液相色谱-串联质谱法测定保健食品中维生素B12

目的 建立测定保健食品中维生素B12的液相色谱-串联质谱法.方法 样品添加内标人参皂苷Re溶液,固相萃取法( SPE)对试样进行富集、净化,以甲醇(A)和纯水(B)为流动相经Bio Basic-18 PIONEER柱(150 mm×2.1 mm,5μm)梯度洗脱分离,串联离子阱质谱在电喷雾电离正离子(ESI+)-全扫描(full)-二级质谱(MS/MS)模式下按内标法测定.结果 维生素B12在50～500 ng/ml范围内具有良好的线性,相关系数r=0.992,回收率75.2％ ～ 89.5％,精密度3.6％～5.9％,检出限为5 ng/g,定量限为16 ng/g.结论本法可应用于保健食品的检测或产品质量控制.     

液质联用法检测冰粉粉中的安赛蜜

采用DGU20A-API3200型高效液相色谱—串联质谱法检测冰粉粉中的安赛蜜。建立了以ZORBAX Eclipse Plus C18 4.6×150mm3.5μm为液相色谱柱,乙腈-10mmol/L乙酸铵为流动相、流速为0.4mL/min、通过HPLC-MS/MS系统中全扫描模式对安赛蜜进行定性分析、多反应监测模式(MRM)对其进行定量分析的液相色谱-串联质谱检测方法。结果表明:安赛蜜在0ng/mL～100ng/mL范围内线性良好(R=0.9999),方法检出限为9.5μg/kg,定量限为32.0g/kg,加标回收率为93.8%～95.8%。结论:该方法操作方便、专属性强、灵敏度高、准确性高。可有效满足对冰粉粉中安赛蜜的测定。     

超高效液相色谱-串联质谱法测定保健品中的氢氯噻嗪

建立超高效液相色谱-串联质谱法(UPLC-MS/MS)负离子模式测定保健品中氢氯噻嗪的分析方法.用甲醇作为样品中氢氯噻嗪的提取液,超声提取15min,离心机10000r/min离心3min,过0.22μm聚四氟乙烯滤膜后,经C18色谱柱(50mm×2.1mm,2.6μm)分离,用乙腈与10mmol/L乙酸铵溶液为流动相...     

烟气中烟草特有亚硝胺LC-MS/MS分析方法的改进

为更加快速准确地测定不同类型卷烟烟气中TSNAs含量,进行了液相色谱串联质谱(LC-MS/MS)法测定条件改进试验。结果表明:①10 mmol/L乙酸铵水溶液可以替代100 mmol/L乙酸铵水溶液作萃取剂;②萃取液经0.45μm水相滤膜过滤后可直接进行LC-MS/MS仪分析;③同时用NNN-d4,NNK-d4,NAT-d4,NAB-d4作内标定量结果更为准确;④TSNAs的检出限为0.06~0.14 ng/mL,回收率91%~100.6%,RSD 0.76%~5.42%。该方法适用于混合型、烤烟型卷烟样品主流烟气中TSNAs的定量分析。     

液相色谱-串联质谱法测定食品包装PE材料中荧光增白剂残留量

目的建立同时测定食品包装PE材料中荧光增白剂WS、PF、OB、EBF、EGM、KCB、KSN、OB-1等8种荧光增白剂含量的检测方法。方法采用液相色谱-串联质谱法建立食品包装PE材料中8种荧光增白剂同时测定方法。食品包装PE材料中的荧光增白剂经四氢呋喃和N,N-二甲基甲酰胺提取后,采用Discovery C_(18)柱(150 mm×4.6 mm, 5μm)色谱柱,以乙腈和5 mmol/L乙酸铵-甲酸溶液作为流动相,梯度洗脱,液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry, LC-MS/MS)电喷雾电离源,正离子多反应监测模式测定,外标法定量。结果本文建立的食品包装PE材料中8种荧光增白剂检测低限均可达到0.01 mg/kg;在0.01～6.25 mg/L浓度范围内相关系数均大于0.995,线性关系良好;在0.05、0.25、1.25 mg/kg 3个浓度水平加标回收,回收率在70.8%～99.6%之间;相对标准偏差在1.56%～9.66%之间。结论该方法净化效果好、灵敏度高,且快速简便,可应用于食品包装PE材料中荧光增白剂残留量的检测分析。     

