气相色谱法测定皮革中的戊二醛含量

采用气相色谱法测定皮革中的戊二醛含量,研究萃取条件、测试条件对检测结果的影响,优化检测条件和仪器分析条件,研究检测方法的枪出限、回收率等.实验结果表明:戊二醛的回收率在82％以上.GC/MS方法检出限为4.0 mg/kg,GC-FID方法检出限为25 mg/kg,GC/MS法的检出限远远低于GC-FID.     

气质联用法测定纺织品中的含氯农药残留

对纺织品中三种含氯有机农药（十氯酮,乙滴涕,碳氯灵）残留量的萃取和检测方法进行了研究.讨论了萃取时间、温度、溶剂、萃取方式对回收率和精密度的影响。试验结果表明水浴振荡萃取回收率要优于超声萃取和索式萃取,在萃取条件为时间45 min、温度35 ℃、萃取溶剂为乙酸乙酯时有最高回收率。气相色谱 质谱联用技术可同时对三种农药残留量进行定性与定量测定。十氯酮,乙滴涕,碳氯灵的最低检出限分别为0.1,0.02,0.06 mg/L。方法的准确度评定实验表明在0.5～2.0 mg/kg的添加水平下总体回收率51.0%～98.0%,相对标准偏差1.79%～7.47%。     

GC-MS内标法同时测定鞋材中邻苯基苯酚和含氯苯酚残留量

通过优化样品萃取条件、衍生化条件和色谱分析条件,建立了GC-MS法同时测定鞋材中邻苯基苯酚和含氯苯酚残留量的方法。采用1 mol/L KOH溶液为溶剂,超声辅助萃取鞋材中酚类化合物,滤液经乙酸酐衍生化、正己烷萃取后,供气相色谱-质谱确证和测定,内标法定量。结果表明：该方法简便快捷、回收率稳定,灵敏度高、重现性好,在0.05～1.00 mg/kg的含量范围内,线性相关系数均大于0.998 7,在3个不同添加浓度水平下,方法的平均加标回收率为84.63%～115.61%,相对标准偏差为1.09%～4.05%,检出限为0.05 mg/kg,可满足进出口鞋材中20种酚类物质同时检测需求。     

微波萃取-高效液相色谱法测定食品塑料包装材料中双酚A含量

建立了微波萃取-超高效液相色谱法(MAE-HPLC)检测塑料包装食品中双酚A的分析方法。选择甲醇为萃取溶剂,对微波萃取条件进行了优化,结果表明最佳的萃取条件为:萃取温度为80℃,萃取时间为20min。在试验选定的最佳条件下,方法线性范围0.10~20mg/L,相关系数为0.9998,方法检出限为0.1 mg/kg,样品加标回收率为88.9%~99.6%,相对标准偏差小于2.2%。     

衍生气相色谱法测定中性笔墨水中甲醛含量

本文建立中性笔墨水的直接提取,2,4-二硝基苯肼衍生,二硫化碳萃取后用气相色谱检测的方法,对提取方法、衍生化条件、萃取溶剂选择以及气相色谱条件进行了研究,确定了甲醛检测的最佳条件。研究数据显示,该方法对中性笔墨水甲醛的检出限为0.5mg/kg,在0.4mg/L~50.0mg/L的浓度范围内,线性相关系数为0.9994,添加回收率在92%~101%之间,重复性标准偏差在3.1%~4.2%之间。结果表明本方法简便、快速、检出限低、回收率高、重复性好,抗干扰能力强。     

UPLC-UV法快速测定烟草中游离茄尼醇的含量

为了简化烟草样品的前处理步骤,采用甲醇直接萃取烟草样品得到甲醇萃取液,优化超高效液相色谱的测试条件,测定了甲醇萃取液中的茄尼醇含量.结果表明:①最佳萃取条件为:萃取溶剂为甲醇,萃取温度25℃,萃取时间20 min;②茄尼醇工作曲线的浓度范围为10～200 mg/L时,质量浓度与峰面积具有良好的线性关系,相关系数为0.9997;③方法的检出限为0.054 mg/L,相对标准偏差为2.1％,平均回收率为105.5％.该方法可以快速、简便、准确地测试烟草中游离茄尼醇的含量.     

超声波提取-气相色谱法测定食品包装材料中的有机磷酸酯

建立了食品包装材料中三（1,3-二氯丙基）磷酸酯、磷酸三氯丙酯2种有机磷酸酯含量测定的气相色谱检测方法。对前处理过程中超声波萃取条件进行优化：选择丙酮为萃取溶剂,用量为20mL,萃取时间为30min。试验结果表明：2种有机磷酸酯的线性范围为0．1～50mg/L,检出限为0．04mg/kg,方法的加标回收率为89．2％～96．2％,相对标准偏差为2．62％～4．78％。     

纺织品游离芳香胺4,4’-二氨基二苯甲烷的测定

通过研究不同溶剂、不同萃取方式以及不同萃取温度和不同萃取时间,对含有游离态4,4’-二氨基二苯甲烷的阳性样品萃取结果的影响,初步建立了用高效液相色谱测定纺织品游离芳香胺的方法。试验结果表明,用甲醇溶剂在50℃的温度条件下,超声萃取15分钟萃取的效果最佳,其方法在0.2mg/L～50mg/L的浓度范围内与峰面积线性关系良好,不同基质中不同添加水平回收率为71.58%～97.27%,RSD为2.19%～7.12%。     

气相色谱-质谱联用法检测动物源性食品中的敌鼠

目的建立气相色谱-质谱联用法(gas chromatography-mass spectrometry,GC-MS)测定动物源性食品中敌鼠的方法。方法本研究考察了提取溶剂、萃取参数及净化小柱对检测结果的影响,样品用丙酮-正己烷(1:1,V:V)为提取溶剂进行微波萃取,采用C18小柱进行净化,以GC-MS进行检测。结果加标水平为0.001、0.002、0.01 mg/kg时,平均回收率为62%~90%,相对标准偏差为0.98%~9.04%,敌鼠的方法检出限为0.0008 mg/kg.结论该方法快速、简单,且灵敏度高,适用于动物源性食品中的敌鼠的检测。     

纺织品中可革取铅原子荧光法测定研究

模拟人体表面温度及酸度，用人工酸性汗液萃取样品，用氢化反应-原子荧光法对提取汗液中的铅进行测定，优化氢化反应条件，给出合适的荧光谱分析参数，建立了铅的检测方法。测试结果表明，该方法的检出底限为0．06mg／kg，满足生态纺织品标准对纺织品中可萃取铅0．2mg／kg的限量要求。选取多种纺织纤维，进行标准添加回收试验，回收率在82％～105％之间，标准偏差（RSD）小于10％。     

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