高灵敏度磁荧光免疫层析试纸模式构建及在呕吐毒素检测中的应用

构建基于磁荧光纳米材料的免疫层析试纸模式,弥补现在免疫层析技术的不足,为更灵敏的免疫学快速检测提供技术支撑。以呕吐毒素（deoxynivalenol,DON）为靶标,采用溶剂热法制备羧基修饰的超顺磁颗粒,碳二亚胺法将磁颗粒、绿色荧光蛋白及DON单克隆抗体进行偶联,一步法制备磁荧光抗体探针,以DON人工抗原（DON-BSA）为检测线建立磁荧光免疫层析试纸。同时用胶体金标记DON单克隆抗体,以DON-BSA为检测线建立胶体金免疫层析试纸;制备的磁荧光抗体探针具有很好的磁性、荧光特性及抗体反应性,基于该探针成功制备了DON磁荧光免疫层析试纸,该试纸回归方程为y=－0.562x＋0.921,R2=0.990,IC50为5.611 ng/mL,检出限为1.089 ng/mL;制备了DON胶体金免疫层析试纸,该试纸裸眼检测灵敏度为500 ng/mL;定量检测回归方程为y=－0.543x＋1.485,R2=0.991,IC50为65.16 ng/mL,检出限为11.94 ng/mL。DON磁荧光免疫层析试纸的灵敏度是胶体金免疫层析试纸的10.96 倍。本实验建立的磁荧光免疫层析试纸模式可以同时实现样品的富集及荧光信号检测,提高检测灵敏度,并成功用于DON的检测,为磁荧光纳米颗粒广泛应用于免疫层析领域提供参考。     

莱克多巴胺荧光微球免疫层析检测方法的建立

以荧光微球作为新型标记物,采用EDC法进行偶联,制备莱克多巴胺抗体荧光微球复合物,复合物粒度均一、性质稳定,并以之为探针建立莱克多巴胺荧光微球免疫层析检测方法,检测限为2.5ng/mL,且特异性强、检测范围宽。与胶体金免疫层析方法相比,荧光微球免疫层析方法的灵敏度更高,新型的荧光微球可以提高免疫层析方法的灵敏度。     

免疫快速同步检测玉米中五种真菌毒素胶体金试纸条的构建和应用

玉米作为重要的粮食和饲料来源，容易受到多种真菌毒素的污染，给居民健康和养殖业造成严重的危害。本文优化了适合五种真菌毒素（黄曲霉毒素B1、伏马毒素、T-2毒素、脱氧雪腐镰刀菌烯醇和玉米赤霉烯酮）同时提取的样品前处理方法，并构建了五检测线胶体金试纸条，检测结果可以通过肉眼定性，结合Image J软件可以进行定量分析，并应用于实际玉米样品检测。结果表明，最佳提取条件为90%乙腈/水，涡旋20 min，样品的添加回收率为71.9%-113.3%，相对标准偏差为0.9%-7.5%；测定基质添加样品建立标准曲线，通过肉眼判定得到五种真菌毒素的消线值分别为80.0、1000.0、100.0、400.0和200.0 μg/kg；结合Image J 软件提取多重检测试纸条的检测线灰度值，结果表明当AFB1、FB1、T-2、DON和ZEN的浓度为8.0、20.0、10.0、40.0、20.0 μg/kg时，各真菌毒素浓度对应的检测线显色值比空白对照显色值低。最后，通过检测11个实际玉米样品，结果表明部分玉米样品受到了不同程度的AFB1、DON和ZEN的污染。因此，本研究开发的免疫快速同步检测玉米中五种真菌毒素胶体金试纸条可以用于玉米中真菌毒素的现场快速筛查。     

基于磁性纳米探针的渔用麻醉剂三卡因的快速检测方法

该研究以超顺磁性纳米材料和三卡因的特异性单抗制备的磁性纳米探针作为标记物,以三卡因结构类似物3-氨基苯甲酸和牛血清蛋白的偶联复合物作为检测线(T线),以羊抗鼠IgG作为质控线(C线)构建层析试纸条,建立了一种渔用麻醉剂三卡因的快速检测方法.结果显示,该试纸条可通过肉眼观察,在5～10 min内检测鱼肉基质(2.5μg/...     

