ASE-HPLC检测某型号球形发射药中的叠氮硝胺、硝化甘油、Ⅱ号中定剂含量的研究

采用快速溶剂萃取（ASE）技术和高效液相色谱法测定某球形药中叠氮硝胺（DIANP）、硝化甘油（NG）和Ⅱ号中定剂（C2）的含量．ASE提取条件：二氯甲烷做萃取溶剂,萃取温度100℃,静态萃取10min,萃取2次．HPLC测定条件：YWGC18柱（150×4．6mm,10μm）,以甲醇和水作为流动相,梯度洗脱,流速1 mL／min,检测波长210nm．测定结果表明DIANP、NG、C2平均回收率分别为99．6％、100．3％、99．4％,RSD分别为0．7％、0．8％、0．9％（n=5）,检出限分别为2.1、1.5和0．2mg／L,线性范围分别为0．02～0．98g／L,0．03～1．38g／L,0．002～0．124g／L．用此方法共检测某批球形发射药样品5份,检测结果与滴析-HPLC法检测结果相当．     

加速溶剂萃取–液相色谱法测定五灵脂药材中原儿茶酸的含量

建立了五灵脂中原儿茶酸含量的测定方法。利用加速溶剂萃取仪(ASE),以75%乙醇水溶液提取样品中的待测物,用Diamosil C18(4.6 mm×250 mm,5.0μm)色谱柱在梯度洗脱条件下分离待测物,外标法定量。原儿茶酸的线性范围为0.1~10.0 mg/L,相关系数r=0.9998。方法的回收率为83%~107%,测定结果的相对标准偏差为4.6%~10.5%,方法的定量限为1.0 mg/kg。该方法操作简便、快速,提取效率高,适用于检测和分析五灵脂中原儿茶酸的含量。     

海产品、底泥、海水中扑草净药物残留量的液相色谱-串联质谱检测

建立了海产品、底泥、海水中扑草净药物残留量的液相色谱-串联质谱检测方法。对海产品、底泥样品,采用快速溶剂提取仪(ASE)乙腈提取,凝胶渗透色谱(GPC)净化,液质联用仪(LC-MS/MS)分析;对海水样品采用酸化乙腈提取,氨基固相萃取柱净化,LC-MS/MS分析。实验结果显示,扑草净在浓度0.025～8.0ng/mL时,线性关系良好(R2=0.9999);海产品、底泥样品的方法测定低限为0.25μg/kg,3个加标水平下的平均回收率为90.0%～105.4%,相对标准偏差(RSD)为2.9%～5.3%;海水样品的方法测定低限为0.50μg/L,3个加标水平下的平均回收率为79.5%～99.6%,RSD为3.4%～11.9%。该方法简单、快速、准确,可用于海产品、底泥、海水样品中扑草净的筛选和测定。     

气相色谱法测定仓储双基发射药二号中定剂含量

 利用气相色谱法迅速分离并准确测定仓储发射药中具有安定作用的二号中定剂(二甲基二苯脲)的含量。该法与传统的溴化法比较,具有快捷、准确、直观、重复性好等特点,可以为正确评估发射药的质量等级提供可靠数据。     

丁硝胺乙基硝酸酯合成2-叠氮乙基丁硝胺反应动力学研究

丁硝胺乙基硝酸酯（BuNENA）叠氮化是合成2-叠氮乙基丁硝胺（BuAENA）的经典方法.利用高效液相色谱法跟踪反应过程中原料浓度随时间的变化情况,对该反应动力学进行了研究.通过对实验数据的拟合,得出了62,70和80℃下的反应速率常数.结果表明反应为二级反应,分反应级数各为一级,反应的表观活化能Ea为85.06 kJ...     

