胶体金免疫层析法快速检测食品中的米酵菌酸

制备特异性识别米酵菌酸的单克隆抗体,并以胶体金标记用作示踪物,建立胶体金免疫层析快速检测方法。研究胶体金标记体系pH值、抗原、抗体质量浓度、离子强度、表面活性剂以及样品前处理方法等对胶体金层析卡性能的影响。结果表明:在最适条件下,所建立的胶体金免疫层析方法对米酵菌酸的定量检出限为1.2 μg/kg,线性范围1.8~7.2 μg/kg,定性检出限16.0 μg/kg。该方法特异性良好,与食品中常见的毒素无交叉反应,对银耳、木耳和米粉等样品的添加回收率在80.2%~101.2%之间,相对标准偏差小于6.4%,且结果与LC-MS/MS法一致。该方法具有准确、灵敏、简便、快速和低成本等特点,可以满足食品中米酵菌酸现场大批量筛查的需求。     

超高效液相色谱串联质谱法测定银耳中米酵菌酸

建立了快速测定银耳中米酵菌酸的超高效液相色谱串联质谱分析方法。样品采用甲醇提取,混合强阴离子交换固相萃取柱(PAX)净化,UPLC BEH C18(2.1×100 mm,1.7μm)色谱柱分析,以10 mmol/L乙酸铵-乙腈为流动相,梯度洗脱,串联四级杆质谱多反应监测负离子模式检测,基质匹配外标法定量。结果表明,米酵菌酸在1.6μg/L~80μg/L线性范围内,相关系数(r)0.999 9,检出限0.5μg/kg,加标回收率82%~102%,相对标准偏差RSD≤8.5%。本方法快捷准确、灵敏度高,可用于银耳中米酵菌酸的确证方法。     

高效液相色谱-串联质谱法快速检测银耳中的米酵菌酸

目的建立高效液相色谱-串联质谱法(highperformanceliquidchromatography-tandemmass spectrometry,HPLC-MS/MS)快速检测银耳中的米酵菌酸的方法。方法样品以甲醇提取后,超声振荡,离心分层,上清液用甲醇定容。使用空白基质液配置标准曲线对结果进行校正。在优化后的色谱及质谱条件下,采用(electronsprayionization,ESI)负离子模式进行电离,并通过多反应监测(multi-selectedreactionmonitoring,MRM)模式对目标化合物的定量离子和定性离子进行测定。结果米酵菌酸在0.50～50.00μg/L范围内线性良好,相关系数r为0.9996,3个浓度添加水平的平均回收率范围在80.6%～95.6%之间,相对标准偏差为4.98%～7.21%。方法检出限(limit of detection, LOD)为5.0μg/kg,定量限(limit of quantification, LOQ)为15.0μg/kg。结论该方法操作简便快速,回收率高、灵敏度高、精密度好,适合测定银耳基质中的米酵菌酸。     

QuEChERS-UHPLC-MS/MS法测定黑木耳中米酵菌酸残留量

目的：建立一种快速测定黑木耳中米酵菌酸残留量检测的QuEChERS-UHPLC-MS/MS方法。方法：利用加标样品对提取溶剂、提取时间、吸附剂种类及吸附剂用量等参数进行优化，样品用1%氨水—甲醇提取，经C18吸附剂净化，采用电喷雾电离源负离子多反应监测模式分析，外标法定量。结果：样品在4 min内完成分析，米酵菌酸在质量浓度0.50~10.00 ng/mL内线性关系良好，相关系数(r)为 0.998 3，检出限(LOD)为2 μg/kg。在空白样品中添加低、中、高3个浓度水平的日内平均回收率为74.4%~91.6%(n=6)，日间平均回收率为74.9%~89.4%(n=3)，相对标准偏差(RSD)为3.3%~9.2%。结论：该方法操作简单、快速、回收率优良，重复性好、检测限低于现有检测标准要求，可用于黑木耳中米酵菌酸含量的定性和定量分析。     

超声辅助液液萃取-超高效液相色谱-串联质谱法测定米粉、河粉中的米酵菌酸

目的 建立超声辅助－液液萃取－超高效液相色谱－串联质谱法快速测定米粉、河粉中毒样品中米酵菌酸的方法。方法 在称取适量已匀浆好的样品中,加入乙腈超声提取、离心后取上清液,过0.22 μm的微孔滤膜, 待测物经0.2%甲酸-乙腈流动相, 经Thermo Hypersil GOLD C18柱（2.1 mm×100 mm ×1.9 μm）分离,以0.2%甲酸-乙腈为流动相,用超高效液相色谱－串联质谱仪 ESI源、采用ESI离子源负离子多反应监测模式检测,外标法定量。结果 在优化的条件下,该方法该方法的线性范围为0.5~100 μg/L,相关系数r为大于0.99550.999,线性关系良好,血浆中米酵菌酸的检出限(LOD, S/N=3)为0.05 μg/L,定量限(LOQ, S/N=10)0.15 μg/L,河粉中米酵菌酸的检出限米粉和河粉中米酵菌酸的检出限均为(LOD, S/N=3)为0.01μg/kg,定量限(LOQ, S/N=10)均为0.03 μg/kg,样品加标回收率在71.081.0%~81.890.4%之间,相对标准偏差（RSD）≤8.65.5%。 结论 该方法一步提取净化,不需要更换溶剂和固相萃取,方法快速、灵敏、准确,可应用于米粉、河粉中的米酵菌酸的测定突发应急事件中包括生物样品和食品在内的中毒样品的检测,为临床诊断和救治提供可靠的依据。     