超高效液相色谱-串联质谱法同时测定配方奶粉中泛酸、生物素和氰钴胺素

建立了超高效液相色谱-串联质谱联用技术同时测定配方奶粉中泛酸、生物素和氰钴胺素的方法。样品经水溶超声提取、三氯甲烷除蛋白后,进行超高效液相色谱-串联质谱分析,采用HSS T3液相色谱柱分离,以10mmol/L乙酸铵溶液(含0.1%甲酸)和乙腈作为流动相进行梯度洗脱,采用电喷雾-正离子电离源多反应监测模式进行定性和定量分析。结果表明:泛酸(VB5)的方法定量限为5μg/100g,生物素(VB7)为2μg/100g,氰钴胺素(VB12)为0.2μg/100g;回收率为79.4%~87.8%,相对标准偏差为3.3%~5.3%。泛酸的线性范围0.5~1000ng/m L,生物素为0.2~10ng/m L,氰钴胺素为0.02~10ng/m L。该方法分析操作简单、速度快、灵敏度高、重复性好,适用于配方奶粉中泛酸、生物素和氰钴胺素的同时测定。     

改进的食品中三聚氰胺的高效液相色谱串联质谱检测法

高效液相色谱串联质谱法是测定三聚氰胺公认的标准方法,具有灵敏度高、精密度好等特点.本研究对国家标准GB/T22388-2008中液相色谱串联质谱法进行了改进,对于液态奶、奶粉和鲜蛋基质,采用50%乙腈水溶液超声提取30min,提取液经过离心处理后,用Agela ASB-C18色谱柱(150×2.1min,5μm)分离,乙腈和10mmol/L乙酸铵作为流动相(5:95),用串联质谱在多反应监测模式下定量检测.方法定量限为0.0lmg/kg,线性范围为0.01～0.5mg/L,相关系数r2>0.999.平均回收率为65%-80%,相对标准偏差为2.159%-6.68%(n=6).     

超高效液相色谱——串联质谱法同时测定血清中维生素A、维生素E

目的:建立超高效液相色谱-串联质谱(UPLC-MS/MS)同时测定血清中维生素A、E的方法。方法:取标准系列工作溶液、空白替代血清样品(4%BSA牛血清白蛋白溶液)各50μL,经硫酸锌、沉淀剂(甲醇/乙腈=50/50,V/V)沉淀蛋白,振荡,12 000 r/min离心5 min,取上清,低压离心挥干,复溶振荡,12 000 r/min离心5 min,取上清待测。采用Waters BEH Phenyl色谱(2.1 mm×100 mm,1.7μm)分离,以0.1%甲酸-水溶液和0.1%甲酸-甲醇溶液为流动相等度洗脱,电喷雾(ESI)正离子模式、多反应监测模式(MRM)下检测,内标法定量。结果:UPLC-MS/MS检测血清维生素A、α-维生素E、β-维生素E线性关系良好,相关系数分别为0.999 3、0.999 3、0.999 7;维生素A、α-维生素E、β-维生素E定量限分别为0.213、0.240、0.070 ng/m L,检出限分别为0.064、0.072、0.021 ng/m L;维生素A、E在低、高浓度加标回收率范围分别为89.7～107.4、97.6～118.1,RSD分别为2.45%～3.43%、1.48%～5.40%。结论:本研究建立的人血清维生素A、E超高效液相色谱-串联质谱法灵敏度高、准确稳定、重现性好,对血清中维生素A和维生素E的测定具很好的的应用价值。     

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,2.7μm),流动相为水相和乙腈按一定的梯度进行洗脱,流速0.5 m L/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/m L~0.0284 mg/m L范围内,L-羟脯氨酸的浓度和峰面积的线性良好,相关系数R20.99,方法的检出限和定量限分别为1.42μg/g和4.7μg/g,放置24 h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。     

液相色谱-串联质谱法测定大鼠体内凤仙萜四醇苷B血药浓度及其药动学研究

目的建立液相色谱-串联质谱法(LC-MS/MS)测定大鼠血浆样品中凤仙萜四醇苷B浓度的方法,并进行药动学研究。方法取6只大鼠,尾静脉单剂量注射凤仙萜四醇苷B 1.0 mg/kg,分别于给药前和给药后2,5,20,40,60,90,120,180 min眼眶隐静脉丛采血,采用LC-MS/MS测定其血药浓度,并采用DAS计算药动学参数。结果凤仙萜四醇苷B在大鼠体内的主要药动学参数t_(1/2z)为0.518±0.114 h,C_(2min)为159.11±9.17 ng/m L,AUC0-t为142.86±23.53 ng·h/m L。结论本方法选择性好、灵敏度好、准确度高,可为下一步该化合物临床前药动学研究提供方法学依据。     

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