高效液相色谱-串联质谱法测定乳和乳制品中19种苯并咪唑类药物及其代谢物残留量

目的 建立高效液相色谱-串联质谱法测定乳和乳制品中19种苯并咪唑类药物及其代谢物残留量的方法。方法 样品采用水-乙腈溶液提取, 氯化钠盐析, 饱和正己烷脱脂净化直接稀释后, 经Atlantis T3 (4.6 mm×100 mm, 3 μm)色谱柱分离, 以乙腈-0.1%甲酸溶液为流动相, 采用电喷雾离子源质谱, 在正离子扫描方式下以多反应监测(multiple response monitoring, MRM)模式检测, 外标法定量。结果 19种苯并咪唑类药物及其代谢物在3个加标水平下的平均回收率为70.7%~110.0%, 相对标准偏差为2.3%~9.9%。在0.2~10 μg/L质量浓度范围内线性关系良好, 定量限为10~80 μg/kg。结论 该方法操作简便, 灵敏度高, 抗干扰能力强, 回收率和重复性良好, 适用于乳和乳制品中苯并咪唑类药物及其代谢物的测定。     

QuEChERS-高效液相色谱-串联质谱法快速测定鸡肉中氟虫腈及其代谢物

建立一种QuEChERS-高效液相色谱-串联质谱法,快速测定鸡肉中氟虫腈及其3种代谢产物(氟甲腈、氟虫腈砜及氟虫腈亚砜)的方法。鸡肉样品经乙腈分散,DisQuE提取管提取和DisQuE净化管净化后,采用液相色谱-串联质谱定量测定,选择性多反应监测模式检测。在0.5~20ng/mL线性范围内,氟虫腈及其代谢产物的回归方程均呈良好的线性关系,R2>0.999,在添加水平为1.0、5.0、10.0μg/kg时,平均回收率为75.2%~89.9%,相对标准偏差(RSD)为0.8%~9.2%,方法检出限为0.5μg/kg,定量限为1.0μg/kg。该方法简便快捷,灵敏度和准确度均较高,精密度较好,适用于鸡肉中氟虫腈及其代谢产物残留量的检测。     

QuEChERS-高效液相色谱-串联质谱法检测奶粉中玉米赤霉烯酮及其代谢物

建立了QuEChERS-高效液相色谱-串联质谱同时检测奶粉中玉米赤霉烯酮及其代谢产物的检测方法。样品用10 mL超纯水溶解,1%乙酸乙腈溶液提取,乙酸钠盐析,C₁₈、N-丙基乙二胺(primary secondary amine,PSA)和无水硫酸镁净化,在ZORBAX SB-C₁₈色谱柱上分离,以5 mmol/L乙酸铵溶液和乙腈作为流动相进行梯度洗脱,ESI负离子模式扫描,多反应监测(MRM)测定,β-玉米赤霉烯醇内标法定量分析。奶粉中玉米赤霉烯酮及其代谢产物在0.1~50 μg/L浓度范围内呈线性关系,相关系数均高于0.999,基质效应为抑制效应;检出限(LOD)均为0.1 μg/kg,定量限(LOQ)均为0.2 μg/kg。奶粉中玉米赤霉烯酮及其代谢产物的3个加标浓度水平的平均回收率范围为85.2%~119.3%,相对标准偏差(RSD)在0.3%~12.2%(n=7)之间。该方法简便快速、准确可靠,可用于检测奶粉中玉米赤霉烯酮及其代谢物。     

高效液相色谱串联飞行时间质谱法 快速检测饲料中多种β-受体激动剂

建立了一种快速筛查饲料样品中11种β-受体激动剂的高效液相色谱-飞行时间质谱的检测方法。样品经过酸性乙腈提取后直接进样分析。结果表明:11种β-受体激动剂得到良好的色谱分离和定性,方法的检测限和定量限分别为2μg/kg和5μg/kg,该方法在β-受体激动剂类药物的靶向和非靶向筛查检测中都有很好的应用前景。     

分散固相萃取-超高效液相色谱-串联质谱法测定农产品中螺虫乙酯及其3种代谢产物残留量

目的建立农产品中螺虫乙酯及其3种代谢产物的超高效液相色谱-串联质谱检测方法。方法样品经乙腈涡旋提取,采用乙二胺-N-丙基硅烷(primary secondary amine,PSA)和HC-C_(18)分散固相萃取剂净化,经超高效液相色谱串联质谱仪多反应监测模式检测,外标法定量。结果螺虫乙酯及其3种代谢产物在0.1~100μg/L质量浓度范围内与其呈良好的线性关系(r~20.999),检出限为0.1μg/kg,螺虫乙酯代谢产物S1定量限为1.0μg/kg,其余为0.2μg/kg,在添加水平为1.0、25、50μg/kg时,平均回收率为82.5%~99.1%,测定结果的相对标准偏差为1.3%~8.4%(n=6)。结论该方法简单、快速,重复性好,灵敏度和准确度均能满足农产品中螺虫乙酯残留量的测定。     

