超高效液相色谱-串联质谱法测定米粉和 河粉中的米酵菌酸

目的建立超高效液相色谱-串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry, UPLC-MS/MS)测定河粉和米粉中米酵菌酸(bongkrekic acid, BA)的含量。方法试样经提取、净化、浓缩及过滤后,以0.1%甲酸水和乙腈作为流动相进行梯度洗脱,采用电喷雾离子源负模式检测,外标法定量。基于米酵菌酸色谱和质谱行为的研究,对其仪器测定条件进行优化,并对优化后的方法进行方法学验证。结果米酵菌酸在1～100μg/L浓度范围内线性良好,相关系数大于0.999。在2种基质不同加标浓度下,回收率80.6%～104.8%,相对标准偏差小于5%。米酵菌酸在2种基质中的检出限为0.1μg/kg,定量限为0.2μg/kg。结论方法灵敏度高、专属性好、准确可靠,适用于米粉和河粉基质中米酵菌酸的测定。     

超高效液相色谱-串联质谱法测定柳州螺蛳粉中米酵菌酸

目的建立超高效液相色谱-串联质谱法测定柳州螺蛳粉中米酵菌酸的分析方法。方法样品经75%甲醇超声提取, MAX固相萃取柱净化后,经Eclipse Plus C18 RRHD(2.1 mm×50 mm, 1.8μm)色谱柱分离,以乙腈和含0.1%甲酸的10mmol/L甲酸铵溶液为流动相进行梯度洗脱,采用ESI离子源负离子模式电离,多反应监测模式检测。结果米酵菌酸在1.050～1050 ng/mL浓度范围内呈良好线性关系,方法检出限为0.01μg/kg,定量限为0.03μg/kg,平均回收率为80.4%～96.3%,相对标准偏差为1.3%～4.4%。结论建立的测定方法简易、灵敏、准确,可作为柳州螺蛳粉中米酵菌酸的测定方法。     

高效液相色谱-串联质谱法快速检测银耳中的米酵菌酸

目的建立高效液相色谱-串联质谱法(highperformanceliquidchromatography-tandemmass spectrometry,HPLC-MS/MS)快速检测银耳中的米酵菌酸的方法。方法样品以甲醇提取后,超声振荡,离心分层,上清液用甲醇定容。使用空白基质液配置标准曲线对结果进行校正。在优化后的色谱及质谱条件下,采用(electronsprayionization,ESI)负离子模式进行电离,并通过多反应监测(multi-selectedreactionmonitoring,MRM)模式对目标化合物的定量离子和定性离子进行测定。结果米酵菌酸在0.50～50.00μg/L范围内线性良好,相关系数r为0.9996,3个浓度添加水平的平均回收率范围在80.6%～95.6%之间,相对标准偏差为4.98%～7.21%。方法检出限(limit of detection, LOD)为5.0μg/kg,定量限(limit of quantification, LOQ)为15.0μg/kg。结论该方法操作简便快速,回收率高、灵敏度高、精密度好,适合测定银耳基质中的米酵菌酸。     

SPE-HPLC法快速测定食品中的米酵菌酸及其膳食风险评估

建立了固相萃取-高效液相色谱测定食品中米酵菌酸残留的方法,并评估了米酵菌酸的膳食风险水平。以米粉、银耳、玉米粉、椰子发酵饮料为研究对象,样品经过1%乙酸-乙腈（V/V）提取后,采用Poly-Sery MAX强阴离子交换柱进行净化,Athena C₁₈-WP（4.6×250 mm, 5 μm）分离,以甲醇:1%乙酸-水（80:20,V/V）为流动相,269 nm为定量波长,二级管阵列检测器分析。结果表明,在优化色谱条件下,米酵菌酸在0.01~2.0 μg/mL的质量浓度范围内线性良好,相关系数为0.9999;在4种基质中进行低、中、高3个水平加标,加标回收率在90.0%~104.0%,相对标准偏差<5%（n=6）,检出限和定量限分别为2.0、6.7 μg/kg,该方法前处理简便快速,精确灵敏,回收率高,适用于各类食品中米酵菌酸含量的准确定量分析;膳食风险评估结果表明,米酵菌酸的膳食危害商值为0.0747,远低于临界值1,对消费者的膳食安全构成威胁的概率较低。     

