胶体金免疫层析法快速检测赭曲霉毒素A研究

该研究应用胶体金免疫层析技术建立一种快速检测食品和饲料中赭曲霉毒素A方法。采用柠檬酸三钠还原法制备胶体金溶液,标记抗赭曲霉毒素A单克隆抗体,标记胶体金抗体喷涂于玻璃纤维上,赭曲霉毒素A偶联抗原OTA-OVA和二抗兔抗鼠IgG分别喷涂于硝酸纤维膜上作为检测限和质控线,依次将样品垫、胶体金垫、硝酸纤维膜和吸水纸组装成试纸条并装卡。测试结果表明,赭曲霉毒素A快速检测试纸条灵敏度为5 ng/mL,检测时间为10 min,批内和批间重复性为100%,假阳性率和假阴性率均为0。该法简单方便,非常适于现场快速检测赭曲霉毒素A。     

玉米赤霉烯酮胶体金快速检测试剂板的研制

目的 应用胶体金免疫层析技术, 研制一种玉米等谷物中玉米赤霉烯酮残留免疫胶体金快速检测试剂板。方法 将制备的羊抗鼠IgG、人工结合抗原和金标抗体三者经过反复调试优化, 以适宜浓度和包被量分别包被到硝酸纤维素膜和胶体金结合垫上。包被后的硝酸纤维素膜和样品垫、胶体金结合垫、吸水垫及其他辅料组装成试纸条。结果 该试剂板的最低检测限为100 μg/kg, 整个检测过程仅15 min, 与其他霉菌毒素无交叉反应。结论 该试剂板可用于玉米赤霉烯酮残留快速检测。     

胶体金免疫层析法快速检测T-2毒素的研究

应用胶体金免疫层析技术,建立了一种快速检测谷物和饲料中T-2毒素的方法.采用柠檬酸三钠还原法制备胶体金颗粒,标记抗T-2毒素单克隆抗体并喷涂于玻璃纤维上,T-2毒素偶联抗原和羊抗鼠二抗分别喷涂于硝酸纤维素膜上,作为检测线和质控线,依次将样品垫、胶体金垫、硝酸纤维素膜和吸水垫组装成试纸条并装入检测卡中.测试结果表明,T-2毒素快速检测试纸条的检测限为0.Smg/L,检测时间为10min,假阳性率和假阴性率均为0.该法使用简单方便,非常适合现场快速检测谷物和饲料中的T-2毒素.     

用于水产品中硝基呋喃类代谢物检测的胶体金快速检测试剂板的研制

目的 本文采用胶体金免疫层析技术,研制了一种水产品中硝基呋喃代谢物四合一免疫胶体金快速检测试剂板.方法 将制备的羊抗鼠IgG、人工结合抗原和金标抗体三者经过反复调试优化,以适宜浓度和包被量分别包被到硝酸纤维素(NC)膜和微孔中.包被后的NC膜和样品垫、胶体金结合垫、吸水垫及其他辅料组装成试纸条.结果 经试验,该四合一试剂板对水产品中呋喃唑酮代谢物(AOZ)、呋喃西林代谢物(SEM)、呋喃它酮代谢物(AMOZ)和呋喃妥因代谢物(AHD)的检出限分别为1.0、1.0、1.0、2.0μg/kg.结论 试剂板具有快速、准确、灵敏度高的特点,适用于大批量水产样品中硝基呋喃代谢物的检测.     

胶体金免疫层析法快速检测赭曲霉毒素A在谷物及饲料中的研究

正应用胶体金免疫层析技术,建立一种快速检测谷物和饲料中赭曲霉毒素A的方法,其中包括胶体金的制备、金标抗体的制备、试纸条的组装和测试等步骤。测试结果表明赭曲霉毒素A快速检测试纸条对谷物类样品检测限为5 ng/m L,对饲料样品检测限为100ng/m L,检测时间为10 min,试纸条特异性好,假阳性率小于5%,假阴性率为0。该法使用简单方便,非常适合现场快速检测谷物和饲料中的赭曲霉毒     

