气相色谱-串联质谱法测定韭菜中的氯氟氰菊酯残留

目的建立气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)测定韭菜中氯氟氰菊酯残留量的分析方法。方法将韭菜样品的乙腈提取物经石墨化碳黑/氨基混合型固相萃取柱净化、乙腈-甲苯(3:1,V:V)洗脱以及浓缩定容后进行检测。目标化合物经SLB-5MS(30 m×0.25 mm,0.25μm)色谱柱分离后,通过三重串联四级杆多反应监测模式对其进行定性定量分析。结果在添加水平为0.05~0.50mg/L(n=5)时,氯氟氰菊酯的回收率在81.7%~99.1%之间,相对标准差(RSD)在2.5%~8.7%之间。该方法的线性范围为0.05~0.50 mg/L,相关系数r~20.990,检出限为0.001 mg/kg,定量限为0.01 mg/kg。结论该方法能满足韭菜中氯氟氰菊酯残留检测的要求。     

气相色谱-质谱联用法测定水溶肥料中10种拟除虫菊酯类农药含量

目的建立气相色谱-质谱联用法测定肥料中10种拟除虫菊酯农药的分析方法。方法样品经丙酮超声提取,DB-5MS毛细管气相色谱柱分离,用气相色谱-质谱法测定。结果 10种化合物浓度在各自线性范围内与相应峰面积呈线性关系,相关系数r 0.990,加标回收率为78.12%～120.63%,精密度(relative standard deviation,RSD)为1.24%～11.91%。称样量为0.5 g时,联苯菊酯检出限为0.06 mg/kg;醚菊酯检出限为0.1mg/kg;甲氰菊酯、氯菊酯、氟胺氰菊酯检出限为0.2 mg/kg;氯氟氰菊酯、氟氯氰菊酯、氯氰菊酯、氰戊菊酯、溴氰菊酯检出限为0.4 mg/kg。结论该方法样品前处理简单、快捷,重复性及回收率均能达到检测分析要求,可以应用于水溶肥料中拟除虫菊酯农药的检测。     

PRiME HLB固相萃取结合气相色谱-串联质谱法快速测定酸笋、酸豆角中氟虫腈及其代谢物残留量

目的 建立气相色谱-串联质谱法(gas chromatography- tandem mass spectrometry, GC-MS/MS)测定酸笋、酸豆角中氟虫腈及其代谢物（氟甲腈、氟虫腈硫醚、氟虫腈砜）残留量的分析方法。方法 称取5 g样品（酸笋、酸豆角）,加入10 mL乙酸乙酯及6 g氯化钠振荡提取1 min,离心后取3 mL上清液经PRiME HLB（hydrophilic-lipophilic balanced copolymer）通过式固相萃取柱净化,残留量采用气相色谱-串联质谱法进行检测。结果 本实验建立的氟虫腈及其代谢物残留测定方法,在0.5~10.0 ng/mL线性范围内,相关系数r2均大于0.9994,4种农药分析物在各自浓度范围内均呈现良好线性关系,方法定量限均为1.0 μg/kg。在阴性酸笋、酸豆角中加入低、中、高3个添加水平,平均加标回收率及相对标准偏差分别为91.7%~100.2%、0.7%~10.2%。结论 该方法操作便捷、高效、环境友好,适合于酸笋、酸豆角中氟虫腈及其代谢物残留量的筛查。     

液相色谱-串联质谱法检测蜂蜜中氟苯尼考及其代谢物残留量

目的 建立液相色谱-串联质谱法检测蜂蜜中氟苯尼考及其代谢物残留量的分析方法。方法 样品经氨化乙酸乙酯提取,通过DPC-2固相萃取柱净化,采用Poroshell 120 EC-C18柱分离,以10 mmol/L乙酸铵溶液-乙腈为流动相进行梯度洗脱,电喷雾正/负离子切换,多反应监测模式检测,同位素内标法定量。结果 氟苯尼考在0.2～30 μg/L时具有良好的线性关系,相关系数大于0.999,检出限为0.05 μg/kg,回收率为85.5%~116.3%,相对标准偏差小于10%。氟苯尼考胺在1～30 μg/L时具有良好的线性关系,相关系数大于0.999,检出限为0.3 μg/kg,回收率为85.6%~113.5%,相对标准偏差小于10%。结论 该方法快速、准确、灵敏, 适用于蜂蜜中氟苯尼考及其代谢物残留量的测定。     

超高效液相色谱-串联质谱法测定干辣椒中2种新型杀虫剂残留量

目的 建立超高效液相色谱-串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry, UPLC-MS/MS)测定干辣椒中氰氟虫腙和氯虫苯甲酰胺残留量的分析方法。方法 干辣椒样品经乙腈匀浆提取, 氨基固相萃取小柱净化, 甲醇/水(50:50, V:V)定容, 以反相C18色谱柱(100 mm×2.1 mm, 1.7 μm)分离, 0.1%甲酸-水和甲醇作为流动相进行梯度洗脱, 多反应监测模式下进行超高效液相色谱-串联质谱测定、基质匹配标准溶液外标法定量。结果 2种新型杀虫剂在5~500 μg /L范围内线性关系良好, 相关系数均大于0.999, 定量限为0.008~0.01 mg /kg; 在高、中、低3个加标水平下的回收率为80.4%~94.9%, 相对标准偏差在0.9%~8.7%之间。结论 方法简单、快速、灵敏高、准确可靠, 可操作性强, 适合测定干辣椒中氰氟虫腙和氯虫苯甲酰胺残留量。     

