超声波提取- 液相荧光法测定水果中壬基酚聚氧乙烯醚及其降解产物

为建立超声波提取热带水果中环境激素壬基酚聚氧乙烯醚及降解产物壬基酚、液相荧光法测定残留量的方法,对超声提取的温度、时间、功率进行条件优化,提取液经净化浓缩后,用C18 色谱柱进行分离,液相色谱荧光法进行测定。结果表明：样品中壬基酚聚氧乙烯醚及壬基酚在0.5～50μg/mL 范围内线性良好,检出限分别为0.04mg/kg 和0.008mg/kg,方法回收率分别为92%～102% 和75%～92%。该方法快速灵敏、准确度高,符合残留检测的要求。     

婴幼儿配方乳粉中壬基酚检测

试验旨在采用气相色谱-质谱联用法测定婴幼儿配方乳粉中壬基酚的含量。最佳试验条件是采用乙腈作为样品的提取溶剂,使用弗罗里硅土作为试验用净化固相萃取小柱,经衍生化,用气相色谱-质谱联用仪测定;测得壬基酚各同分异构体的检出限在0.055～0.51μg/kg之间;标准曲线范围在5～250μg/L之间,线性关系在0.998以上;加标浓度在0.003～0.3 mg/kg范围内的回收率为67.5%～107.2%,方法的精密度为0.54%～7.51%(n=6)。该方法具有提取简单、灵敏度高、回收率好、重复性好等优点。实现了大批量婴幼儿配方乳粉中壬基酚的定性定量检测,满足了市场上婴幼儿奶粉中质量监督检查的需要。     

食品用塑料包装中壬基酚迁移量的检测

建立高效液相色谱-串联质谱法测定食品用塑料包装中壬基酚的迁移量。样品经迁移试验得食品模拟物,水性模拟物直接上机,油基模拟物经甲醇提取、冷冻离心后取上清液分析,外标法定量。在本试验条件下,壬基酚线性关系良好,6种模拟物的相关系数都达到0.998 5以上,两类模拟物的检出限分别为0.01 mg/L和0.01 mg/kg,回收率为89.3%～94.4%,RSD值为2.76%～3.37%。该法简单、灵敏、准确,适用于食品用塑料包装中壬基酚迁移量的检测。     

气相色谱质谱-内标法测定植物油中9种农药的残留量

目的建立植物油中9种农药残留量的内标检测方法。方法样品用乙腈提取,经优化的Qu ECh ERS方法净化,气相色谱-质谱联用仪测定,内标法定量。结果氟乐灵、甲拌磷、七氯、倍硫磷、反-氯丹、顺-氯丹的线性范围为0.005~0.2 mg/L,检出限为0.01 mg/kg;α-硫丹、β-硫丹的线性范围为0.01~0.2 mg/L,检出限为0.02 mg/kg;多效唑的线性范围为0.02~0.2 mg/L,检出限为0.04 mg/kg。结论本方法准确度高、重复性好,前处理无需特殊仪器,且内标物的引入进一步降低了前处理的操作难度,为方法的推广创造了更好的条件。     

固相萃取净化-高效液相色谱测定水果中赤霉素、多效唑、烯效唑残留量

建立了一种简单、快速,同时检测水果中赤霉素、多效唑和烯效唑残留量的固相萃取-高效液相色谱(SPE-HPLC)方法。该方法经80%甲醇水提取样品,C18固相萃取小柱净化,采用DAD检测器220 nm紫外扫描检测。结果表明:3种植物生长调节剂在0.5¹0μg/mL内线性关系良好(r≥0.999);检出限分别为赤霉素0.002 mg/kg、多效唑0.04 mg/kg、烯效唑0.02 mg/kg;在0.210μg/mL内线性关系良好(r≥0.999);检出限分别为赤霉素0.002 mg/kg、多效唑0.04 mg/kg、烯效唑0.02 mg/kg;在0.2⁰.8 mg/kg加标水平下,3种植物生长调节剂平均回收率为78%0.8 mg/kg加标水平下,3种植物生长调节剂平均回收率为78%⁹1%;相对标准偏差为2.4%91%;相对标准偏差为2.4%⁵.4%。     

