QuEChERS-气相色谱-串联质谱法测定鸡蛋中氟虫腈及其代谢产物

目的建立QuEChERS-气相色谱-串联质谱同时测定鸡蛋中氟虫腈及其代谢产物的方法。方法于5.0 g鸡蛋样品中加入3 ml水,加入10 ml乙腈提取,提取液经EMR-Lipids管净化。采用DB-5MS(30 m×0.25 mm,0.25μm)进行分离,多反应监测(MRM)模式进行检测,基质匹配曲线外标法定量。结果氟虫腈及其代谢产物在0～60μg/L范围内线性良好,相关系数(r)均≥0.999 0,检出限(S/N=3)为0.5～0.8μg/kg,定量限(S/N=10)为1.7～2.7μg/kg。回收率为92.0%～115.5%,相对标准偏差(RSD)为3.6%～6.8%(n=6)。结论该方法具有前处理方法简单、灵敏度高、回收率高等特点,适用于鸡蛋中氟虫腈及其代谢产物的准确检测。     

顶空-气相色谱-串联质谱法同时测定饮用水中8种挥发性卤代烃类有机物

目的建立同时测定饮用水中8种挥发性卤代烃有机物的顶空-气相色谱-串联质谱(GC-MS/MS)法。方法准确移取10 ml水样于20 ml顶空瓶中,加入1.0 g NaCl,55℃平衡30 min,进入GC-MS/MS进行分析。样品经毛细管柱HP-5MS(30 m×0.25 mm,0.25μm)分离,采用多反应监测(MRM)模式进行测定,离子峰面积定量,保留时间及特征离子对的丰度比定性。结果方法线性相关系数(r)为0.999 0～0.999 7,相对标准偏差(RSD)为1.6%～5.2%,加标回收率为85.0%～98.0%(n=6),检出限为0.005 1～0.064μg/L。结论本方法具有灵敏度高、精密度好、快速、简便、准确性高等特点,适用于饮用水中的8种挥发性卤代烃准确检测。     

分散液液微萃取结合气相色谱-四极杆/飞行时间质谱法同时测定饮料中21种邻苯二甲酸酯

目的建立分散液液微萃取(dispersiveliquid-liquidmicroextraction,DLLME)结合气相色谱-四极杆/飞行时间质谱法(gas chromatography high resolution quadrupole time of flight mass spectrometry, GC-Q-TOF/MS)同时测定饮料中21种邻苯二甲酸酯(phthalic acid esters, PAEs)的分析方法。方法样品经正丙醇分散,四氯化碳提取,氮气吹干,正己烷复溶。在该优化的色谱及质谱条件下,采用电子轰击离子源,全扫描方式采集数据,根据碎片离子的精确质量数定性定量。结果 21种邻苯二甲酸酯在5.0～1000.0μg/L范围内呈良好线性关系,相关系数r均大于0.9985,平均回收率为70.1%～109.9%,检出限为1.0～5.0μg/L,定量限为3.0～16.0μg/L,相对标准偏差为3.02%～6.68%。结论该方法具有操作简便、高效快速、回收率高、灵敏度高等优点,可用于分析测定饮料中的21种邻苯二甲酸酯。     

气相色谱/质谱法测定浓缩果汁中的邻苯二甲酸酯

建立了浓缩果汁中17种邻苯二甲酸酯的超声提取—固相萃取净化—气相色谱/质谱分析方法。样品用正己烷超声提取,经乙二胺-N-丙基硅烷(PSA)固相萃取剂净化,经VF-5MS色谱柱(30 m×0.25 mm×0.25μm)分离,运用气相色谱/质谱联用选择离子存储法(GC/MS/SIS)进行分析。结果表明:17种邻苯二甲酸酯在0.05 mg/L～10.00 mg/L范围内线性良好,相关系数均大于0.998,三个水平的样品添加回收率在80%～110%之间,精密度(RSDs)在0.5%～7.6%之间,17种目标化合物的检出限为0.01 mg/L～0.50 mg/L。该方法快速准确、背景干扰较少、分析灵敏度较高,适用于浓缩果汁中邻苯二甲酸酯的分析。     

同位素稀释凝胶渗透色谱-气相色谱-质谱法测定膳食样品中16种邻苯二甲酯类物质

建立膳食样品中16种邻苯二甲酸酯的同位素稀释凝胶渗透色谱净化(GPC)-气相色谱(GC)-串联质谱(MS)检测方法。方法 加入同位素内标的膳食样品用正己烷饱和过的乙腈超声提取,GPC净化,DB-5ms 毛细管色谱柱分离(30m×0.25mm,0.25μm),GC-MS选择离子监测模式(SIM)测定,内标法定量。结果 16种邻苯二甲酸酯在8类膳食样品中的平均添加回收率为52.3%～124.7%;RSD为1.6%～16.2%;检出限为0.03～0.06mg/kg。结论 该方法简便、灵敏、准确,适用于膳食样品中邻苯二甲酸酯的检测。     

