基于时间分辨荧光纳米微球的黄曲霉毒素B1快速定量检测试纸条的研制及性能研究

成功研制开发了一种基于时间分辨荧光纳米微球的黄曲霉毒素B1快速定量检测试纸条,并在粮食谷物饲料等样品中对其检测性能进行了研究。该产品的最低检出限(LOD)为0.29μg/kg,最低定量限(LOQ)为0.91μg/kg,线性范围为1.00~50.00μg/kg,线性范围内的添加回收率为92.87%~121.33%,3次重复的变异系数在14.80%以内,与其它真菌毒素的交叉反应率均小于5%。其准确性和可靠性均可以满足欧盟和我国对黄曲霉毒素B1的分析标准的技术要求,且该方法具有简便快速、准确可靠、重复性好等特点,适合用于对粮食谷物饲料中黄曲霉毒素B1的进行快速定量测定。     

赭曲霉毒素A时间分辨荧光侧流层析试纸条的研究

目的 构建一种基于时间分辨荧光纳米微球的赭曲霉毒素A (ochratoxin A, OTA)侧流层析试纸条。方法 基于免疫层析原理, 以时间分辨荧光纳米微球为信号探针, 降低非特异性荧光的干扰, 提高检测灵敏度, 并通过优化样品提取液和样品稀释液, 进一步提高现场检测OTA的灵敏度和准确性。结果 OTA在1~50 μg/kg范围内, T线和C线荧光强度的比值与OTA浓度的对数值具有良好的线性关系, 相关系数r2为0.9981~0.9998。不同基质中OTA的检出限(limit of detection, LOD)和定量限(limit of quantitation, LOQ)分别为0.401 μg/kg~0.614 μg/kg和0.970 μg/kg~1.617 μg/kg, 加标回收率为89.53%~118.37%, 相对标准偏差(relative standard deviations, RSDs)小于12% (n=3), 且与呕吐毒素、伏马菌素B1、黄曲霉毒素B1、玉米赤霉烯酮和T-2毒素的交叉反应率均小于5%, 特异性良好。基于荧光定量快速检测技术平台OTA侧流层析试纸条可在8 min内快速准确地定量检测出待测样本中OTA的含量。结论 本研究所制备的时间分辨荧光侧流层析试纸条可实现玉米、小麦和饲料中OTA的快速定量检测, 并具有成本低、灵敏度高、操作简便、准确高、重复性好、特异性好的优点, 可满足国内外OTA检测的技术要求, 为真菌毒素快检技术的发展提供技术支撑。     

荧光免疫定量法即时检测谷物中黄曲霉毒素B1

目的 基于时间分辨荧光免疫层析技术,研制快速定量检测试纸条,用于粮谷物中黄曲霉毒素B1的检测。方法 以荧光微球为标记物,采用DNP独立质控体系和竞争法检测原理,构建了粮谷物中黄曲霉毒素B1荧光免疫定量即时检测（point-of-care testing ,POCT）方法。评价其准确度、重复性、特异性、与仪器确证方法符合度。结果 该方法最适条件为：pH7.8硼酸盐（BB）活化,pH7.5磷酸盐（PB）偶联,微球抗体质量比为5:4,抗原抗体质量比为50:1。检测限在0.299 ng/g -0.997 ng/g之间,定量限在0.544 ng/g -2.663 ng/g。代表性样本准确度为92.2%-111%,重复性为3.2%-7.5%。除与黄曲霉毒素B2有交叉反应（6.1%）,与其他类似物无（<0.1%）。该法检测结果与仪器确证法一致性好,在-12.5%—15.9%之间。结论 提供了一种准确、快速、定量、灵敏、便捷、适合现场检测粮谷物中黄曲霉毒素B1的时间分辨荧光免疫检测试纸条。     

脱氧雪腐镰刀菌烯醇时间分辨荧光免疫检测体系适用性评价

目的研究已建立的脱氧雪腐镰刀菌烯醇时间分辨荧先兊疫定量检测体系(包括脱氧雪腐镰刀菌烯醇时间分辨荧先兊疫层析检测卡和荧先定量检测仪)的适用性。方法检测20个阴性样本中脱氧雪腐镰刀菌烯醇含量,确定该检测体系的检出限和定量限;对6组含不同浓度脱氧雪腐镰刀菌烯醇的小麦阳性样本和6组含不同浓度脱氧雪腐镰刀菌烯醇的玉米阳性样本进行检测,确定方法的准确性和台间差;重复6次检测含中等浓度脱氧雪腐镰刀菌烯醇的阳性样本和连续12 h检测国家检测限浓度的阳性样本,确定系统的重复性和稳定性。结果该体系的检出限为154μg/kg,定量限为414μg/kg,幵且检测结果与液质联用方法定值结果无显著性差异,仪器台间差无显著差异;测值的精密度未超过国家标准规定要求。结论本研究验证的时间分辩荧先定量检测体系能准确检测玉米和小麦样本中脱氧雪腐镰刀菌烯醇含量。     

