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.

Determination of AF and AFG in Red Ginseng by High Performance Liquid Chromatography with Evaporative Light Scattering Detector (HPLC-ELSD)

[Objective]The paper was to establish a method for determining AF and AFG in red ginseng.[Method]A new simple,rapid and sensitive method for simultaneous determination of two amadori compounds,arginyl-fructose(AF)and arginyl-fructosyl-glucose(AFG),in extracts of three kinds of ginseng preparations was developed and validated using high performance liquid chromatography with evaporative light scattering detector(HPLC-ELSD).Two target analytes were efficiently separated by Prevail CTM18 column(4.6 mm×250 mm,5μm)at the flow rate of 0.8 mL/min within 15 min of single chromatographic run.[Result]Under optimized conditions,the detection limits were 0.015 and 0.02 mg/mL for AF and AFG,respectively.Calibration curves of peak area for two analytes were linear over three orders of magnitude with the correlation coefficients greater than 0.999.The average recoveries,precision,reproducibility and stability for two analytes(AF and AFG)were 99.5% and 100.9%,0.43% and 0.47%,0.46% and 0.43%,0.41% and 0.49%,respectively.[Conclusion]This method was successfully applied for quantifying AF and AFG in red ginseng and the method was efficient,sensitive and accurate.

Quantification of six bioactive compounds in Zhenqi Fuzheng preparation by high-performance liquid chromatography coupled with diode array detector and evaporative light scattering detector

A simple and accurate high-performance liquid chromatography（HPLC）coupled with diode array detector（DAD）and evaporative light scattering detector（ELSD）was established for the determination of six bioactive compounds in Zhenqi Fuzheng preparation（ZFP）.The monitoring wavelengths were 254,275 and 328 nm.Under the optimum conditions,good separation was achieved,and the assay was fully validated in respect of precision,repeatability and accuracy.The proposed method was successfully applied to quantify the six ingredients in 31 batches of ZFP samples and evaluate the variation by hierarchical cluster analysis（HCA）,which demonstrated significant variations on the content of these compounds in the samples from different manufacturers with different preparation procedures.The developed HPLC method can be used as a valid analytical method to evaluate the intrinsic quality of this preparation.

Research Advances in Detection Techniques of High Performance Liquid Chromatography-Refractive Index Detector

As a highly sensitive and stable detector,refractive index detector is usually used for quantitative detection of substances such as polymer,sugar and organic acid. The research reviewed the application of HPLC-RID in the fields of quantitative determination of medicine and food,in order to lay a foundation for wider use of RID.

Simultaneous Determination of Saponins in Radix Glycyrrhizae, Notoginseng and Ginseng by High Performance Liquid Chromatography

To establish a method for determining five saponins(notoginsenoside R1, ginsenoside Rg1, ginsenoside Re, ginsenoside Rb1 and ammonium glycyrrhizinate) in Glycyrrhizae, Notoginseng and Ginseng, the high performance liquid chromatography with diode array detector(HPLC-DAD) method was applied to an Inertsil ODS-SP column(4.6 mm×250 mm, 5 μm) with a mobile phase consisting of acetonitrile-0.05% phosphoric acid in a gradient elution manner. The flow rate was 1.0 mL/min. The column temperature was 30 ℃ and the detection wavelengths were 203 nm and 237 nm, respectively. The linear ranges were 0.700,0—7.000,0 μg for R1(r=1.000,0), 0.751,1— 7.511,4 μg for Rg1(r=1.000,0), 0.677,2—6.771,6 μg for Re(r=1.000,0), 0.733,9—7.339,1 μg for Rb1(r= 1.000,0), and 0.540,0—5.399,8 μg for ammonium glycyrrhizinate(r=0.999,9), respectively. In addition, their average recoveries were 100.28%, 105.83%, 104.09%, 99.36% and 98.54%, respectively. The relative standard deviations(RSDs) of precision, reproducibility and recovery were all less than 1.5%. The results indicate that the method is simple, accurate and reproducible so that it can be used for the simultaneous determination of the five saponins in Chinese patent medicines containing the three kinds of herbs.

Stress Degradation Studies on Lisinopril Dihydrate Using Modified Reverse Phase High Performance Liquid Chromatography

A simple, precise, accurate and sensitive reverse phase high performance liquid chromatographic method for simultaneous estimation of lisinopril dihydrate and its degradation products occuring under different ICH prescribed stress conditions has been modified. Drug was resolved on a C18 column, utilizing modified mobile phase of tetra butyl ammonium hydroxide solution and acetonitrile. Ultra violet detection was carried out at 210 nm. The method was modified with respect to linearity, precision, accuracy, selectivity, specificity and ruggedness. The results obtained revealed that lisinopril dihydrate was an active product slightly changed under stress conditions.

