固相萃取-高效液相色谱法测定化妆品中荧光增白剂

建立了化妆品中荧光增白剂的固相萃取-高效液相色谱检测方法。样品经40%乙腈溶液超声提取,用C_(18)固相萃取柱净化,液相色谱-荧光法测定,外标法定量。在优化后的实验条件下,11种荧光增白剂在0.10～10.0 mg/L浓度范围内线性关系良好,相关系数(r)≥0.9990,方法检出限为0.03～0.2 mg/kg,回收率为82.2%～103%,相对标准偏差为3.1%～6.2%。该方法准确、灵敏,适用于化妆品中11种荧光增白剂的同时测定。     

洗涤用品中5种荧光增白剂的高效液相色谱法检测及质谱确证

建立了同时测定洗涤用品中5种荧光增白剂类化合物(荧光增白剂393、荧光增白剂KCB、荧光增白剂CBS-127、荧光增白剂KSN和荧光增白剂OB)的高效液相色谱分析方法及质谱确证方法。洗涤样品以四氢呋喃为提取溶剂进行超声提取,提取液离心处理后,取上清液经微孔滤膜过滤后测定。采用Agilent Eclipse XDB-C18色谱柱(250 mm×4.6 mm,5μm)分离,以甲醇-水二元流动相梯度洗脱,流速1.0 mL/min,柱温25℃,荧光增白剂KCB和荧光增白剂CBS-127的检测波长为359 nm,荧光增白剂393、荧光增白剂KSN和荧光增白剂OB的检测波长为372 nm。荧光增白剂393的定量限为0.25 mg/kg,荧光增白剂KCB、荧光增白剂CBS-127、荧光增白剂KSN和荧光增白剂OB的定量限为0.5 mg/kg。在低、中、高3种加标水平下的平均回收率为87.8%~103.7%,相对标准偏差为1.5%~4.4%。方法的日内RSD均小于1%,日间RSD均小于2%。适用于洗涤用品中5种荧光增白剂类化合物的测定。     

高效毛细管电泳测定鸡蛋中三聚氰胺

建立了高效毛细管电泳-二极管阵列检测器检测鸡蛋中三聚氰胺的方法.样品用三氯乙酸提取,固相萃取小柱净化处理后进行检测,以50 mmol/L甲酸-50 mmol/L甲酸铵(pH 2.5)为缓冲溶液,在总长度为58.5 cm,内径为75 μm的毛细管中,分离时间约6 min,测得的定量限为0.25 mg/kg.三聚氰胺浓度在0.25～5.0 mg/kg范围内进行添加回收实验,平均回收率为80.2%～90.7%,相对标准偏差(RSD)为1.7%～3.4%.本方法简单易行、高效快速、经济环保,可以满足检测需要.     

固相萃取/高效液相色谱荧光法测定草珊瑚中苯并[α]芘残留

采用固相萃取方法,建立了草珊瑚中苯并[α]芘的高效液相色谱荧光测定方法。以正己烷为提取溶剂对草珊瑚样品进行提取,经中性氧化铝固相萃取柱净化样品后,用高效液相色谱荧光检测器检测,荧光检测器激发波长为370 nm,发射波长为425 nm,流动相为乙腈-水(85∶15),流速为1.0 m L/min。结果表明:苯并[α]芘在0~20 ng/m L浓度范围内线性关系良好,相关系数(r)为0.999 9,定量下限为0.36μg/kg,回收率为84.4%~101.9%,相对标准偏差(RSD)为1.6%~5.6%。该方法准确,灵敏度高,重复性好,适用于植物药材中苯并[α]芘残留的测定。     

微波辅助萃取法测定烟草中有机氯类农药残留量

建立了一种微波辅助萃取-固相萃取净化测定烟草中17种有机氯类农药残留量的新方法. 样品用V(正己烷):V(乙酸乙酯)＝1:1提取, 提取液经Florisil固相萃取柱净化后, 采用气相色谱-电子捕获检测器(GC-μECD)进行检测. 17种有机氯农药的0.01、 0.05 mg/kg和0.5 mg/kg加标回收率均在82%以上, RSD在0.11%～8.2%之间, 能满足当前烟草中有机氯农药残留的检测要求.     

