食品中黄曲霉毒素B_1的液相色谱-串联质谱测定法

建立了食品中黄曲霉毒素B1残留量的超高效液相色谱-串联质谱的检测方法。样品经乙腈+水(84+16)提取后,经多功能净化柱净化,超高效液相色谱-串联质谱法检测。本方法定量限为1μg/kg,线性范围为1~20 ng/mL;在黄曲霉毒素B1添加水平为1~10μg/kg时,在玉米样品中的回收率为95%~105%;在酱油样品中的回收率为96%~106%。     

固相萃取-高效液相色谱-串联质谱联用法检测辣椒及其制品和肉酱中的罗丹明B含量

建立了辣椒及其制品和肉酱中罗丹明B含量的固相萃取-高效液相色谱-串联质谱联用(SPELC-MS/MS)检测方法。样品经乙腈提取后,经中性氧化铝固相萃取柱净化,超高效液相色谱-串联质谱法检测。本方法定量限为0.1μg/kg,线性范围为0.2~50ng/mL;在罗丹明B添加水平为0.1~10μg/kg时,辣椒片样品中的回收率为76%~92%,辣椒制品中的回收率为74%~93%,肉酱样品中的回收率为70%~90%。     

UPLC-MS/MS法同时测定蔬菜中34种农药残留

采用超高液相色谱-串联质谱联用仪(UPLC-MS/MS)技术建立了同时检测蔬菜中34种农药多残留量的快速检测方法。样品经乙腈提取,浓缩定容后用Qu ECh ERS农残净化管净化,Acquity BEH-C18超高液相色谱柱分离,进入电喷雾串联四极杆质谱进行检测,采用多反应监测(MRM)分析,对液质分离条件进行优化。结果表明34种农药在10 ng/m L~200 ng/m L范围内线性良好(r≥0.993 6)。在10μg/kg~30μg/kg范围内,平均加标回收率在68.7%~116.8%之间,RSD≤12%。该方法检出限为0.001 mg/kg~0.01 mg/kg,测定结果满足蔬菜样品中多残留农药的检测要求。     

UPLC-MS-MS法检测辣椒及其制品和肉酱中的罗丹明B含量

建立了辣椒及其制品和肉酱中罗丹明B含量的超高效液相色谱-串联质谱联用检测方法。样品经乙腈提取后,经中性氧化铝固相萃取柱净化,超高效液相色谱-串联质谱法检测。本方法定量限0.1μg/kg,线性范围0.2~50 ng/mL;在罗丹明B添加水平0.1~10μg/kg时,辣椒片样品中的回收率76%~92%,辣椒制品中的回收率74%~93%,肉酱样品中的回收率70%~90%。     

气相色谱-质谱法测定食品中杀螨剂残留量

建立了一种适用于粮谷、蔬菜、水果、茶叶、水产品、肉类、蜂产品、坚果、调味品和动物肝脏等食品中杀螨剂残留量的检测和确证方法,样品以乙酸乙酯或乙腈为提取溶剂,匀浆提取,用凝胶净化系统(GPC)净化,对一些特殊样品采用固相萃取净化,用气相色谱-质谱检测.浓度在0.01～0.50μg/mL范围内,检测限0.01～0.02mg/kg;回收率71.4%～105.1%.     

溶剂吸收-气质联用法测定蔬菜和粮谷中代森铵残留

目的建立一种测定蔬菜和粮谷中代森铵残留量的溶剂吸收-气相色谱-质谱(gas chromatographymass spectrometry,GC-MS)联用测定法。方法样品在氯化亚锡盐酸溶液中加热反应,生成二硫化碳气体经正己烷吸收,用气质联用仪测定。结果添加代森铵浓度水平为0.03、0.3、0.6mg/kg,平均回收率在75.7%~91.0%,相对标准偏差在4.2%~9.1%,定量限为0.03mg/kg。结论建立的方法灵敏度高,特异性好,为农产品中二硫代氨基甲酸酯类农药残留量监测提供又一可靠的测定方法选择。     

液相色谱-质谱联用测定食品中的微量甜蜜素

建立测定食品中微量甜蜜素的液相色谱-质谱测定方法.样品中的甜蜜素用水提取,经C18柱分离后,用ESI负离子模式检测.方法的线性范围为1.0～100.0 ng/mL,检出限为0.01μg/g,加标回收率为92.0%～102.0%.     

超高效液相色谱质谱联用仪测定水产品中敌百虫的含量

建立敌百虫在水产品中残留量的超高效液相色谱-电喷雾质谱(UPLC-MS/MS)测定方法。用乙酸乙酯提取样品中的敌百虫,提取液经酸性氧化铝柱净化,经超高效液相色谱分离,用串联质谱测定,正离子多反应监测(MRM)模式检测,外标法定量。在0.02～0.8ng/mL范围内,敌百虫标准工作溶液的色谱峰面积与质量浓度成良好的线性关系,相关系数r=0.9992;水产品中敌百虫的添加回收率在89.0%～93.8%,相对标准偏差为2.1%～5.4%,检出限为1.0μg/kg。方法简便、快速、准确,保留时间为1.5min。     

超高效液相色谱串联质谱法测定上海青基质中吡虫啉和嘧霉胺残留

本文研究建立了超高效液相色谱-四级杆串联质谱(UPLC-MS/MS)同时检测上海青基质中吡虫啉和嘧霉胺残留量的方法。上海青样品经乙腈提取,SPE氨基固相萃取柱净化(乙腈+甲苯(3+1)洗脱)后,以乙腈-0.1%甲酸溶液为流动相进行超高效液相色谱梯度洗脱分离,质谱多反应监测模式检测,以保留时间和子离子比定性,外标法定量。结果表明,吡虫啉和嘧霉胺的方法定量限(LOQ)分别为3.1×10-6 mg/kg和3.6×10-7 mg/kg,在0.0005~0.5 mg/L线性范围内,两种农药的相关系数为0.9995以上。添加水平在0.02~0.2mg/kg范围内,吡虫啉和嘧霉胺平均回收率分别为99.1%~105.8%和99.1%~110.0%之间,相对标准偏差(RSD)分别小于1.23%和1.64%。该方法操作简单、线性范围宽、灵敏度高、稳定可靠,可满足当前国内外蔬菜中此类药物残留量的检测要求。     

农产品中百速隆残留量的液相色谱-质谱法测定

建立了农产品中除草剂百速隆残留量的液相色谱-质谱(GC/MS)检测方法;样品经溶剂提取、固相萃取柱净化,采用液质联用仪在选择离子监测模式下进行快速定性定量分析,外标法定量,方法检出限为0.01 mg/kg。在大米、苹果、洋葱、猪肝中4种样品中添加不同浓度的百速隆时,其平均添加回收率在78.9%~95.9%之间,相对标准偏差(n=10)为2.1%~8.4%。     

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