate and stable method can be applied to basic researches of diseases related to monoamines neurotransmitters by cerebral microdialysis in rats.

Trace Determination of Tamoxifen in Biological Fluids Using Hollow Fiber Liquid-Phase Microextraction Followed by High-Performance Liquid Chromatography-Ultraviolet Detection

The applicability of hollow fiber liquid-phase microextraction (HF-LPME) combined with high-performance liquid chromatography-ultraviolet detection (HPLC-UV) was evaluated for the extraction and determination of tamoxifen (TAM) in biological fluids including human urine and plasma. The drug was extracted from a 15 mL aqueous sample (source phase;SP) into an organic phase impregnated in the pores of the hollow fiber (membrane phase;MP) followed by the back-extraction into a second aqueous solution (receiving phase;RP) located in the lumen of the hollow fiber. The effects of several factors such as the nature of organic solvent, compositions of SP and RP solutions, extraction time, ionic strength and stirring rate on the extraction efficiency were examined and optimized. An enrichment factor of 360 along with substantial sample clean up was obtained under the optimized conditions. The calibration curve showed linearity in the range of 1 - 500 ng?mL–1 and the limit of detection was found to be 0.5 ng?mL–1 in aqueous medium. A reasonable relative recovery (≥89%) and satisfactory intra-assay (3.7% - 4.2%, n = 3) and inter-assay (7.5% - 7.8%, n = 3) precision illustrated good performance of the analytical procedure in spiked human urine and plasma samples.

Novel method for the determination of five carbamate pesticides in water samples by dispersive liquid-liquid microextraction combined with high performance liquid chromatography

A novel method for the determination of five carbamate pesticides （metolcarb, carbofuran, carbaryl, isoprocard and diethofencard） in water samples was developed by dispersive liquid-liquid microextraction （DLLME） coupled with high performance liquid chromatography-diode array detector （HPLC-DAD）. Some experimental parameters that influence the extraction efficiency were studied and optimized to obtain the best extraction results. Under the optimum conditions for the method, the calibration curve was linear in the concentration range from 5 to 1000 ng mL^-1 for all the five carbamate pesticides, with the correlation coefficients （r^2） varying from 0.9984 to 0.9994. Good enrichment factors were achieved ranging from 80 to 177- fold, depending on the compound. The limits of detection （LODs） （S/N = 3） were ranged from 0.1 to 0.5 ng mL^-1. The method has been successfully applied to the analysis of the pesticide residues in environmental water samples.

高效液相色谱-氢化物发生-原子荧光光谱法测定富硒大豆中硒代氨基酸的含量

取0.1 g脱脂后富硒大豆样品于离心管中,用5 mL pH 7.5的130 mmol·L^(-1)三(羟甲基)氨基甲烷-盐酸缓冲液超声振荡30 min,用15 mg链霉蛋白酶于37℃振荡酶解5 h,离心后取上清液,过0.22μm尼龙有机滤膜。滤液中的硒代半胱氨酸(SeCys)、硒代蛋氨酸(SeMet)、甲基硒代半胱氨酸(MeSeCys)在Agela MP-C_(18)色谱柱上分离,以含2%(体积分数)甲醇和0.5 mmol·L^(-1)四丁基溴化铵的40 mmol·L^(-1)磷酸氢二铵溶液(pH 7.0)进行等度洗脱,并采用氢化物发生-原子荧光光谱法测定3种硒代氨基酸的含量。结果表明,3种硒代氨基酸在7 min内可以实现基线分离,标准曲线的线性范围均为5~100μg·L^(-1),检出限依次为0.086,0.075,0.047 mg·kg^(-1)。按照标准加入法进行回收试验,回收率为85.5%~103%,测定值的相对标准偏差(n=7)不大于3.0%。方法用于分析富硒大豆中的硒代氨基酸,大豆中硒赋存形态多为SeMet,含量占总硒量的85.5%~94.5%。