基质固相分散气相色谱电子捕获检测器测定葡萄酒中5种农药残留

采用基质固相分散的样品前处理方法,替代传统的液-液萃取、固相萃取,从葡萄酒中提取、净化5种农药,气相色谱电子捕获检测器分析测定,基质匹配标准校正方法补偿基质效应。添加3水平(0.01-0.10mg/L)的回收率为85.7%-104.6%;相对标准偏差为3.6%-8.5%;检出限达到0.1-0.8μg/kg。本方法可用于葡萄酒样品中农药残留的测定。     

分散固相萃取-高效液相色谱法快速测定果蔬中的6种保鲜剂残留量

建立了采用分散固相萃取-高效液相色谱同时测定果蔬中2,4-滴、噻苯咪唑、乙萘酚、邻苯基苯酚、二苯醚和联苯6种保鲜剂残留量的方法。样品经乙腈提取(同时加入氯化钠和无水硫酸镁),提取液经酸性氧化铝分散固相萃取净化,采用Agilent TC C18色谱柱(250 mm×4.6 mm, 5 μm),以甲醇-0.02 mol/L的磷酸二氢钾溶液(pH 6)作为流动相,流速1.0 mL/min,梯度洗脱,用紫外检测器检测,检测波长为235 nm,外标法峰面积定量。6种保鲜剂在0.5～20 mg/L范围内线性关系良好,相关系数均大于0.99; 6种保鲜剂在样品中添加1、2和10 mg/kg 3个浓度水平的回收率为84.2%～99.1% (n=6),相对标准偏差为1.67%～10.3%;方法的定量限为1 mg/kg。该法简便、准确,适用于果蔬中6种保鲜剂残留量的检测。     

凝胶渗透色谱-固相萃取/高效液相色谱法同时测定水产品中甲基睾酮与己烯雌酚

建立了凝胶渗透色谱-固相萃取/高效液相色谱法测定水产品中甲基睾酮和己烯雌酚的分析方法。样品经乙醚超声提取和漩涡振荡后以乙酸乙酯-环己烷(1∶1)为流动相进行凝胶渗透色谱净化,再过HLB柱进一步净化,以甲醇-水(72∶28)为流动相,采用高效液相色谱/紫外检测器在254 nm波长下测定,外标法定量。结果显示甲基睾酮和己烯雌酚在0.02～2.0 mg/L质量浓度范围内呈良好的线性关系,线性系数(r)均大于0.999。空白样品在10.0、50.0、200μg/kg 3个加标水平下的平均回收率为84%～93%,相对标准偏差均小于6.0%。甲基睾酮和己烯雌酚的定量下限分别为6.0μg/kg和5.0μg/kg。     

固相萃取-高效液相色谱法测定水产品中喹乙醇

建立了固相萃取-高效液相色谱法测定水产品中喹乙醇的方法。匀浆后的水产品试样经甲醇溶液提取、正己烷除脂、固相萃取小柱直接净化浓缩后,以体积分数15%的甲醇溶液作为流动相,流速:1.0 m L/min,采用Symmetryshield TM RP18色谱柱进行分离,紫外检测器检测,外标法定量。方法的检出限和定量限分别为0.02 mg/kg和0.05 mg/kg,浓度在0.05~1.00 mg/L范围内,线性良好(r=0.9999)。添加浓度在0.05~1.00 mg/kg时,不同品种水产品的回收率在78%~99.6%之间,相对标准偏差小于7.7%。方法适合于水产品样品的成批定量检测。     

固相萃取-高效液相色谱法同时测定水果中4种植物生长调节剂

建立了固相萃取-高效液相色谱(HPLC)法同时测定水果中6-苄基腺嘌呤、噻苯隆、氯吡脲和烯效唑4种植物生长调节剂的方法。水果样品经乙腈提取,氨基固相萃取小柱净化后,于HPLC紫外检测器变波长检测。对6种水果进行添加回收试验,在0.04~0.4 mg/kg添加水平下,方法的回收率为73.1%~102.7%,相对标准偏差为0.8%~12%,方法的检出限(LODs)为0.005~0.01 mg/kg,定量限(LOQs)为0.015~0.03 mg/kg。     