饲料中11种拟除虫菊酯农药残留的检测方法

建立了一步提取三步净化法-气质联用技术检测饲料中四氟甲醚菊酯、胺菊酯、联苯菊酯、甲氰菊酯、三氟氯氰菊酯、氯菊酯、氯氰菊酯、氟氰戊菊酯、氰戊菊酯、氟胺氰菊酯、溴氰菊酯等11种拟除虫菊酯农药残留的方法。样品经乙腈-水(体积比2∶1)溶液提取,正己烷萃取,再经正己烷饱和的乙腈萃取,固相萃取三步净化过程,经DB-5MS色谱柱分离,以氦气为载气,以选择离子扫描方式(SIM)检测。结果表明,方法线性相关系数r≥0.9893,仪器定量限为0.10~5.00μg/kg。样品加标的平均回收率为82.82%~118.54%,相对标准偏差为3.11%~9.22%。     

气相色谱-质谱法同时测定三七须根中的5种杀菌剂残留

目的 建立一种气相色谱串联质谱法同时检测三七须根中5种杀菌剂残留量的方法。方法 用乙腈提取三七须根样品中的5种杀菌剂, 经氯化钠盐析, QuEChERS净化后, 利用气相色谱-质谱联法进行定性, 定量检测。结果 5种杀菌剂在0.05~5.00 μg/mL的浓度范围线性关系良好, 相关系数为0.9993~0.9998, 检出限为0.0001~0.0011 mg/kg, 高中低3种加标浓度的平均回收率为84.0%~102.5%, 相对标准偏差在2.52%~5.22% (n=5)。结论 该方法简单灵敏、高效可靠, 适用于三七根须中5种杀菌剂的快速检测。     

高效液相色谱法和高效液相色谱-串联质谱法测定水产品中的四环素类残留量

目的 建立高效液相色谱法定量测定水产品中四环素类残留量,同时采用高效液相色谱-串联质谱法进行定性确证和定量检测。方法 具体优化了缓冲提取液浓度、固相萃取柱类型、色谱条件选择等测定环节。样品经柠檬酸缓冲液提取,固相萃取柱净化后,以液相色谱-紫外检测器进行定量检测,同时也可通过高效液相色谱-串联质谱仪进行定性和定量。结果 在10~200 ng/mL范围内线性良好(r>0.999),四环素类目标物在10、50、100 μg/kg 3个水平上进行加标回收试验,回收率为76.0%~94.5%,相对标准偏差为3.9%~7.4%,高效液相色谱法检出限为5 μg/kg,液相色谱-串联质谱法检出限为1 μg/kg。结论 该方法简便、稳定、准确,适合测定水产品中的四环素类残留量。     

QuEChERS-液相色谱-串联质谱法测定南瓜中噻虫胺和氟啶虫胺腈的残留量

该研究建立了QuEChERS-液相色谱-串联质谱法同时测定南瓜中噻虫胺和氟啶虫胺腈残留量的分析方法。样品中的噻虫胺和氟啶虫胺腈经乙腈均质提取和基质分散萃取法净化,净化后的样液经0.22μm滤膜过滤后,采用液相色谱-串联质谱法测定。采用C18色谱柱分离,电喷雾离子化、正离子扫描方式和动态多反应监测模式检测,基质匹配标准溶液外标法定量。噻虫胺在2.5～100μg/L(氟啶虫胺腈在0.5～20μg/L)的范围内线性关系良好,相关系数分别为0.9994和0.9988。噻虫胺在5、10和50μg/kg(氟啶虫胺腈在1、2和10μg/kg)的3个添加水平的平均回收率在88.5%～111.2%之间,相对标准偏差(RSD,n=6)在1.12%～6.92%。噻虫胺和氟啶虫胺腈的方法定量限分别为1.0μg/kg和5.0μg/kg。该方法快速简便、灵敏度高、重现性好,可满足南瓜中噻虫胺和氟啶虫胺腈的残留检测要求。     

液相色谱-串联质谱法同时测定瓜类蔬菜及粮谷中8种农药的残留量

目的 建立液相色谱-串联质谱法同时检测GB 2763-2016中无推荐检测方法的8种农药(氟啶虫酰胺、氯噻啉、氟啶虫胺腈、氯虫苯甲酰胺、螺虫乙酯、丙硫克百威、氰氟虫腙、除虫菊素I)多残留检测方法。方法 样品以乙腈:甲酸(99:1, V:V)作为提取剂, 经QuEchERS方法前处理, 采用Kinetex C18色谱柱 (50 mm×2.1 mm, 2.6 μm, 100 ?)分离, 以乙腈和0.1%甲酸溶液为流动相梯度洗脱, 柱温为30 ℃, 流速为400 μL/min, 采用多反应监测模式检测, 外标法定量。结果 8种农药在浓度为5~200 μg/kg范围内线性关系良好, 相关系数均大于0.99。平均加标回收率率为80.5%~109.2%, 相对标准偏差为2.7%~26.3%, 8种农药的定量限为0.5~10 μg/kg, 符合残留分析的要求。结论 该方法操作简便, 适用于瓜类蔬菜及粮谷中8种农药残留量的同时测定。     

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