电感耦合等离子体-质谱法测定食用藻类植物中的碘含量

建立测定海带、裙带菜、发菜、海苔、紫菜、石莼等食用藻类植物中碘含量的电感耦合等离子体-质谱法(ICP-MS)。样品用质量分数25%四甲基氢氧化铵(TMAH)溶液在密闭玻璃瓶中于90℃条件下提取3h,取上清液稀释上机,以碲作为内标,经ICP-MS测定。方法的线性范围为10～500μg/L,相关系数为r=0.9999。对裙带菜做添加回收实验,回收率在80%～120%之间,RSD小于5%,方法检出限为0.50mg/kg。本方法操作简单、灵敏度高、快速,适用于食用藻类植物中碘含量的批量化检测。     

微波消解-电感耦合等离子体发射光谱法测定食品中锡含量的方法研究

目的建立微波消解-电感耦合等离子体发射光谱法(inductively coupled plasma optical emission spectroscopy, ICP-OES)测定食品中锡含量的方法。方法采用5 m L硝酸+1 m L盐酸的酸体系对样品进行微波消解前处理,并在90℃下赶酸,再用电感耦合等离子发射光谱法以189.925 nm为分析谱线,测定食品中锡含量。结果该方法线性范围为0.01～5.00 mg/L,相关系数大于0.999。方法检出限为0.7 mg/kg,方法定量限为2.4mg/kg,多种基质样品的结果相对标准偏差5%,加标回收率在100.2%～109.4%。结论该方法操作简便快捷,结果准确,精密度高,灵敏度高,干扰少,适用于食品中锡的分析。     

HPLC-ICP-MS法测定食品中六价铬的研究

建立了一种采用高效液相色谱-电感耦合等离子体质谱法（HPLC-ICP-MS）测定食品中六价铬含量的方法,样品经氢氧化钠溶液超声振荡提取,提取液经HPLC分离,用ICPMS对六价铬进行检测。试验结果表明：添加水平为0.04~2.00mg/kg时,回收率为80.1%~105.6%,相对标准偏差（RSD）小于7.22%,该方法操作简便、灵敏度高、重现性好,适合于食品中六价铬的测定。     

电感耦合等离子体-质谱法测定居民肉类膳食中碘的方法研究

建立测定肉类膳食中碘的电感耦合等离子体-质谱法(ICP-MS),并对我国14个省份居民肉类膳食进行测定。方法 样品用四甲基氢氧化铵-双氧水溶液在60℃超声提取3h,冷冻脱脂、甲酸沉淀蛋白后,以¹²⁸Te为内标元素,ICP-MS法测定肉类膳食中碘含量。结果 方法线性范围为1～200μg/L,r=0.9998,检出限2.3μg/kg,RSD≤5.7%(n=7),加标回收率为80.0%～96.6%。结论 该方法高效、可行,适用于肉类膳食中碘的测定,为居民肉类膳食中碘含量监测工作提供技术支持。     

超声辅助氨水提取-ICP-MS法测定矿物质预混料中总碘

试验建立了电感耦合等离子体质谱(ICP-MS)测定矿物质预混料中碘元素的方法,优化了氨水浓度及超声时间等因素对提取的影响,并探讨了提取液的稳定性。结果表明,在超声40 min条件下, 20%氨水溶液可较好地提取矿物质预混料中的总碘,碘可稳定存在于提取液48 h;以103Rh作为在线内标,采用4 mL/min氦气碰撞池模式的ICP-MS法测定碘含量,碘的线性范围为0～200μg/L,线性相关系数R为0.999 8,方法检出限为0.015 mg/kg。对预混料样品加入低、中、高三个梯度标物测定,回收率在95%～105%之间,重复性RSD为2.6%,再现性RSD为1.4%, n=7。该方法准确、便捷、回收率良好,适用于不同矿物质预混料中总碘含量的测定。     