高效液相色谱法测定一次性卫生用纺织品中荧光增白剂

建立了同时测定一次性卫生用纺织产品中4种荧光增白剂(FWA 357、FWA 220、FWA 204和FWA 113)的高效液相色谱-二极管阵列检测器(HPLC-DAD)检测方法。样品用20 mL超纯水作提取剂,于80 ℃下振荡提取30 min,用高效液相色谱进行定性、定量分析。采用SB Phenyl色谱柱(250 mm×4.6 mm, 5 μm)分离,以5 mmol/L乙酸铵和乙腈为流动相梯度洗脱,成功地将待测荧光物质分离。4种荧光增白剂在0.025~400 mg/L范围内线性关系良好,线性相关系数(r²)均大于0.9999;检出限(S/N=3)分别为0.1、0.1、0.02、0.02 mg/L;方法定量限(S/N=10)分别为1.0、2.0、5.0、5.0 mg/kg。添加水平为20~800 mg/kg时,回收率为83.7%~101.0%,相对标准偏差(n=6)为2.4%~7.0%。该方法前处理简单,回收率高,适用于一次性卫生用纺织产品中4种荧光增白剂的测定。     

Determination of fluorescent whitening agents in laundry detergents and surface waters by solid-phase extraction and ion-pair high-performance liquid chromatography

A simple method was developed to detect four stilbene-type disulfonate and one distyrylbiphenyl-type fluorescent whitening agents (FWAs) in household laundry detergents and surface waters by ion-pair high-performance liquid chromatography. The FWA concentrations in detergents were measured directly. The contents of FWAs in water samples were extracted by solid-phase extraction (C18-SPE) with ion-pairing reagent, and were then determined by an isocratic ion-pair chromatography (IPC) using a C18 column, applying tetrabutylammonium hydrogensulfate (TBA) as the ion-pairing reagent in mobile phase, and equipped with fluorescence detection. Water samples at various pH conditions for SPE were evaluated. Experimental results indicate that the proposed method is precise and sensitive in analyzing FWAs, and enables quantitation of 0.01-0.1 microg/l in 100 ml water samples. The recovery rates of FWAs in spiked water samples were between 73 and 89%, and the precision (RSD) ranged from 2.6 to 8.9%. Over 7200 microg/g of 4,4'-bis(2-sulfostryl)-biphenyl (DSBP) and 2320 microg/g of 4,4'-bis[(4-anilino-6-morpholino-1,3,5-triazine-2-yl)-amino]stilbene-2,2'-disulfonate (DAS1) were detected in household laundry detergents. Trace amounts of DSBP were detected in surface water samples ranging from 0.2 to 3.7 microg/l.     

高效液相色谱法同时测定塑料和纸质包装材料中6种荧光增白剂

建立了同时测定塑料和纸质食品包装材料中6种脂溶性荧光增白剂(FWA 135、FWA 184、FWA 185、FWA199、FWA 378和FWA 393)的高效液相色谱方法。用三氯甲烷-乙腈(3∶7,v/v)混合溶液提取,经HLB小柱净化后用高效液相色谱-荧光检测法进行定性定量分析。采用Phenomenex C18色谱柱分离,以5 mmol/L的乙酸铵水溶液和乙腈为流动相,进行梯度洗脱。结果显示:FWA 393在15~1500μg/L范围内的线性关系良好,其余5种荧光增白剂在5~500μg/L范围内线性关系良好,相关系数均大于0.999;加标回收率为80.4%~125.0%;相对标准偏差(RSD,n=6)为1%~13%。应用该方法分析了市场销售的12个样品以验证方法的实用性。该方法前处理简单,回收率高,精密度好,适用于食品包装材料中6种荧光增白剂的检测。     

Simultaneous determination of four fluorescent whitening agents (including trans and cis isomers) in facial mask by dispersive solid‐phase extraction combined with ultra high performance liquid chromatography and diode array detection

