全自动固相萃取-高效液相色谱法测定植物油中苯并（a）芘

建立了全自动固相萃取-高效液相色谱法测定植物油中苯并（a）芘的方法。采用正己烷作为提取溶剂,经分子印迹固相萃取柱净化,用二氯甲烷洗脱,按照优化的全自动固相萃取程序进行净化,将试样溶液注入高效液相色谱仪中进行检测,经Thermo Betasil C18柱分离,以乙腈-水=82:18为流动相,流速1.0 m L/min,柱温30℃,采用荧光检测器检测,激发波长384 nm,发射波长406 nm。结果表明,苯并（a）芘在0.5～20.0 ng/mL浓度范围内与峰面积具有良好的线性关系,相关系数为0.999 999,方法检出限为0.06μg/kg,定量限为0.2μg/kg,3个浓度水平下的平均加标回收率为92.2%～103.8%,相对标准偏差（n=6）为2.2%～6.0%。该方法可大批量、全自动化处理样品,工作效率高;减少检验人员与试剂接触机会,安全性高;降低人员操作误差,准确性高,适用于植物油中苯并（a）芘的测定。     

高效液相色谱法测定食用植物油中苯并(a)芘的研究

目的建立食用植物油中苯并(a)芘的固相萃取-高效液相色谱荧光检测器测定方法。方法样品以正己烷溶解,用3种不同苯并(a)芘专用固相萃取柱进行样品净化,经Waters PAH C18色谱柱分离后,用高效液相色谱荧光检测器测定,峰面积外标法定量食用植物油中苯并(a)芘含量。结果苯并(a)芘浓度在0~38.5 ng/m L范围内,浓度与色谱峰面积呈良好的线性关系,线性相关系数为0.9998,检出限为0.1μg/kg。在添加量为5.5~11.0.0μg/kg时,经3种Ba P专用SPE小柱处理的回收率均在91.7%~109.2%之间,测定结果的相对标准偏差为2.84%~3.26%(n=6)。结论以上几种处理方法均适用于食用植物油中苯并(a)芘的日常检测,但总体讲小柱3的实用性更强,并有更好的应用前景。     

油料中苯并（a）芘含量的测定

建立了固相萃取-高效液相色谱法测定油料中苯并(a)芘含量的方法。样品用正己烷提取,经苯并(a)芘分子印迹柱净化,采用Eclipse PAH色谱柱分离,经荧光检测器检测。结果表明:苯并(a)芘质量浓度在0. 5～20. 0 ng/m L范围内与峰面积线性关系良好,相关系数为1. 000 0,方法检出限为0. 05μg/kg,定量限为0. 18μg/kg,加标回收率为71. 9%～88. 0%,相对标准偏差为1. 24%～10. 11%。该方法简单、准确度高、重复性好,可用于油料中苯并(a)芘含量的检测。     

全自动固相萃取-高效液相色谱法测定熏烤肉制品中苯并(a)芘含量

建立全自动固相萃取-高效液相色谱法检测熏烤肉制品中苯并(a)芘的方法。样品经正己烷提取、分子印迹小柱净化,高效液相色谱-荧光检测器检测,流动相为乙腈-水（90∶10,V/V）,流速1.0 mL/min。结果表明：苯并(a)芘在0.0～45.2 ng/mL质量浓度范围内线性关系良好,相关系数（R2）为0.999 7,检出限为0.12 μg/kg,回收率为97.2%～100.2%,相对标准偏差为1.4%～2.6%。该方法灵敏度高,稳定性好,批处理速度快,接触有机试剂较少,适用于熏烤肉制品中苯并(a)芘残留量测定。     

不同前处理方法对植物油中苯并（a）芘测定的影响

建立直接萃取法、中性氧化铝柱法及分子印迹柱法3种前处理方法，用于高效液相色谱–荧光检测器法测定植物油中苯并（a）芘的含量。结果表明，在0.5～50 ng/m L浓度范围内，苯并（a）芘标准曲线浓度与其对应色谱峰面积线性关系良好，相关系数为0.999 3。以空白植物油样品为基质进行加标回收实验，当苯并（a）芘添加水平分别为2、15、25μg/kg时，直接萃取法、分子印迹柱法及中性氧化铝柱法的平均回收率分别为98.8%～102.8%、91.1%～101.0%及91.8%～113.7%，相对标准偏差（RSD）分别为0.8%～2.0%、2.3%～7.3%和1.9%～8.8%。直接萃取法前处理简单、精密度好、准确度及灵敏度高、成本低，适用于植物油中苯并（a）芘的检测。     

