固相微萃取-GC-MS法测定水中的三苯胂和二苯胂酸

建立了一种同时测定水中痕量三苯胂和二苯胂酸的方法,使用巯基乙酸甲酯作为二苯胂酸测定的衍生化试剂,固相微萃取耦合气相色谱-质谱法(选择离子监测)同时测定三苯胂和二苯胂酸。优化了萃取纤维丝、萃取时间、衍生化等操作条件。同时对混合物测定的回收率、相对标准偏差和最低检测限进行了研究。方法的回收率大于95%,最低检测质量浓度分别为0.0005和0.0003 mg/L,6次测定的相对标准偏差分别为5.3%、7.6%。     

SPME/GC-MS测定水中痕量二苯氯胂

采用衍生化固相微萃取/气相色谱-质谱(GC-MS),对水中痕量二苯氯胂进行测定,考察了衍生化试剂、萃取纤维、萃取时间等因素对方法灵敏度的影响。测定二苯氯胂的线性范围为1.8~216μg/L,检出限为0.3μg/L(S/N=3),相对标准偏差为7.63%,回收率为95%~103%。     

SPME/GC-MS测定水中痕量二苯氰胂的方法研究

采用衍生化固相微萃取-气相色谱-质谱(GC-MS)监测技术,对水中痕量二苯氰胂进行了测定,考察了衍生化试剂、萃取纤维、萃取时间等因素对方法灵敏度的影响.测定二苯氰胂的线性范围为2.14～137 μg/L,检出限为0.2 μg/L,相对标准偏差为10.4%,回收率为97%～102%.     

氨基化四氧化三铁磁性纳米粒子富集石墨炉原子吸收法检测苯胂酸

合成了磁性功能材料,氨基化的Fe3O4纳米粒子,以丙酮作溶剂对洛克沙胂、对氨基苯胂酸、对羟基苯胂酸、对硝基苯胂酸、对酰胺基苯胂酸进行吸附,石墨炉原子吸收光谱法进行检测。对合成的磁性材料进行了表征,并详细研究了其对苯胂酸的吸附性能。结果表明,合成的磁性材料对苯胂酸具有良好的选择性,5 min内便可吸附完全,吸附率接近100%。该方法在10～200 ng/mL范围内线性良好,检出限低于1 ng/mL,RSD均低于5.6%,将合成材料用于鸡饲料中5种苯胂酸的测定,加标回收率均在63%～104%之间。     

超高效液相色谱-串联质谱法测定饲料中氨苯胂酸和洛克沙胂

采用超高效液相色谱-串联质谱法测定饲料中氨苯胂酸和洛克沙胂的含量。粉碎过筛后的样品用乙腈(1+1)溶液超声提取30min,离心后,上清液用二氯甲烷净化,取水层(上层)过0.22μm水系滤膜。以Thermo HYPERCARB色谱柱为固定相,以不同体积比的0.05%(体积分数)甲酸溶液和乙腈混合液为流动相进行梯度洗脱,串联质谱分析中采用电喷雾负离子源和多反应监测模式。氨苯胂酸和洛克沙胂的质量浓度均在0.05～10.0mg·L~(-1)内与其对应的峰面积呈线性关系,检出限(3S/N)为0.01～0.05mg·kg~(-1)。以空白样品为基体进行加标回收试验,所得回收率为82.0%～106%,测定值的相对标准偏差(n=6)为1.0%～7.9%。     

塑料食品包装中对苯二酸向食品模拟物迁移的高效液相色谱测定方法

建立了高效液相色谱(HPLC)法测定塑料食品包装中对苯二酸(TA)向食品模拟物的迁移量.对前处理净化技术及色谱条件进行了优化,并利用超高效液相色谱-串联质联(UPLC-MS/MS)进行确证.该方法在0.3～30 mg/L范围内线性关系良好,检出限为0.3 mg/L.食品模拟物中对苯二酸的加标回收率在89.0%～110.0%之间,其相对标准偏差为0.45%～9.24%,重复性和再现性良好.利用该方法对实际塑料包装制品中对苯二酸进行了迁移测定.     