加速溶剂萃取-QuEChERS/超高效液相色谱-串联质谱法同时测定药食同源性食品中双酚类化合物

建立了加速溶剂萃取(ASE)-QuEChERS/超高效液相色谱-串联质谱(UPLC-MS/MS)同时测定药食同源性食品中11种双酚类化合物残留的分析方法。样品经ASE萃取,萃取溶剂为乙腈-乙酸-水(89∶1∶10,体积比),萃取温度为80℃,静态萃取时间为6 min,循环2次。萃取液经QuEChERS法净化,采用ACQUITY UPLC HSS T3色谱柱(2.1 mm×100 mm,1.8μm)分离,以甲醇(含0.1%甲酸)和5 mmol/L乙酸铵水溶液(含0.1%甲酸)为流动相进行梯度洗脱,电喷雾电离源正、负模式下同时进行多反应监测(MRM)测定,同位素内标法定量。11种双酚类化合物在0.5～50.0μg/L范围内呈良好线性,相关系数(r²)不小于0.996 0,检出限为0.1～0.5μg/kg,定量下限为0.3～1.5μg/kg;3个加标水平的回收率为72.4%～108%,相对标准偏差(RSD)为1.7%～15%。该方法操作简单、快速、灵敏度高、重现性好,适用于药食同源性食品中双酚类化合物的同时快速测定。     

反相液相色谱法同时检测染发剂中4种合成染料的研究

应用超高效液相色谱(UPLC),建立了一套同时分析染发剂中酸性紫6B、罗丹明B、甲基紫2B、结晶紫4种染料类化合物的方法。该方法用V(乙腈):V(水)=30:70萃取染发剂中的染料类成分,定容后用作UPLC检测。经CapcellPakC18色谱柱分离,检测器波长560nm。4种染料类物质的检出限均不高于0.01μg/mL,定量限均不高于0.05μg/mL。用外标法定量,3个添加水平下,4种物质回收率在74.60%～109.15%之间,RSD(n=6)在0.67%～12%之间。方法可用于染发剂中合成染料类物质的快速检测。     

加速溶剂萃取/超高效液相色谱-串联质谱法测定沉积物中三苯甲烷类杀菌剂

采用超高效液相色谱-三重四极杆质谱(UPLC-MS/MS),结合加速溶剂萃取(ASE)前处理技术,建立了同时测定沉积物中3种三苯甲烷类残留(孔雀石绿、结晶紫、亮绿)的方法。干燥研磨后的底泥样品用中性氧化铝混合分散,以乙腈-Mc Ilvaine缓冲溶液(体积比10∶2)为萃取液,经ASE萃取富集后进入液相色谱-串联质谱分析,内标法定量。结果表明:3种三苯甲烷类化合物的峰形对称并完全分离,在0.5~50.0μg/L范围内线性良好(r0.998);在1 500 psi压力及60℃萃取温度下,目标物的回收率为65.8%~112%,相对标准偏差(n=6)为5.1%~14.4%,方法检出限为0.006~0.007μg/kg,定量下限为0.024~0.028μg/kg。该方法已用于滆湖沉积物中3种目标化合物的检测,为我国环境监管提供了技术支撑和数据支持。     

全自动加速溶剂萃取-高效液相色谱-串联质谱法测定土壤中6种抗生素的残留量

随机选取代表性土壤样品约1 kg,四分法将土壤样品缩分,取约200 g风干、粉碎、过筛。取上述土壤样品10.0 g置于萃取池中,加入硅藻土15.0 g混合均匀后进行加速溶剂萃取(ASE),采用凝胶净化系统净化提取液。取净化液10 mL,于50℃氮吹至近干,残渣用1 mL甲醇溶解,过0.22μm滤膜,采用高效液相色谱-串联质谱法(HPLC-MS/MS)测定其中林可霉素、克林霉素、洛美沙星、培氟沙星、恩诺沙星和环丙沙星等6种抗生素的含量,质谱分析采用多反应监测模式。结果表明,6种抗生素的质量浓度在0.001～1.0 mg·L^-1内与对应的峰面积呈线性关系,检出限(3S/N)为0.004～0.019μg·kg^-1。方法用于分析单标准溶液和加标样品溶液,所得测定值的相对标准偏差(n=6)均小于4.0%。按标准加入法进行回收试验,回收率为83.8%～105%。方法用于实际样品分析,6种抗生素的检出量为15.7～221.6μg·kg^-1。     