高效液相色谱-串联质谱法测定食品塑料包装材料中双酚A和壬基酚

目的:基于高效液相色谱—串联质谱技术,建立一种检测食品包装材料中双酚A和壬基酚的方法.方法:用不同的提取溶剂和提取方法提取标准样品中的双酚A和壬基酚,以目标物的提取量为指标确定最佳提取溶剂和提取方法,在此基础上考察固相萃取柱、上样溶剂、淋洗溶剂及洗脱溶剂对净化效果的影响.样品以二氯甲烷为溶剂超声提取后经硅胶固相萃取柱净化,用Venusil MPC₁₈(2)色谱柱(100mm×2.1mm,2.6μm)进行分离,以0.1%氨水和甲醇为流动相进行梯度洗脱,在ESI负离子扫描模式下采用多反应监测模式测定,内标法定量.结果:双酚A和壬基酚在1.0～200.0μg/L范围内均具有良好的线性关系,相关系数R>0.999,在1.0,10.0,200.0μg/kg3个加标水平下的平均回收率为89.2%～101.2%,相对标准偏差(RSD)为3.1%～6.2%.方法的检测限和定量限分别为0.5,1.0μg/kg.结论:该方法操作简单、准确、灵敏,可适用于食品包装材料中双酚A和壬基酚含量的测定.     

微波提取高效液相色谱法测定花菜中的V_C

研究微波辅助提取,反相高效液相色谱测定花菜中VC含量的方法。花菜匀浆后,以1%草酸溶液为提取溶剂,微波提取、固相萃取小柱净化后,采用恒流的方法进行液相色谱定量检测,以0.1%草酸溶液为流动相,流速1.0 m L/min,采用C-18反相色谱柱分离,在254 nm波长下检测。结果表明VC浓度在0.02 mg/m L~0.12 mg/m L范围内线性良好,相关系数为0.999 6,检测限0.02 mg/kg,回收率在99.9%~104.6%之间,相对标准偏差为1.20%。该方法能有效提取蔬菜中Vc,测定结果稳定,准确度高,重现性好,可以用于蔬菜中VC的检测。     

气相色谱-质谱法检测湘式挤压糕点中4种光引发剂

目的建立气相色谱-质谱法测定湘式挤压糕点中4种光引发剂的方法。考察不同提取溶剂及净化方式对检测结果的影响。方法试样经丙酮-正己烷超声提取,采用PSA管进行净化,采用EI源以气相色谱-质谱法进行检测。结果添标水平为0.005～0.02 mg/kg时的平均回收率在85%～110%间,相对标准偏差为5.7%～9.1%,4-氯二苯甲酮的方法检出限为0.008 mg/kg,其余3种光引发剂的检出限为0.005 mg/kg。结论该方法快速,简单,灵敏度高,符合检测方法参数的确认要求。     

高效液相色谱串联质谱法测定纺织品中六溴环十二烷

采用高效液相色谱串联质谱法研究并优化纺织品中三种六溴环十二烷(HBCD)的检测方法。纺织样品经过丙酮自动索氏提取、浓缩、甲醇定容,采用HPLC-MS/MS对三种HBCD进行检测。HPLC-MS/MS的优化条件为:流动相V(甲醇)∶V(乙腈)∶V(水)=40∶40∶20,三种HBCD的定量离子和辅助定性离子对为:m/z 640.6/80.8和m/z 640.6/78.9。待测物质量浓度为0.01～0.50 mg/L时,线性相关系数大于0.999,α-HBCD、β-HBCD和γ-HBCD的测定低限分别为0.01 mg/kg、0.02 mg/kg、0.02 mg/kg,空白样品的加标回收率在85%～105%。     

食品中16种邻苯二甲酸酯类塑化剂的GC-MS检测方法研究

建立了同时测定不同类别食品中16种邻苯二甲酸酯类塑化剂的气相色谱-质谱(GC-MS)分析方法。对各种类别的食品采取不同的分离、净化方法;含油类样品经正己烷提取后,提取液用GPC凝胶色谱仪进行净化;采用GC EI/MS的选择离子检测方式(SIM)进行定性和定量分析。16种邻苯二甲酸酯的质量浓度在0.02~5 mg/L范围内呈良好线性,相关系数不低于0.999,检出限(S/N=3)为0.02 mg/kg。在0.4~2 mg/kg加标水平下的该方法回收率为75%~115%,相对标准偏差(RSD,n=3)为1.00%~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.     

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.