3种真菌毒素(ZEN、DON及T2)完全抗原的合成与鉴定

目的:合成玉米赤霉烯酮(ZEN)、脱氧雪腐镰刀菌烯醇(DON)和T2 3种真菌毒素的完全抗原。方法:将ZEN半抗原、DON及T2与阳离子化的载体蛋白(BSA和OVA)偶联,制备高特异性的完全抗原。用高性能基质辅助激光解吸电离-飞行时间质谱仪(MALDI-TOF)检测偶联物及载体蛋白的分子质量,用商品化的ZEN、DON和T2单克隆抗体对偶联物进行免疫滴定验证。结果:平均每个BSA偶联上的ZEN、DON和T2的分子个数分别为20.81,6.03,4.92个,平均每个OVA偶联上的ZEN、DON和T2分子个数分别为7.17,3.05,2.80个,偶联物与ZEN、DON及T2的抗体呈阳性反应。结论:合成的ZEN、DON及T2完全抗原为3种毒素抗体的制备及免疫学方法的建立奠定了基础。     

呕吐毒素/玉米赤霉烯酮一体式时间分辨荧光免疫层析定量卡的制备及应用

本文研究制备了一种建立在竞争抑制原理上的小麦和玉米中同时检测出DON毒素和ZEN毒素的时间分辨荧光免疫层析定量检测试纸条.采用铕纳米微球作为荧光探针,标记抗DON的单抗、ZEN的单抗,建立免疫层析定量方法并对其进行方法学优化及考核,DON的平均回收率在93.5％～106.5％,ZEN的平均回收率在88.9％～108.7...     

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。     

胶体金免疫层析技术测定食品中黄原胶

目的:建立一种简便实用的胶体金免疫层析检测新方法,用于食品中黄原胶的快速筛查。方法:用黄原胶抗原标准品免疫新西兰大白兔,制备得到高效价的抗黄原胶多克隆抗体;采用柠檬酸三钠还原法制备胶体金,并将其与抗黄原胶多克隆抗体标记制得金标抗体;在硝酸纤维素膜检测线上,预包被黄原胶标准抗原,质控线上包被羊抗兔IgG,采用竞争法,制成黄原胶胶体金免疫层析检测试纸条,并对试纸条的特异性、敏感性和稳定性进行了试验。结果:该试纸条检测样品的敏感性为3g/kg。结论:研制出黄原胶胶体金免疫层析试纸条及其检测方法,该方法敏感性高、特异性强、操作简便,5min可出检测结果,可用于现场大量样品的快速检测。     

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.     

量子点荧光微球免疫法定量检测小麦中黄曲霉毒素B1

摘 要: 目的 建立量子点荧光微球免疫法快速检测小麦中黄曲霉毒素B1的方法。方法 采用量子点荧光微球作为荧光标记物,与黄曲霉毒素B1的单克隆抗体偶联,构建量子点荧光微球探针。优化缓冲液pH、抗体最小标记量、荧光探针用量和包被抗原浓度等实验条件,建立检测卡上T线和C线信号峰值面积的比值与样本中黄曲霉毒素B1浓度的关系,构建定量标准曲线。针对小麦样品,将该检测方法与时间分辨荧光定量检测方法进行比较。结果 本研究建立的荧光定量免疫层析检测方法最佳反应条件为：pH 7.5磷酸钠缓冲液,抗体标记量为20 μg,荧光探针用量为4.0 μL,抗原质量浓度使用0.40 mg/mL。小麦中黄曲霉毒素B1的定量检测线性范围为0.05 μg/kg-25 μg/kg,其线性拟合方程为Y= -0.6058X + 12.523（r2=0.9994）,检出限为0.02 μg/kg,定量限为0.05 μg/kg。加标回收率在91.50%~115.00%之间,变异系数在1.88%~4.35%之间。结论 本研究建立的荧光定量免疫层析方法快速、准确、稳定性好、可靠性高,适用于小麦中黄曲霉毒素B1的现场快速检测。     

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