纺织品中邻苯基苯酚残留量测定方法的研究

提供了两种样品前处理方法,采用气相色谱-质谱法(GC-MSD)测定及确证纺织品中邻苯基苯酚的残留量。方法1,即试样经甲醇超声波提取,提取液经浓缩定容后,用配有质量选择检测器的气相色谱仪(GC/MSD)测定,外标法定量,采用选择离子检测进行确证;方法2,即试样用甲醇超声波提取,提取液经浓缩后,在碳酸钾溶液介质下经乙酸酐乙酰化后,以正己烷提取,采用选择离子检测进行确证,可适用于对各种纺织材料中邻苯基苯酚及其盐和酯类物质残留量的测定。当添加浓度为0.50、5.00μg/g水平时,方法1的平均回收率为85.8%~94.2%,相对标准偏差为4.36%~7.51%,测定低限为0.1μg/g;方法2的平均回收率为85.4%~93.5%,相对标准偏差为4.20%~8.82%,测定低限为0.05μg/g,各项指标均满足有关要求。     

鞋类部件中对苯二胺的高效液相色谱-串联质谱法测定

建立了鞋类部件用皮革及纺织品中对苯二胺残留量的高效液相色谱-串联质谱(HPLC-MS/MS)测定方法。该方法以甲醇为提取溶剂进行超声提取,提取液经净化后进行HPLC-MS/MS测定,外标法定量。以鞋类皮革和纺织品部件为代表性样品,对提取方式、提取溶剂、提取温度、提取时间等前处理条件进行选择优化。试验结果表明:对苯二胺在5~500μg/L浓度内线性相关系数0.999 1,线性关系良好;在本方法的试验条件下,检出限为0.04 mg/kg,回收率在80%~100%内,相对标准偏差在3%~8%。该方法可用于鞋类部件中对苯二胺残留量的测定。     

快速溶剂萃取法提取测定出口纺织品中邻苯基苯酚

为打破欧盟的技术壁垒,应用快速溶剂萃取法提取测定出口纺织品中的邻苯基苯酚。以甲醇为溶剂,在温度为50℃,压力为10.34 MPa的条件下进行提取,选用HP-5毛细管色谱柱,采用GC-FID测定出口纺织品中邻苯基苯酚的含量。此方法的检出限为0.05μg/g,线性方程为Y=19.891X-0.599 8,线性相关系数r2=0.999 8,线性范围为0.1~15.0μg/mL,平均回收率为100.8%。结果表明该方法具有操作简便,快速方便,灵敏度高等特点,可满足出口纺织品中邻苯基苯酚检测的要求。     

高效液相色谱法测定竹筷中噻苯咪唑、邻苯基苯酚和联苯

建立高效液相色谱测定竹筷中噻苯咪唑、邻苯基苯酚、联苯的方法。以甲醇为提取溶剂,用索氏提取法提取竹筷中噻苯咪唑、邻苯基苯酚和联苯3种保鲜剂。以甲醇-水(体积比70:30)为流动相,流速1.0mL/min,采用C18柱(250mm×4.6mm,5μm)分离,紫外检测器检测,检测波长247nm,进样量20μL。方法的相关系数均大于0.999,最低检出限为0.01μg/mL,平均回收率为95.8%～97.1%,相对标准偏差为1.4%～2.6%。应用所建立的方法测定一次性竹筷中噻苯咪唑、邻苯基苯酚、联苯的残留量,结果表明：该方法样品处理简单,色谱分离完全,结果准确可靠,适于竹筷中噻苯咪唑、邻苯基苯酚和联苯的分析检测。     

HPLC-ESI/MS测定纺织品中痕量五氯酚

采用高效液相色谱-电喷雾电离质谱联用法(HPLC-ESI/MS),测定纺织品中五氯酚残留量.以酸化正己烷提取纺织品试样中的残留五氯酚,在Eclipse XDB-C18柱(150 mm×2.1 mm I.D.,5μm)上,采用5 mmol/L醋酸铵溶液/甲醇(体积比30:70)为流动相进行分离,结合电喷雾电离离子化技术,在选择离子监测(SIM)模式下进行测定,外标法定量.五氯酚检测的线性范围为5.0～500.0 μg/L,定量检出限为0.005 mg/kg,方法回收率为82.0%～94.4%,其RSD均小于12.5%.该法灵敏度高、操作简便、快速,适用于大批量样品的测定.     

