赭曲霉毒素A直接竞争ELISA试剂盒的研制

在多克隆抗体的基础上研制了赭曲霉毒素A(OTA)直接竞争酶联免疫检测(cd-ELISA)试剂盒.在0 ～ 10 ng/mL范围内,该试剂盒50％抑制率(IC50)为1.09 ng/mL,检测灵敏度(IC15)为0.08 ng/mL;与赭曲霉毒素B、C的交叉反应率分别为6.28％和0.16％,而与黄曲霉毒素B1等生物毒素未见有交叉反应;板内与板间平均变异系数分别为2.21％和2.79％;花生、玉米和玉米粉3种样品中OTA的检测低限分别为1.71,1.26和1.85 μg/kg,平均添加回收率在83.80％～ 91.40％;与HPLC检测方法具有较高的相关性,相关系数(R2)分别为0.94、0.88和0.90;检测时间只需20 min,可用于花生、玉米及玉米粉中OTA的批量快速筛查.     

新型高灵敏赭曲霉毒素A间接竞争化学发光免疫分析法

建立了一种测定赭曲霉毒素A的新型高灵敏化学发光间接竞争酶联免疫分析方法。以酶标赭曲霉毒素A二抗上的辣根过氧化物酶催化过氧化脲氧化3-(4-羟苯基)丙酸,生成具有荧光的3-(4-羟苯基)丙酸二聚体。并利用乙腈介质中双[2,4,6-三氯苯基]草酸酯和过氧化脲在增强剂咪唑的作用下反应产生强化学发光,以发光强度确定待检物中赭曲霉毒素A含量。结果表明,在最佳条件下IC50为0. 55 ng/m L,在0. 05～6. 08 ng/m L范围内有良好的线性关系,最低检出限为0. 01 ng/m L。样品加标回收实验显示葡萄干和葡萄汁样品的平均回收率分别为84. 55%～91. 36%和73. 32%～87. 64%,批内与批间变异系数均小于10%,精密度良好。该新型化学发光方法检测赭曲霉毒素A时发光强度更大、发光时间更长,可用于食品中赭曲霉毒素A的高灵敏度痕量检测。     

真菌毒素在欧洲国家酿造啤酒中的感染情况

本文对欧洲国家生产的106种啤酒样品中赭曲霉毒素A、单端孢霉烯、伏马毒素和黄曲霉毒素的感染情况进行了调查。采用配有荧光检测器的高效液相色谱仪对赭曲霉毒素A和黄曲霉毒素进行分析．同时采用气质联用技术和液质联用技术分别检测单端孢霉烯和伏马毒素。任一样品中均未检出黄曲霉毒素,但在相当多的样品中检出赭曲霉毒素A、单端孢霉烯及伏马毒素,但其在所有样品中的含量都处于较低水平,欧洲不同国家之间的啤酒存在着显著差异。就赭曲霉毒素A而言,南欧的啤酒样品中含量均低于O．040μg／L,而其他欧洲国家啤酒样品中的含量明显较高．最高达到0．189μg／L（P〈O．001）,意大利啤酒中伏马毒素的含量明显更高（P=O．006）。     

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。     

利用荧光液相色谱法和羟基乙酸铅作为净化剂测定啤酒中的赭曲毒素A

提出了一种利用液相色谱分析啤酒中赭曲毒素A的新型样品处理方法。除气啤酒中加入羟基乙酸铅可以沉淀除赭曲毒素A外的大多数组分，用氯仿抽提除去沉淀的酸性液体。蒸发溶剂后的残留物溶解在流动相（乙腈：水为40：60（v／v）；磷酸调pH至3．0）中，用荧光液相色谱分离。检测限为0．005ng／mL，在0．01-0．5ng／mL的出峰范围内，平均回收率和相对标准偏差分别为95．5％和5％。这种方法比利用免疫亲和柱或固相萃取等方法便宜。优化了流动相的组成和流速，没有发现基质中有杂质干扰。用这种方法检测西班牙市场上的88种啤酒，82．9％的样品中检测出有赭曲毒素A，含赭曲毒素A的浓度范围为0．007-0．m4ng／mL。     

椰子粉、脆香米、麦提莎、葡萄干中赭曲霉毒素A的测定

本文建立HPLC—FLD测定椰子粉、脆香米、麦提莎、葡萄干中赭曲霉毒素A的方法,标准品回归曲线为0．9994,样品加标回收率在94．87％－105．3％,阳性样品测定结果RSD 1．83％,最低检出限0．28μg／kg,定量限0．92μg／kg,满足现行国家标准检测要求。     

应用超高效液相色谱结合荧光检测法测定酿造原料和啤酒中的赭曲霉毒素A

在2008～2009年,使用超高效液相色谱（UPLC）结合荧光检测法（FLD）,对237种样品的啤酒大麦、麦芽、啤酒花、麦汁和啤酒进行了赭曲霉毒素A（OTA）污染的分析。相比于其他常用的方法,UPLC法是一种具有低检测限和定量限（LOD和LOQ）的快速检测技术。啤酒的LOD和LOQ值分别为0．0003nWmL和0．001ng／mL,大麦或麦芽为0．05μg／kg和0．2μg／kg,啤酒花为0．16μg／kg和0．5μg／kg。赭曲霉毒素A在其中一种大麦样品（0．3μg／kg）,一种麦芽样品（0．7μg／kg）和一种啤酒花样品（0．6μg／kg）中被检测到,对啤酒酿造过程中的OTA含量也做了检测。此外,对从当地商店购买的国内外啤酒样品也进行了分析,OTA在其中的39％啤酒样品中被检测到,水平介于0．001～0．0544ng／mL之间,只有一个啤酒样品中OTA含量达到了0．2438ng／mL。     

外源抗坏血酸对油菜生长生理特性的影响研究

本文建立HPLC—FLD测定椰子粉、脆香米、麦提莎、葡萄干中赭曲霉毒素A的方法,标准品回归曲线为0．9994,样品加标回收率在94．87％－105．3;5,阳性样品测定结果RSDl．83％,最低检出限0．28μg／kg,定量限0．92μg／kg,满足现行国家标准检测要求。     

进口葡萄酒中赭曲霉毒素A的含量分析

为了解进口葡萄酒中赭曲霉毒素A的含量和污染状况,本研究建立了无需净化、浓缩,直接进样,采用液相色谱-串联质谱联用法(LC-MS/MS)测定葡萄酒中赭曲霉毒素A的方法。赭曲霉毒素A空白基质标准溶液在1.0～20.0 ng/mL浓度范围内线性良好,方法检测限达到0.05 ng/mL,添加浓度为2.0 ng/mL质控样品的回收率为98.7%～113.2%,精密度<5.7%。应用该方法测定了84个进口葡萄酒样品中赭曲霉毒素A的含量,结果表明,赭曲霉毒素的检出率为100%,含量为0.14～1.10 ng/mL,平均含量为0.32 ng/mL。     

赭曲霉毒素A胶体金快速检测试剂条的研制

为建立一种快速检测饲料中赭曲霉毒素A的检测方法,应用胶体金免疫层析技术,研制了一种饲料中赭曲霉毒素A的免疫胶体金快速检测试剂条.将羊抗鼠IgG、特异性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、样品垫、胶体金结合垫、吸水垫及其他辅料组装成试剂条.试剂条的最低检测限为25μg/kg,与其他霉菌毒素的交叉反应率小于1％.该试剂条可用于饲料中赭曲霉毒素A的快速检测.     

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