Fast determination of tobramycin by reversed-phase ion-pair high performance liquid chromatography with a refractive index detector

A simple and direct method without a deriva- tion step for routine analysis of tobramycin has been developed. This method used reversed-phase ion-pair high performance liquid chromatography （HPLC） with a refractive index （RI） detector and a C18 column which is stable at pH above 1.00. The presence of 4.50mg.mL ] trifluoroacetic acid （TFA） in the mobile phase improved the protonation of tobramycin and the formation of ionpairs, and thus reduced its hydrophility. This unique separation-detection combination showed good linearity with correlation coefficients 0.9996 in the concentration range of 0.25-2.50mg.mL 1. The quantitation limit and detection limit were determined to be 0.23 mg.mL ~ and 0.071 mg. mL ~, respectively. Tobramycin was recovered in 98.00%, 98.84% and 99.64% for tobramycin solutions at concentrations of 2.25 mg.mL^-1, 1.50mg.mL 1 and 0.75 mg.mL ＇, respectively. The relative standard deviations for six spiked samples ranged from 0.20% to 2.40%, indicating a good reproducibility of this method.

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.

Phytochemical Analysis of Ziziphus jujuba Leaves in Six Cultivars at the Whole Life Stage by High Performance Liquid Chromatography

Leaves of Ziziphus jujuba Mill.（Z. jujuba） were used as a folk medicine to treat children suffering from typhoid fever, furuncle and ecthyma in China. The present study was to establish a high performance liquid chroma- tography-diode array detector（HPLC-DAD） method for quality control of Z. jujuba leaves. The validated method was applied to the simultaneous characterization and quantification of sixteen main constituents in thirty samples, which comprised the whole life stage of Z. ]ujuba leaves from six cultivars in Yulin, Shannxi Province, China. HPLC fin- gerprint file of Z. jujuba leaves was set up and the results indicate that the major constituents of Z. jujuba leaves are （-）-catechin（1）, quercetin-3-O-robinobioside（3）, rutin（4） and quercetin-3-O-a-L-arabinosyl-（1---~2）-a-L-rhamnoside（6） with the total contents of the nine flavonoids in respective batch ranging from 18.52 mg/g to 39.51 mg/g. In addition, the contents of compounds depend on both the season and the cultivar. During ripening of Z. jujuba leaves, flavo- noids of all the cultivars present a similar trend： initially decrease from 25th, Jun. to 5th, Aug., 2015, and then in- crease for a period of time, finally slightly fluctuate on 5th Oct. The highest contents of total flavonoids were regis- tered on 25th Jun., 2015. Different cultivars have 50%--90% variation on the content for the three classes of com- pounds. Taken together, the results demonstrate that Z. jujuba leaves have great potential to be a new health-promoting resource based on flavonoids and the best sampling time of them is in June.

HPLC-UV测定人血浆瑞芬太尼浓度

目的建立高效液相色谱-紫外检测法测定人血浆瑞芬太尼浓度。方法人血浆经甲醇沉淀蛋白后先用氯丁烷萃取,再将药物提取至0.01mol·L-1盐酸中。以HypersilCN(4.6mm×250mm,5μm)为固定相;0.02mol·L-1NaH2PO4水溶液-乙腈(70:30),内含三乙胺0.01%为流动相,流速1.5mL·min-1,紫外检测波长为210nm。结果标准曲线在1.0-100ng·mL-1内线性关系良好(r=0.9984)。3种不同浓度平均方法回收率为(113.18±12.26)%,提取回收率为(87.90±3.21)%,日内RSD和日间RSD分别小于10%,15%。结论本方法准确、灵敏、专一性好,适用于临床瑞芬太尼血药浓度检测和药动学研究。

HPLC-UV对人组织激态释放酶的测定方法研究

HPLC-UV结合的方法是一种灵敏度高、分辨率高的分离检测方法。本文利用HPLC-UV测定了人组织激肽释放酶的最大吸收波长,结果表明人组织激肽释放酶在200nm具有最大紫外吸收;并对昆虫细胞培养液中的人组织激肽释放酶进行定性检测,具有灵敏度高,所用的分析时间短等特点。

