UPLC-MS/MS法同时测定蔬菜中34种农药残留

采用超高液相色谱-串联质谱联用仪(UPLC-MS/MS)技术建立了同时检测蔬菜中34种农药多残留量的快速检测方法。样品经乙腈提取,浓缩定容后用Qu ECh ERS农残净化管净化,Acquity BEH-C18超高液相色谱柱分离,进入电喷雾串联四极杆质谱进行检测,采用多反应监测(MRM)分析,对液质分离条件进行优化。结果表明34种农药在10 ng/m L~200 ng/m L范围内线性良好(r≥0.993 6)。在10μg/kg~30μg/kg范围内,平均加标回收率在68.7%~116.8%之间,RSD≤12%。该方法检出限为0.001 mg/kg~0.01 mg/kg,测定结果满足蔬菜样品中多残留农药的检测要求。     

QuEChERS法结合在线凝胶色谱-气相色谱/质谱法测定人体尿液中34种农药残留

目的建立Qu ECh ERS方法结合在线凝胶渗透色谱-气相色谱/质谱系统用于人尿中34种中高毒农药的快速筛查方法。方法研究Qu ECh ERS各因素如萃取剂、萃取剂用量、萃取次数和净化吸附剂种类对尿样提取净化效果的影响。采用选择离子监测模式,外标法测定人尿中34种农药含量。结果 34种农药在人尿中的检出限为0.05~3.2μg/kg,在0.05μg/g添加水平的平均回收率为81.1%~108.8%,相对标准偏差(RSD)为2.7%~10.4%。结论本法具有操作便捷、通用性强等特点,适用于人尿中34种农药残留的快速筛查与检测。     

采用超高效液相色谱-串联质谱结合改良QuEChERS方法快速分析农产品中天然除虫菊酯6种成分残留

建立了以改良Qu ECh ERS作为前处理方法,结合超高效液相色谱-串联质谱(UPLC-MS/MS)检测农产品中除虫菊酯6种化合物残留量的检测方法。对Qu ECh ERS的净化试剂和萃取盐进行优化,最终选用0.1%醋酸乙腈和d SPE萃取盐包萃取净化。采用多重反应监测(MRM)采集模式测定,除虫菊酯的检出限可达0.2μg/kg,最低定量限可达5.0μg/kg。在0.2~5.0μg/m L内具有良好的线性相关性,R2在0.999以上。除虫菊酯在菠菜、大蒜、大姜、胡萝卜和大头菜基质中的加标回收率为85.6%~117.5%,相对标准偏差(RSD)值为0.4%~8.9%。改良的Qu ECh ERS方法前处理简单,通用性强、回收率高,可以作为检测农产品中该类农药残留的有效前处理方法。     

超高效液相色谱-串联质谱法快速筛查茶叶中的多种农药残留

目的采用超高效液相色谱-串联质谱技术(UPLC-MS/MS)和改进的Qu ECh ERS样品前处理技术,建立茶叶中多种农药残留的快速筛查检测方法。方法样品采用乙腈提取,提取液经N-丙基乙二胺(PSA)、石墨化炭黑(GCB)及茶叶农残检测专用吸附剂(TPT)混合进行分散固相萃取净化(d-SPE)。以BEH C18色谱柱(2.1 mm×100 mm,1.7μm)进行色谱分离,以电喷雾电离串联质谱多反应监测模式(MRM)进行监测。结果以欧盟农药残留参比实验室组织的茶叶中175种农药残留的国际比对考核的茶叶样品进行定性筛查和定量测定,以液相色谱质谱技术从考核茶叶样品中共定性筛查出多菌灵、吡虫清、噻嗪酮等10种农药残留。针对这10种农药进行了定量检测方法的建立和方法验证,10种农药在0.1~20μg/L的浓度范围内呈良好线性,相关系数r0.999,各农药的定量限为0.5~2.0μg/kg,茶叶样品基质的加标回收率在75.7%~105.8%之间,相对标准偏差在2.3%~18.4%之间。定量测得考核的茶叶样品中10种农药的含量在0.021~0.373 mg/kg之间。结论本方法简单、准确、灵敏度高,适用于农产品中农药多残留的快速筛查。     

QuEChERS-高效液相色谱法检测红葡萄酒中多菌灵和甲霜灵杀菌剂残留

建立了以Qu ECh ERS作为前处理方法,采用高效液相色谱(HPLC)检测红葡萄酒中多菌灵和甲霜灵的有效方法。结合考虑2种农药的性质,对Qu ECh ERS的提取盐和净化试剂进行优化,最终选用Na Cl与Na Ac为提取盐,PSA作为吸附净化剂。多菌灵和甲霜灵均在0.2~5.0mg/L范围内具有良好的线性相关性,线性系数在0.999以上。多菌灵和甲霜灵的加标回收率为85.3%~98.34%,相对标准偏差(RSD)值为3.61%~10.22%。Qu ECh ERS方法与其他常规前处理方法相比,通用性强、操作简便、成本低、提取效率高,可以作为检测红葡萄酒中该类农药残留的有效前处理方法。     