气相色谱/串联质谱法同时测定纸和纸制品中19种含氯酚残留量

建立了1个气相色谱/串联质谱方法,对纸和纸制品中19种含氯酚的残留量进行了同时测定,并对分析条件和提取条件进行了优化。结果表明,该方法简便快捷、灵敏度高,各组分的定量限均为2μg/k g。在3个不同加标水平下,平均加标回收率为81.35%~93.48%,相对标准偏差为2.87%~8.65%(n=9)。采用该方法对市售纸和纸制品进行测定,结果表明市售纸和纸制品中含氯酚残留量很低。     

豆芽中6种植物生长调节剂残留的质谱检测

建立Qu ECh ERS-超高效液相色谱-串联质谱(UPLC-MS/MS)法同时测定豆芽中赤霉素、多效唑、2,4-二氯苯氧乙酸、4-氯苯氧乙酸、氯吡脲和噻苯隆6种植物生长调节剂残留量的分析方法。豆芽样品经过1%乙酸的乙腈溶液提取,分散固相萃取净化,经Agilent Eclipse Plus C18色谱柱(3.0 mm×50 mm,1.8μm)分离,在动态多反应监测(DMRM)模式下测定,外标法定量。结果表明,6种植物生长调节剂在1~100μg/L浓度范围内均有良好的线性关系,相关系数r在0.999 6~0.999 9之间,方法的检出限为0.75~1.50μg/kg,定量限为0.15~7.50μg/kg,豆芽3个水平的添加回收率为75.5%~110.5%,相对标准偏差为1.5%~9.9%。该方法简单、快速,具有良好的灵敏度、准确度和回收率,满足豆芽中6种植物生长调节剂残留量的检测要求。     

超声萃取+GC/MS测定纺织品中的酚类抗菌剂

采用超声萃取和气质联用(GC/MS)分析技术,建立了抗菌纺织品中4-氯-3,5-二甲基苯酚(PCMX)和4-氯-3-甲基苯酚(PCMC)的测定方法。样品经甲醇超声萃取、浓缩后,用萃取剂定容,DB-5MS柱分离,选择离子(SIM)模式下定量检测。在优化的试验条件下,2种含氯酚的线性范围为0.1～100.0μg/mL,相关系数均大于0.999 1。定量下限分别为0.1 mg/kg和0.5 mg/kg,加标回收率为88.5%～92.6%,相对标准偏差均小于4.7%。该方法灵敏度高,操作简单,可用于抗菌纺织品中酚类化合物含量的快速检测。     

GPC净化-GC-MS/MS法测定鳗鱼中杀虫脒、双甲脒及代谢物残留

建立了鳗鱼中杀虫脒及其代谢物4-氯邻甲基苯胺、双甲脒及其代谢物2,4-二甲基苯胺残留的GPC-GC/MS/MS检测方法。样品经环己烷+乙酸乙酯(1+1)均质提取,凝胶渗透色谱净化,采用气相色谱-串联质谱检测,外标法定量。结果表明:4种农药在5~100μg/L质量浓度范围内,组分含量与峰面积呈线性相关,相关系数为0.998 8~0.999 8,4种农药在鳗鱼中不同质量浓度水平的加标回收率分别为74.55%~99.28%,71.09%~96.70%和77.47%~89.42%,相应的相对标准偏差分别为2.52%~4.49%,2.78%~5.27%和0.73%~3.27%(n=6)。方法检出限为0.07~2.0μg/kg。该方法具有检出限低、灵敏度高、快速、准确的特点,可适用于鳗鱼中杀虫脒、双甲脒及代谢物农药残留同时检测。     

标准曲线法测定纺织品中邻苯基苯酚含量的研究

本文针对GB/T 20386—2006《纺织品邻苯基苯酚的测定》中两种提取方法的不足,提出用20μg/mL、50μg/mL,100μg/mL的邻苯基苯酚标准品做空白加标曲线的试验方法测定样品中邻苯基苯酚的含量。标准曲线的R2值为0.9998,标准曲线可用,并且准确测定了试样中邻苯基苯酚的含量。     

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