丹磺酰肼衍生-高效液相色谱-荧光检测器法测定水中痕量3-羟基丙醛

提出了丹磺酰肼衍生-高效液相色谱-荧光检测器法测定水中痕量3-羟基丙醛(3-HPA)的方法。将1.0 g水样、2.0 mL含200 mg·L^(-1)丹磺酰肼的乙腈溶液、1.0 mL 3.0%(体积分数)乙酸溶液混合,再用乙腈定容至50 mL,于40℃衍生反应30 min。以Agilent Eclipse Plus C_(18)色谱柱为固定相,以不同体积比的乙腈-0.10%(质量分数)七氟丁酸溶液的混合溶液为流动相进行梯度洗脱,采用荧光检测器测定。结果表明:衍生试剂丹磺酰肼与3-HPA衍生物在20 min内可实现基线分离;3-HPA的质量浓度在7.6~380.0μg·L^(-1)内与衍生物的峰面积呈线性关系,检出限(3S/N)为1.1μg·L^(-1);方法用于实际水样分析,测定值的相对标准偏差(n=6)为0.71%,3-HPA的加标回收率为98.0%~102%。

高效液相荧光色谱法同时测定六神曲中黄曲霉毒素、玉米赤霉烯酮和赭曲霉毒素A

目的建立一种用免疫亲和柱净化-柱后光化学衍生-高效液相色谱同时检测六神曲中黄曲霉毒素、玉米赤霉烯酮和赭曲霉毒素A的方法。方法样品采用60%乙腈超声提取,免疫亲和柱净化,采用XBridge^(®)Phenyl苯基色谱柱(4.6 mm×250 mm,5μm),以乙腈和0.1%磷酸溶液为流动相,梯度洗脱,光化学衍生仪衍生,通过切换荧光波长检测。结果黄曲霉毒素、玉米赤霉烯酮和赭曲霉毒素A标准曲线的线性范围分别为0.006~0.108、0.500~2.500和0.202~1.009 ng,6种毒素的线性关系在0.9994以上,检出限分别为1.2、100.0和40.3 ng/ml,平均加标回收率为73.2%~92.3%,相对偏差为2.1%~5.4%。结论该方法具有专属性强、操作方便等特点,能够有效用于六神曲中3种毒素的同时检测和安全质量控制。

溶剂提取-高效液相色谱法测定大气颗粒物中18种多环芳烃

建立大气颗粒物PM2.5中18种多环芳烃的样品快速溶剂提取结合高效液相色谱的测定方法。将1/2玻璃滤膜剪碎后加入2.0 mL乙腈,于20℃水浴超声提取30 min,提取液经0.22μm有机相滤膜过滤,多环芳烃C18专用柱分离,以乙腈-水作为流动相进行梯度洗脱,采用紫外串联荧光检测器-高效液相色谱仪检测,以色谱峰面积外标法定量。18种PAHs的质量浓度在0.01~0.50μg/mL范围内与色谱峰面积线性关系良好,相关系数不小于0.999,检出限为0.03~0.47 ng/m^(3),样品加标平均回收率为75.6%~114.7%,相对标准偏差为0.09%~3.78%(n=7)。该方法简便、快速、准确、灵敏,可应用于大气颗粒物PM2.5中18种多环芳烃的测定。

UPLC-MS/MS法检测3种食品中松仁过敏原

基于食品基质中松仁过敏原Pin k 2建立了一种超高效液相色谱-串联质谱法。将松仁经过研磨、脱脂、浸提、酶解后经Easy-nLC 1000-QExactive高分辨质谱仪进行分离分析,结合Uniprot蛋白数据库以及ProteinPilotTM软件对质谱图进行数据处理,经BLAST验证特异性,最终筛选3条松仁特异性肽段。方法学验证结果表明,方法在0.001~50mg/mL范围内线性关系良好,定量限为1mg/kg;在饼干、巧克力和饮料3种空白基质中的平均回收率为88.50%~107.57%,相对标准偏差不高于6.08%,基质效应为89.77%~96.13%。该方法具有灵敏度高、特异性好的优势,可应用于饼干、巧克力、饮料等食品样品中松仁过敏原的检测,为我国食品标签真实性检验及食品中隐性过敏原的检测提供技术支持。

