QuEChERS-液质联用法测定菜籽油中7种 芳氧苯氧丙酸酯类除草剂残留备工艺研究

建立了分散固相萃取(QuEChERS)净化方法结合液质联用(HPLC-MS/MS)检测技术同时测定菜籽油中7种芳氧苯氧丙酸酯类除草剂的方法。结果表明：最优检测条件为采用90%乙腈水溶液提取2次, Supel QuE Z-Sep+分散固相萃取净化,色谱柱为sunshell C18柱（2.6 μm×2.1 mm×100 mm）,以乙腈和0.025%乙酸水溶液进行梯度洗脱,MRM模式。在最优检测条件下,除精恶唑禾草灵外6种除草剂线性范围0～100（50）μg/L,相关系数R大于0.999 5,定量限在0.25～2.5 μg/kg之间,回收率在78.3%～95.1%之间,相对标准偏差在0.9%～6.5%之间。方法具有基质效应低、处理简单、准确快速、重复性好的优点,适用于实验室高通量快速检测菜籽油样品。     

QuEChERS-液质联用法测定菜籽油中7种芳氧苯氧丙酸酯类除草剂残留

建立了分散固相萃取(QuEChERS)净化方法结合液质联用(HPLC-MS/MS)检测技术同时测定菜籽油中7种芳氧苯氧丙酸酯类除草剂的方法。结果表明:最优检测条件为采用90%乙腈水溶液提取2次,Supel QuE Z-Sep+分散固相萃取净化,色谱柱为sunshell C18柱(2.6μm×2.1 mm×100 mm),以乙腈和0.025%乙酸水溶液进行梯度洗脱,MRM模式。在最优检测条件下,除精恶唑禾草灵外6种除草剂线性范围0~100(50)μg/L,相关系数R大于0.999 5,定量限在0.25~2.5μg/kg之间,回收率在78.3%~95.1%之间,相对标准偏差在0.9%~6.5%之间。方法具有基质效应低、处理简单、准确快速、重复性好的优点,适用于实验室高通量快速检测菜籽油样品。     

QuEChERS-UPLC-MS/MS同时测定鸡肉中80种兽药残留

目的:建立一种同时测定鸡肉中包括喹诺酮类、磺胺类、β-受体激动剂类、糖皮质激素类、大环内酯类、抗病毒类药物、四环素类等在内的80种兽药的QuEChERS-超高效液相色谱—串联质谱法(UPLC-MS/MS)分析方法。方法:样品经1%甲酸乙腈水溶液提取,QuEChERS多兽药残留净化柱净化,超高效液相色谱—串联质谱(UPLC-MS/MS)多反应监测模式检测,基质标准曲线外标法定量。结果:80种兽药在特定质谱条件下响应性高,样品在质谱检测条件下检测灵敏,无杂峰干扰。80种药物质量浓度在5.0～100μg/L的范围内,线性关系良好,相关系数均大于0.99。80种兽药的方法检出限均为1.0μg/kg。样品中2.0,5.0,10.0μg/kg加标浓度的平均回收率为62.2%～106.8%,相对标准偏差为2.07%～10.85%。结论:80种药物在样品中加标回收率均符合GB/T 27404—2008《实验室质量控制规范食品理化检测》标准要求,适用于鸡肉中80种兽药残留的筛查测定。     

通过式净化-液相色谱-串联质谱快速筛查水产品中15类107种兽药多残留的方法研究

目的 建立水产品基质中15类包含107种药物多残留的快速筛查方法。方法 通过多溶剂分步提取-通过式净化, 结合液相色谱-串联质谱仪, 在MRM模式下正、负离子同时扫描监测水产品, 实现水产品中15类107种药物多残留的快速筛查, 并用于实际水产样品中药物残留含量的测定。结果 所有药物在35 min内分离良好, 方法线性范围为0.1~200 ng/mL, 相关系数均大于0.995; 检出限为0.1~5.0 μg/kg (S/N>3), 定量限为0.3~10 μg/kg (S/N>10); 回收率为40.0%~120%, 相对标准偏差均小于15%。结论 方法的准确性和灵敏度较高, 重现性好, 适合水产基质中药物多残留的高通量、快速筛查, 能够满足国家限量法规的要求。     

