纸质食品接触材料中多环芳烃的检测方法比较

分别采用索氏萃取法、微波萃取法和超声萃取法提取纸质食品接触材料中的多环芳烃(PAH s),对三种方法的提取效果进行了比较,发现超声萃取法的综合性能最佳。对萃取物分别进行气相色谱/质谱-选择离子监测法、气相色谱/串联质谱法和超高效液相色谱法分析,建立了三种测试方法,并对方法的线性关系、精密度、检出限等参数进行了比较。分别采用这三种方法对市售纸质食品接触材料中的PAHs含量进行测定,发现这三种测试方法所得结果之间不存在显著性差异。     

纸质食品接触材料的多环芳烃气相色谱/质谱-选择离子监测法测定

建立了一个气相色谱/质谱-选择离子监测方法,对纸质食品接触材料中18种禁用多环芳烃进行了同时测定,该方法以正己烷/丙酮(1∶1)为提取溶剂,40℃下超声提取纸质食品接触材料中的多环芳烃,提取产物经硅胶固相萃取柱净化后进行气相色谱/质谱-选择离子监测法测定,外标法定量。在S/N=3的条件下,各目标化合物的检出限为0.1~1.0μg/kg。方法的加标平均回收率为55.98~95.62%,相对标准偏差为2.87~6.98%,线性相关系数均大于0.997。该方法快速简便,定性准确,检出限低,可完全满足多环芳烃检测的技术要求,可用于食品接触材料中18种禁用多环芳烃的同时测定。采用该方法对市售食品接触材料进行测试,结果在米黄色再生包装纸袋中检出高含量的菲。     

纸质食品接触材料中18种禁用多环芳烃的快速测定

以正己烷／丙酮（1：1,V／V）为萃取溶剂,40℃下超声萃取纸质食品接触材料中的多环芳烃（PAHs）,提取产物经硅胶固相萃取柱净化后进行超高效液相色谱分析,外标法定量,从而建立了一个同时测定纸质食品接触材料中18种禁用多环芳烃的高效液相色谱方法。在信噪比（S／N）=3的条件下．各目标化合物的检出限为0．02～0．10mg／kg,其线性相关系数,均不低于0．9999。各组分的平均加标回收率为58．13％～95．86％,相对标准偏差（RSD）为1．58％～4．68％。应用该方法对市售纸质食品接触材料中的多环芳烃含量进行测定,结果在一个样品中检出高浓度的菲。该方法简便快速、灵敏度高、定性定量准确,可满足多环芳烃检测的技术要求,适用于纸质食品接触材料中多环芳烃的测定。     

GC-MS测定纺织品中多环芳烃

以甲苯为萃取溶剂,采用加速溶剂萃取方法,以外标法定量,建立了一种测定纺织品中多环芳烃(PAHs)含量的气相色谱-质谱联用法。该方法检出限为50μg/kg,工作曲线线性范围为5~500μg/L,加标回收率为86.5%~105%,相对标准偏差为1.0%~4.8%。检测结果表明,该方法简便可靠,能够达到纺织品材料中16种多环芳烃的检测需求。     

气相色谱-质谱法测定食用槟榔中多环芳烃

建立了测定食用槟榔中15种多环芳烃(PAHs)的气相色谱-质谱(GC-MS)的方法。样品经正己烷超声萃取后,采用凝胶渗透色谱(GPC)和分散固相萃取(DSPE)进行净化,用气相色谱-质谱(GC-MS)测定。在优化条件下,采用外标法测定,被测目标在线性范围内其相关系数(r2)不低于0.996,检出限为0.2 ng/m L~1.0 ng/m L;精密度(RSD,n=7)不大于4.38%,回收率试验结果满意。该方法用于食用槟榔中多环芳烃的测定是可行的。     

