加速溶剂萃取-GC-MS/MS法检测土壤中5种有机氯农药残留

建立加速溶剂萃取(ASE)-气相色谱质谱联用(GC-MS/MS)法同时测定土壤中的5种常见有机氯农药(艾氏剂、狄氏剂、氯丹、七氯和五氯硝基苯)残留量的分析方法。选用乙酸乙酯-正己烷(1︰1, V/V)作为萃取溶剂,采用加速溶剂萃取仪对过筛后的土壤样品进行萃取、净化。通过优化质谱分析参数和加速溶剂萃取条件,样品于气相色谱质谱仪上运用多反应监测模式(MRM)进行分析,外标法定量。结果表明:5种有机氯农药在0.04～4.0μg/mL质量浓度范围内线性关系良好。检出限为:艾氏剂0.008 mg/kg,狄氏剂0.010 mg/kg,氯丹0.006 mg/kg,七氯0.006mg/kg,五氯硝基苯0.007 mg/kg。5种有机氯农药3个不同浓度点(0.2, 0.8和1.5 mg/kg)的加标回收率在86.9%～100.7%之间, 6针进样精密度测试相对标准偏差(RSD)小于5%。该方法前处理简单,定性及定量结果准确,适用于土壤中有机氯农药残留的监测。     

GCMS/MS 同时测定鱼样中39 种多溴联苯醚

目的 采用快速溶剂萃取(ASE)、系列固相萃取(SPE, 包括分散性固相萃取(DSPE)和串联SPE柱)和GCMS/MS, 建立一个便捷、高效测定鱼样中39种多溴联苯醚(PBDEs)的检测方法。方法 代表性鲈鱼样品(脂肪含量11%)经冷冻干燥后ASE提取, 然后采用DSPE去除脂肪和串联SPE柱净化, 最后采用GCMS/MS检测, 同位素内标法定量。结果 本方法的检测限(MDLs)为0.16~3.29 pg/g; 具有良好的线性范围(R2>0.998)、准确度(除BDE30为53%以外, 其他组分回收率为62%~1139%)和精密度(RSD<20%); 测定参考物质的结果均在标准值范围内, 与气相色谱磁场电场双聚焦高分辨质谱(GC/HRMS)测定结果一致。结论 本方法为鱼样中PBDEs检测提供了一个快速、简便和可靠的方法, 适用于对痕量PBDEs残留水平的食用鱼进行人体健康风险评价研究。     

GC-MS/MS同时测定鱼样中39种多溴联苯醚

目的采用快速溶剂萃取(ASE)、系列固相萃取[SPE,包括分散性固相萃取(D-SPE)和串联SPE柱]和GC-MS/MS,建立一个便捷、高效测定鱼样中39种多溴联苯醚(PBDEs)的检测方法。方法代表性鲈鱼样品(脂肪含量11%)经冷冻干燥后ASE提取,然后采用D-SPE去除脂肪和串联SPE柱净化,最后采用GC-MS/MS检测,同位素内标法定量。结果本方法的检测限(MDLs)为0.16～3.29pg/g;具有良好的线性范围(R2>0.998)、准确度(除BDE30为53%以外,其他组分回收率为62%～139%)和精密度(RSD<20%);测定参考物质的结果均在标准值范围内,与气相色谱磁场电场双聚焦高分辨质谱(GC-HRMS)测定结果一致。结论本方法为鱼样中PBDEs检测提供了一个快速、简便和可靠的方法,以便于日常监测和评估鱼中残留PBDEs对人体健康风险的研究。     

上海市淡水水产品中多溴联苯醚和多氯联苯的监测研究

目的了解上海淡水水产品中多氯联苯(polychlorinated biphenyls,PCBs)和多溴联苯醚(poly brominated diphenyl ethers,PBDEs)的污染状况,并进行相关的人体健康风险评估。方法水产品经冷冻干燥后,经加速溶剂萃取(accelerated solvent extraction,ASE)提取、分散固相萃取(dispersive solid phase extraction,D-SPE)除脂、串联固相萃取(solid phase extraction,SPE)深度净化后,用气相色谱-串联质谱(gas chromatography-tandem mass spectrometry,GC-MS/MS)检测。结果 14类97件样品中,PCBs的平均检出率为97%,PBDEs的平均检出率为61%~71%。∑_(51)(PCBs)的平均浓度值为2588 pg/g ww,范围为328~12724 pg/g ww,中位值为2135 pg/g ww,∑_(39)(PBDEs)的平均值浓度为454 pg/g ww,范围为56~2210 pg/g ww,中位值为294 pg/g ww。结论目前上海居民食用淡水水产品不会因PBDEs和PCBs残留而对人体健康构成危险,但对于大量食用鱼和虾的婴幼儿(一般指2~3岁)应适当减少食用量。     

