气相色谱-三重四极杆质谱法测定人参中22种有机氯农残

目的建立气相色谱-三重四级杆质谱法(gas chromatography-triple quadruple mass spectrometry,GC-MS/MS)测定人参中22种有机氯农残的分析方法。方法参考《中华人民共参和国药典》2015年版,选择样品前处理方法,优化色谱质谱条件,建立22种有机氯农残的GC-MS/MS检测方法。结果 22种有机氯农药在2.5～1000μg/L范围内,线性关系良好,线性相关系数(r~2)为0.9992～0.9999;加标回收率良好为81.40%～118.29%,相对标准偏差(relative standard deviation,RSD)值为9.25%;重复性良好,RSD值为1.46%～3.28%;检出限为0.01～2.5μg/kg,定量限为0.03～8.63μg/kg。结论该方法能满足中国药典的检测要求,检测结果通过了中国食品药品检定研究院开展的人参中22种有机氯农残能力验证项目,表明本实验室具备该项目的检测能力,对人参及其它中药材中有机氯农残的监控,保障人们的安全食用和身体健康具有积极意义。     

磁性三维石墨烯复合材料的制备及其在有机氯农药残留检测中的应用

目的 建立磁性三维石墨烯复合材料(three-dimensional graphene nanocomposite,3DG)-磁固相萃取-气相色谱法同时测定水样中8种有机氯农药残留。方法 通过氧化还原自组装制备Fe3O4/3DG作为磁固相萃取技术的萃取材料,将其用于涡旋萃取样品中的有机氯农药残留,再用丙酮将其解吸,解吸剂经0.22μm滤膜过滤后,采用气相色谱-电子捕获器(gas chromatography-electron capture detector,GC-ECD)分离检测,外标法定量。结果 制备的磁性三维石墨烯复合材料兼具三维石墨烯高吸附性和Fe₃O₄强磁性。所建立的方法对8种有机氯农药的检出限范围为0.015～0.070μg/L,定量限范围为0.05～0.23μg/L,相对标准偏差为4.93%～9.42%, 8种有机磷农药在各自的线性范围内线性关系良好,线性相关系数r²>0.9950。将本方法应用于环境水样中有机氯农药残留的分析检测,加标回收率为75.1%～122.4%。结论 本方法操作简便、准确性好、...     

微柱固相萃取结合气相色谱-质谱法分析茶叶中有机氯农药

研制了碳纳米管微柱,建立了测定有机氯类农药的微柱固相萃取气相色谱-质谱法。样品泵入多壁碳纳米管微柱,8种有机氯类农药吸附保留到微柱,引入甲醇洗脱,气质联用选择离子监测方式检测洗脱液中有机氯类农药。考察了影响微柱固相萃取有机氯类农药的各种因素,包括样品流速、样品体积、洗脱剂种类、洗脱剂体积和碳纳米用量等。建立的方法适用于茶叶水提液中8种有机氯类农药分析,检出限0.015～0.25μg/kg。加标样品回收率74.5%～107.2%,相对标准偏差小于12%。     

分散固相萃取检测果蔬中有机氯和菊酯类农药残留

文章构建了一种以高岭土负载壳聚糖为净化剂的分散固相萃取-气相色谱法(GC-ECD)检测果蔬中甲氰菊酯、氯菊酯、高效氟氯氰菊酯、异菌脲、氟氰戊菊酯、S-氰戊菊酯、氟胺氰菊酯、溴氰菊酯8种有机氯和菊酯类农药残留。在净化剂用量0.15 g、净化时间3 min、NaCl用量1.5 g的条件下,有机氯和菊酯类农药的线性范围为0.010～0.20μg/mL(R²>0.999),检出限为4～8μg/kg,回收率范围在86%～110%,RSD≤10%。该方法操作简单、快速,材料制作简便,适用于检测果蔬中有机氯和菊酯类农药残量。     

气相色谱法测定茶叶中13种有机氯农药残留

利用气相色谱(GC)技术建立了茶叶中13种有机氯农药残留同时测定的方法。茶叶样品中有机氯农药残留通过乙腈溶液提取,浓缩后SPE(TPT)净化,采用乙腈-甲苯(3+1)溶液淋洗,收集经过液旋转蒸发后用正己烷进行溶剂交换,气相色谱-电子捕获检测器(GC-ECD)同时测定茶叶中13种有机氯。分析本方法茶叶样品在0.1μg/m L和0.5μg/m L两个添加水平的回收率为76.1%-111.5%和82.2%-106.2%,相对标准偏差分别为1.21%-25.9%和1.42%-11.0%。本方法灵敏、快速、准确、可靠,用于茶叶样品中常见有机氯农药残留测定,获得较好结果。     