基于分子络合的分散液液微萃取与高效液相色谱联用检测环境水样中2种苯氧羧酸类除草剂

建立了基于分子络合的分散液液微萃取(DLLME)方法,以磷酸三丁酯为萃取剂,以甲醇为分散剂,与高效液相色谱联用检测了环境水样中麦草畏和2,4-二氯苯氧乙酸(2,4-D酸)2种苯氧羧酸类除草剂,对影响前处理效果的因素(包括水样的pH值、萃取剂的种类和体积、分散剂的种类和体积、反萃液的pH值、反萃液的体积和盐浓度等)进行了详细考察,在最佳萃取条件下(水样体积10 mL,水样的pH值为0~1.0、100μL磷酸三丁酯萃取剂、1 000μL甲醇分散剂、0.01 mol/L的氢氧化钾反萃液的体积为80μL),2种苯氧羧酸类除草剂在0.50~1 000μg/L范围内具有良好的线性,相关系数不小于0.998 5,麦草畏和2,4-D酸的检出限分别为0.44μg/L和0.49μg/L,富集倍数分别为85和90,在实际样品中的加标回收率为75.7%~104.0%。该方法基于分子络合反应机理,将新型萃取剂磷酸三丁酯应用于分散液液微萃取,与HPLC联用实现了麦草畏和2,4-D酸的富集与检测,为环境水样中苯氧羧酸类除草剂的检测提供了新的前处理方法。     

液相色谱-氢化物发生-原子荧光联用同时测定洛克沙胂及其代谢物

利用液相色谱-氢化物发生-原子荧光联用技术同时检测5种砷形态化合物(亚砷酸、砷酸、一甲基胂酸、二甲基胂酸和洛克沙胂).结果表明,在梯度洗脱条件下,以C18反相柱作分离柱,含0.5 mmol/L四丁基溴化铵的NaH2PO4-CH3OH溶液为流动相,5种砷化合物得以完全分离;以20 g/L K2S2O8为氧化剂进行紫外消解,7% HCl为载流,20 g/L KBH4为还原剂,砷化合物形成最佳的原子荧光信号.5种砷化合物在一定的浓度范围内与荧光峰面积呈良好的线性关系; 检出限＜10 μg/L; 加标回收率为81.4%～105.6%; 相对标准偏差RSD<4.0%.本方法适用于饲料、鸡粪、土壤和植物样品中洛克沙胂及其代谢物(亚砷酸、砷酸、一甲基胂酸和二甲基胂酸)的含量分析.     

3,4-二巯基甲苯衍生砷形态的气相色谱-质谱分析

建立了3,4-二巯基甲苯衍生路易氏剂和苯胂酸,辅之以气相色谱-质谱和气相色谱-原子发射光谱分析的方法。从优化衍生化反应的实验条件出发,研究了衍生剂用量、温度、酸度等几个因素的影响。并由GC-MS和GC-AED获得了路易氏剂和苯胂酸线性范围和检测限。将该法应用于加标水样的分析,回收率均在93.98%-110.26%,获得满意的结果。     

高效液相色谱法测定粗苯均四甲酸二酐中苯均四甲酸含量

将粗苯均四甲酸二酐(PMDA)样品与甲醇回流2 h,冷却后用甲醇将甲醇回流液稀释至100mL,分取20μL进样,用高效液相色谱法测定其中苯均四甲酸含量。采用的色谱柱为AgilentRP18柱(4.6mm×200 mm,10μm),流动相为磷酸(0.1+99.9)溶液与甲醇以体积比为80比20组成的混合溶液,流量为1.0mL·min~(-1),紫外检测波长为220 nm。在此条件下,粗苯均四甲酸二酐中共存的4种组分,苯均四甲酸二酐酯化产物、1,2,4-苯三甲酸酐、邻苯二甲酸、苯均四甲酸可得到有效分离。     

