茶叶中10种农药残留的液相色谱-串联质谱法和气相色谱-串联质谱法测定

建立了茶叶中啶虫脒、乐果、吡虫啉、灭多威、甲基嘧啶磷、腐霉利共6种农药残留的液相色谱-串联质谱(LC-MS/MS)测定方法和溴氰菊酯、乐果、高效氯氟氰菊酯、p,p'-滴滴伊、甲基嘧啶磷、腐霉利、哒螨灵共7种农药残留的气相色谱-串联质谱(GC-MS/MS)测定方法。其中,乐果、甲基嘧啶磷和腐霉利三种农药均能通过两种方法测定。LC-MS/MS法测定的6种农药,在5~200 μg/L范围内线性关系良好(R2>0.995),在10、50、100 μg/kg加标水平下的回收率为70.0%~105.0%,相对标准偏差为0.3%~18.7%。GC-MS/MS法测定的7种农药,在10~500 μg/L范围内线性关系良好(R2>0.996),在10、50、300 μg/kg加标水平下的回收率为82.0%~110.0%,相对标准偏差为1.8%~12.0%。该方法完善了茶叶中10种农药残留检测方法针对实际样品的检测,灵敏度满足国外限量标准要求,适合出口茶叶中农药残留的测定。     

液质法测定猪肉中八种糖皮质激素残留

建立猪肉中糖皮质激素多残留的液相色谱串联质谱(LC-MS/MS)分析方法。样品经甲醇提取,固相萃取柱净化后采用LC-MS/MS 进行检测分析。对样品前处理条件和质谱参数进行研究,这些激素的物质的线性范围均为0.5～100μg/kg。低、中、高3 种质量浓度加标回收率均为78%～101%;最低检出限为0.2～2μg/kg。该方法快速简便,灵敏度高,选择性好,测定结果令人满意,可在各食品检测机构推广应用。     

高效液相色谱-串联质谱法检测保健食品中25种非甾体类抗炎药

目的 建立高效液相色谱-串联质谱法(high performance liquid chromatography-tandem mass spectrometry, HPLC-MS/MS)分析保健食品中25种非法添加非甾体类抗炎药的分析方法。方法 保健食品固体试样经甲醇超声提取, 液体试样经水-甲醇萃取来提取, 经液相色谱柱分离后, 在多反应监测(multiple reaction monitoring, MRM)模式下测进行25种非甾体类抗炎药含量的测定, 外标法定量。结果 25种非甾体抗炎药在1~500 ng/mL范围内呈现良好线性关系, 相关系数均大于0.99, 方法检出限为1.5~2.0 μg/kg, 定量限为5.0~6.0 μg/kg, 6.0、12.0和60.0 μg/kg 3个水平平均加标回收率为80.0%~108.2%, 相对标准偏差为6.4%~9.9% (n=6)。结论 该方法针对保健食品基质, 对固体和液体样品分别采取超声萃取和液液直接萃取的提取方式, 操作简便、节约成本、专属性强且灵敏度、回收率高, 满足保健食品中非甾体类抗炎药的检测。     

高效液相色谱—串联质谱法测定油菜和油菜籽中草除灵残留量

目的：建立一种高效液相色谱—串联质谱法(LC-MS/MS)用于油菜与油菜籽内草除灵残留量的测定。方法：提取试剂为乙腈,净化柱为石墨化碳黑—氨基复合柱,色谱峰分析借助C18色谱柱,通过甲醇—乙酸铵水溶液进行梯度洗脱处理。结果：在0.01~1.00 μg/mL线性区间内,LC-MS/MS方法具有良好线性,R2值为0.999,方法检出限、定量限分别为0.008,0.027 mg/kg。当加标水平为0.03,0.06,0.15 mg/kg时,加标回收率为73.3%~91.3%,RSD为4.4%~8.1%。结论：高效液相色谱—串联质谱法(LC-MS/MS)可用来测定油菜与油菜籽内草除灵残留量。     

QuEChERS-液相串联质谱法快速测定蔬菜水果中氟吗啉和烯酰吗啉残留量

目的建立基于QuEChERS与液相串联质谱(liquidchromatographytandemmassspectrometry,LC-MS/MS)联用技术快速测定蔬菜水果中氟吗啉和烯酰吗啉残留量的分析方法。方法样品经乙腈提取后,用QuEChERS法净化, Symmetry C18色谱柱分离, LC-MS/MS外标法定量。结果方法学验证,该方法具有较高的灵敏度,氟吗啉和烯酰吗啉的检出限为0.05μg/kg,定量限为0.1μg/kg;在0.1～25μg/kg浓度范围,线性相关系数大于等于0.9963,回收率在82.4%～106.3%之间,相对标准偏差为1.5%～8.8%,该方法具有较好的回收率和良好的再现性,满足国家相关标准要求。结论该方法处理过程快速简便,灵敏度高、专属性强。     