在线凝胶色谱-气相色谱-串联质谱法测定水果中 甲拌磷和氟虫腈及其代谢产物残留

目的采用在线凝胶渗透色谱-气相色谱-串联质谱(gel permeation chromatography-gas chromatographytandem mass spectrometry,GPC-GC-MS/MS)法结合QuEChERS方法,测定水果中甲拌磷和氟虫腈及其代谢产物残留。方法从样品提取方式、盐析剂、除水剂、净化剂的选择与用量等方面对QuEChERS方法进行优化。样品提取液过滤后,用在线GPC-GC-MS/MS方法,在多反应监测模式(multiple reaction monitoring mode,MRM)下进行检测。结果选择乙腈作为提取溶剂,氯化钠和无水硫酸镁作为盐析剂和除水剂,N-丙基乙二胺(PSA)、C_(18)填料和无水硫酸镁作为净化剂。在10、40、80μg/kg 3个加标浓度下,7种农药在夏黑葡萄、阳山水蜜桃及黄金梨样品中的回收率分别为83.5%~98.7%、80.2%~102.4%和76.5%~109.8%,检出限分别为0.29~0.85μg/kg、0.35~0.79μg/kg和0.21~0.93μg/kg,方法的相对标准偏差(relative standard deviation,RSD)为RSD≤9.4%、RSD≤7.6%和RSD≤8.9%。结论该方法具有分析时间短、样品处理简单、净化效果好、溶剂用量少等优点,适用于水果中甲拌磷和氟虫腈及其代谢产物残留的快速筛查与常规检测。     

QuEChERS-超高效液相色谱-串联质谱法同时测定水产品中20种苯并咪唑类药物及其代谢物残留

目的 建立QuEChERS结合超高效液相色谱-串联质谱法(ultra performance liquid chromatography -tandem mass spectrometry, UPLC-MS/MS)同时快速测定水产品中20种苯并咪唑类药物及其代谢物残留量的分析方法。方法 样品经乙腈提取, 用乙二胺-N-丙基甲硅烷(primary secondary amine, PSA)和中性氧化铝吸附剂净化, 通过Waters ACQUITY UPLC HSS T3 (2.1 mm×100 mm, 1.8 μm)色谱柱分离, 以0.1%甲酸水溶液-乙腈为流动相, 采用电喷雾正离子模式下, 多反应监测(multiple reaction monitoring, MRM)模式下分析, 基质匹配曲线外标法定量。结果 20种苯并咪唑类药物及其代谢物在0.05~20.00 μg/L范围内线性关系良好(r2≥0.9991), 在空白样品基质中进行3个不同浓度水平的加标实验, 平均回收率为63.3%~105.8%, 相对标准偏差为0.1%~7.5% (n=6)。方法检出限为0.1~0.5 μg/kg, 定量限为0.3~2.0 μg/kg。结论 该方法操作简便、灵敏度高、准确可靠, 适用于水产品中20种苯并咪唑类药物及其代谢物的快速筛查。     

高压液相色谱-串联质谱法检测食物中毒样品中的乌头碱

目的 建立引起食物中毒的芝麻糊中乌头碱的高压液相色谱-串联质谱(HPLC-MS/MS)测定方法。方法 样品经0.1%甲酸-2 mmol/L甲酸铵缓冲溶液振荡提取后, 离心、过滤, 以等体积比的甲醇和甲酸-甲酸铵缓冲溶液为流动相, 经C18色谱柱分离后以多反应监测质谱测定。结果 方法的线性范围为1~1000 μg/L, 线性相关系数为0.999, 最低定量浓度(LOQ)为10 μg/kg, 在50~5000 μg/kg添加水平下平均回收率为82%~94%, 相对标准偏差(RSD)为4.9%~7.4%。结论 该方法能够满足食物中毒样品中乌头碱的检测。     

高效液相色谱–串联质谱测定动物源性食品中硝基咪唑类药物及其代谢物残留量

目的 建立高效液相色谱–电喷雾电离串联四级杆质谱测定动物源性食品中甲硝唑(MNZ)、地美硝唑(DMZ)、洛硝哒唑(RNZ)3种硝基咪唑类化合物及2种代谢物羟基甲硝唑MNZOH(甲硝唑代谢物)、1-甲基-5-硝基-2-羟甲基咪唑HMMNI(地美硝唑代谢物)残留量的检测方法。方法 样品采用乙酸乙酯提取, 甲醇和正己烷分配除脂, 再经HLB固相萃取柱净化, 采用高效液相色谱–串联质谱法在选择离子监测(MRM)正离子模式(ESI+)下检测。结果 该方法在0.1~100.0 μg/L范围内具有良好的线性关系, 相关系数r >0.99。在添加水平为0.1、0.5、10.0 μg/kg时, 方法的回收率在61.1 %~108.0 %之间, 相对标准偏差为1.9 %~6.3 % ; 定量下限(S/N=10)为0.1 μg/kg。结论 该方法适合动物源性食品中硝基咪唑类药物及其代谢物残留量的检测。     

超高效液相色谱串联质谱法测定乳制品中 10种青霉素类抗生素残留

目的建立同时测定乳制品中10种青霉素类抗生素残留的超高效液相色谱-串联质谱分析方法。方法样品经乙腈提取后,乙腈饱和正己烷除去脂肪,经0.22μm微孔滤膜过滤,用乙腈-水(含0.1%甲酸5mmol/L乙酸铵)为流动相,C18柱分离,20 min内梯度洗脱分离10种青霉素;电喷雾正离子模式电离(ESI+),多反应监测模式检测(MRM),外标法定量。结果在0.1~20μg/L浓度范围内,10种青霉素类药物在各种乳制品基质中均有良好的线性关系,线性相关系数均0.999;液体乳最低检测限为0.2μg/kg~1.0μg/kg,乳粉的最低检测限1.0μg/kg~5.0μg/kg;方法回收率在70.2%~108.2%,相对标准差为15%。结论该方法测定乳制品中10种青霉素药物的残留量简便、快速、准确,可以满足对青霉素类抗生素的监测要求。     

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