超高效液相色谱-串联质谱法同时检测牛乳中4 种驱虫药物残留

建立同时检测牛乳中4 种驱虫药物（吡喹酮、伊维菌素、阿维菌素、多拉菌素）残留的超高效液相色谱-串联质谱的方法。样品经乙腈提取,碱性氧化铝固相萃取小柱净化,采用UPLC ACQUITY BEH C18柱,以0.1%甲酸-乙腈（A）和0.1%甲酸-5.0 mmol/L乙酸铵（B）为流动相,梯度洗脱分离,在电喷雾正离子模式下以多反应监测方式检测。结果表明：4 种驱虫药物在5～100 ng/mL范围内线性良好,相关系数大于0.996,加标样品的平均回收率为76.4%～113.3%,相对标准偏差（n=6）为2.4%～10.6%。吡喹酮、伊维菌素、阿维菌素、多拉菌素的检出限分别为1.0、2.5、2.5、2.5 μg/kg。该方法简便、快速、准确,可以同时检测牛乳中吡喹酮、伊维菌素、阿维菌素、多拉菌素残留。     

超高效液相色谱-串联质谱法测定10种食品中的阿维菌素类药物残留

建立以超高效液相色谱-电喷雾串联质谱同时检测10种食品中的阿维菌素类药物(包括阿维菌素、伊维菌素、多拉菌素、依普菌素、莫西丁克和塞拉菌素6种大环内酯类药物)残留的确证方法。样品用乙腈提取,45℃旋蒸蒸干,再用乙腈-水(1:9,V/V)溶液复溶,PEP-C18混合固相萃取柱净化,氮气吹干后用乙腈定容,超高效液相色谱-串联质谱测定,电喷雾正离子(ESI+)、多反应模式下监测;结果表明,6种药物在5～250μg/kg范围内线性良好(R2＞0.99),3个添加水平下,6种药物的回收率在60%～99%之间,相对标准偏差为0.2%～8.9%。6种药物的定量限(RSN≥10)均达5.0μg/kg,符合痕量分析的要求。     

玫瑰鲜花饼中四种阿维菌素类药物残留水平分析及慢性膳食风险评估

为了解玫瑰鲜花饼中是否存在药物残留情况,以及是否存在慢性膳食摄入风险情况。本文通过检测玫瑰鲜花饼中四种阿维菌素类药物的残留情况,对其药物残留进行水平分析,评估其慢性膳食摄入风险。四种药物分别是阿维菌素、多拉菌素、乙酰氨基阿维菌素、伊维菌素。共收集了43种玫瑰鲜花饼样品,采用优化的QuEChERS方法对样品进行前处理,并用高效液相色谱-串联质谱仪来测定这4种化合物的残留水平,对它们进行慢性膳食摄入风险评估及风险排序。结果表明,四种阿维菌素类药物标线的判定系数均大于0.99,检出限的范围为0.1～0.7μg/kg,回收率范围为94.97%～102.09%,四种目标化合物只有阿维菌素被检出,检出率是79%,残留量范围为1.89～4.58μg/kg。对四种药物进行食品安全指数分析(IFS),阿维菌素为1.3×10^-3、多拉菌素为1.0×10^-4、乙酰氨基阿维菌素为1.7×10^-6、伊维菌素为1.2×10^-5;对四种目标化合物进行风险评估,并进行风险排序,四种药物总分均低于50,说明目前鲜花饼中阿维菌素类药物...     

超高效液相色谱-串联质谱法测定动物组织中苯并咪唑类药物的残留量

建立了动物组织中四种苯并咪唑类药物(氟苯哒唑、芬苯哒唑、阿苯哒唑和甲苯哒唑)多残留检测的高效液相色谱串联质谱法.用乙酸乙酯提取样品中的药物,提取液浓缩后加入乙腈和正己烷分配脱脂,采用中性氧化铝小柱净化.以乙腈-水作为流动相,液质联用仪(LC-MS/MS)检测,外标法定量.方法的回收率为60%～85%,平均变异系数＜15%,定量限为1 μg/kg.     

超高效液相色谱-串联质谱联用测定罗非鱼肌肉中甲基睾丸酮残留

建立罗非鱼肌肉中甲基睾丸酮残留量的超高效液相色谱-串联质谱联用(ultro high performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)测定方法。以氘代试剂为内标,样品经乙腈萃取后,乙酸乙酯液液分配,强阴离子交换柱净化,正己烷液液分离,硅酸镁固相萃取柱净化,采用UPLC-MS/MS选择离子监测(selected ion monitoring,SIR)正离子模式测定,可对罗非鱼肌肉中甲基睾丸酮残留进行定性和定量检测,检出限为0.4μg/kg,定量限为1μg/kg。线性范围为1～60μg/kg(r＞0.999),方法的平均回收率范围为71.06%～83.06%,相对标准偏差为7.4%～15.3%。完全满足食品安全及进出口罗非鱼肌肉中甲基睾丸酮残留的监控和检测需要。     

分子印迹固相萃取-超高效液相色谱-串联质谱法测定牛奶中11种氨基糖苷类抗生素

目的：建立分子印迹固相萃取-超高效液相色谱-串联质谱（UPLC-MS/MS,Ultra Performance Liquid Chromatography Tandem Mass Spectrometry）检测牛奶中11种氨基糖苷类抗生素（巴龙霉素、妥布霉素、庆大霉素、卡那霉素、阿米卡星、安普霉素、链霉素、双氢链霉素、新霉素、壮观霉素、潮霉素B）残留的测定方法。方法：样品经5%三氯乙酸-乙腈提取,氨基糖苷类分子印迹聚合物（MIP）固相萃取柱净化,SiELC Obelisc R色谱柱分离,采用超高效液相色谱-串联质谱仪进行测定。结果：方法检出限为1.0~5.0 μg/kg,定量限为2.0~10.0 μg/kg。11种氨基糖苷类药物在1.0~500 μg/kg范围内关系良好（r2>0.9911）,牛奶中加标回收率为70.7%~115.6%,相对标准偏差（RSD,relative standard deviation, n=6）为1.1%~9.8%。结论：本方法准确度、灵敏度高,可用于牛奶中11种氨基糖苷类抗生素的同时检测。     