超高效液相色谱-串联质谱法快速测定调味料中5 种罂粟壳生物碱残留量

建立超高效液相色谱-串联质谱法（UPLC-MS/MS）测定调味料中吗啡、可待因、蒂巴因、罂粟碱、那可丁5种生物碱含量的分析方法。0.2%甲酸的乙腈提取样品,采用QuEChERS方法处理及净化,经乙酸乙酯-环己烷（2∶8,V/V）脱脂,Waters UPLC HSS T3色谱柱（1.7 μm,2.1 mm×100 mm）分离,以含0.1%甲酸10 mmol/L甲酸铵溶液-乙腈为流动相梯度洗脱,电喷雾电离正离子（ESI+）、多反应监测（MRM）模式分析测定,外标法定量。结果表明,5种生物碱5 min内出峰完全,且分离度及各峰型良好。精密度试验结果相对标准偏差（RSD）为0.43%～1.85%,平均回收率为65.7%～108.2%,RSD为1.24%～8.71%。吗啡、可待因的检出限（LOD）和定量限（LOQ）分别为3.0 μg/kg、10.0 μg/kg;蒂巴因、罂粟碱和那可丁的LOD和LOQ分别为0.6 μg/kg、2.0 μg/kg。该方法简单、快捷、准确,可用于调味料等食品中罂粟壳生物碱的定性与定量分析。     

固相萃取-超高效液相色谱-串联质谱法测定鸡蛋中甲硝唑残留

目的 优化鸡蛋中甲硝唑残留的固相萃取-超高效液相色谱-串联质谱(SPE-UPLC-MS/MS)分析检测方法。方法 样品经乙酸乙酯提取后,用MCX固相萃取小柱净化,以C18色谱柱进行分离,以0.1% 甲酸水-0.1% 甲酸甲醇溶液为流动相,梯度洗脱分离,在电喷雾ESI离子源正离子模式下,采用质谱多反应监测(MRM)模式进行定性分析,以内标法进行定量分析。结果 方法检出限(LOD)和定量限(LOQ)分别为0.02 μg/kg和0.2 μg/kg。精密度较好,在1.00 μg/L~100.00 μg/L范围内,甲硝唑的质量浓度和峰面积呈现出良好的线性关系,其相关系数为0.9996。结论 本方法简单,准确,可靠,能满足兽药残留分析的要求。     

超高效液相色谱-串联质谱法测定油料作物中8种苯胺类除草剂

建立了玉米、花生等油料作物中8种苯胺类除草剂的超高效液相色谱-串联质谱检测方法。试样经乙腈超声提取后,以N-丙基乙二胺（N-propyl ethylenediamine,PSA）和无水MgSO₄净化,ZORBAX Eclipse Plus C₁₈色谱柱（2.1 mm×100 mm,1.8 μm）分离,以甲醇（含1%乙腈）和5 mmol/L乙酸铵水溶液（含0.1%甲酸）为流动相梯度洗脱,流速为0.3 mL/min。采用电喷雾离子源（ESI）正离子模式扫描,多反应监测（MRM）模式进行检测,外标法定量。结果表明,8种苯胺类除草剂在不同浓度范围内（二甲戊乐灵、仲丁灵和磺草唑胺在2.0~200 μg/L,异丙乐灵在5.0~200 μg/L,甲磺乐灵、乙酰甲草胺、氯苯胺灵和氯草灵在0.5~200 μg/L）线性关系良好,相关系数（r）均在0.999以上,在3个不同浓度加标水平下的平均回收率为69.5%~97.5%,相对标准偏差（RSD,n=5）为0.5%~9.5%。方法的检出限（LOD,S/N=3）和定量限（LOQ,S/N=10）分别为0.07~1.20和0.23~4.00 μg/kg。该方法高效、灵敏,适用于玉米和花生等油料作物中苯胺类除草剂的快速定量检测。     