超高效液相色谱-串联质谱法测定凉茶中二十种农药残留的含量

目的建立QuEChERS结合超高效液相色谱-串联质谱法(ultra performance liquid chromatographytandem mass spectrometry,UPLC-MS/MS)测定凉茶中包括霜霉威、多菌灵、噻菌灵等20种农药残留的含量。方法 5.00 mL凉茶经过10.00 mL乙腈提取,Qu ECh ERS法萃取,经Shim-pack XR-ODSⅢ色谱柱分离,正离子扫描,多反应监测模式进行质谱分析,外标法定量。结果 20种农残在1.0~100.0 ng/mL范围内具有良好的线性关系。添加水平为5、10、20μg/L时,方法回收率为75.37%~110.21%,相对标准偏差均小于13%(n=6),杀线威、甲萘威、联苯肼酯及噻螨酮的检出限(limits of detection,LODs)为1.0μg/L,其余16种农药LODs均为0.5μg/L。结论本研究建立的方法操作简便、快速准确,适用于凉茶中20种农药残留的快速筛查和定量分析。     

超高效液相色谱-串联质谱法测定凉茶中20种农药残留的含量

目的建立QuEChERS结合超高效液相色谱-串联质谱法(ultra performance liquid chromatographytandem mass spectrometry,UPLC-MS/MS)测定凉茶中包括霜霉威、多菌灵、噻菌灵等20种农药残留的含量。方法 5.00 mL凉茶经过10.00 mL乙腈提取,Qu ECh ERS法萃取,经Shim-pack XR-ODSⅢ色谱柱分离,正离子扫描,多反应监测模式进行质谱分析,外标法定量。结果 20种农残在1.0~100.0 ng/mL范围内具有良好的线性关系。添加水平为5、10、20μg/L时,方法回收率为75.37%~110.21%,相对标准偏差均小于13%(n=6),杀线威、甲萘威、联苯肼酯及噻螨酮的检出限(limits of detection,LODs)为1.0μg/L,其余16种农药LODs均为0.5μg/L。结论本研究建立的方法操作简便、快速准确,适用于凉茶中20种农药残留的快速筛查和定量分析。     

液相色谱-高分辨质谱法快速筛查蔬菜中20种氨基甲酸酯类农药

建立蔬菜中20种氨基甲酸酯类化合物高效液相色谱-静电场轨道阱高分辨质谱分析法。样品经乙腈提取,Qu ECh ERS方法对样品净化后,采用高效液相色谱-静电场轨道阱高分辨质谱法对样品中的目标化合物进行定性分析,外标法定量确证。结果表明:20种氨基甲酸酯类农药在0.005μg/m L~0.1μg/m L范围内线性关系均良好,R2均大于0.99,且所有农药定量限(LOQ)(S/N=10)均低于国际限量要求;在0.01、0.02 mg/kg和0.04 mg/kg的添加水平下,蔬菜中20种氨基甲酸酯类农药的平均回收率介于60%~120%之间,相对标准偏差(RSD)不大于5.0%。该方法较为简单,只需全扫描并提取精确质量数即可进行准确定量,受基质干扰小,能很好的满足我国进出口蔬菜中20种农药限量的严格要求,可以用于蔬菜基质中此20种氨基甲酸酯类农药残留的检测。     

气相色谱-串联质谱法测定茶叶茶汤中多种农药残留量

目的采用Qu ECh ERS方法和气相色谱-串联质谱(gas chromatography-tandem mass spectrometry,GC-MS/MS)分析技术,建立茶叶茶汤中65种不同极性农药残留量的快速检测方法。方法利用乙腈(含1%乙酸)提取茶叶茶汤样品,分散固相萃取法净化样品,GC-MS/MS检测采用选择反应监测模式(selective reactions monitoring,SRM),灵敏度最高的离子对用作定量。结果 65种农药在3个浓度添加水平上的加标回收率范围是76%~134.6%,相对标准偏差(RSD,n=6)范围为1.0%~18.41%,茶叶样品定量限是0.15~3.0μg/kg,茶汤样品定量限是0.1~1.5μg/kg。结论该方法灵敏度高,准确性好,快速简便,适用于绿茶、乌龙茶、白茶和红茶中多种农药残留量的检测。     

抗杀螟硫磷生物素化纳米抗体的制备及其在免疫检测方法中的应用

本研究制备了一种抗杀螟硫磷生物素化纳米抗体并将其应用于免疫分析方法检测食品中杀螟硫磷残留。将杀螟硫磷人工抗原免疫羊驼,四次免疫后从外周血单核细胞获取羊驼的重链抗体可变区(VHH)基因,构建了纳米抗体基因文库,库容量为10~7 cfu。通过噬菌体表面展示技术进行四轮淘筛,得到9株不同序列的纳米抗体,优选了灵敏度最高的Nbsm6克隆。将Nbsm6基因克隆到p INQ载体中进行定向生物素化并可溶性表达与纯化,用于构建间接竞争酶联免疫分析方法。在最优工作条件下,该方法检测杀螟硫磷半抑制浓度(IC_(50))为2.0 ng/m L,线性范围(IC_(20)～IC_(80))为0.6～6.9 ng/m L,检测限(IC_(10))为0.3 ng/m L。选择白菜、生菜及橘子为样品进行添加回收实验,样品经Qu ECh ERS净化后稀释20倍可消除基质效应,添加回收率在88.9%～117.4%之间,变异系数(CV)在6.2%～16.3%之间。该方法灵敏度高,样品前处理方便,可用于杀螟硫磷的快速筛查。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the