赭曲霉毒素A时间分辩荧光定量检测体系适用性评价

目的验证赭曲霉毒素A(ochratoxin A,OTA)时间分辨荧光免疫定量检测体系对谷物中赭曲霉毒素A快速检测的适用性。方法该时间分辨荧光免疫定量检测体系包括时间分辨荧光免疫层析检测卡和时间分辩荧光定量检测仪。时间分辨荧光速测仪内置标准曲线,直接得出待测样品中赭曲霉毒素A的含量。对待测样品进行低、中、高3个浓度添加,每个浓度分为7份,由不同人员检测。同时,对实际阳性样品进行检测。结果对谷物做赭曲霉毒素A添加回收率实验,回收率在98%~113%之间;批内变异系数15%。在实际样品的检测中,时间分辨荧光定量检测卡得出的数值,与质控样本标识的值没有显著性差异。结论时间分辨荧光定量检测系统检测快速、准确,稳定、检测设备小型化、联网可实现数据上传,适用于大批量谷物样品的快速检测和风险评估。     

酶联免疫吸附法测定植物油中黄曲霉毒素B1

目的对酶联免疫吸附法(enzyme-linked immunosorbent assay,ELISA)快速检测植物油中黄曲霉毒素B_1进行方法验证,考查植物油中黄曲霉毒素B_1污染情况。方法对酶联免疫吸附法检测植物油中黄曲霉毒素B_1进行了准确性与回收率、重复性、复现性等方法学实验。用验证后的试剂盒检测156份植物油中黄曲霉毒素B_1含量。结果酶联免疫吸附法的回收率在102.8%~113.8%,相对标准偏差为2.0%~6.1%,重复性相对标准偏差为4.3%,复现性相对标准偏差为7.1%和7.6%。156份植物油中黄曲霉毒素B_1检出率为60.90%,其中山茶油的检出率为78.38%,高于平均水平。结论试剂盒检测植物油稳定性较好,定量准确。156份植物油中黄曲霉毒素B_1含量均符合国家标准,花生油中黄曲霉毒素B_1检出浓度最高,其次是玉米油。茶油的加工生产过程可能存在污染黄曲霉毒素B_1的情况,应注意加工过程中黄曲霉毒素B_1的污染。     

光化学衍生-高效液相色谱法测定大米中黄曲霉毒素B_1含量

建立了一种测定大米中黄曲霉毒素B_1含量的光化学衍生-高效液相色谱方法:试样经乙腈与水的混合液(体积比84:16)提取,多功能净化柱净化、浓缩、高效液相色谱分离,在线光化学柱后衍生,荧光检测器检测,外标法定量,在优化的条件下,黄曲霉毒素B_1的浓度分别为1.0~40.0μg/L时,浓度与峰面积线性关系良好,相关系数0.9996;加标浓度为5~10μg/kg,样品回收率为80.9%~98.7%,平行相对偏差为3.87%,该方法简单快速、灵敏度高、重现性好,用于大米中黄曲霉毒素B_1的测定,效果更好。     

黄曲霉毒素B1荧光定量检测试纸条性能评估测试

对上海飞测生物科技有限公司研发生产的黄曲霉毒素B1荧光定量检测试纸条在粮食谷物饲料中的检测性能进行了评估。该产品的最低检出限(LOD)为0.29μg/kg,最低定量限(LOQ)为0.91μg/kg,线性范围为1.00~50.00μg/kg,线性范围内的添加回收率为92.89%~121.07%,3次重复的变异系数在14.56%以内。与其它真菌毒素的交叉反应率均小于5%。该产品具有操作简便、灵敏准确、快速定量、重现性好等优点,适合用于对粮食谷物饲料中黄曲霉毒素B1进行快速定量测定。     

基于时间分辨荧光纳米微球的伏马毒素B1快速定量检测卡的制备及应用

为了满足粮食谷物中伏马毒素B1快速定量检测的需求,以伏马毒素B1为研究对象,建立了基于时间分辨荧光纳米微球的FB1荧光快速定量检测卡,检测前无需调整样品提取液p H,并借助酶联免疫试剂盒及高效液相色谱法分析比对了该荧光定量快速检测卡在粮食谷物（大米、玉米、小麦）中的检测性能。结果表明其检测不同样品的LOD在35.37～37.17μg/kg之间,LOQ在117.9～123.9μg/kg之间,灵敏度良好;线性范围均为250～6 000μg/kg,相关系数R2在0.997 2～0.999 5之间;不同样品中6个添加水平的加标回收率为83.38%～114.66%,变异系数（CV）小于15%,准确性和重复性良好;国标液相色谱法和伏马毒素B1荧光定量快速检测卡同时检测FB1污染的不同样品,检测结果的符合度为92.53%～106.26%,CV小于10.37%;与其他常见的5种真菌毒素的交叉反应率均小于5%,且添加浓度和检出浓度的差异极显著,表明特异性良好。因此,所制备的FB1荧光定量快速检测卡能够满足粮食谷物中伏马毒素B1现场化快速定量检测的需求。     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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