T-2毒素胶体金免疫层析快速检测试纸条的研制

应用胶体金免疫层析技术,研制出一种快速检测T-2毒素的方法。采用柠檬酸三钠还原法制备20 nm胶体金,标记抗T-2毒素多克隆抗体并喷于玻璃纤维上,T-2毒素偶联抗原和羊抗兔二抗分别结合于硝酸纤维素膜上,经过试纸条层析条件优化,依次将样本垫、金标结合释放垫、硝酸纤维膜和吸水纸组装切割成胶体金试纸条。测试结果表明T-2毒素快速检测试纸条的灵敏度为50μg/L,检测时间为10 min,批内和批间重复性好,保存期为3个月。使用简单方便,非常适合现场快速检测T-2毒素。     

一种快速检测食用油中黄曲霉毒素B1的胶体金试剂板的研制

为建立用于快速检测粮油样品中黄曲霉毒素B1药物残留含量的胶体金免疫层析检测试剂,采用免疫竞争法,将抗黄曲霉毒素B1单克隆抗体-胶体金复合物包被在微孔中,并将人工合成的黄曲霉毒素B1抗原包被在硝酸纤维素膜(NC膜)表面作为检测线(T线).待测样品中的黄曲霉毒素B1残留物将与NC膜上的黄曲霉毒素B1抗原竞争结合胶体金标记的抗黄曲霉毒素B1单克隆抗体,并以颜色直观显示检测结果.检测食用油样品时,灵敏度可达到0.5 μg/L,仅需20 min.试验证明该检测试剂具有较高的灵敏度及很好的特异性,操作便捷,稳定可靠,可作为黄曲霉毒素B1残留现场监控的有效快速筛检手段.     

应用胶体金试纸条快速检测赭曲霉毒素A的研究

本文介绍了一种快速检测赭曲霉毒素A的胶体金试纸条的研制方法，其中包括胶体金的生产、金标抗体的制备、试纸条的组装和测试等步骤。测试结果表明赭曲霉毒素A快速检测试纸条的检测限为10ng／ml，检测时间为10min，加上使用方便，经济适用，使之适合于赭曲霉毒素A现场快速检测之用。     

胶体金免疫层析法快速检测食用油中黄曲霉毒素残留

为建立用于快速检测粮油样品中黄曲霉毒素药物残留含量的胶体金免疫层析检测试剂,我们采用免疫竞争法,将抗黄曲霉毒素单克隆抗体-胶体金复合物包被在微孔中,并将人工合成的黄曲霉毒素抗原包被在硝酸纤维素膜(NC膜)表面作为检测线(T 线)。待测样品中的黄曲霉毒素残留物将与NC膜上的黄曲霉毒素抗原竞争结合胶体金标记的抗黄曲霉毒素单克隆抗体,并以颜色直观显示检测结果。检测食用油样品时,灵敏度可达到0.5μg/L,仅需20 min。实验证明该检测试剂具有较高的灵敏度及很好的特异性,操作便捷,稳定可靠,可作为黄曲霉毒素残留现场监控的有效快速筛检手段。     

胶体金免疫层析法测定牛羊肉中掺杂鸡肉

目的建立胶体金免疫层析法快速检测牛羊肉中掺杂鸡肉的方法。方法采用柠檬酸三钠制备胶体金溶液,以真空干燥的方式制备有金标抗体的微孔试剂,将鸡IgY包被于硝酸纤维素膜(NC膜)的检测线(T线),兔抗羊抗体包被于硝酸纤维素膜(NC膜)的质控线(C线),向硝酸纤维素膜依次贴上吸水纸和样品垫,切条组装成试纸条。样品经磷酸盐处理,加入至金标抗体的微孔中,用试纸条检测,胶体金分析仪检测T/C线的颜色信号。结果该方法对牛羊肉中掺入鸡肉的检出限为3%,重复性和特异性较好,其他动物组织对其无干扰,检测时间仅需要15 min。结论该方法操作简便,具有较高的灵敏度和特异性,适用于牛羊肉中掺杂鸡肉的现场快速筛查和检测。     

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