高效液相色谱- 串联质谱法测定猪肉中10 种类固醇类激素残留

建立猪肉中类固醇类激素残留高效液相色谱- 串联质谱(LC-MS/MS)分析方法。样品经甲醇提取,固相萃取柱净化后采用LC-MS/MS 进行检测分析;并对样品前处理条件和质谱参数进行研究。结果表明：这些激素物质的线性范围均为0.5～100μg/kg;低、中、高3 种加标水平的加标回收率为71%～89%;最低检出限为0.2～2μg/kg。本方法快速简便、灵敏度高、选择性好、测定结果令人满意,可在各食品检测机构推广应用。     

液相色谱-三重四极杆质谱法测定花茶中5种吡咯里西啶类生物碱

目的 建立液相色谱-三重四极杆质谱法(liquid chromatography-tandem mass spectrometry, LC-MS/MS) 同时测定花茶中5种吡咯里西啶类生物碱含量的分析方法。方法 将花茶样品均质粉碎后, 经0.1%甲酸水溶液浸泡, 涡旋, 超声提取, 高速离心后取上清液过固相萃取柱, 洗脱液氮吹吹干后用流动相复溶, 经ZORBAX Eclipse PLUS C18色谱柱(2.1 mm×100 mm, 1.8 μm)分离, 以0.1%甲酸溶液和乙腈为流动相进行梯度洗脱, 流速为0.30 mL/min, 柱温为30 ℃, 多反应监测模式测定, 外标法定量。结果 该方法线性关系良好, 相关系数为0.997~0.998; 方法的检出限(S/N=3)为3~5 μg/kg、定量限(S/N=10)为10~15 μg/kg; 在15、30、150 μg/kg添加水平下的平均回收率为89.69%~102.12%, 相对标准偏差为0.3%~5.4%。结论 该方法样品前处理简单快速、萃取效果好、灵敏度和选择性高, 适用于常规检测。     

液相色谱-串联质谱法测定保健品中 L-羟脯氨酸含量

目的 通过优化保健品中L-羟脯氨酸的测定条件,建立保健品中L-羟脯氨酸的液相色谱-串联质谱（LC-MS/MS）定量检测的分析方法。方法 采用酸水解的方法处理L-羟脯氨酸,色谱柱（EC-C18, 4.6 mm×50 mm, 2.7 μm,安捷伦）,流动相为水相和乙腈按一定的梯度进行洗脱,流速0.5 mL/min,采用LC-MS/MS在正离子模式下检测,外标法定量。结果LC-MS/MS法在0.00284 mg/mL~0.0284 mg/mL范围内,L-羟脯氨酸的浓度和峰面积的线性良好,相关系数R2＞0.99,方法的检出限和定量限分别为1.42 μg/g和4.7 μg/g,放置24h内L-羟脯氨酸的稳定性良好,在不同添加水平下,方法的回收率范围为95.0%~98.8%,相对标准偏差为1.7%（n=9)。结论 高效液相色谱-串联质谱法灵敏度高、准确、重现性好,适用于保健品中L-羟脯氨酸的含量测定。     

LC-MS/MS法测定柚子皮中香豆素类物质组成及含量

针对6份不同品种的柚子皮,采用甲醇超声提取,Oasis HLB固相萃取柱净化,Waters XBrigde C18色谱柱分离,以乙腈和0.05 mol/L乙酸铵溶液(含0.1 %甲酸)为流动相进行梯度洗脱,采用多反应监测(multiple reaction monitoring, MRM)检测,建立液相色谱-质谱法(liquid chromatography-mass spectrometry, LC-MS/MS)测定柚子皮中香豆素类物质组成及含量的检测方法。结果表明:在0.010 μg/mL^1.0 μg/mL范围内,8种香豆素及其衍生物具有良好的线性关系(R2≥0.999 5);方法检出限在3.0 μg/kg^4.5 μg/kg,定量限在10.0 μg/kg^15.0 μg/kg;加标回收率在90.4 %~98.5 %,相对标准偏差在0.9 %~4.1 %;在柚子皮中检出7-甲基香豆素、7-甲氧基香豆素、7-乙氧基-4-甲基香豆素、醋硝香豆素,其中7-甲氧基香豆素含量较高,含量在11.4 μg/kg^123.7 μg/kg,该成分可能与柚子具有暖胃、化痰、润化喉咙等食疗作用相关,这为柚子皮综合开发利用提供参考。     

SPE结合超高效液相色谱-质谱/质谱仪测定鸡蛋中的万古霉素和去甲万古霉素残留量

建立了固相萃取法(SPE)结合超高效液相色谱-质谱/质谱仪(UPLC-MS/MS)测定鸡蛋中万古霉素和去甲万古霉素残留量的方法。样品采用0.1%甲酸水溶液进行提取,Strata-X-C固相萃取柱进行净化,UPLC-MS/MS正离子模式扫描,多反应监测模式(MRM)测定,外标法定量。结果表明:万古霉素和去甲万古霉素在5.0~100.0 μg/L浓度范围线性关系良好(r均大于0.999),检出限为2.0 μg/kg,定量限为5.0 μg/kg,加标平均回收率为85.6%~96.3%,相对标准偏差为3.7%~9.2%。该方法灵敏度高,准确度好,能满足对鸡蛋中万古霉素和去甲万古霉素定量分析的要求。     

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