水产品中三聚氰胺的快速检测方法

建立高效液相色谱法快速检测水产品中三聚氰胺的方法。样品采用50%甲醇水+1%三氯乙酸(3+1)振荡提取,高速离心后过滤进行HPLC测定。三聚氰胺在0.2μg/mL～10.0μg/mL浓度范围内线性关系良好,相关系数0.9989,加标水平在0.5mg/kg～10mg/kg范围内,回收率为85%～91%,相对标准偏差4.2%～6.4%,方法的检出限为0.5mg/kg。该方法与固相萃取前处理方法相比,过程简便、快速准确。     

大米蛋白粉中三聚氰酸及其类似物的硅烷衍生化GC-MS检测方法研究

建立一种简单、快速、准确同时测定大米蛋白粉中三聚氰胺及其类似物三聚氰酸、三聚氰胺一酰胺、三聚氰胺二酰胺的方法。样品经二乙胺- 水- 乙腈(1:4:5,V/V)超声提取30min 后,提取液于70℃条件下氮气吹干,在吡啶介质中经甲基硅烷化衍生后采用气相色谱- 质谱仪测定(内标法定量)。此方法检测限为0.5mg/kg、线性相关系数(20～1000μg/L 范围内)不小于0.9989;当加标量为1.0～5.0mg/kg 时,平均回收率为72.01%～96.45%、相对标准偏差不大于6.3%。此方法可用于大米蛋白粉中三聚氰酸及其类似物的检测。     

高效液相色谱法测定植物性样品中三聚氰胺的含量

建立了高效液相色谱法检测植物性样品中三聚氰胺的方法.样品由1%三氯乙酸-乙腈超声提取,加入蛋白沉淀剂进行纯化.色谱柱ZORBAX SB-Aq(250 mm × 4.6 mm,5 μm),流动相为磷酸-三乙胺溶液,流速为0.6 mL/min检测波长为240 nm,回收率为89.8%～91.1%,相对标准偏差在0.75%～1.60%之间.     

高效液相色谱法测定肠衣中三聚氰胺

建立了用酸性氧化铝脱脂、固相萃取净化与高效液相色谱测定肠衣中三聚氰胺的检测方法.试样用三氯乙酸溶液-乙腈超声提取,酸性氧化铝脱脂后经阳离子交换固相萃取柱净化,用高效液相色谱测定,光谱定性、外标法定量.方法的线性范围为1～100mg/L ,相关系数为0.9999,检出限(S/N=10)均达到1mg/kg,在三个浓度水平(1, 5,10mg/kg)进行精密度和回收率试验,所得相对标准偏差在3.3%～4.8%之间,回收率在80%～110%之间.     

高效液相色谱法快速测定乳粉中的三聚氰胺与双氰胺

建立高效液相色谱-二极管阵列检测器同时检测乳粉中三聚氰胺和双氰胺的分析方法。采用1%三氯乙酸溶液提取样品中的三聚氰胺和双氰胺,氨基柱为分析柱,流动相为乙腈-水（75∶25,V/V）,流速1.0 mL/min,检测波长233 nm。2 种物质在0.005～60 mg/L范围内与其峰面积线性关系良好,不同添加水平的回收率在83.2%～102.6%,三聚氰胺和双氰胺的方法定量限分别为0.17、0.15 mg/kg,方法变异系数为2.3%～7.2%（n=6）。此方法操作简便、快速、成本低,适用于乳粉中三聚氰胺和双氰胺的同时检测。     

离子交换色谱-二极管阵列检测法测定食品中三聚氰胺

样品经l%三氯乙酸提取,离子交换色谱柱分离,二极管阵列检测器进行检测。实验结果表明,三聚氰胺在(0.1～10.0)μg/mL时,线性关系良好(r>0.999),在(2.5～250)mg/kg的添加水平范围内的平均回收率为98.9%～104.3%,相对标准偏差(RSD)为0.4%～4.8%,方法的检出限为1.0 mg/kg。方法简单、准确,适合食品中三聚氰胺的检测。     

基质固相分散—高效液相色谱法测定蜂蜜中三种酚类化合物

采用基质固相分散技术处理样品、反相高效液相色谱法同时测定蜂蜜中三种酚类化合物.Diamonsil C18柱,甲醇-水(体积比为45:55)流动相,检测波长275 nm.在0.04 mg/L～16.3 mg/L范围内3组分线性关系良好.方法检出限分别为0.05 mg/kg～0.06 mg/kg.回收率范围:86.88%～90.88%.相对标准偏差分别为2.25%、2.31%、2.48%.     

固相萃取-离子交换色谱法测定饲料中的三聚氰胺

建立了饲料中三聚氰胺的固相萃取-离子交换色谱检测方法.饲料样品经0.1 mol/L的盐酸溶液提取,OASIS MCX固相萃取柱净化,以pH值为3.0的0.05 moL/L磷酸二氢钾一乙腈(体积比为70:30)为流动相,Agilent ZORBAX 300-SCX离子交换色谱柱分离,二极管阵列检测器240 mm检测.该方法线性范围为0.1～5.0μg/ml,定量检出限为2.0 mg/kg,相对标准偏差为2.45%～4.15%,加标回收率为92.0%～95.5%.     

气相色谱法检测西红柿和白梨中嘧菌酯残留

建立了气相色谱法检测西红柿和白梨中嘧菌酯残留的快速分析方法.样品用乙酸乙酯 环己烷(1 1)超声波萃取,气相色谱-电子捕获检测法测定.实验结果表明,嘧茵酯在0.005mg/kg～1.0mg/kg浓度范围内呈线性,其相关系数r＞0.99.在低、中、高3个添加水平,嘧茵酯的回收率为85%/110.5%,相对标准偏差为3.89～114%检测限为0.01mg/kg.     

超高效液相色谱法测定动物源性食品中的三聚氰胺

建立动物源性食品中三聚氰胺含量测定的超高效液相色谱法。鸡蛋样品用1% 三氯乙酸- 乙腈(3:1,V/V)溶液提取、离心、固相萃取柱净化,然后采用CR 色谱柱(阳离子交换填料SCX 与C18 包被型填料按质量比1:4 混合)进行超高效液相色谱分析。兔肉样品用乙腈提取,离心后以强阳离子色谱柱进行超高效液相色谱分析。对色谱条件进行优化,选用236nm 作为检测波长,鸡蛋中三聚氰胺在浓度为1.00～5.00mg/L 的范围内线性关系良好,在添加浓度为1.00、2.00、5.00mg/kg 时,添加回收率在89.24%～91.06% 之间,RSD 小于6.00％。对于兔肉中三聚氰胺浓度在0.4～4mg/L 的范围内线性良好,在添加浓度为2.00、5.00、10.00mg/kg 时,添加回收率在82.65%～86.54% 之间,RSD 小于7.50%。该方法简便、快速,检测灵敏度、准确度及精密度均满足检测要求。     

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.     

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