黄芪中黄酮类化合物的超临界流体色谱分离方法研究

考察了超临界流体色谱（SFC）中的色谱柱、改性剂、添加剂、流速、柱温和背压等因素对9种黄酮类成分（包括芒柄花素、异鼠李素、毛蕊异黄酮、山奈酚、槲皮素、紫云英苷、芒柄花苷、异槲皮苷、毛蕊异黄酮葡萄糖苷）分离的影响,与高效液相色谱法（HPLC）进行了比较,并建立了黄芪饮片中5种主要黄酮类化合物的SFC分析方法。采用Agilent ZORBAX RX－SIL色谱柱（4.6 mm × 150 mm,5 μm）进行分离,CO2－0.1%磷酸甲醇溶液为流动相梯度洗脱,流速为3 mL/min;柱温为35 ℃;背压为10 MPa,9种黄酮类化合物可在10 min内实现基线分离。5种黄酮类化合物在一定质量浓度范围内均具有良好的线性关系（r2 ≥ 0.963 2）,检出限为10.69 ~ 16.21 μg/mL,日内相对标准偏差（RSD）为1.3% ~ 2.0%;日间RSD为1.6% ~ 2.2%。5种黄酮类化合物在48 h内具有良好的稳定性,重复性为3.6% ~ 6.0%,回收率为91.8% ~ 112%。与HPLC法相比,9种化合物的保留时间顺序基本相反,SFC法更快速、经济环保,且其保留及选择性受色谱柱、改性剂和添加剂的影响较大,添加剂对色谱峰形影响明显。     

Interfacing ASE and HPLC for the Determination of PAH in Soil

A method was developed to couple an accelerated solvent extraction system (ASE) with high performance liquid chromatography (HPLC) for the analysis of PAH in soil samples. The resolution of HPLC is well maintained while the advantages of ASE, fast extraction, less solvent consumption and ease of operation, are well expressed. The precision and accuracy of this method are verified by a series of analyses of reference material, and the precision of retention from multiple injection indicates minimum loss of chromatographic resolution by the interface of this technique. Detection limits for the studied PAH range from 0.07 ng/Kg to 0.21 ng/Kg with a fluorescence detector.     

加速溶剂萃取-高效液相色谱法测定塑料制品中多溴二苯醚

提出了塑料制品中多溴二苯醚的高效液相色谱法。样品经粉碎后用乙醇-丙酮(1+1)萃取溶剂经加速溶剂萃取仪在150℃静态萃取10min,提取液旋转蒸发后用正己烷溶解过硅胶固相萃取柱净化,流出液蒸发至近干用异辛烷-甲苯(4+1)混合溶剂定容后,注入高效液相色谱仪分离测定。方法的检出限(3S/N)在0.1～0.2mg.L-1之间,加标回收率在87%～104%之间。     

应用加速溶剂萃取法分离烟丝致香成分

目前,人们越来越重视吸烟与健康问题,采用多种手段来降低卷烟中的焦油含量,而焦油含量降低的同时,卷烟的香气和吃味却受到很大的影响。为了解决这个矛盾,通过分析卷烟香味组成,从而指导各种不同香味风格的烟草香精研制,应用于卷烟加香,有效地改善与提高卷烟的香气和吃味,保证卷     

The Extraction of Polycyclic Aromatic Hydrocarbons from Atmospheric Particulate Matter Samples by Accelerated Solvent Extraction (ASE)

Abstract

The Accelerated solvent extraction (ASE) of PAHs (23 2- to 6-ring species) spiked onto glass fibre filters (GFFs) was studied as a function of variable extraction solvents, pressure, temperature and extraction times. Acceptable recoveries (85% ± 15%) were obtained for certain combinations of conditions and a tentative method (1500 psi, 150°C, 70:30 hexane:acetone mixture, 7 min heat-up time, 5 min static extraction time, 60% flush volume, 2 static cycles was selected for further testing. However, this method did not prove as effective as the traditional Soxhlet method of extraction when these parameters were used to extract native PAHs from ambient atmospheric particulate matter collected on a GFF by Integrated Atmospheric Deposition Network (IADN) sampling protocols. The extraction recovery study for spiked GFFs was repeated using slightly different extraction conditions: 2000 psi, 100°C, 70:30 hexane:acetone, 5 min heat-up time, 5 min static extraction time, 150% flush volume, 3 static cycles. When this method was applied to the extraction of native PAHs from ambient atmospheric particulate matter collected on GFFs, the results showed equivalent or better recoveries to that of the Soxhlet method. The total time of extraction was 25 min requiring only 30 mL of solvent. This ASE method is presently used to quantitatively determine PAHs in IADN particle-phase samples.     

