超高效液相色谱-串联质谱法快速检测水产品中硝基呋喃类代谢物残留研究

以水产品中的硝基呋喃类代谢物残留为研究对象,建立超高效液相色谱-串联质谱(UPLC-MS/MS)测定水产品中硝基呋喃类代谢物残留分析方法。结果显示:硝基呋喃类代谢物在1. 0～100. 0 ng/mL的范围内线性关系良好,相对回收率为86. 2%～108%,相对标准偏差为3. 4%～9. 6%,检出限为0. 25μg/kg,定量限为0. 5μg/kg。与以往采用的超高效液相色谱-串联质谱方法相比,新建方法操作简单、快速、准确,是定量检测水产品中硝基呋喃类代谢物残留的有效技术手段。     

同位素稀释液相色谱-串联质谱法同时测定贝类产品中5种硝基呋喃代谢物

目的建立贝类产品中呋喃唑酮、呋喃它酮、呋喃西林、呋喃妥因和硝夫索尔代谢物的同位素稀释液相色谱-串联质谱(liquid chromatography-tandem mass spectrometry, LC-MS/MS)检测方法。方法样品中加入同位素内标,经盐酸水解及邻硝基苯甲醛衍生,调节pH为7.2±0.2,乙酸乙酯提取,氮吹浓缩,正己烷去脂净化,色谱柱分离,电喷雾电离(electronic spray ion, ESI)正负离子多反应(multiple reaction monitoring, MRM)模式检测,同位素内标稀释法定量。结果 5种硝基呋喃代谢物的方法定量限为0.1～0.2μg/kg;方法的线性范围为0.2～20μg/kg;相关系数均大于0.999;方法平均回收率为88.7%～112.1%,相对标准偏差为3.9%～13.7%。应用该方法对280份贝类产品进行检测,其中45份样品中检出了含量较低的氨基脲,范围值在0.21～1.86μg/kg。结论方法灵敏准确,适合贝类产品中硝基呋喃代谢物的检测。     

高效液相色谱–串联质谱测定动物源性食品中硝基咪唑类药物及其代谢物残留量

目的 建立高效液相色谱–电喷雾电离串联四级杆质谱测定动物源性食品中甲硝唑(MNZ)、地美硝唑(DMZ)、洛硝哒唑(RNZ)3种硝基咪唑类化合物及2种代谢物羟基甲硝唑MNZOH(甲硝唑代谢物)、1-甲基-5-硝基-2-羟甲基咪唑HMMNI(地美硝唑代谢物)残留量的检测方法。方法 样品采用乙酸乙酯提取, 甲醇和正己烷分配除脂, 再经HLB固相萃取柱净化, 采用高效液相色谱–串联质谱法在选择离子监测(MRM)正离子模式(ESI+)下检测。结果 该方法在0.1~100.0 μg/L范围内具有良好的线性关系, 相关系数r >0.99。在添加水平为0.1、0.5、10.0 μg/kg时, 方法的回收率在61.1 %~108.0 %之间, 相对标准偏差为1.9 %~6.3 % ; 定量下限(S/N=10)为0.1 μg/kg。结论 该方法适合动物源性食品中硝基咪唑类药物及其代谢物残留量的检测。     

水产品及其苗种中硝基呋喃代谢物的高效液相色谱- 串联质谱法测定

对115 个水产品及鱼苗样品进行呋喃妥因(AHD)、呋喃它酮(AMOZ)、呋喃唑酮(AOZ)和呋喃西林(SEM)4 种硝基呋喃代谢物残留量分析。样品水解、衍生和净化后,采用液相色谱- 电喷雾三重四级杆串联质谱仪检测,多反应监测扫描模式和同位素内标法定量。各类硝基呋喃代谢物线性范围为0.5～20ng/mL、检出限0.25μg/kg,在0.25～5μg/kg 范围内样品添加回收率为89.0%～117.2%,相对标准偏差小于10%。结果表明,水产鱼苗中的硝基呋喃代谢物残留量远远高于成鱼,其中大黄鱼苗中AOZ 的检出率为62%,最大残留量3890μg/kg,而大黄鱼成鱼AOZ 的检出率17%,最大残留量2.81μg/kg,同时淡水鱼的硝基呋喃类药物残留小于海产鱼。     

液相色谱-串联质谱法检测水产品中硝基呋喃类药物的残留量

目的建立液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry,LC-MS/MS)检测水产品中4种硝基呋喃类药物的残留量。方法样品中残留的硝基呋喃类药物经乙酸乙酯提取,无水硫酸钠脱水,减压浓缩后过HLB固相萃取柱净化,经Waters XTerra C_(18)色谱柱分离,采用乙腈和水作为流动相进行梯度洗脱,以电喷雾离子源正负离子切换和多反应选择监测模式进行质谱分析,以外标法定量。结果 4种硝基呋喃类药物在1~40 ng/m L范围内线性关系良好,相关系数均大于0.999。在添加水平为1、5和20μg/kg时,呋喃唑酮、呋喃它酮、呋喃西林和呋喃妥因的平均回收率在88.3%~102%之间,批内和批间变异系数均低于15%。4种硝基呋喃类药物的检出限均为0.50μg/kg。结论该方法快速、准确、灵敏,可满足水产品中硝基呋喃类药物残留量的检测。     