改进QuEChERS-气相色谱-质谱法快速分析蜂花粉中的多环芳烃

建立了蜂花粉中16种多环芳烃(PAHs)的QuEChERS快速提取、净化方法及气相色谱-质谱检测方法。蜂花粉样品经水溶解后在无缓冲体系下用乙腈萃取目标化合物,选择150 mg PSA/150 mg C18/900 mg Mg SO4/500 mg Florisil组合填料进行净化,之后,用GC-MS测定。在最优化色谱条件下,16种PAHs呈现良好的线性关系,方法检出限为0.2~3.3 ng/g,定量限为0.7~11.0 ng/g。大部分PAHs的回收率在61.0%~135.4%之间,相对标准偏差小于11.8%。改进的QuEChERS-GC/MS方法成功应用于蜂花粉(采自不同污染程度地区)PAHs的测定,结果显示不同花粉样品中PAHs种类和含量存在明显差异。本研究为蜂花粉的质量安全评价以及进一步开展蜂花粉与环境污染物之间相关性研究奠定了基础。     

气相色谱-质谱法测定醇食品模拟物中 16种多环芳烃

目的 建立固相微萃取-气相色谱-质谱联用仪测定醇食品模拟液中16种多环芳烃的分析方法。方法 优化了萃取方式、萃取温度、萃取时间、解吸时间和振荡速率等萃取条件, 样品采用气相色谱-质谱联用仪(gas chromatography-mass spectrometry, GC-MS)总离子流和选择离子模式进行定性定量测定。结果 16种多环芳烃在0.01~10 ?g/L范围内线性良好, R2大于0.99。在0.1、0.5、1.0 μg/L 3个添加水平下, 16种多环芳烃的平均回收率为76.52%?119.8%, 相对标准偏差为0.99%?15.93%。结论 该方法操作简便、灵敏度高、准确度好, 能够满足醇食品模拟物中多环芳烃化合物的检测要求。     

固相萃取-气相色谱-串联质谱法测定蔬菜中的 16种多环芳烃

目的建立固相萃取-气相色谱-串联质谱法测定蔬菜中16种多环芳烃(polycyclic aromatic hydrocarbons,PAHs)的分析方法。方法样品经正己烷-二氯甲烷匀浆提取,经中性硅胶-中性氧化铝复合固相萃取柱净化后,用多反应监测(multiple-reaction monitoring,MRM)正离子扫描方式进行检测,气相色谱-串联质谱法测定,内标法定量。结果 16种目标物在2~250 ng/m L范围内呈线性关系良好,方法的检出限(S/N=3)为0.09~0.51μg/kg,定量限(S/N=10)为0.31~1.68μg/kg。在2、5、20μg/kg 3个加标水平下的平均回收率为添加平均回收率范围为70.6%~109.2%,相对标准偏差(RSD)为1.95%~10.4%。结论该方法选择性好、抗干扰能力强,能满足国内外法规的要求,可用于蔬菜中多环芳烃残留的日常检测。     

微波萃取-GC/MS-MS测定乙二醇醚类有机溶剂

建立了气相色谱/串联质谱方法,测定纺织品中残留的15种乙二醇醚类有机溶剂。该方法以乙醇为萃取溶剂,100℃下微波萃取纺织品中残留的乙二醇醚类有机溶剂,萃取液直接进行气相色谱/串联质谱分析,外标法定量。在信噪比(S/N)为10的条件下,各组分的定量下限为5~20 mg/kg。在三个加标水平下,平均回收率为81.7%~94.5%,相对标准偏差为2.1%~6.8%。该方法简单快速,可满足纺织品中乙二醇醚类有机溶剂残留量检测的技术要求。     

高分子印迹固相萃取法测定熏烤肉制品中16 种欧盟优控多环芳烃

目的 建立高分子印记固相萃取-气相色谱质谱联用(MIPSPE-GC/MS)测定熏烤肉中 16 种欧盟优控多 环芳烃的检测方法。方法 样品经均质、超声波提取、高分子印记固相萃取柱净化后, 采用气相色谱质谱联用 仪在选择离子(SIM)扫描模式下进行测定, 内标法定量。 结果 本方法检出限为 0.07~0.24 μg/kg, 在 1~500 μg/L 范围内目标化合物具有很好的相关性, 相关系数均大于 0.999。日内及日间精密度小于 10%, 在 1、5 μg/kg 两 个加标水平下, 16 种 PAHs 回收率为 66.27 % ~ 111.61%, 相对标准偏差均小于 10%。 结论 本方法灵敏、 快速、 简便, 能满足熏烤肉制品中欧盟多环芳烃的检测要求。     

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