A novel ultra high performance liquid chromatography with diode array detection method, based on the dispersive solid‐phase extraction by using polymer weak anion exchange as the sorbent, was established for the simultaneous determination of fluorescent whitening agents 85, 28, 351, and 71 in facial mask. The amounts of polymer weak anion exchange, adsorption time, and volume of elution solvent in the dispersive solid‐phase extraction technology were optimized, and the developed method was validated in terms of the method limit of detection, method limit of quantitation, linear range, recovery, accuracy, and precision. Results indicated that the standard curves were linear over the selected concentration ranges of 0.05–100 mg/L for four target analytes, with determination coefficients greater than 0.999. The method limits of quantitation of the target analytes were in the range of 0.6–2.8 mg/kg. Recoveries were calculated at the concentrations of 1.0–30 mg/kg spiked in negative samples and the values were between 89.3 and 102% with an RSD of 2.5–5.1% for intraday precision and 3.8–5.0% for interday precision. The method was successfully applied to analyze 20 facial mask samples and fluorescent whitening agent 85 was detected in one sample with the concentration of 4.7 mg/kg.     

超声辅助分散液液微萃取-高效液相色谱测定护肤水中9种荧光增白剂

建立了超声辅助分散液液微萃取技术结合高效液相色谱配荧光检测器(UA-DLLME-HPLC-FLD)同时测定护肤水中9种荧光增白剂(FWAs)残留量的检测方法。考察了萃取剂的种类与体积、分散剂的种类与体积分数、盐效应、pH值、超声时间等因素对萃取效果的影响,确定最佳萃取条件:50μL三氯甲烷为萃取剂,250μL甲醇为分散剂,氯化钠用量为0.20 g,4 500 r/min离心2 min。在优化条件下,9种荧光增白剂在一定质量浓度范围内线性关系良好,相关系数均大于0.999 0,方法检出限(S/N=3)为0.06~4.20 mg/kg,定量下限(S/N≥10)为0.2~14.0 mg/kg,方法的平均回收率为84.3%~102.4%。该方法具有有机溶剂用量少、操作简单、快捷、灵敏等优点。     

Ionic liquid as a mobile phase additive in high‐performance liquid chromatography for the simultaneous determination of eleven fluorescent whitening agents in paper materials

In the present study, 11 4,4′‐diaminostilbene‐2,2′‐disulfonic acid based fluorescent whitening agents with different numbers of sulfonic acid groups were separated by using an ionic liquid as a mobile phase additive in high‐performance liquid chromatography with fluorescence detection. The effects of ionic liquid concentration, pH of mobile phase B, and composition of mobile phase A on the separation of fluorescent whitening agents were systematically investigated. The ionic liquid tetrabutylammonium tetrafluoroborate is superior to tetrabutylammomnium bromide for the separation of the fluorescent whitening agents. The optimal separation conditions were an ionic liquid concentration at 8 mM and the pH of mobile phase B at 8.5 with methanol as mobile phase A. The established method exhibited low limits of detection (0.04–0.07 ng/mL) and wide linearity ranges (0.30–20 ng/mL) with high linear correlation coefficients from 0.9994 to 0.9998. The optimized procedure was applied to analyze target analytes in paper samples with satisfactory results. Eleven target analytes were quantified, and the recoveries of spiked paper samples were in the range of 85–105% with the relative standard deviations from 2.1 to 5.1%. The obtained results indicated that the method was efficient for detection of 11 fluorescent whitening agents.     