超高效液相色谱-串联四极杆质谱快速筛查豆芽中51种抗生素类药物的残留

使用超高效液相色谱-串联四极杆质谱仪结合快速高通量的前处理方法实现豆芽中51种抗生素类药物的快速筛查测定。样品经乙腈提取,Qu ECh ERS净化,采用ACQUITY BEH C_(18)色谱柱分离,梯度洗脱,采用电喷雾-正离子多反应监测模式,外标法定量。结果表明:51种抗生素类药物的定量限(RSN≥10)为0.5~5μg/kg,高、中、低3个添加水平平均回收率为62.93%~118.69%,相对标准偏差为0.29%~9.72%,该方法能够达到高通量、多组分、快速的筛查目的,可应用于豆芽中抗生素类药物的批量快速筛查。     

高效液相色谱串联质谱法同时测定9种龙虾中氨基糖苷类和四环素类抗生素残留

建立了龙虾中6种氨基糖苷类和3种四环素类抗生素残留的高效液相色谱串联质谱(HPLC-MS/MS)同时检测方法。样品中抗生素采用5%三氯乙酸-磷酸盐溶液提取,经超声萃取、固相萃取柱净化,C_(18)色谱柱分离,对样品前处理条件、液相色谱分离条件和质谱检测条件进行了优化。通过实际样品添加回收率实验,链霉素、双氢链霉素、四环素、金霉素和土霉素定量检出限均为5μg/kg,庆大霉素、卡那霉素、新霉素和妥布霉素定量检出限均为50μg/kg,9种抗生素三个添加水平下,龙虾样品加标回收率在66.1%~107.9%,相对标准偏差在0.7%~9.7%。结果表明,该方法准确、高效,适用于龙虾中6种氨基糖苷类和3种四环素类药物残留的同时检测和确证。     

高效液相色谱-串联飞行时间质谱高通量筛查生鲜乳中兽药残留

建立了一种高通量检测生鲜乳中兽药残留的高效液相色谱-串联飞行时间质谱方法,包括17大类兽药,共174?种。样品用乙腈和乙酸乙酯提取,冷冻净化后,目标化合物经过Poroshell 120 EC-C18柱（3.0?mm×150?mm,2.7?μm）分离,经0.1%甲酸溶液和甲醇流动相洗脱,采用电喷雾正离子模式进行采集。结果显示,114?种兽药化合物在质量浓度0～200?ng/mL范围线性良好（R2＞0.990?0）,检测限为1～10?ng/g。此外,回收率在70%～130%范围内的质控加标样品达99?种,相对标准偏差为1.03%～9.65%。该方法检测速度快、灵敏度高,大大提高了生鲜乳中兽药筛查的效率。     

超高压液相色谱-高分辨质谱法同时筛查蓝莓中90种农药残留

建立了超高压液相色谱-高分辨质谱同时筛查蓝莓中90种农药残留的方法。采用改良的QuEChERS方法提取目标物残留,超高压液相色谱-四极杆/离子回旋轨道阱高分辨质谱正负离子模式全扫描-数据依赖性碎片离子采集,代表性基质匹配标准工作曲线定量。结果显示:改良的QuEChERS净化填料中,PSA和C₁₈净化粉的用量均在150 mg时净化效果最好;方法检出限和定量限分别为0.1～18.7 μg/kg和0.2～20.2 μg/kg,90种农药在0.005～0.1 mg/kg范围内,线性关系良好,决定系数R2≥0.992;在0.01、0.05和0.1 mg/kg浓度水平进行基质添加回收实验,回收率50.1%~130.9%,相对标准偏差为1.0%～14.9%。在对实际样品的筛查中,检测到5种农药残留显示了方法的实际应用效能。本方法前处理简便、目标分析物覆盖范围广、在筛查定量基础上可同时完成高精度定性分析,可有效用于蓝莓中常用农药残留的监测。     

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。     

高效液相色谱串联质谱法同时测定9种龙虾中氨基糖苷类和四环素类抗生素残留

建立了龙虾中6种氨基糖苷类和3种四环素类抗生素残留的高效液相色谱串联质谱（HPLC-MS/MS）同时检测方法。样品中抗生素采用5%三氯乙酸-磷酸盐溶液提取,经超声萃取、固相萃取柱净化,C₁₈色谱柱分离,对样品前处理条件、液相色谱分离条件和质谱检测条件进行了优化。通过实际样品添加回收率实验,链霉素、双氢链霉素、四环素、金霉素和土霉素定量检出限均为5μg/kg,庆大霉素、卡那霉素、新霉素和妥布霉素定量检出限均为50μg/kg,9种抗生素三个添加水平下,龙虾样品加标回收率在66.1%¹07.9%,相对标准偏差在0.7%⁹.7%。结果表明,该方法准确、高效,适用于龙虾中6种氨基糖苷类和3种四环素类药物残留的同时检测和确证。      

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