UV和HPLC法测定地锦草不同部位中总黄酮和槲皮素的含量

采用紫外分光光度法(UV)测定地锦草不同部位中总黄酮的含量;采用高效液相色谱法(HPLC)测定地锦草不同部位中槲皮素的含量.结果表明,总黄酮在2.0～16.0μg(R=0.999)时线性关系良好,平均回收率为102.2%;HPLC法测槲皮素在0.584～29.190μg(R=0.999)时线性关系良好,平均回收率为99.6%.地锦草不同部位中总黄酮和槲皮素含量由高到低依次为叶、全草、种子、茎、根,其中叶的总黄酮和槲皮素含量分别为43.25mg/g和17.86mg/g.

HPLC-UV法检测微生物降解体系中西维因含量

采用高效液相色谱-紫外检测（HPLC-UV）法测定微生物降解体系中西维因含量。根据细菌和霉菌降解体系的不同性质选用适宜前处理方式,以Sepax GP-C_（18）柱（150 mm×4.6 mm,5.0μm）为色谱柱,V（乙腈）∶V（水）=（56∶44）为流动相,流速0.5 m L/min,用紫外检测器于220 nm处检测西维因。结果表明,西维因标准品保留时间为7.922 min,在0.5~100 mg/L范围内线性关系良好,相关系数0.999 1。细菌培养液中西维因平均回收率为102.01%,RSD为0.29%;霉菌培养液中平均回收率为100.76%,RSD为1.22%;最低检测限为0.4mg/L。运用该法测得实验室保藏的细菌菌株A4和B-1在LB培养基中培养2 d对20 mg/L西维因降解率分别为35.72%、38.97%;霉菌菌株M-4和YAT在MM培养基中培养7 d对20 mg/L西维因降解率分别为38.69%、51.40%。该法简单,快速,回收率和精密度高,稳定性好。

HPLC-UV-ELSD联用常温分析检测六味地黄丸成分

通过串联色谱柱的操作方式以增加柱效,采用紫外检测器(UV)联用蒸发光散射检测器(ELSD)的检测方式以提高可识别的峰数目,构建了分离效率高、峰容量大及可采用高黏度溶剂为流动相的HPLC系统。采用常温操作,对六味地黄丸的有效成分进行了分析。

基于共价有机骨架-MSPE-HPLC-UV法测定多环芳烃

通过一种简易的方法制备磁性共价有机骨架材料(Fe3O4@COF-SCU1),用于磁性固相萃取(MSPE)大红袍茶汤中8种多环芳烃,并结合高效液相色谱-紫外(HPLC-UV)法对其进行定性定量分析。采用电子扫描显微镜、电子透射显微镜、X射线衍射、氮气等温吸附脱附、傅立叶变换红外光谱对Fe3O4@COF-SCU1进行表征。试验系统优化了Fe3O4@COF-SCU1组成、MSPE的吸附及洗脱条件,并建立多环芳烃的定性定量分析方法。在最佳操作条件下,8种多环芳烃均得到良好的线性关系,相关系数≥0.998 7。方法的检出限(LODs,S/N=3)和定量限(LOQs,S/N=10)分别为0.10~0.40,0.33~1.34ng/mL。用该方法对大红袍茶汤进行分析,加标回收率为74%~106%,相对标准偏差RSD为1.20%~8.50%。结果表明,Fe3O4@COF-SCU1可以简便快速地萃取分离痕量水平的多环芳烃。

高效液相色谱法测定小鼠血浆中苯并三唑类紫外线吸收剂UV-327和UV-328

目的:建立小鼠血浆中苯并三唑类紫外线(ultraviolet,UV)吸收剂UV-327和UV-328的高效液相色谱测定方法。方法:在小鼠血浆中加入正己烷-丙酮溶液(体积比1∶1)涡旋混匀提取,上清液于50℃下氮气吹干,残渣用甲醇溶解后离心过滤,采用高效液相色谱-紫外检测器测定小鼠血浆中UV-327和UV-328的浓度。分析柱为Waters Symmetry?C18柱(250 mm×4.6 mm,5μm),流动相为100%甲醇,等度洗脱,流速1.0 mL/min,紫外检测波长为340 nm,以UV-320为内标,保留时间定性,内标法定量。结果:UV-327、UV-328在0.05~10.0 mg/L范围内呈现良好的线性关系(r=0.9997),检出限为0.01 mg/L,定量限为0.03 mg/L。小鼠血浆中,低、中、高3种浓度(0.50、1.00、2.00 mg/L)UV-327和UV-328的平均回收率分别为91.7%~101.0%和97.5%~103.9%,日内精密度(n=6)分别为2.9%~6.6%和2.7%~7.4%,日间精密度(n=3)分别为6.0%~9.3%和6.6%~8.6%,提取回收率分别为98.8%~103.8%和99.8%~100.9%。血浆样品室温下放置6 h和-40℃放置15 d,UV-327测定值的相对偏差分别为0.9%~3.5%和7.4%~15.0%,UV-328测定值的相对偏差分别为2.0%~4.3%和2.1%~13.8%。3种加标浓度的小鼠血浆样品室温下至少可以放置6 h,-40℃冰箱中可以保存15 d。结论:高效液相色谱法简便、快速,准确度、精密度和灵敏度较高,可应用于小鼠血浆中UV-327和UV-328的分析测定。