高效液相色谱法测定聚合物水处理剂中残留的单体

建立了采用高效液相色谱测定聚环氧琥珀酸钠盐(PESA)、丙烯酸/马来酸酐二元共聚物(AA/MA)、聚丙烯酸盐(PAA)、水解聚马来酸钠盐(HPMA)、马来酸酐/丙烯酸/丙烯酸甲酯三元共聚物(MA/AA/MAc)5类聚合物水处理剂中残留单体的方法。以Agilent ZORBAX 300SB-C18柱(5 μm,150 mm×4.6 mm)为分析柱,柱温为30 ℃,流动相为0.01 mol/L KH2PO4溶液(用5%H3PO4调节pH为2.3)-甲醇(体积比为95∶5)进行等度洗脱,检测波长为210 nm,流速为0.6 mL/min,样品用流动相稀释过滤后直接进样分析,10 min内马来酸、富马酸及丙烯酸残留单体获得分离和定量。上述3种残留单体的检出限分别为0.5,0.5和0.2 mg/L,回收率为98.9%～103.7%,相对标准偏差为1.09%～1.69%,相关系数为0.9996～0.9999。实验结果表明,该法简便快速、灵敏可靠,适用于5类聚合物水处理剂中残留单体的测定。     

Analysis of duloxetine hydrochloride and its related compounds in pharmaceutical dosage forms and in vitro dissolution studies by stability indicating UPLC

A reproducible gradient reversed-phase ultra-performance liquid chromatographic method is developed for quantitative determination of duloxetine hydrochloride in pharmaceutical dosage forms. The method is also applicable for analysis of related substances and for study of in vitro dissolution profiles. Chromatographic separation is achieved on a 50 mm × 4.6 mm, 1.8 μm C-18 column. Mobile phase A contains a mixture of 0.01 M KH(2)PO(4) (pH 4.0) buffer, tetrahydro furan, and methanol in the ratio 67:23:10 (v/v/v), respectively, and mobile phase B contains a mixture of 0.01 M KH(2)PO(4), (pH 4.0) buffer, and acetonitrile in the ratio 60:40 (v/v), respectively. The flow rate is 0.6 mL/min, and the detection wavelength is monitored at 236 nm. Resolution of duloxetine hydrochloride and three potential impurities is greater than 2.0 for all pairs of components. The drug was subjected to ICH prescribed hydrolytic, oxidative, photolytic, and thermal stress conditions. Method is validated for linearity, specificity, accuracy, precision, ruggedness, and robustness.     

青霉素裂解液的高效液相色谱分析

 利用高效液相色谱法分析测定青霉素裂解液中的主要成分 6 氨基青霉烷酸 (6 APA)、青霉素G钾和苯乙酸 ,并对副产物青霉噻唑酸进行了液相色谱的定性检测。结果表明 ,实验方法简便、快速 ,结果准确 ,可以用于 6 APA生产的质量控制。     

Validated stability-indicating HPLC-UV method for simultaneous determination of glipizide and four impurities

A selective stability-indicating HPLC-UV method for simultaneous determination of glipizide and four impurities (DPs I-IV) formed under hydrolytic conditions was developed and validated. The drug and impurities were resolved on an XTerra C18 column (250 x 4.5 mm id) in a single gradient run using buffer (0.005 M KH2PO4; pH 3.0)-methanol (60 + 40, v/v; mobile phase A) and (20 + 80, v/v; mobile phase B) at a flow rate of 0.5 mL/min with 230 nm detection wavelength. The method was linear across concentration ranges of 0.2-100, 0.1-100, 0.5-100, 0.2-100, and 0.1-50 microg/mL for glipizide and DPs I-IV, respectively. The RSD for intraday and interday precision for the drug and impurities was < 1 and < 1.2%, respectively. Satisfactory recoveries (96.58-99.97%) of each of the three concentrations selected across the linearity range of each analyte were obtained, proving the method was sufficiently accurate. The LOD was 0.07, 0.05, 0.16, 0.08, and 0.05 microg/mL and the LOQ was 0.20, 0.14, 0.50, 0.23, and 0.14 microg/mL for the drug and DPs I-IV, respectively. Each peak was resolved with resolution of > 2 from the nearest peak. Insignificant changes in retention time (< 4%) and calculated amount (< 1.65%) of drug and each impurity upon small but deliberate changes in various chromatographic parameters were observed, suggesting the method was robust. The method was applied successfully to stability testing of glipizide tablets.     