UPLC-MS/MS法同时测定不同动物源性食品中硝基呋喃代谢物残留

采用超高效液相色谱串联质谱法(UPLC-MS/MS),建立了猪肉、猪肝、螃蟹和虾4种不同动物源性食品中同时测定4种硝基呋喃类药物代谢物的检测方法,优化了样品前处理的条件以及UPLC-MS/MS仪器条件,样品经盐酸水解,2-硝基苯甲醛衍生,乙酸乙酯提取,ESI正离子模式扫描,多反应监测(MRM)测定。结果表明:采用本方法在4种动物源性样品基质中4种代谢物浓度在1~100 ng/mL范围内线性关系良好;4种代谢物的平均回收率为84.6%~118.1%;相对标准偏差RSD为2.9%~8.1%;在4种样品基质中,3-氨基-2-唑烷基酮(AOZ)的检出限为0.1 μg/kg,定量限为0.4 μg/kg,氨基脲(SEM)和5-甲基吗啉-3-氨基-2-唑烷基酮(AMOZ)的检出限为0.2 μg/kg,定量限为0.5 μg/kg,1-氨基乙内酰脲(AHD)的检出限为0.5 μg/kg,定量限为1.0 μg/kg,均满足国家标准要求。采用本方法对市场上随机购买的80份动物源性样品和鸡肉中硝基呋喃代谢物质控样进行检测,结果与国家标准方法GB/T 20752-2006测定结果相近,质控样的检测结果在量值范围内。该方法前处理操作简便,较传统方法节省时间和成本,可为硝基呋喃类药物残留检测技术提供理论支撑和参考。     

分散固相萃取-超高效液相色谱-串联质谱法测定豆芽中6种喹诺酮类药物

本文建立了豆芽中恩诺沙星、环丙沙星、氧氟沙星、诺氟沙星、洛美沙星、培氟沙星6种喹诺酮类药物残留的分散固相萃取-超高效液相色谱-串联质谱的快速测定方法。豆芽样品中6种喹诺酮药物采用1%甲酸乙腈提取,提取液经N-丙基乙二胺(PSA)、十八烷基键合硅胶(C₁₈)、无水硫酸镁(MgSO₄)、石墨化碳(GCB)4种填料净化,净化液过滤膜后经ACQUITY UPLC BEH C₁₈色谱柱,甲醇-0.1%甲酸水流动相梯度分离,采用UPLC-MS/MS多反应监测模式进行测定,同位素内标法定量。结果显示:6种喹诺酮类药物在1.0~100.0 μg/L浓度范围内线性关系良好(r≥0.9982),检出限为0.1~0.3 μg/kg,定量限为0.3~1.0 μg/kg,在2、4、20 μg/kg三个浓度添加水平的回收率为96.53%~106.94%,相对标准偏差为2.73%~7.60%。该方法快速简便、灵敏度高、准确度高、重现性好,适用于豆芽样品中6种喹诺酮类药物的同时检测。     

QuEChERS前处理结合超高效液相色谱-串联质谱法同时检测茶叶中14种农药残留

建立了QuEChERS（Quick,Easy,Cheap,Effective,Rugged,Safe）前处理结合超高效液相色谱-串联质谱法（UPLC-MS/MS）测定茶叶中14种农药残留的方法。茶叶样品经含1%乙酸的乙腈提取,QuEChERS净化柱净化后直接进行UPLC-MS/MS测定。比较了4种QuEChERS净化柱对茶叶提取液的净化效果和农药残留的回收率,选取净化效果和回收率最好的净化柱进一步考察方法的基质效应、线性关系、回收率等。结果表明,方法的检出限为0.001~2.000 μg/L,定量限为0.003~5.000 μg/L;14种农药在相应浓度范围内呈良好的线性关系,决定系数R2为0.9926~0.9989。在100、500、800 μg/kg 3个添加水平下14种农药的回收率为71.2%~117.4%,相对标准偏差为1.1%~14.2%。该方法具有操作简单快速、灵敏度高、回收率好等优点,能够满足茶叶中多农残快速检测要求。     

HPLC-PAD外标法及UPLC-MS/MS内标法测定乳及乳制品中三聚氰胺的含量

分别建立高效液相色谱-二极管阵列法(HPLC-PAD)、超高压液相色谱-串联质谱法(UPLC-MS/MS)测定乳及乳制品中三聚氰胺含量的方法。利用HPLC-PAD外标法进行样品中三聚氰胺的初筛,利用UPLC-MS/MS法进行确证,以13C315N3-三聚氰胺为同位素内标定量。乳制品经乙腈、乙酸锌、盐酸溶液提取,质谱检测时,样品再经MCX固相萃取柱富集净化。HPLC-PAD法的定量限为4mg/kg,UPLC-MS/MS的定量限为0.05mg/kg;HPLC-PAD的添加回收率为95.7%～102.3%,UPLC-MS/MS的添加回收率为91.3%～95.7%(基质匹配曲线校正),两种方法的相对标准偏差(RSD)分别为1.98%～4.51%,1.60%～3.27%。     

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