高效液相色谱法快速测定食用植物油中苯并（a）芘的研究

本文研究了食用植物油中苯并(a)芘的高效液相色谱检测法。用乙腈作为样品中苯并(a)芘的提取液,采用高效液相色谱-荧光检测器测定,外标峰面积法定量。结果表明,苯并(a)芘在0.5-20 ng/mL范围内呈良好的线性关系,相关系数为0.999 7。在空白样品中添加0.2μg/kg、5.0μg/kg、10.0μg/kg三个水平苯并(a)芘的回收率为95.8-101.3%,相对标准偏差(RSD)为1.72-10.13%,检出限为0.2μg/kg。本方法适用于食用植物油中苯并(a)芘的检测。     

LC-MS/MS检测ARA&DHA微胶囊粉剂中苯并(a)芘含量

建立高效液相色谱-串联质谱法检测二十二碳六烯酸(DHA)和二十碳四烯酸(ARA)微胶囊粉剂中苯并(a)芘的分析方法。样品经正己烷提取,经苯并(a)芘分子印迹柱净化,采用大气化学电离(APCI+),多反应监测模式扫描(MRM),外标法定量。该方法苯并(a)芘的检出限0.1μg/kg,线性范围0.3～50μg/kg,相关系数为0.999 8,加标样品(浓度0.5～15μg/kg)的平均回收率为84.3%～105.8%, RSD为5.8%～16.7%(n=6)。该方法前处理过程简单、快速,能满足检测需要,结果准确,可用于不同种类微胶囊粉剂中苯并(a)芘的测定。     

串联分子印迹固相萃取-高效液相色谱法测定食用油中苯并(a)芘

目的建立一种分子印迹固相萃取-高效液相色谱法测定食用油中苯并(a)芘的含量的分析方法。方法在GB 5009.27-2016《食品中苯并(a)芘的测定》试样处理方法基础上,进一步使用Welchrom~?Silica硅胶固相萃取小柱串联Welchrom~?BAP-2分子印迹固相萃取小柱对多种食用油基质进行净化。试样中目标物采用Ultimate~?XB-C_(18)(4.6 mm×250 mm, 5μm)色谱柱分离,以乙腈和水(88:12, V:V)为流动相进行等度洗脱,于激发波长370nm、发射波长425nm处进行检测。结果食用油试样经串联固相萃取小柱净化,除杂的效果好、回收率高。线性范围为1.0～100.0μg/mL,线性相关系数r在为0.9999,回收率在88.7%～101.3%之间,检出限为0.5μg/kg。结论本文建立的方法简便、灵敏度高、准确性好,适用于食品中苯并(a)芘的定性定量分析。     

凝胶渗透色谱-高效液相色谱联用测定食用植物油中苯并(a)芘

为建立凝胶渗透色谱-高效液相色谱联用技术测定食用植物油中苯并(a)芘残留量的分析方法,采用凝胶渗透色谱进行样品前处理,用反相高效液相色谱荧光法对样品中苯并(a)芘残留量进行测定,以保留时间定性、外标法定量。结果表明,苯并(a)芘在0～20μg/L范围内,其线性相关系数是0.9998,植物油样品的最低检出限为0.1μg/kg,加标回收率为88.3%～94.4%,相对标准偏差为2.3%～4.9%。该方法灵敏度高、准确度好,对5种不同浓度质控样品进行测试分析,均获得满意结果,说明本方法适用于食用植物油中苯并(a)芘的快速测定。     

分子印迹固相萃取高效液相色谱法测定植物油中苯并（a）芘的研究

研究了分子印迹固相萃取高效液相色谱法测定植物油中苯并(a)芘含量的方法关键点、加标回收率和精密度。方法关键点为确立荧光最优检测波长和选择无本底含量的试验试剂,可以提高方法的灵敏度和结果的准确性。苯并(a)芘的荧光最优激发波长为362 nm,发射波长为410 nm。试验试剂本身可能含苯并(a)芘,应优先选择同批次无本底含量的试验试剂。油茶籽油中低、中、高3个不同苯并(a)芘添加量的加标回收率分别为95.7%、94.5%和95.2%,植物油中低、中、高3个不同苯并(a)芘含量的测定结果相对标准偏差分别为1.4%、1.8%和2.1%。结果表明方法加标回收率高,精密度好。通过比较分子印迹柱和中性氧化铝柱净化效果,分子印迹柱的测定结果更加稳定,在实际检测应用中更有优势。将方法应用于植物油中苯并(a)芘测定能力验证,评价结果满意。     

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