气相色谱法同时检测含油脂食品中BHA、BHT和TBHQ的改进

选用含油脂样品,甲醇提取,采用气相色谱法检测食品中的BHA、BHT、TBHQ指标。结果发现,在浓度为0.01～0.20mg/mL时,BHA、BHT与TBHQ均呈现出较好的线性关系,其相关系数r均0.999,检出限均0.5μg/mL;检测方法回收率符合实验室测定要求,其标准偏差为1.07～3.10,相对标准差均5%。     

食品中甜蜜素定量方法的改进

建立了气相色谱法测定食品中甜蜜素的方法。固体试样经粉碎、超声提取,液体试样取样后水浴加热除去二氧化碳或酒精,反应后采用Gs BP-1毛细管柱(30 m×0.25 mm×0.25μm)分离,气相色谱测定甜蜜素,产生两个反应产物。经气质联用法确认第一个峰为环己醇亚硝酸酯,第二个峰为环己醇,随放置时间的延长,峰1的面积逐渐减小,峰2的面积逐渐增大,两个峰的面积和始终保持不变,根据两峰面积和定量,甜蜜素质量浓度在0.030~1.0 mg/m L内具有较好的线性关系,其线性回归方程为y=298.81x+1.835,相关系数(R2)为0.999 9,相对标准偏差2%,方法的检测限为0.030 g/kg,样品加标回收率为96.3%~103.5%。该方法具有操作简便、快速、准确度较好等特点,适用于食品中甜蜜素的快速测定。     

食品塑料包装中18种多环芳烃的气相色谱-质谱联用检测方法研究

建立了一种气相色谱-质谱联用法测定食品塑料包装中18种多环芳烃的检测方法,样品经超声提取和硅胶固相萃取柱净化,气相色谱-质谱联用仪测定18种多环芳烃的含量。对提取溶剂、提取温度、提取时间进行选择优化,18种多环芳烃的浓度在(0.1~5.0)mg/L范围内与色谱峰面积呈良好的线性,线性相关系数r~20.995,方法检出限为(0.010~0.056)mg/kg,在0.5、1.0、5.0 mg/kg添加水平下平均回收率分别为71.3%~84.4%,80.3%~91.5%,80.0%~95.0%,相对标准偏差分别为3.03%~7.78%、2.11%~5.70%、1.55%~4.75%,该方法应用于实际样品测定,效果满意。     

乙腈萃取-气相色谱法快速测定食用油中的3种抗氧化剂

本研究旨在建立一种快速、准确的大批量测定食用油中叔丁基羟基茴香醚(Butylated Hydroxyanisole,BHA)、2,6-二叔丁基-4-甲基苯酚(2,6-Di-tert-butyl-4-methylphenol,BHT)和特丁基对苯二酚(Tertiary Butylhydroquinone,TBHQ)含量的气相色谱法。对提取过程中的溶剂、转速和时长进行探究,选择最优提取条件,并用优化后的方法对4种食用油进行3种浓度的加标回收实验。经测定,BHA、BHT和TBHQ的质量浓度在5～100 μg/mL与其色谱峰面积呈较好的线性关系,相关系数R²达到0.999 7以上,方法检出限范围为1.8～4.8 mg/kg,重复性良好。4种食用油的3种浓度的平均加标回收率为85.0%～102.4%,相对标准偏差为1.0%～2.9%(n=6)。该方法快速、简单且试剂消耗少,可用于快速检测大批量食用油样品中的BHA、BHT和TBHQ。该方法还可以为其他样品中的不同抗氧化剂检测提供技术参考。     