广东省鳜鱼和杂交鳢中孔雀石绿和硝基呋喃残留调查及暴露评估

目的了解广东省主要养殖地的鳜鱼和杂交鳢中孔雀石绿及其代谢物和硝基呋喃类代谢物的残留情况。方法利用高效液相色谱-串联质谱法对鱼肉中的孔雀石绿及其代谢物和硝基呋喃类代谢物残留量进行测定。结果2013年孔雀石绿的总检出率为11.7%,硝基呋喃类代谢物的总检出率为20%。2014年孔雀石绿的总检出率为25%,硝基呋喃类代谢物的总检出率为12.5%。近两年总孔雀石绿残留量在0.58~19.1μg/kg之间,总硝基呋喃类代谢物残留量在0.66~36.6μg/kg之间。暴露评估显示:人体每天可能的孔雀石绿的平均暴露量0.24μg,即每人每日膳食暴露量为0.004μg/kg BW,最高暴露量1.10μg,即每人每日膳食暴露量为0.02μg/kg BW;人体可能的每天呋喃西林代谢物的平均暴露量为0.34μg,即每人每日膳食暴露量为0.005μg/kg BW,最高暴露量为0.87μg,即每人每日膳食暴露量为0.01μg/kg BW;人体可能的每天呋喃唑酮代谢物的平均暴露量0.56μg,即每人每日膳食暴露量为0.009μg/kg BW,最高暴露量2.10μg,即每人每日膳食暴露量为0.03μg/kg BW。结论近两年鳜鱼和杂交鳢中孔雀石绿和硝基呋喃类检出率相对较低,膳食暴露评估显示孔雀石绿在此范围内对人体健康损害危险性极小。     

LC-MS/MS法检测鸡肉中硝基呋喃类代谢物的残留量

建立鸡肉中硝基呋喃类药物代谢物残留的液相色谱-串联质谱检测方法。样品经盐酸水解,邻硝基苯甲醛过夜衍生,调pH 7.2后,用乙酸乙酯提取,正己烷净化,以多离子反应检测模式(MRM)进行测定,采用同位素内标法进行定量。结果表明,该方法的线性范围为0.5～10μg/kg, 4种代谢物的线性相关系数均不小于0.999 4,检出限为0.5μg/kg。在0.5, 1.0和5.0μg/kg的添加水平下,加标回收率为85.6%～105.2%, RSD为4.17%～5.45%(n=6)。该法可作为鸡肉中4种硝基呋喃类药物的代谢物残留量同时分析的有效手段。     

高效液相色谱-串联质谱法测定鲜海参中的孔雀石绿及代谢物

目的建立测定鲜海参中孔雀石绿及代谢物的高效液相色谱-串联质谱法(high performance liquid chromatography-tandem mass spectrometry,HPLC-MS/MS)。方法本文对行业标准GB/T 19857-2005《水产品中孔雀石绿和结晶紫残留量的测定》的前处理方法进行了改进,针对海参样品粘稠、蛋白质含量高的特点,以氘代孔雀石绿、氘代无色孔雀石绿分别为孔雀石绿、无色孔雀石绿的同位素内标进行定量,高效液相色谱-串联质谱仪检测。结果孔雀石绿及无色孔雀石绿在0.5~10.0μg/kg质量浓度范围内线性关系良好(R20.999),在0.5、1.0、1.5μg/kg 3个质量浓度水平添加,平均回收率为85.0%~105.0%,相对标准偏差均小于1.4%。结论本研究建立的方法适合于鲜海参中孔雀石绿及代谢物的检测。     

UPLC-MS-MS法测定水产品中克百威及其代谢物

采用超高效液相色谱-串联质谱技术建立同时测定水产品中克百威及其代谢物(3-羟基克百威、3-酮基克百威和呋喃酚)含量的方法。样品经乙腈提取,正己烷脱脂,HLB固相萃取柱净化,色谱柱分离,电喷雾串联四极杆质谱进行检测,采用多反应监测分析,并对液质分离条件及参数和样品前处理条件进行优化。结果显示,克百威及其代谢物在0.08～100ng/mL范围内线性良好(0.998 3～0.999 7)。在0.25～2.5μg/kg时,平均加标回收率在87.9%～96.1%,RSD值在1.4%～9.5%。该方法测定克百威、3-羟基克百威、3-酮基克百威和呋喃酚的检出限均为0.25μg/kg。该方法快速、准确、灵敏,可用于水产品中克百威及其代谢物残留量的测定。     

荧光微球免疫层析方法定量检测水产品中4 种硝基呋喃代谢物

采用荧光微球标记抗体作为信号探针,建立荧光微球免疫层析检测方法（fluorescent microsphere immunochromatographic assays,FMICA）,并应用于水产品中4 种硝基呋喃类兽药代谢物残留量的快速定量检测。结果表明：呋喃妥因、呋喃它酮、呋喃唑酮、呋喃西林代谢物FMICA试纸条的检出限分别为0.004（以1-氨基-乙内酰脲衍生物计算）、0.01（以5-吗啉-3-氨基-2-恶唑烷酮衍生物计算）、0.008（以3-氨基-2-恶唑烷酮衍生物计算）、0.009（以氨基脲衍生物计算）μg/L;检测线性范围分别为0.005～5、0.01～10、0.01～10、0.01～10 μg/L;最佳检测时间为10 min,方法特异性良好。水产样品经衍生化处理后,经检测硝基呋喃代谢物的加标回收率在75.88%～104.81%之间,变异系数均小于15%。FMICA方法操作简单、快速、成本低,适用于水产品中硝基呋喃类兽药代谢物快速定量检测。     

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