QuEChERS结合气相色谱－负化学源质谱法测定蔬菜水果中37种农药残留

目的建立气相色谱-负化学源质谱法(gaschromatography-negativechemicalionization,GC-MS/NCI)测定果蔬中37种农药残留量的方法。方法蔬菜水果样品由乙腈提取、QuEChERS净化,采用GC-MS/NCI测定,外标法定量。结果在20～500μg/L范围内37种农药的线性良好(相关系数r20.995),所有农药的方法定量限在0.03～0.67μg/kg之间;芹菜和梨在0.01 mg/kg加标水平下, 37种农药的平均回收率范围为86.2%～110%且相对标准偏差(n=6)均小于10%。结论该方法简便、快捷、回收率及精密度好,可以成为检测果蔬中农药残留的常规检测技术,其建立的质谱条件也可以成为农药确证的另一手段。     

气相色谱法测定食用植物油中有机氯类农药残留

以大豆油为代表性基质,建立气相色谱测定食用植物油中18种有机氯农药残留的方法。测定方法为样品经过提取液（乙腈）超声提取,离心取上清液,上清液经C18填料净化,40℃旋转蒸干,加入1.00 mL正己烷复溶,用毛细管柱气相色谱分离,电子捕获检测器检测,以保留时间定性,峰高或峰面积定量。18种有机氯农药在5 ng/mL～60 ng/mL线性相关性良好,相关系数均大于 0.995,定量限为 5 μg/kg～16 μg/kg,在添加量为 5 μg/kg～20 μg/kg 的加标回收试验下,18种有机氯农药的加标回收率范围为80.3%～118.3%。精密度验证所得相对标准偏差为1.8%～12.7%。因此,该方法满足实验室要求,可用于定性及定量检测食用植物油中18种有机氯农药残留。     

GC-MS法测定罗汉果中有机氯农药残留量

建立气质联用(GC-MS)法检测罗汉果中甲体-六六六、乙体-六六六、丙体-六六六、丁体-六六六、对对位滴滴依、对对位滴滴滴、邻对位滴滴涕和对对位滴滴涕8种有机氯农药残留量。样品经有机溶剂超声提取,硫酸净化,选用HP-5MS毛细管柱对8种有机氯农药进行分离,外标法计算含量。结果表明:8种有机氯农药的线性范围为5~500μg/L,相关系数均大于0.999 0,方法最低检出限为1.15~2.64μg/kg,在3个浓度水平进行加标(100,150和250μg/L),加标回收率为87.3%~109.8%,相对标准偏差(RSD,n=6)为0.30%~11.76%。该方法操作简单、结果准确、灵敏度高,可用于罗汉果中8种有机氯农药残留的测定。     

凝胶渗透色谱净化:气相色谱法测定牛奶中10种有机氯农药残留

采用凝胶渗透色谱（GPC）对牛奶中10种有机氯农药进行样品净化处理,所使用的方法能使农药的提取和分配一次完成,凝胶渗透色谱柱使牛奶中的农药与脂肪等得到较好分离,在此条件下干扰物得到了很好的去除,并提高了分析速度.利用气相色谱-电子捕获检测器（GC-ECD）可以同时定性、定量地测定10种有机氯农药残留,在给定的浓度范围内,各农药组分呈现良好的线性相关,10种有机氯农药的平均回收率在85.57%～108.86%之间,变异系数小于10 88%,最小检测限范围为0.042～0.199μg/kg.     

QuEChERS-气相色谱法测定牛奶中24 种有机氯及菊酯类农药残留

建立QuEChERS快速净化结合气相色谱法测定牛奶中24 种有机氯及菊酯类农药残留的分析方法。样品经乙腈提取,QuEChERS法净化,气相色谱-电子捕获检测器分析,外标法定量。结果表明,待测物质在5～250 μg/L范围内线性关系良好,相关系数大于0.99,检出限为0.06～0.30 μg/kg,样品加标平均回收率为85.5%～111.2%,相对标准偏差为3.2%～10.8%。该方法简单、准确、高效,可用于牛奶样品中有机氯及菊酯类农药残留的快速筛查和定量检测。     

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