高效液相色谱及其串联质谱技术在牙膏风险物质分析中的应用

牙膏是日常生活中必不可少的口腔清洁护理用品,牙膏的基料较为复杂,牙膏中潜在的风险物质对人体存在一定危害,因此牙膏产品的安全性已成为当今社会关注的焦点之一。利用现代先进的检验检测技术对牙膏中潜在的风险物质进行分析、研究,将有利于实现对牙膏产品的安全监管,本文综述了近几年来高效液相色谱及其串联质谱技术在牙膏产品检验标准和检验方法开发等方面的研究以及应用进展,一定程度上能为牙膏产品的质量控制和科学监管提供参考。

Determination of Amantadine Residue in Honey by Solid-phase Extraction and High-performance Liquid Chromatography with Pre-column Derivatization and Fluorometric Detection

Amantadine （AMA） is an anti-viral drug used in apiculture to protect honeybee against the sacbrood virus （Morator aetatulae）. This study described a reliable high-performance liquid chromatographic （HPLC） method for analyzing AMA in honey using a solid-phase extraction （SPE） cartridge （Plexa PCX） for purification, 4-fluoro-7- nitro-2,1,3-benzoxadiazole （NBD-F） as a pre-column derivatization agent, and fluorometric detection （λex =470 nm, λem=530 nm）. The chromatographic separation was performed on an XDB C18 column （150×4.6 mm i.d.） using 0.1% trifluoroacetic acid/acetonitrile （35 ; 65, V/V） as the mobile phase at a flow rate of 1.0 mLomin 1 with a run time of 20 min. Under these optimal conditions, a linear relationship was observed in the range of 0.025--1.0μg·mL-1 with a good correlation coefficient （0.998） and low limit of detection （0.0080 μg·g-1）, the recoveries were all above 90%, and the intra-day and inter-day precision （RSD） ranged from 3.4%--5.1%.

Separation and identification of moxifloxacin impurities in drug substance by high-performance liquid chromatography coupled with ultraviolet detection and Fourier transform ion cyclotron resonance mass spectrometry

In this paper, a high-performance liquid chromatography coupled with ultraviolet detection and Fourier transform-ion cyclotron resonance mass spectrometry （HPLC-UV/FrICRMS） method was described for the investigation of impurity profile in moxifloxacin （MOX） drug substance and chemical reference substance. Ten impurities were detected by HPLC-UV, while eight impurities were identified by using the high accurate molecular mass combined with multiple-stage mass spectrometric data and fragmentation rules. In addition, to our knowledge, five impurities were founded for the first time in MOX drug substance.

九蒸九制对鸡头黄精理化性质及抗氧化性的影响

为了探究蒸制处理对鸡头黄精有效成分及代谢物种类和含量影响,采用低场核磁、苯酚-浓硫酸法、高效液相色谱-蒸发光散射检测法(HPLC-ELSD)和液相色谱-质谱技术(LC-MS)等对其中的水分分布、多糖含量、单糖组成和代谢产物等进行分析。结果表明,多次蒸制后,鸡头黄精结合水的含量、多糖含量逐渐降低,水提液pH值逐渐降低呈弱酸性达到4.07,还原糖、总酚、黄酮含量逐渐升高分别达到28.69%、10.02 mg/g和0.69%,抗氧化性逐渐增强,ABTS抗氧化能力在7制达到最高为0.73 mmol/L,较1制增加0.35 mmol/L,DPPH自由基清除率和FRAP值在8制达到最高分别为81.95%,1.97 mmol/L,较1制分别增加50.92%,1.72 mmol/L;同时蔗糖逐渐水解从18.53mg/g到7.62mg/g,葡萄糖和果糖含量提高,分别由1制0.00和11.30mg/g,达到9制17.25和230.89 mg/g。选取一制与九制黄精进行代谢物差异分析,在正离子模式下共检测到1310种代谢物,差异代谢物有176种(按其特性分为38类),在负离子模式下共检测到1841种代谢物,差异代谢物有148种(按其特性分为26类)。黄精经蒸制后有效成分差异性显著,对鸡头黄精炮制加工提供科学依据。