固相萃取检测养殖水体中邻苯二甲酸酯残留

建立固相萃取-气相色谱检测水体中6种邻苯二甲酸酯类物质的方法。采用正交设计确定最佳固相萃取条件为洗脱剂正己烷-丙酮(30:1,V/V)、洗脱体积6mL、洗脱速率2mL/min、上样速率8mL/min,采用氢火焰离子化检测器的气相毛细管色谱。结果表明：邻苯二甲酸酯的检测限为1.4～3.6μg/L,线性范围在1～80mg/L之间,相关系数为0.995以上;低、高质量浓度加标回收率在72%～100%之间,相对标准偏差均小于10%。采用此方法对广东省12个水产养殖基地的养殖水进行邻苯二甲酸酯类物质测定,发现所有检测水样中均有邻苯二甲酸酯类物质残留(4.2～171.5μg/L),其污染程度与地域密切相关。     

液相色谱法测定鞋类产品中的六种邻苯二甲酸酯

建立了液相色谱法测定鞋类产品中六种邻苯二甲酸酯的分析方法,优化了仪器分析条件。结果表明：方法线性范围10～100μg/m L,方法检出限为1.87～8.92 mg/kg,加标回收率为90.5%～97.7%,相对标准偏差3.8%～6.9%。液相色谱法与气相色谱-质谱联用法同时测定样品中的六种邻苯二甲酸酯相对偏差为1.6%～5.4%。本方法无需内标物,仪器分析时间短,重复性好,结果可靠,适用于鞋类产品中六种邻苯二甲酸酯的检测。     

加速溶剂萃取-气相色谱-串联质谱法测定菊花中多种农药残留

目的建立一种加速溶剂萃取结合气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry, GC-MS/MS)同时检测菊花中123种农药残留的方法。方法样品采用乙腈提取,经加速溶剂萃取,石墨化碳/氨基固相萃取小柱净化,SH-Rxi-5SilMS (30 m×0.25 mm, 0.25μm)毛细管色谱柱分离,在气相色谱串联质谱多反应监测离子(multiple reaction monitoring, MRM)扫描模式下进行测定,基质外标法定量。结果在0.005～0.5mg/L范围内,123种农药有良好的线性关系(r~2≥0.9967),方法检出限为0.5～29.1μg/kg,定量下限为1.7～97.1μg/kg,在100、200、400μg/kg 3个添加水平下,123种农药的平均回收率在70.0%～128.8%之间,相对标准偏差(RSD)在0.5%～10.1%。结论该方法提取效率高、准确、灵敏,可应用于菊花中多种农药残留的筛查与测定。     

凝胶渗透色谱-高效液相色谱-串联质谱法测定 食品中邻苯二甲酸酯类化合物的含量

目的建立同时测定食品中6种邻苯二甲酸酯类化合物含量的高效液相色谱-串联质谱方法(HPLC-MS/MS)。方法以Agilent ZORBAX SB-C18色谱柱为分析柱,以甲醇-0.1%甲酸水为流动相,采用梯度洗脱模式,流速为0.35 m L/min;质谱离子源的工作模式为正离子电离模式(ESI+),采用多反应监测离子模式(MRM)进行定量检测;样品用有机溶剂提取,凝胶渗透色谱净化。结果食品中邻苯二甲酸丁苄酯等6种增塑剂在线性范围内线性关系良好(r20.999),定量限为0.04~0.2μg/kg,检测限为0.01~0.04μg/kg。方法的加标回收率为81.9%~103.9%,相对标准偏差均小于7.2%。结论本文所建立的方法简单,灵敏度高,适用于食品中的6种邻苯二甲酸酯类增塑剂的分析检测。     

QuEChERS-GC-MS/MS测定饮料中邻苯二甲酸酯

采用QuEChERS-气相色谱/三重四极杆质谱(GC/MS/MS)同时测定饮料中17种邻苯二甲酸酯类塑化剂。样品经正己烷提取,基质分散固相萃取净化,采用气相色谱-质谱/质谱法测定,外标法定量。17种邻苯二甲酸酯在各自的线性范围内(5μg/L~1 000μg/L)线性关系良好,线性相关系数在0.99以上,添加10、50和200μg/kg 3个不同浓度水平,含乳饮料中17种邻苯二甲酸酯的平均回收率在80.9%~108.7%,相对标准偏差在0.2%~14.2%,果汁饮料中17种邻苯二甲酸酯的平均回收率在81.4%~110.2%,相对标准偏差在1.3%~13.0%,检出限和定量下限分别为1.5μg/kg~3.0μg/kg和5.0μg/kg~10.0μg/kg。该方法灵敏度高、重现性好、结果准确可靠,适合饮料中邻苯二甲酸酯类塑化剂的检测。     

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