分子印迹柱净化-UPLC-MS/MS测定果蔬制品中展青霉素

建立分子印迹亲和柱净化-超高效液相色谱串联质谱检测果蔬制品中展青霉素的方法。样品经2.5%乙酸水提取,分子印迹亲和柱净化,超高效液相色谱串联质谱测定,外标法定量。展青霉素在2.0 ng/mL~50.0 ng/mL范围内线性良好(R2≥0.999 8),方法的检出限为2.0μg/L。在添加水平为5.0和50.0μg/L时,4种果蔬制品回收率为78.4%~92.0%,相对标准偏差低于7.2%。该方法准确、稳定、灵敏,能够满足果蔬制品中展青霉素检测与确证的需要。     

液相色谱-串联质谱法测定禽蛋中β-内酰胺类药物残留

目的 建立了禽蛋中普鲁卡因青霉素、青霉素V、青霉素G、氨苄西林、氯唑西林、阿莫西林、头孢氨苄、头孢噻呋、头孢喹肟药物残留检测的液相色谱-串联质谱方法。方法 禽蛋用80%乙腈水溶液提取,PRiME HLB固相萃取小柱净化,用液相色谱-串联质谱测定,青霉素G-D7内标法定量。结果 在0.5-20μg/L的基质匹配标准溶液内9种β－内酰胺类药物均呈良好线性关系,相关系数均大于0.994。样品中9种β－内酰类药物的定量限为1μg/kg,在1μg/kg～10μg/kg的添加浓度范围内平均回收率为73%～96%,相对标准偏差(RSD)小于10%。本方法方便快捷准确,适于禽蛋中的9种β－内酰胺类药物残留检测。     

高效液相色谱-串联质谱法测定牛奶和奶粉中9种青霉素类药物残留量

建立一种检测牛奶和奶粉中9种青霉素类药物残留量的高效液相色谱-串联质谱方法。样品经乙腈-水提取,经HLB固相萃取柱净化,用高效液相色谱串联质谱检测,外标法定量。本方法的检出限,牛奶中氨苄西林、奈夫西林为1μg/kg,阿莫西林、哌拉西林、青霉素G、青霉素V、氯唑西林为2μg/kg,苯唑西林、双氯西林为4μg/kg;奶粉中氨苄西林、奈夫西林为8μg/kg,阿莫西林、哌拉西林、青霉素G、青霉素V、氯唑西林为16μg/kg,苯唑西林、双氯西林为32μg/kg。9种青霉素在1.0～50ng/mL范围呈良好线性,线性相关系数大于0.9888。牛奶的平均回收率为77.58%～97.77%,测定结果的相对标准偏差为4.24%～16.59%(n=10);奶粉的平均回收率在85.95%～96.78%之间,相对标准偏差为2.71%～13.41%(n=10)。该方法具有简便、快速、准确度高、检出限低的优点,适用于牛奶和奶粉中青霉素类抗生素的测定。     

液相色谱-串联质谱法测定河豚鱼和鳗鱼中9种青霉素类抗生素

目的建立高压液相色谱-电喷雾串联质谱(HPLC-MS-MS)同时测定河豚鱼和鳗鱼中9种青霉素残留量的检测方法。方法样品经乙腈-氨水溶液提取后,用C18色谱柱分离,乙腈-乙酸为流动相梯度洗脱,最后采用液相色谱-电喷雾串联质谱在正离子多反应监测模式下测定。结果在1.0～20μg/kg(LOQ～10LOQ)范围时,方法线性关系良好,相关系数大于0.999。在LOQ、2LOQ、4LOQ、10LOQ四个添加水平下青霉素的回收率在81.4%～109.7%之间,相对标准偏差在2.81%～7.12%之间,方法检出限是:萘夫西林、青霉素G、哌拉西林、青霉素V、苯唑西林为1.0μg/kg;阿莫西林、氨苄西林、氯唑西林、双氯西林为2.0μg/kg。结论此方法灵敏度高,准确性好,适用于水产品中青霉素的定量检测。     

分子印迹固相萃取-高效液相色谱法测定果汁中的展青霉素

建立了分子印迹固相萃取-高效液相色谱法测定果汁中展青霉素的方法。浓缩果汁样品经酶解,乙酸-水溶液稀释,分子印迹固相萃取小柱净化后(澄清果汁样品经乙酸-水溶液稀释后,直接进行SPE净化),以Waters XSELECT HSS T3色谱柱为分离柱,以水和乙腈作为流动相,二极管阵列检测器高效液相色谱进行检测,外标法定量。展青霉素在20～1000μg/L质量浓度范围内线性关系良好,相关系数为0.9994,方法的定量限为10.0μg/kg;添加水平为10.0、20.0μg/kg和40.0μg/kg时,加标回收率为83.0%～91.5%,相对标准偏差为2.8%～7.6%。结果表明:该方法准确、高效、特异性好、重现性高,适用于果汁中展青霉素的测定。     