酸奶中乙酰磺胺酸钾、苯甲酸、山梨酸和糖精钠的检测方法

[目的]建立使用高效液相色谱仪同时检测酸奶中的乙酰磺胺酸钾等4种食品添加剂的方法。[方法]酸奶样品经过蛋白沉淀剂沉淀蛋白后高速离心,经0.22μm微孔滤膜过滤后上机测定。仪器使用C18色谱柱,流动相采用甲醇与0.02 mol/L乙酸铵溶液(不需调节pH值),检测波长为227 nm。[结果]4种添加剂线性范围1.00~50.0 mg/L,相关系数均在0.999 9以上,回收率91.2%~104.8%。[结论]该方法操作简单、快速,可用于同时检测酸奶中的乙酰磺胺酸钾、苯甲酸、山梨酸和糖精钠4种食品添加剂。

高效液相色谱-紫外检测法同时测定类鼻疽患者血浆中亚胺培南、美罗培南和头孢他啶的浓度

目的建立一种快速、经济的高效液相色谱-紫外检测法(HPLC-UV),用于同时测定人血浆中亚胺培南、美罗培南和头孢他啶的药物浓度。方法采用Millipore 10KD超滤离心去蛋白,使用互为内标法,色谱柱为SunFire-C18柱(4.6 mm×250 mm,5µm);预柱为C18柱(4.0 mm×2.1 mm,5µm),流动相为0.1 mol·L^(-1)的3-(N-吗啡啉)丙磺酸(pH=7.0)和乙腈,梯度洗脱,检测波长299nm,流速1.0mL·min^(-1),运行时间30min,进样体积30µL。结果亚胺培南、美罗培南和头孢他啶的保留时间分别为6.699 min、10.795 min和8.722 min。血浆内源性物质对样品的测定无干扰,峰形良好。该方法具有良好的线性、准确度和精密度。不同浓度的样品在–20℃反复冻融、–20℃长期冷冻和4℃(48 h)下均表现出了较高的稳定性。结论该方法操作成本低、专属性强、分离效果好,可用于类鼻疽患者血浆中亚胺培南、美罗培南和头孢他啶治疗药物浓度的测定。

高效液相色谱-串联质谱法同时测定饲料中乙氧基喹啉及其伴生物质

本研究旨在建立一种应用高效液相色谱-串联质谱(HPLC-MS/MS)技术同时测定饲料中乙氧基喹啉(EQ)、对氨基苯乙醚(PD)、非那西丁(PC)、乙氧基喹醌亚胺(EQI)和乙氧基喹啉二聚体(EQDM)含量的方法。饲料样品用乙腈提取,经BONDESIL-SI多重杂质吸附材料净化,采用HPLC-MS/MS测定,以0.1%甲酸水溶液-0.1%甲酸乙腈溶液作为流动相,梯度洗脱,Waters BEH C_(18)色谱柱分离。结果表明:通过饲料基质匹配绘制标准曲线,EQ、PD、PC、EQI和EQDM在5~500μg/L范围内线性关系良好[决定系数(R^(2))>0.9950]。方法中EQ、PD和PC的检出限和定量限分别为3.0和10.0μg/kg,EQI和EQDM的检出限和定量限分别为1.5和5.0μg/kg。EQ、PD、PC、EQI和EQDM在3个添加水平(20、50、100μg/kg)的平均回收率为73.77%~98.77%,批内相对标准偏差(RSD,n=6)<10%,批间变异系数<12%。该方法前处理简单,操作方便,适用于饲料中EQ及其伴生物质的同步测定。