固相萃取-气相色谱-串联质谱法测定乳胶儿童用品中15种N-亚硝胺及其前体物的迁移量

建立了同时测定乳胶儿童用品中15种N-亚硝胺及其前体物迁移量的固相萃取-气相色谱-串联质谱(SPEGC-MS/MS)分析方法。以人工唾液作为迁移模拟物,以Chromabond Easy固相萃取柱(填料的主要成分是极性修饰的聚乙烯-二乙烯基苯共聚物)对迁移液中的N-亚硝胺分析物进行净化,采用HP-5 MS UI色谱柱分离,MS/MS在多反应监测模式下进行定性及定量分析。15种N-亚硝胺在5~2 000μg/L范围内呈良好的线性关系,相关系数均大于0.998;方法定量限(S/N=10)为0.625~12.50μg/kg,低于欧盟2 009/48/EC指令的限量要求。在低、中、高3个添加水平的回收率为53.8%~116.2%、52.7%~105.1%和49.5%~102.9%;日内精密度分别为1.3%~14.0%(n=6),日间精密度为1.6%~7.6%(n=4)。采用本方法对婴儿奶嘴样品和气球样品进行了测定,其中4件奶嘴和7件气球样品中检出亚硝胺及其前体物,奶嘴和气球中N-亚硝胺的总检出含量分别为0.049 9~0.126mg/kg和0.515~41.2 mg/kg;N-亚硝胺前体物总检出量分别为0.026 4~0.030 0 mg/kg和0.187~12.5mg/kg。     

婴童纺织用品中可迁移荧光增白剂含量的研究

本文建立了测定婴童纺织用品中可迁移荧光增白剂的紫外分光光度法。样品用pH约为8的水作为提取剂在37℃条件下提取,提取液用紫外分光光度计进行测定,检测波长为350nm。荧光增白剂迁移总量(以FWA85计)在0~100mg·L^-1浓度范围内线性关系良好,相关系数(r^2)大于0.999,仪器检出限(3S/N)为0.13mg·L^-1,方法测定下限(10S/N)为18.0mg·kg^-1,平均回收率范围为92.0~98.3%,相对标准偏差(n=7)为2.26~4.56%。该方法操作简便,结果准确,可用于分析婴童纺织用品中荧光增白剂的迁移总量。     

在线固相萃取净化-液相色谱-串联质谱法测定猪肉中10种大环内酯类抗生素

建立了在线固相萃取净化-液相色谱-串联质谱检测猪肉中10种大环内酯类抗生素残留的方法。样品经过乙腈提取,提取液40℃旋蒸至干后,分析物用2 mL磷酸盐缓冲液溶解,溶解液经在线固相萃取柱(HLB柱)富集净化,甲醇洗脱,然后转移至XBridge BEH C18色谱柱上,以10 mmol/L乙酸铵水溶液和乙腈溶液为流动相进行分离,最后用串联四极杆质谱检测。结果表明,10种大环内酯类抗生素在0.1~200μg/L范围内呈现良好的线性关系,相关系数均大于0.990。方法的检出限范围为0.05~0.30μg/kg,定量限范围为0.10~1.00μg/kg;添加水平为0.10~10.0μg/kg时,方法回收率为69.6%~115.2%,相对标准偏差(RSD)10%。该方法可以作为猪肉中大环内酯类抗生素的检测方法。     

高效液相色谱-串联质谱法测定泡沫灭火材料及其他材料中的全氟辛烷磺酸及其盐

建立了一种高效液相色谱-串联质谱(HPLC-MS/MS)测定泡沫灭火材料、洗涤剂以及织物整理剂中全氟辛烷磺酸及其盐(PFOS)的方法。对应产品中的PFOS用水超声提取后,经固相萃取柱淋洗萃取,萃取液以乙腈-10 mmol/L乙酸铵溶液(80:20, v/v)为流动相进行HPLC分离,在负离子模式和多级反应监测(MRM)方式下进行测定。用两个子离子的相对丰度定性,外标法定量。PFOS的测定在0.002~0.1 mg/L范围内线性关系良好(r2=0.998);泡沫灭火材料、洗涤剂以及织物整理剂中PFOS的加标回收率分别为93.4%～103%, 93.2%～102%和91.8%～102%,精密度(以相对标准偏差(RSD)计)分别为0.48%～3.52%, 0.78%～1.79%和0.47%～3.47%;方法的检出限均为2 mg/kg(0.0002%)(信噪比（S/N）≥10),满足欧盟法规对泡沫灭火材料、洗涤剂以及织物整理剂中PFOS的限量检测要求。该方法准确度和灵敏度高,前处理简单,可用于泡沫灭火材料、洗涤剂以及织物整理剂中PFOS的检测。