气相色谱法测定饼干中的抗氧化剂BHA、BHT与TBHQ

建立了气相色谱法同时测定饼干中的3种抗氧化剂丁基羟基茴香醚（BHA）、二丁基羟基甲苯（B肿）和特丁基对苯二酚（TBHQ）含量的方法。样品采用无水乙醇提取,经净化、离心后直接进样测定。试验得出方法最低检出限BHA和BHT为1．0mg／kg,TBHQ为2．0mg／kg,3种抗氧化剂加标回收率在86．70％-103．02％之间,相对偏差均小于3％,线性范围在2μg／mL-200μg／mL之间,相关系数均大于0．999。该方法简便、快速、稳定、可靠,适用于饼干中BHA、BHT和TBHQ含量的同时快速检测。     

气相色谱-质谱联用法测定口香糖中BHA、BHT和TBHQ的探讨

利用气相色谱-质谱联用法测定口香糖中BHA、BHT和TBHQ的分析方法。样品经乙醇提取,TG-1701MS毛细管柱分离,选择离子监测模式(SIM)对目标化合物进行检测和确认。优化了样品前处理过程和色谱分离条件,建立了口香糖中BHA、BHT和TBHQ的气相色谱-质谱联用测定方法。该方法在0.05~0.5mg/m L浓度范围内,相关系数为0.9991~0.9997,方法的回收率为90.5%~98.2%,相对标准偏差为2.9%~4.9%。检出限为BHA1mg/kg,BHT0.5mg/kg,TBHQ1mg/kg。本方法净化效果好、灵敏度高、操作简单快速,适合于口香糖中BHA、BHT和TBHQ的定性和定量分析。     

高效氯氰菊酯在甘蓝中的残留行为及膳食风险评估

为了评价高效氯氰菊酯在甘蓝上的使用安全性,在陕西、福建等十二地进行了田间试验,研究高效氯氰菊酯在甘蓝中的残留及消解动态,并进行膳食风险评估.甘蓝样品采用乙腈提取,经抽滤、盐析、浓缩后,正己烷定容至5 mL,进行气相色谱检测.结果 表明:在0.01～5.00 mg/L范围内,高效氯氰菊酯质量浓度与其响应峰面积呈良好的线性...     

凝胶渗透色谱-气相色谱法测定豆芽中2,4-二氯苯氧乙酸残留量

建立了豆芽中2,4-二氯苯氧乙酸残留量的凝胶渗透色谱净化——毛细管柱气相色谱测定的方法。样品经有机溶剂提取、衍生化处理后经凝胶渗透色谱分离净化除去杂质,最后进行毛细管柱气相色谱分析。该方法的检出限为0.002mg/kg,线性范围为0.01～200μg/mL,回收率为93%～108%。     

毛细管柱气相色谱法测定食品中的甜蜜素

建立了食品中甜蜜素的毛细管柱气相色谱测定方法,对GB/T 5009.97-2003食品中甜蜜素的测定标准进行了修订。对样品前处理进行优化,食品中甜蜜素超声提取,经衍生化后,正己烷提取,离心,取上清液气相色谱法测定,毛细管柱程序升温分离,氢火焰检测器检测,保留时间定性,外标法定量。甜蜜素质量在0-5.0mg范围内与峰面积线性相关,相关系数r=0.9996,检出限为0.002g/kg,回收率为92.0-101.33%,RSD为0.24-0.39%。     

高效液相色谱法检测运动食品中的丙二醛

建立一种快速、有效的高效液相色谱法测定运动食品中丙二醛的方法。样品经三氯乙酸混合提取液提取后,与TBA在90℃温度下衍生20 min。以乙酸铵(20 mmol/L)-乙腈(30∶70,V/V)作为流动相,用荧光检测器检测,外标法峰面积定量。结果表明,丙二醛标液在0.1~4.0μg/mL浓度范围内线性良好,相关系数r~2为0.999 2,检出限为0.02 mg/kg,定量限为0.06 mg/kg。加标回收率的添加浓度为1.0,5.0和10.0 mg/kg,加标回收率达到90.4%~93.1%(n=5)。通过模拟样品酸败的过程,与过氧化值相比,丙二醛值更能反应样品的氧化程度。     

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