加速溶剂萃取分离-液相色谱法测定五灵脂药材中3种成分的含量

取五灵脂药材(1.0g)与海沙3.0g混匀,置于加速溶剂萃取(ASE)仪中,加入萃取溶剂[乙醇-水(75+25)]静态萃取循环3次,每次10min,萃取温度为100℃,压力为15 MPa。萃取液蒸缩至3mL,加C2H5OH-H2O(75+25)至5.0mL,过滤后供液相色谱分析。在色谱分离中,以Diamosil ODS C18色谱柱为固定相,用(A)甲醇和(B)乙酸(0.5+99.5)溶液以不同比例的混合液作为流动相进行梯度淋洗。在波长360nm处进行检测。药材中的芦丁、山奈酚和穗花杉双黄酮的质量浓度与相应的峰面积之间呈线性关系,3种组分的检出限(3S/N)在0.3~0.6mg·kg-1之间。在3个浓度水平条件下用标准加入法进行回收试验,测得回收率在80.0%~95.0%之间,测定值的相对标准偏差(n=5)在3.2%~9.6%之间。     

加速溶剂萃取/离子色谱法测定菊花中的SO_2残留

采用碱性溶液加速溶剂萃取(ASE)/离子色谱(IC)法测定,建立了菊花中SO2残留的分析方法。粉碎后的样品以碱性溶液为萃取溶剂,经加速溶剂萃取仪提取,C18固相萃取(SPE)净化后,以碳酸盐为淋洗液,IonPac AS9-HC离子色谱柱分离,电导检测器进行检测。结果表明,SO2(以SO2-3计)在0.5~50 mg·L-1范围内线性关系良好(r2=0.999 7),检出限(LOD)为0.05 mg·L-1,定量下限(LOQ)为0.17 mg·L-1。以空白菊花样品为基体,在低、中、高3个浓度水平下的平均加标回收率为82.9%~92.6%,RSD(n=6)小于5.0%。与传统方法相比,该方法具有自动化程度和提取效率高的优点,适合于批量测定菊花中的SO2残留。     

Determination of Atmospheric Polycyclic Aromatic Hydrocarbons Using Accelerated Solvent Extraction

Abstract

An accelerated solvent extraction (ASE) method has been developed for the determination of polycyclic aromatic hydrocarbons (PAHs) present in both atmospheric particulate and gaseous phases in this study. Extraction parameters such as the combination of solvents, extraction temperature, and static extraction time were investigated and optimized. Effective extraction was achieved using a 3:1 mixture of n-hexane and acetone as extraction solvents at 100°C in 30 min for all the compounds studied. The optimized extraction method was compared with conventional extraction methods and validated using National Institute of Standards and Technology (NIST)–certified standard reference material (SRM) 1649a. The recoveries obtained for certified 12 PAHs were in the range of 82–126% with relative standard deviation (RSD) between 6 and 28%. The validated ASE technique was used followed by gas chromatography–mass spectrometry (GC-MS) for the determination of PAHs distributed between gaseous and particulate phases in the atmosphere of Singapore. Total average concentrations of PAHs in air samples were 33.54 ± 19.32 ng m^?3, with 4.72 ± 2.80 ng m^?3 in particulate phase and 28.82 ± 16.92 ng m^?3 in gaseous phase, respectively. The results obtained from this study are compared to those reported from other areas of the world.     

Adapting the Accelerated Solvent Extraction Method for Resin and Rubber Determination in Guayule Using the BÜCHI Speed Extractor

Guayule (Parthenium argentatum Gray) is a promising alternative source to Hevea brasiliensis for the production of natural rubber, which can reach levels of 8–9% under industrialized farming conditions. The most common method for determining rubber concentration is by accelerated solvent extraction (ASE), a technique developed by the Dionex Corporation and almost exclusively performed with the Dionex ASE-200 or 350 systems. Herein, it is sought to apply and adapt the most common methods used in the literature for the Dionex system to another extraction platform, the BÜCHI Speed Extractor E-914. Results showed that using a sand sandwich method to confine the sample in the center and exploiting a larger cell volume (80 mL) for extraction prevents the occurrence of overpressure and problems with clogging. Under optimized conditions, the coefficient of variation was <15% for both resin quantification for samples containing 5.0–15.8% of resin and for rubber quantification for samples with 1.7–10.3% rubber content. The extraction time for resin (2 cycles of 5 min each) was smaller than for rubber (2 cycles of 20 min each). It would be interesting to carry out interlaboratory comparisons to standardize the method at an international level.