高效液相色谱串联质谱法测定蔬果中啶酰菌胺和环酰菌胺残留

建立蔬菜和水果中啶酰菌胺和环酰菌胺的高效液相色谱串联质谱检测方法。将试样中残留的啶酰菌胺和环酰菌胺用含1%乙酸的乙腈溶液均质提取,提取液混合使用乙二胺-N-丙基硅烷和十八烷基硅烷键合相基质分散净化,用高效液相色谱串联质谱检测和确证,外标法定量;方法通过空白基质溶液稀释标准建立校正的标准曲线,以消除基质效应。结果表明：啶酰菌胺和环酰菌胺在1～100μg/L范围内具有良好的线性关系,相关系数分别为0.9996和0.9997;在5～50μg/kg范围内,平均添加回收率在77.7%～93.8%之间,相对标准偏差在2.1%～6.3%之间。啶酰菌胺和环酰菌胺方法定量限分别为1.32μg/kg和1.20μg/kg,检出限分别为0.395μg/kg和0.361μg/kg。     

超高效液相色谱-质谱法测定果酱中纳他霉素残留

目的建立了果酱中纳他霉素的超高效液相色谱-串联质谱(UPLC-MS/MS)检测方法。方法样品加入0.5g氯化钠、经10ml丙酮萃取,以甲醇-水溶液为流动相进行梯度洗脱,经BEHC18色谱柱分离,通过多反应监测模式(MRM)进行测定。结果纳他霉素在蓝莓果酱、葡萄树莓果酱、香蕉草莓果酱、黄桃果酱、苹果果酱和山楂草莓果酱中的线性范围分别为0.5～25.0、0.5～25.0、1.0～25.0、1.0～25.0、0.5～25.0和1.0～25.0μg/kg,相关系数(R2)均大于0.99。6种果酱中目标化合物的定量限为0.5～1.0μg/kg,3个浓度水平的加标回收率为80.1%～113.3%,相对标准偏差(RSD,n=5)小于20%。结论该方法快速、准确、操作简便,可用于果酱中纳他霉素的确证和定量分析。     

液相色谱法及液相色谱-串联质谱法测定山楂及其制品中展青霉素的结果比较与建议

目的比较液相色谱法(liquidchromatography,LC)和液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry, LC-MS/MS)测定山楂及其制品中展青霉素的方法学指标。方法 LC法:山楂及固体制品经粉碎酶解后,用乙酸乙酯提取,Mycosep?228Aflapat净化柱净化浓缩,以乙腈和水作为流动相进行梯度洗脱,液相色谱仪被测定; LC-MS/MS法:样品处理方法同LC法(除加同位素外),以乙腈和水作为流动相进行梯度洗脱,外标法定量,采用电喷雾离子源负模式测定。结果 LC法和LC-MS/MS法展青霉素在10～200 ng/mL浓度内线性良好,相关系数均大于0.9999; LC法的回收率为96.12%～104.20%, RSD均小于2.5%,检出限为0.52～0.63μg/kg,定量限为1.7～2.0μg/kg; LC-MS/MS法的回收率为94.68%～103.59%, RSD均小于2.5%,检出限为0.12～0.39μg/kg,定量限为0.38～1.29μg/kg。结论 2种方法结果无显著差异,均可适用于山楂及山楂制品中展青霉素的测定。     

液相色谱-串联质谱联用法测定酱油中T-2毒素残留

目的:研究以液相色谱-串联质谱联用法测定酱油中T-2毒素含量的方法。方法:液相色谱-串联质谱法。用乙腈-0.1%甲酸溶液提取酱油,经C18净化,电喷雾正离子多反应监测(MRM)模式检测。结果:T-2毒素在1～25μg/L的系列浓度范围呈线性相关,酱油中T-2毒素的检测限为2.0μg/kg,定量限为5.0μg/kg,在2～20μg/kg的添加浓度范围内平均回收率为85.5%～98.2%。结论:该方法灵敏度高,重现性好,可作为酱油中T-2毒素残留量检测方法。     

超高效液相色谱串联质谱法测定鸡肝脏中的马杜霉素

本文采用超高效液相色谱-串联质谱法测定鸡肝脏中的马杜霉素残留。样品以乙腈提取,经HLB固相萃取柱净化,超高效液相色谱-串联质谱检测。方法定量限2μg/kg,线性范围2～100μg/m L;在马杜霉素添加水平为2～10μg/kg时,鸡肝脏中马杜霉素回收水平在78.5%～108.6%,方法稳定可靠,适合相应鸡肝脏产品的马杜霉素检测。     

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