纳米棒状MgO固相萃取结合高效液相色谱荧光法测定食用油中的苯并[a]芘

采用直接沉淀法合成了一种纳米棒状Mg O吸附剂,结合固相萃取-高效液相色谱荧光检测(SPE-HPLC/FLD)建立了食用油中苯并[a]芘(Ba P)的快速分析方法。采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、比表面积和孔径分析仪(BET)对合成的棒状Mg O进行了表征,结果表明Mg O纳米材料是多晶立方结构,呈棒状形貌,具有较大的比表面积,非常适合作为SPE的吸附剂。对SPE过程中吸附剂用量、清洗液种类、解吸液种类及用量、上样液体积进行了详细的优化。在优化的条件下,食用油中Ba P在0.5~20.0μg/kg浓度范围内,线性方程回归系数的平方(R^(2))为0.9999,以信噪比的3倍和10倍计算方法检出限和定量限分别为0.10μg/kg和0.33μg/kg。同时,Ba P在低、中、高3种加标浓度下回收率在85.3%~96.5%,日内日间相对标准偏差范围在2.3%~9.0%,表明本方法具有很好的准确度和精密度。最后,将该方法应用于8种实际油样中Ba P的分析,所有样品的回收率在77.8%~92.5%之间,相对标准偏差小于9.8%,表明该方法具有很好的适用性,在实际样品分析中具有很好的应用前景。

柱前荧光衍生化法检测降尘样品中的不饱和醛

本研究发展了一种柱前荧光衍生化方法,实现了重要环境污染物不饱和醛类化合物的高灵敏度、高选择性分析。该方法使用4-丁基羟氨-7-羟基香豆素(HAHC)作为荧光衍生试剂,结合高效液相色谱-荧光检测法(HPLC-FLD)实现了6种二烯醛的定性、定量分析。在实际样品分析中成功从积尘样品中检测出(E,E)-2,4-庚二烯醛、(E,E)-2,4-辛二烯醛、(E,E)-2,4-十一烷二烯醛。这种柱前衍生化法具有动态范围宽(2~2500nmol/L)、灵敏高(检出限为0.2nmol/L)、精密度好(日内相对标准偏差为2.17%~3.33%,日间相对标准偏差为2.28%~5.04%)等优点,且无需固相萃取等复杂前处理步骤,为痕量醛类污染物检测提供了有效手段。

荧光检测器高效液相色谱法测定樟脑丸中萘

建立高效液相色谱法测定樟脑丸中萘的含量。样品以甲醇为溶剂超声溶解,经0.22μm滤膜过滤后,以荧光检测器高效液相色谱法测定。荧光检测器激发、发射波长分别为290、330 nm,以甲醇为流动相,流量为1.0 mL/min,以Platisil ODS柱(250 mm×4.6 mm,5μm)色谱柱作为分析柱,柱温为25℃,进样体积为10μL,利用色谱峰面积外标法进行定量。该方法线性相关系数为0.9999,检出限为1.0×10^(-8)g/mL,样品加标回收率为98.4%~102.8%(n=6),测定结果的相对标准偏差为1.81%(n=6)。该方法可用于樟脑丸中萘的检测。

石香薷水提物HPLC特征图谱的研究

石香薷药材用于精油提取后的水提液中仍含有大量生物活性物质,具有开发为饲料添加剂的价值,从而实现石香薷资源的综合利用。采用HPLC法,按照优化后的色谱条件对24批石香薷水提取物样品的化学成分进行测定分析。建立了不同产地石香薷水提物的HPLC特征图谱,共确定8个特征峰,经对照品比对确定特征峰5、7、8分别为野黄芩苷、迷迭香酸和黄芩素-7-甲醚,设定迷迭香酸为参照峰(S峰),特征峰1~8的相对保留时间的规定值分别为0.176、0.444、0.495、0.676、0.765、0.954、1.000、1.618,精密度、重复性和稳定性考察中各特征峰相对保留时间的相对标准偏差(RSD)分别为0.03%~0.57%、0.01%~0.31%、0.04%~0.15%,相对峰面积的RSD分别为0.88%~2.60%、1.39%~3.33%、1.95%~4.54%。该研究建立的HPLC特征图谱具有良好的精密度、稳定性和重复性,为石香薷水提物作为饲料添加剂开发的质量控制提供了依据。