加速溶剂萃取/凝胶渗透色谱净化/气相色谱-三重四极杆质谱测定水产品中的持久性有机污染物

建立了一种加速溶剂萃取/凝胶渗透色谱净化/气相色谱三重四极杆质谱同时检测水产品中46种典型持久性有机污染物的方法。水产样品经-105℃、100 mbar条件下的冷冻干燥处理后,加入硅藻土混合碾磨均匀后,经加速溶剂萃取、凝胶渗透色谱净化,使用萘-d、芴-d、蒽-d、■-d作为内标,采用气相色谱三重四极杆质谱的多反应监测模式对水产品中的16种多环芳烃、30种有机氯农药进行定性定量分析。在100℃、1500 psi条件下以二氯甲烷:己烷(1:1,V/V)对46种有机污染物进行萃取,收集凝胶渗透色谱中7.5~16 min馏出液,浓缩定容上机分析。46种持久性有机污染物分离效果良好,相关系数R^2均在0.99以上,低(10μg/kg)、中(50μg/kg)、高(100μg/kg)3个水平的加标回收率均在81.0%~121.0%之间,相对标准偏差(RSD,n=6)在4.1%~11.0%之间,方法检出限为0.0185μg/kg^0.7377μg/kg(干重)。该方法采用加速溶剂萃取仪和凝胶渗透色谱仪进行前处理,可实现前处理无人值守,大大提升检验效率,且方法稳定性好,灵敏度和回收率高,是分析水产品中痕量持久性有机污染物的较好方法。     

ASE/SPE-GC/MS测定17种含氯苯类有机污染物

建立加速溶剂-固相萃取-气质联用（ASE/SPE-GC/MS）法同时测定纺织固废物中17种氯苯类和氯甲苯类有机污染物（CCBs）的检测方法。加速溶剂萃取试验采用萃取溶剂丙酮∶二氯甲烷（1∶3）,萃取温度110℃,萃取压力11 MPa,循环萃取3次;采用固相萃取净化比较以Si和Florisil为填料的两类固相萃取柱在不同溶剂淋洗下对CCBs萃取效果的影响。结果表明,Si基质的固相萃取柱在二氯甲烷的洗脱下对CCBs回收率最高;以ASE/SPE-GC/MS法测得纺织固废物的回收率为80.0%～103.5%,相对偏差RSD(n=7)小于5.5%。     

加速溶剂萃取-气相色谱-质谱法检测谷物中农药多残留的研究

将加速溶剂萃取法和气相色谱-质谱检测法相结合,建立了一种测定谷物中农药多残留的新方法.优化了加速溶剂萃取(ASE)法提取谷物中农药多残留的条件,采用丙酮 正己烷(1 1)作为萃取剂,萃取温度为80 ℃,萃取压力为10.3 MPa.萃取液经过浓缩,过活性炭固相萃取(SPE)柱净化后,用气相色谱-质谱仪(GC-MS)检测,内标法定量.以大米和玉米为基质进行添加回收试验,结果表明:大米中的农药添加回收率为78.9%～105.3%,RSD≤12.8%;玉米中的农药添加回收率为80.9%～106.2%,RSD≤13.6%大米和玉米中农药的检出限(LOD)分别为0.3～3.6 μg/kg和0.3～4.0 μg/kg.     

加速溶剂萃取/气相色谱-串联质谱法检测棉织物残留农药

建立了加速溶剂萃取/气相色谱三重四级杆串联质谱(GC-MS/MS)检测棉织物中31种农药残留的方法。采用加速溶剂萃取进行提取,并优化了萃取溶剂的比率、萃取温度、萃取时间等萃取条件;采用QuEchERS法进行净化,GCMS/MS的多反应离子监测模式(MRM)进行定性定量检测。结果表明,本方法准确性和重复性好,灵敏度高,操作简便,适用于棉织物中多种农药残留的同时测定。     

河北省沿海地区鱼肉中多溴联苯醚的测定

目的建立气相色谱-负化学离子源-质谱法检测海产品中8种代表性多溴联苯醚(polybrominated diphenyl ether, PBDEs)的分析方法。方法冻干后的样品经加速溶剂提取,硅胶氧化铝复合层析柱净化后,采用气相色谱-负化学离子源-质谱(GC-NCI-MS)联用仪分析,内标法定量。结果不同地区海鱼中PBDEs的污染水平无显著差异,Σ_(3-7)BrPBDEs的平均值为24.0ng/g湿重,BDE209的平均值为20.7ng/g湿重。海鱼中BDE209的含量最高(占样品总量的46.2%),其次是BDE47(14.9%), BDE28(1.2%)的贡献率最低。结论 PBDEs污染水平虽然不高,但与沿海居民健康密切相关,应持续关注海域环境中生物体内PBDEs的污染状况。     

加速溶剂萃取-气相色谱法检测鱼粉中7种指示性多氯联苯方法研究

目的 建立采用加速溶剂萃取-气相色谱检测鱼粉中7种指示性多氯联苯残留的方法。方法 采用加速溶剂萃取法, 以正己烷-二氯甲烷(1:1, V:V)为提取剂对鱼粉样品进行提取, 提取温度为120 ℃, 压力为10 MPa, 静态提取时间为8 min, 循环提取2次。用浓硫酸进行净化后, 用气相色谱法进行分析测定。结果 多氯联苯在5~500 ng/mL浓度范围内线性关系良好, 相关系数为0.9986~0.9999, 方法定量限为3.0~5.0 μg/kg, 3个添加水平的平均回收率为85.5%~104%, 相对标准偏差为2.61%~8.26%。结论 本方法精密度好, 准确度高, 操作简单、快速, 适用于鱼粉中多氯联苯的定量检测。     

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.     

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     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.