New HPLC method to detect individual opioids (heroin and tramadol) and their metabolites in the blood of rats on combination treatment

Drug abuse is both an age-old and a constantly evolving problem in society. Trends in illicit drug use are highly fluid, with new formulations increasing in popularity. For this reason, methods for illicit drug detection and analysis need to be continually updated so they remain useful and relevant. A recent trend in street heroin production has seen it diluted with large amounts of tramadol in addition to the classical diluents such as acetaminophen and caffeine. This study describes a sensitive, simple and accurate high-performance liquid chromatographic method with ultraviolet detection for the simultaneous detection of heroin, 6-acetylmorphine, morphine, tramadol and O-desmethyltramadol in the blood of rats using a liquid-liquid back-extraction method. The separation was performed on LichroCART RP-18e with particle size of 5 μm (250 × 4.6 mm) with mobile phase acetonitrile-50 mM KH(2)PO(4) buffer, pH 7.1, using a gradient mode with a 1.0 mL/min flow rate. The calibration curves were linear in the concentration ranges 0.25-100 and 0.1-100 μg/mL for morphine and other analytes, respectively. Recovery values for the substances ranged between 59 and 83%. This technique was successfully used in pharmacokinetic studies measuring 6-acetylmorphine, morphine, tramadol and O-desmethyltramadol in the blood of rats intraperitoneally treated with a blend of 10 mg/kg heroin and 70 mg/kg tramadol. This technique shows promise for analysis of confiscated street heroin.     

在线固相萃取–液相色谱法测定水中3种微囊藻毒素

建立了在线固相萃取–液相色谱法测定水中3种微囊藻毒素的方法。采用Acclaim PA Cartridge在线固相萃取小柱(10 mm×4.3 mm,5μm),以KH2PO4缓冲溶液–甲醇为富集流动相,进样体积为10 m L。以KH2PO4缓冲溶液–乙腈为洗脱流动相,采用二极管阵列检测器进行检测,检测波长为238 nm。微囊藻毒素MC–LR,MC–RR在0.1~10.0μg/L范围内线性关系良好,MC–YR线性范围则为0.1~5.0μg/L,相关系数r2不小于0.998,3种微囊藻毒素MC–LR,MC–RR,MC–YR的检出限均为0.1μg/L(S/N=3),水源水加标回收率为96.9%~105.4%,测定结果的相对标准偏差为3.55%~6.46%(n=12)。该方法适用于水源水及饮用水中3种微囊藻毒素的快速测定。     

Development and validation of an HPLC method for determination of ziprasidone and its impurities in pharmaceutical dosage forms

Ziprasidone is known as a novel "atypical" or "second-generation" antipsychotic drug. A sensitive and reproducible method was developed and validated for determination of ziprasidone and its major impurities, which are significantly different in polarity. The separation is performed on a Waters Spherisorb octadecylsilyl 1 column (5.0 microm particle size, 250 x 4.6 mm id) using a gradient with mobile phase A [buffer-acetonitrile (80+20, v/v)] and mobile phase B [buffer-acetonitrile (10+90, v/v)] at a working temperature of 25 degrees C. The buffer was 0.05 M KH2PO4 solution with an addition of 10 mL triethylamine/L solution, adjusted to pH 2.5 with orthophosphoric acid. The flow rate was 1.5 mL/min, and the eluate was monitored at 250 nm using a diode array detector. Optimization of the experimental conditions was performed using partial least squares regression, for which four factors were selected for optimization: buffer concentration, buffer pH, triethylamine concentration, and temperature. The proposed validated method is convenient and reliable for the assay and purity control in both raw materials and dosage forms.     

