吹扫捕集—气质联用测定人工皮革中的挥发性化合物

建立同时分析人工皮革中可能存在的22种挥发性有机物的分析方法。利用吹扫捕集方法富集待测组分,用气相质谱进行分离和定性定量。采用正交试验法优化吹扫捕集仪器的最佳条件,同时优化了22种组分分离的气相质谱条件;最佳条件下建立的方法的线性范围为5.0～100.0μg/mL,检测限在2.0～15.0μg/mL之间,最小检测浓度为0.004～0.025mg/m2,加标回收率高于80%,RSD(n=6)低于10.7%。     

吹扫捕集-气相色谱/质谱测定烟支挥发性成分

为了解不同卷烟挥发性成分的差异,研制了烟支挥发性成分吹扫捕集装置,通过优化吹扫捕集条件,建立了测定烟支挥发性成分的吹扫捕集-气相色谱/质谱方法,并对38个卷烟样品中检出的136种成分进行了离散度和层次聚类分析。结果表明:(1)在吹扫温度60℃、吹扫时间60 min、解吸温度190℃、吹扫流速45 m L/min条件下,实验结果较好;(2)在优化的吹扫捕集条件下,从1#样品中检出120种成分,其中101种成分的相对标准偏差(RSD)≤10%;(3)聚类分析显示,部分源于同一企业的样品较为相似,少数样品在叶组、香精香料和辅材使用方面具有明显的自身特色。     

吹扫捕集与气相色谱-质谱联用测定不同酒龄绍兴酒中挥发性醇酯类化合物

建立了吹扫捕集与气相色谱一质联用测定绍兴酒中19种挥发性醇、酯类化合物含量的方法,并对8种绍兴酒进行了检测.结果表明,酒样的加标回收率在80%～118%之间,最低检测限在0.05～3.67mg/L之间,相对标准偏差小于10%.     

吹扫捕集气相色谱-质谱法测定饮用水中 挥发性有机物

建立饮用水中55种挥发性有机物的吹扫捕集气相色谱质谱分析方法。采用吹扫捕集法对饮用水55种挥发性有机物进行富集,热解吸后导入气相色谱-质谱仪,并选用选择离子模式(SIM)进行检测。其回收率在87.90%~118.03%,其中40种化合物的两个水平回收率均在90%~110.0%范围;相对标准偏差均小于10%;进样量为5 m L时,方法的定量下限(LOQ)范围为0.006μg/L~0.123μg/L(S/N=10)。该方法且具有富集效率高、无试剂再污染等特点,适用饮用水中55种挥发性化合物的分析测定。     

生活饮用水中挥发性有机物的测定方法

本文利用吹扫捕集气相色谱质谱联用法分析生活饮用水中的微量常见挥发性有机物。结果显示10种化合物,检出限0.13～0.39μg/L,回收率75.6%～118.4%,相对标准偏差0.4%～6.4%。此方式应用于测验日常饮用水中的10种挥发性有机物效果很好,且易于操作。     

用带捕集阱的顶空进样气相/质谱联用分析水中挥发性有机化合物(VOCs)

目的:探讨带捕集阱的顶空进样气相色谱质谱联用技术分析水中挥发性有机化合物(VOCs)的方法.方法:水中微量VOCs经顶空提取后进入捕集阱被吸附,解吸后用GC/MS定性,内标法定量.同时,对EPA8260方法使用吹扫捕集进样色谱质谱联用技术的质量标准进行验证比较.结果:经实验验证的技术指标基本达到EPA8260方法使用吹扫捕集进样色谱质谱联用分析的质量标准要求.分析的64种VOCs组分的检出限有72%化合物低于或接近E PA8260方法用吹扫捕集进样的检出限,方法的相对标准偏差在0.4-15.9%之间,加标回收率在82.8-120%之间.结论:用带捕集阱顶空进样气相色谱质谱联用技术分析水中挥发性有机化合物的方法简单快捷,系统被污染机会少,适用于地下水和地表水,污水等环境水质的分析.     

P＆T—GC分析酒中的挥发性醛酮

挥发性羰基化合物是酒中重要的有害物质,为此建立了吹扫捕集-气相色谱法(P&T-GC)测定白酒和啤酒中的乙醛、丙醛、正丁醛、丁酮和丙酮.结果表明:此方法有较好的重复性,相对标准偏差在5.39%以下;检出限为1.27 ng/mL～6.55 ng/mL;5种物质的回收率在91.90%～98.24%之间.     

吹扫捕集-串联双检测器气相色谱法同时测定卷烟包装材料中的6种溶剂残留

建立了吹扫捕集与氢火焰离子化检测器和光离子化检测器串联双检测器联用的毛细管气相色谱法,测定卷烟包装材料中溶剂残留。采用正交实验法,优化了吹扫捕集的最佳条件。对卷烟包装材料中的乙醇、丙酮、乙酸乙酯、苯、4-甲基-2-戊酮、甲苯等6种溶剂残留进行了定性和定量分析。此方法对6种残留溶剂的检测限为0.054～0.688 ng,回收率为99.6%～107%,相对标准偏差为0.21%～5.74%。此方法前处理简便快速,重现性好,适用于卷烟包装材料中挥发性溶剂残留的分析。     

吹扫捕集气质联用法测定水中吡啶

建立了吹扫捕集气质联用法测定水中吡啶的方法,优化了吹扫条件,用自动进标样的方法绘制工作曲线,方法的检出限为0.08μg/L,相对标准偏差在1.5%～5.1%之间,方法用于地表水、生活污水和化工废水中吡啶的测定,进行了加标回收实验,回收率在82.5%～102.5%之间。     

吹扫捕集—GC/MS联用同时测定水中53种挥发性有机物

建立了吹扫捕集-GC/MS联用测定地表水中53种挥发性有机物的方法,方法检出限为0.04～0.20 μg/L,可满足地表水中特定有机分析项目的检测要求.     

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