高效液相色谱-二极管阵列检测器结合固相萃取法快速测定食品中米酵菌酸残留

建立WAX混合型弱阴离子固相萃取富集净化,高效液相色谱-二极管阵列检测器快速测定食品中米酵菌酸残留的方法。采用C18色谱柱（4.6 mm×250 mm,5 μm）,以乙腈-甲醇-1%乙酸溶液（10∶62∶28,V/V）为流动相,以269 nm为分析波长,米酵菌酸在0.1～40 mg/L质量浓度范围内线性良好,相关系数r值大于0.999。本实验考察样品的提取条件及不同固相萃取小柱净化效果,结果表明,选择体积分数80%乙腈溶液为提取溶剂,超声提取30 min,WAX小柱富集、净化,效果最佳。方法检出限为0.03 mg/kg。通过不同样品加标验证,平均回收率为83.3%～95.6%,相对标准偏差不大于5%（n=6）。与GB/T 5009.189-2003《银耳中米酵菌酸的测定》方法相比,该方法精确灵敏、回收率高、前处理简单快速,适用于各种食品中米酵菌酸残留快速测定。     

皮革及其制品中含氯酚的快速筛查和确证

建立了1个超高效液相色谱/静电场轨道阱高分辨质谱(UPLC/Orbitrap HRMS)方法,对皮革及其制品中含氯酚进行了快速筛查和确证。该方法采用水汽蒸馏法提取皮革及其制品中的含氯酚,提取物经液液萃取、浓缩后,用乙腈定容,进行UPLC/Orbitrap HRMS分析,提取离子色谱峰面积外标法定量。19种含氯酚的色谱分离在Hypersil GOLD色谱柱(100 mm×2.1 mm,1.9μm)上完成,流动相为乙腈/氨水溶液(p H=10.5),洗脱方式为梯度洗脱。质谱分析采用电喷雾负离子模式,一级质谱扫描范围为m/z 50~m/z 300。采用保留时间和准分子离子精确质量数进行定性,利用二级质谱进行确证,19种含氯酚的质量精确度偏差均小于2×10~(-6)(2 ppm)。在3个不同添加浓度水平下,方法的平均加标回收率为82.08%~94.23%,相对标准偏差(RSD)为3.15%~9.99%。该方法定性可靠,定量准确,定量限低至2.0~10.0μg/kg,可完全满足皮革及其制品中含氯酚快速筛查和确证的需要。     

云南省一例唐菖蒲伯克霍尔德氏菌(椰毒假单胞菌酵米面亚种)食物中毒事件调查分析

目的 调查分析云南省一例唐菖蒲伯克霍尔德氏菌(椰毒假单胞菌酵米面亚种)食物中毒事件。 方法 参照GB/T 4789.29-2003《食品卫生微生物学检验 椰毒假单胞菌酵米面亚种检验》对样品进行唐菖蒲伯克霍尔德氏菌检测。按照GB 5009.189-2016《食品安全国家标准 食品中米酵菌酸的测定》检测样品中的米酵菌酸, 采用液相色谱法对样品进行检测。用VITEK 2COMPACT 全自动微生物生化鉴定仪和飞行时间质谱进行微生物鉴定。结果 2份样品鉴定结果为唐菖蒲伯克霍尔德菌。2份样品均检测出米酵菌酸, 含量分别为18.0和24.2 mg/kg。 结论 本次食物中毒源于食源性唐菖蒲伯克霍尔德氏菌(椰毒假单胞菌酵米面亚种)污染。     

SPE-HPLC法快速测定食品中的米酵菌酸及其膳食风险评估

建立了固相萃取-高效液相色谱测定食品中米酵菌酸残留的方法,并评估了米酵菌酸的膳食风险水平。以米粉、银耳、玉米粉、椰子发酵饮料为研究对象,样品经过1%乙酸-乙腈（V/V）提取后,采用Poly-Sery MAX强阴离子交换柱进行净化,Athena C₁₈-WP（4.6×250 mm, 5 μm）分离,以甲醇:1%乙酸-水（80:20,V/V）为流动相,269 nm为定量波长,二级管阵列检测器分析。结果表明,在优化色谱条件下,米酵菌酸在0.01~2.0 μg/mL的质量浓度范围内线性良好,相关系数为0.9999;在4种基质中进行低、中、高3个水平加标,加标回收率在90.0%~104.0%,相对标准偏差<5%（n=6）,检出限和定量限分别为2.0、6.7 μg/kg,该方法前处理简便快速,精确灵敏,回收率高,适用于各类食品中米酵菌酸含量的准确定量分析;膳食风险评估结果表明,米酵菌酸的膳食危害商值为0.0747,远低于临界值1,对消费者的膳食安全构成威胁的概率较低。     

漂浮有机凝固液相微萃取-高效液相色谱法测定食品中米酵菌酸

建立漂浮有机液滴凝固液相微萃取法联合高效液相色谱测定食品中米酵菌酸。方法经过系统的优化后,确定了最佳萃取条件：以30 μL十二醇作为萃取溶剂、300 μL丙酮作为分散剂,供相溶液pH值为2,在室温下萃取时间为15 min。在最佳萃取条件下,米酵菌酸在0.5～10 ng/mL的浓度范围内线性良好,相关系数R²大于0.999,最低检测限为1.00 μg/kg,样品加标回收率为83.5%～98.6%,富集倍数约达200倍。该方法快速准确、绿色环保,适用于食品中米酵菌酸的检测。     

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