Liquid chromatographic method for the analysis of buspirone HCl and its potential impurities

An accurate, reproducible, and sensitive method for the determination of buspirone HCl and its potential impurities is developed and validated. The validated liquid chromaography method is conducted to meet the Food and Drug Administration/ International Conference on Harmonization requirements for the analysis of buspirone HCI in the presence of its impurities. Five buspirone HCI potential impurities, including 1-(2-pyrimidinyl)-piperazine (I), propargyl chloride (II), 3,3'-tetramethylene glutarimide (III), propargyl glutarimide (IV), and the Mannich base-condensate of I-IV fumarate (V), are separated using a microBondapack C18 column by gradient elution with a flow rate 2.0 mL/min. The initial mobile phase composition is 90:10 (v/v) 10mM KH2PO4 (pH 6.1)-acetonitrile. After a 1-min initial hold, a linear gradient is performed in 26 min to 35:65 (v/v) 10mM KH2PO4 (pH 6.1)-acetonitrile. The samples are detected at 210 and 240 nm using a photo-diode array detector. The linear range of detection for buspirone HCI was between 1.25 ng/microL and 500 ng/microL, with a limit of quantification of 1.25 ng/microL. The linearity, range, peak purity, selectivity, system performance parameters, precision, accuracy, and robustness for all of the impurities were also shown to have acceptable values.     

Determination of glucosamine and carisoprodol in pharmaceutical formulations by LC with pre-column derivatization and UV detection

A simple and reliable precolumn derivatization liquid chromatography method with ultraviolet detection has been developed and validated for the analysis of glucosamine (GS) in various dietary supplement formulations and raw materials. Additionally, the proposed method was used for analysis of carisoprodol (CR) found in ternary mixture with paracetamol (PR) and caffeine (CF). The linearity ranges were 1-100 μg/mL for GS, 1-150 μg/mL for CR, PR and CF. Derivatization was used with 1,2-naphthoquinone-4-sulphonic acid sodium salt in the presence of borate buffer. Chromatographic separation of GS-naphthoquinone derivative was achieved by using a mixture of acetonitrile and water (pH 7.3 adjusted with 0.1 M NaOH) in the ratio 10:90, v/v and flow-rate of 1.0 mL/min. UV detection was carried out at 280 nm. For PR, CF, and CR-naphthoquinone derivative, the chromatographic separation was achieved by using mixture of acetonitrile and 20 mM KH(2)PO(4) (pH 3.0 adjusted with phosphoric acid) in the ratio 20:80, v/v and flow-rate of 1.0 mL/min. UV detection was carried out at 275 nm. The limits of detection were 37.2, 35.9, 30.4 and 40.0 ng/mL for GS, CR, PR and CF, respectively.     

Determination of the analgesic components of Spasmomigraine tablet by liquid chromatography with ultraviolet detection

A procedure was developed for the determination of the analgesic components of Spasmomigraine tablets, which are ergotamine (I), propyphenazone (II), caffeine (III), camylofin (IV), and mecloxamine (V). They were subjected to high-performance liquid chromatography on a column (300 x 3.9 mm, 10 rlm particle size) packed with micro-Bondapak C18. Separations were achieved with the mobile phase methanol-water-triethylamine (60 + 40 + 0.1, v/v/v) flowing at a rate of 1.5 mL/min, and quantitative determination was performed at 254 nm at ambient temperature for I-III; acetonitrile-25 mM KH2PO4-acetic acid (45 + 55 + 0.2, v/v/v), flowing at a rate of 1.5 mL/min and detection at 234 nm at ambient temperature, was used for IV and V. Methyl paraben was used as an internal standard. The detection limits were 0.35 (I), 5.0 (11), 1.5 (111), 3.0 (IV), and 2.0 microg/mL (V). The method was accurate (mean recovery 98+/-2%, n = 4) and precise (coefficient of variation <5%, n = 5). The proposed method is rapid and sensitive and, therefore, suitable for the routine control of these ingredients in multicomponent dosage forms.