液相色谱-串联质谱测定乳制品中乳酸链球菌素

建立液相色谱-串联质谱法用于测定乳酸链球菌素的含量。PLRPS-S为色谱柱。样品经提取净化后,用超高效液相色谱分离后采用电喷雾串联质谱进行定性和定量检测。线性范围为0～1 000μg/L,线性相关系数r大于0.99,方法检出限为0.2 mg/kg,在加标浓度为0.2～5.0 mg/kg条件下的回收率为89.01%～104.52%,精密度为1.99%～8.77%。方法简单、灵敏、准确、精密,满足检测需求。     

高效液相色谱法分离测定湿巾中的荧光增白剂

建立高效液相色谱-二极管阵列检测法分离测定湿巾中三种荧光增白剂FWA 220、FWA 113和FWA71等物质的方法。采用Eclipse XDB-C18(4.6 mm×250 mm,5μm)色谱柱,流动相为乙腈-5 mol/L醋酸铵溶液进行梯度洗脱,检测波长为350 nm。实验结果表明,三种荧光增白剂在0.01~400.00 mg/L范围内具有良好的线性关系(相关系数均大于0.999 5),检出限和定量限分别在0.01~0.10 mg/L和0.5~5.0 mg/kg范围内。添加水平在10~800 mg/kg时,回收率范围为91.4%~102.2%,相对标准偏差(n=6)为1.6%~5.1%。该方法精密度高,重现性好,结果准确可靠,为荧光增白剂FWA220、FWA 113和FWA 71的质量评价提供了有效方法。     

超高效液相色谱-串联质谱法测定茶叶中的百草枯

文章建立了一种利用超高效液相色谱-串联质谱法测定茶叶中百苹枯含量的方法.茶叶样品使用甲醇-0.1 mol/L盐酸溶液(3:7,V/V)提取,经Poly-sery MCX柱净化后用超高效液相液相色谱-串联质谱进行测定.在5～100μg/L浓度范围内,百草枯的线性良好(R2=0.9991),方法定量限为0.01 mg/kg...     

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（150×2.1mm,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0.01mg/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2.15%～6.68%（n=6）。      

液相色谱-串联质谱法同时测定纺织品中8种荧光增白剂

建立同时测定纺织品中C.I.85、C.I.28、C.I.134、C.I.162、C.I.135、C.I.185、C.I.367、C.I.184荧光增白剂含量的液相色谱-串联质谱检测方法。试样经乙腈-水-三乙胺（体积比：89/10/1）在50℃下超声萃取,以乙腈-甲醇-10 mmol/L乙酸铵水溶液（体积比：63/27/10）为流动相,电喷雾离子源正负离子选择反应监测模式测定。结果表明：8种荧光增白剂在一定浓度范围内线性关系良好,相关系数均大于0.99,检出限：0.01 mg/kg～0.32 mg/kg,方法回收率：88.32%～97.85%,精密度（n=6）:0.72%～5.33%。该方法分析时间短、分离能力强,适用于纺织品中荧光增白剂的快速检测。     

超高效液相色谱-串联质谱法检测食用菌中 荧光增白剂

目的 建立新鲜食用菌中荧光增白剂85(VBL)、荧光增白剂71(CXT)和荧光增白剂113(BA)的超高效液相色谱-串联质谱法(UPLC-MS/MS)定量检测方法。方法 采用60 %甲醇-水溶液,75°C水浴振荡提取试样中的荧光增白剂,经弱阴离子交换固相萃取柱净化,采用UPLC-MS/MS在负离子模式下检测,内标法定量。结果 该方法在0~0.500 mg/L范围内有良好的线性关系,相关系数r2＞0.990,在空白新鲜食用菌基质中,不同添加水平下方法的平均回收率范围为80.0%~101%,相对标准偏差为3.4 %-11.9%;测定低限为0.100 mg/kg。结论 此方法灵敏度高、准确、重现性好,适用于新鲜食用菌中荧光增白剂85、荧光增白剂71和荧光增白剂113的检测。     

搅拌棒萃取-液质联用法检测大蒜中啶虫脒

建立搅拌棒吸附萃取结合液相色谱-串联质谱法检测大蒜中啶虫脒残留。样品经搅拌棒萃取,解吸液解吸后,上机检测。采用Hypersil GOLD-1.9μm,50 mm×2.1 mm(i.d)色谱柱分离,在选择反应监测模式下检测,外标法定量。啶虫脒在浓度0.005 mg/L~0.2 mg/L范围内线性关系良好,相关系数r=0.999 8,方法检测限为0.005 mg/kg。在不同添加水平下,其平均回收率为82.3%~92.2%,变异系数为7.73%~9.01%。该方法简便、快速,适用于大蒜中啶虫脒残留的批量检测。     

食品包装荧光增白剂检测方法研究进展

荧光增白剂在食品包装中的违法添加近年来引起国内外极大关注。本文综述了荧光增白剂检测方法的研究进展,分别对荧光分光光度法、紫外分光光度法、高效液相色谱法、液相色谱-串联质谱法进行介绍,并探讨这一领域存在的问题及展望未来的发展方向。      

水产品及螺旋藻片中微囊藻毒素检测方法研究

建立了超高效液相色谱-串联质谱法检测水产品及螺旋藻片中微囊藻毒素的高灵敏度色质联用快速检测方法。样品经溶剂超声提取、固相萃取净化,氮气吹至近干并定容后,通过超高效液相色谱-串联四极杆质谱仪检测。分离柱为Waters Acquity BEH C18柱(1.7μm,2.1 mm×100 mm);流动相为0.3%甲酸水溶液-乙腈;流速0.4 mL/min。4种不同基质样品中有害毒素微囊藻毒素MCYST-RR和MCYST-LR的检测限分别为0.7μg/kg和0.3μg/kg。4种不同基质样品中微囊藻毒素的回收率为80.0%～103.6%,相对标准偏差(RSD)为2.2%～14.6%(n=5),在0.01μg/mL～10μg/mL浓度范围内呈良好的线性关系,线性回归系数r2均大于0.999。     

搅拌棒萃取-LC-MS/MS法检测大蒜中苯霜灵、扑灭津、哒螨灵及吡螨胺残留

建立了搅拌棒萃取(SBSE)结合液相色谱串联质谱法检测大蒜中苯霜灵、扑灭津、哒螨灵、吡螨胺4种农药残留。样品经搅拌棒萃取,解析液解析后,上机检测,采用Hypersil GOLD-1.9μm,50 mm×2.1mm(i.d)色谱柱分离,在选择反应监测模式下检测,外标法定量。结果表明:四种农药在0.005-0.2mg/L浓度范围内线性关系良好,相关系数R2=0.9907-0.9985,方法检测限为0.005mg/kg。在不同添加水平下,其平均回收率为85.8-96.1%,变异系数为6.8-10.9%。     

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