胶体金免疫层析法快速检测食品中的米酵菌酸

制备特异性识别米酵菌酸的单克隆抗体,并以胶体金标记用作示踪物,建立胶体金免疫层析快速检测方法。研究胶体金标记体系pH值、抗原、抗体质量浓度、离子强度、表面活性剂以及样品前处理方法等对胶体金层析卡性能的影响。结果表明:在最适条件下,所建立的胶体金免疫层析方法对米酵菌酸的定量检出限为1.2 μg/kg,线性范围1.8~7.2 μg/kg,定性检出限16.0 μg/kg。该方法特异性良好,与食品中常见的毒素无交叉反应,对银耳、木耳和米粉等样品的添加回收率在80.2%~101.2%之间,相对标准偏差小于6.4%,且结果与LC-MS/MS法一致。该方法具有准确、灵敏、简便、快速和低成本等特点,可以满足食品中米酵菌酸现场大批量筛查的需求。     

超高效液相色谱-串联质谱法检测婴儿米粉中11种有机磷阻燃剂

采用超高效液相色谱-串联质谱技术,建立婴儿米粉中11种有机磷阻燃剂的检测方法。样品用0.5%甲酸乙腈溶液超声提取,提取液经分散固相萃取吸附剂净化,聚四氟乙烯滤膜过滤后上机检测,5 mmol/L甲酸铵的水溶液和乙腈为流动相梯度洗脱,目标化合物在ACQUITY UPLC? BEH C₁₈ 色谱柱（100 mm×2.1 mm,1.7 μm）上实现分离,在电喷雾正离子扫描模式下进行多反应监测（MRM）,外标法定量。通过优化色谱条件,11种有机磷阻燃剂均达到了基线分离。11种有机磷阻燃剂在0.5~100 μg/L（磷酸三辛酯0.05~10 μg/L）范围内线性关系良好,相关系数r均大于0.994。检出限（3S/N）为0.003~0.926 μg/kg,定量限（10S/N）为0.01~2.78 μg/kg。婴儿米粉中低、中、高3个添加浓度水平的加标回收率为63.2%~113.4%,相对标准偏差（n=6）均小于10%。运用建立的方法分析了4种婴儿米粉,磷酸三苯酯的检出率高达100%,其中一份米粉检出了磷酸三正丁酯和磷酸三（2-氯丙基）酯。该方法简单可靠、灵敏度高、重现性好,覆盖的有机磷阻燃剂种类多,适用于婴儿米粉中痕量有机磷阻燃剂的检测。     

UPLC-MS/MS结合新型固相萃取技术快速确证猪肉中17种β-受体阻断剂

目的 建立新型固相萃取技术结合超高效液相色谱串联质谱测定猪肉中17种β-受体阻断剂的测定方法。方法 猪肉样品经酶解,乙腈沉淀蛋白并萃取后,经Oasis PRiME HLB固相萃取柱通过式净化。以甲醇和0.1%甲酸水为流动相梯度洗脱,采用迪马Endeavorsil C18色谱柱分离,ESI源正离子模式进行多反应监测(MRM),内标法定量。结果 17种β-受体阻断剂的线性范围在0.2～20 μg/L,相关系数(r)＞0.999,检出限(LOD)为0.05～0.07 μg/kg,定量限(LOQ)为0.15～0.2 μg/kg。3个加标水平下(0.2、0.4、2 μg/kg)的回收率为84.97%～123.40%,RSD为0.41%～13.94%。结论 本方法灵敏、快速、准确,可用于猪肉中β-受体阻断剂的定性、定量检测。     

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