电感耦合等离子体质谱法测定预混矿物质中的碘

目的建立电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)测定预混料矿物质中碘元素。方法样品经5%氨水超声提取,通过电感耦合等离子体质谱仪,以103Rh作为在线内标,对样品溶液进行测定。结果在碘浓度为0～200μg/L的范围内,线性关系良好,线性方程为Y=8.173×10~(-4)X+1.991×10~(-4),相关系数r为0.9993。对预混料样品加入低、中、高3个梯度进行加标测定,回收率在88.6%～101.0%之间,相对标准偏差小于2.3%(n=3)。结论该方法准确、便捷、回收率良好,适用于不同预混料矿物质中碘含量的测定。     

同位素稀释电感耦合等离子体质谱法测定食品中的碘

采用同位素稀释法结合密封玻璃管的提取技术,建立了准确、灵敏的食品样品中碘的电感耦合等离子体质谱法（ID-ICP-MS）分析方法。样品中添加碲（128Te）同位素内标,以四甲基氢氧化铵（TMAH）为提取液,采用烧结玻璃试管密封,水浴振荡浸提样品中的碘,电感耦合等离子体质谱法测定,同位素稀释内标法定量。结果表明,碘在0.025 μg/L-50 μg/L范围内线性线性关系良好,相关系数为0.9999,线性方程为y=1.0506 x＋1.2511;当取样质量为0.1 g时,方法的检出限为1.8 μg/kg;在2.50、5.00和10.00 mg/kg 3个低、中、高添加水平,加标回收率在80.29%-104.70%之间,方法相对偏差小于5.0%;通过对海带标准物质GBW08517的测定,表明测定值与标准值之间无显著性差异。本方法简便、准确、灵敏度高,适用于多类食品中碘含量的测定。     

电感耦合等离子体质谱法测定学生用课业簿册中8种可迁移元素

建立电感耦合等离子体质谱法(ICP-MS法)测定学生用作业簿中8种可迁移元素的分析方法。样品经胃酸模拟物[温度为(37±2)℃、0.07mol/L的盐酸溶液]进行振荡提取,使得8种可迁移元素包括锑(Sb)、砷(As)、钡(Ba)、镉(Cd)、铬(Cr)、铅(Pb)、汞(Hg)、硒(Se)迁移于提取液中,采用电感耦合等离子体质谱法对提取液进行测定。实验结果表明:该方法在各自区间浓度范围内线性良好,相关系数均≥0.9990,检出限为0.001mg/kg～0.03mg/kg,平均回收率为91.1%～94.7%,相对标准偏差为1.2%～6.9%(n=6)。方法准确度高,选择性好、高灵敏度,具有较好的重现性和精密度,可用于学生用作业簿中8种可迁移元素的分析。     

微波消解-电感耦合等离子体质谱法测定人造奶油中铜含量

建立了人造奶油中铜含量的电感耦合等离子体质谱测定方法,试样经微波消解,以钪（Sc）为内标元素,利用电感耦合等离子体质谱仪测定。前处理方法简便,测量快速、灵敏、准确,并将检测结果与GB/T 5009.13-2003中石墨炉方法检测结果进行了比较。方法检出限为0.030mg/kg,相对标准偏差〈5%,加标回收率在86.8%～108%之间。     

高效液相色谱-电感耦合等离子体质谱法测定海洋贝类中的无机镉离子

目的建立高效液相色谱-电感耦合等离子体质谱法(high performance liquid chromatography-inductively coupled plasma mass spectrometry,HPLC-ICP-MS)检测海洋贝类中无机镉离子的分析方法。方法取一定量样品加入10 mmol/L Tris-HCl(其中加入0.1 mol/L NaCl溶液)提取液,超声萃取2h,离心过滤后至进样瓶中上机测定。流动相为30 mmol/L草酸水溶液和55 mmol/L氢氧化钾水溶液,经CS5A阳离子交换色谱柱及CG5A保护柱对镉离子进行分离,电感耦合等离子体质谱仪测定。结果该方法线性关系良好,相关系数r=0.998,且回收率在86.4%～106%之间,精密度为2.95%～5.37%,方法检出限为0.002 mg/kg,定量限为0.006 mg/kg。结论该方法准确灵敏,适合测定海洋贝类中无机镉离子。     

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.     

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     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press