Determination of Tea Saponin in Camellia Seed Oil with UV and HPLC Analysis

A simple procedure is described for the HPLC and UV determination of tea saponin in tea seed oil. Determinate was accomplished with UV wavelength detection 550 nm for saponification sample, and HPLC was done under conditions: C18 analytical column of TC-C18, 4. 6 × 250 mm, column temperature at room temperature, injected sample volume was 10 μL, mobile phase’s methanol, flow-rate 0.8 ml/min and detection wavelength 280 nm.

Study on chromatographic fingerprint of sarcandra glabra (Thunb.) by microwave-assisted extraction coupled to HPLC/DAD

Microwave-assisted extraction(MAE)was used for extraction of effective components of sarcandra glabra(Thunb.),and then chromatographic fingerprint of sarcandra glabra(Thunb.)was studied by high performance liquid chromatography/diode array detector(HPLC/DAD).The conditions of MAE were optimized by an orthogonal experiment,and then the authentication and validation of the chromatographic fingerprint were conducted.Nine peaks were identified as common peaks in the fingerprint chromatograms,and isofraxidin was considered as a reference compound and quantified.Relative standard deviations of retention time and peak area of each component were less than 3% and 8%,respectively.Similarity and difference analysis were conducted by use of PCA and relation coefficient.Twenty batches of sarcandra glabra(Thunb.)samples from two different producing areas could be classified into two different groups in the PCA model.The results showed that MAE-HPLC/DAD method was simple,efficient and stable for the study of complex chromatographic fingerprint of sarcandra glabra(Thunb.),which could provide more reliable and precise information for quality evaluation.

HPLC Analysis of Egg Yolk Phosphatidylcholine by Evaporative Light Scattering Detector

Egg yolk phosphatidylcholine(EYPC) is being widely used in food and pharmaceutical industries nowadays owing to its surface activity,pharmaceutical usefulness,and so on.Common determination methods of phospholipids were based on the American Oil Chemists' Society(AOCS) Official Method Ja7b-91,in which n-hexane/2-propanol/acetate buffer was used as the mobile phase.In order to achieve desired results,gradient elu-tion or buffer solution was used,which made the detection process more complicated.Moreover,water or buffer solution could affect the silica gel column both on its lifespan and the separation efficiency significantly.In this study,different mobile phase and detector were used to simplify EYPC analyzing process instead of using water within the mobile phase.The optimized HPLC operating conditions are as follows:pure methanol as a mobile phase,flow rate of 1.0 ml·min-1,silica gel column(250 mm×4.6 mm,5 μm,Inertsil GLTM),column temperature 30 ℃ and low temperature evaporative light scattering detector(40 ℃,0.35 MPa) as used.Under this optimal condition,the linear relative coefficient of the standard curve is 0.998 and the recovery was in the range of 96.83%-101.58% with a relative standard deviation of 1.79%(n=6).

HPLC法测定UV固化涂料中光引发剂含量

建立了高效液相色谱法测定UV固化涂料中光引发剂的组分及其含量的方法。样品经定容过滤后进行色谱分析,采用的色谱条件:色谱柱NUCLEODUR C18 Isis 250mm×4.6mm,5μm;流动相:A液为乙腈,B液为超纯水;流速1.0mL/min,柱温25℃,UV检测器。采用该方法测定二苯甲酮、TPO、光引发剂1173、光引发剂819、苯甲酰甲酸甲酯5种组分的回收率均高于99.98%,相对标准偏差(n=7)小于0.44%,线性相关系数R2大于0.9999。该方法已应用于UV固化涂料生产控制中。