固相萃取-高效液相色谱荧光法测定食用油中苯并(a)芘

建立固相萃取-高效液相色谱法测定食用油中苯并(a)芘的检测方法。样品经苯并(a)芘专用SPE小柱净化、浓缩,沃特世反相C18(150 mm×4.6 mm,5μm)色谱柱进行分离,流动相为乙腈:水(95:5,体积比),流量1.0 mL/min,激发波长384 nm,发射波长406 nm。结果表明,苯并(a)芘在浓度范围0.2~50μg/kg内线性良好,相关系数为0.999 9,最低检出限为0.1μg/kg,精密度RSD3%,回收率88.6%~101%。本方法快速便捷、准确率高、重现性好、可同时处理大量样品,为食用油中苯并(a)芘的测定提供参考。     

改进固相萃取-高效液相色谱法测定食用油中苯并(a)芘

目的建立改进固相萃取-高效液相色谱-荧光检测器检测食用油中苯并(a)芘的方法。方法以中性氧化铝作为食用油固相萃取前处理净化填料。样品经中性氧化铝固相萃取柱前处理净化后采用UltimateXB-C18色谱柱(250 mm×4.6 mm,5μm),以乙腈-水(88∶12,V/V)为流动相,流速为1.0 ml/min,柱温为30℃,进样量为10μl,在激发波长384 nm、发射波长406 nm处进行检测。试验过程中重点考察了不同含水量的中性氧化铝对油脂的去除效果和苯并(a)芘的回收率效果,最终筛选出含水量为6%的中性氧化铝作为检测食用油中苯并(a)芘的专用前处理净化填料。结果本方法的检出限为0.5 ng/g,线性范围0.5~100 ng/ml,加标回收率在91.2%~101.0%之间,相对标准偏差在2.2%~2.9%之间。结论该方法灵敏度高,选择性好,定量准确,适用于食用油中苯并(a)芘的准确检测。     

改进分子印迹固相萃取—高效液相色谱法同时 测定辣椒制品中4种苏丹红含量

目的建立分子印迹固相萃取—高效液相色谱法同时测定辣椒制品中4种苏丹红(苏丹红Ⅰ、Ⅱ、Ⅲ和Ⅳ)的含量。方法改进GB/T19681-2005食品中苏丹红染料的检测方法高效液相色谱法中的试样处理方法,使用Welchrom~?SDH分子印迹固相萃取小柱对多种辣椒制品基质进行净化,并采用Ultimate~?XB-C18(250 mm×4.6 mm, 5μm)色谱柱,以乙腈和水为流动相进行等度洗脱,于500 nm波长下测定。结果苏丹红Ⅰ、Ⅱ、Ⅲ和Ⅳ在0.1～10.0μg/mL范围内线性关系良好,相关系数r~2为0.9995～0.9999,回收率为88.9%～106.6%,检出限为0.01 mg/kg。结论该方法简便、灵敏度高、准确性好,适用于食品中4种苏丹红的定量分析。     

固相萃取–液相色谱–荧光检测法测定半夏中 苯并[a]芘残留量

目的建立半夏样品中苯并[a]芘残留量的固相萃取-液相色谱-荧光检测法。方法样品用水浸泡后,用正己烷萃取,硅胶固相萃取柱和ENV固相萃取柱净化,分析时采用SUPELCOSILTM LC-PAH(25 cm×4.6 mm,5μm)色谱柱分离,以乙腈-水(85:15=V:V)为流动相,荧光检测激发波长384 nm,发射波长406 nm,外标法定量。结果苯并[a]芘的检出限为0.1μg/kg,在1.0~50.0 ng/m L浓度范围内,苯并[a]芘的线性相关系数为0.9999,线性关系良好,方法回收率在78.0%~102.5%范围内,相对标准偏差低于9.6%。结论该方法准确、实用、简便、快速,在中药材的苯并[a]芘残留量检测方面有广泛应用前景。     

固相萃取-高效液相色谱法测定肉制品中苯并(a)芘

建立固相萃取-高效液相色谱法测定肉制品中苯并(a)芘的检测方法.样品经Cleanert BaP固相萃取柱净化、浓缩,Waters SunFire C18(4.6mm×250mm,5μm)色谱柱进行分离,流动相为乙腈-水(88∶12,V/V),流速1.0mL/min,荧光检测器,激发波长386nm,发射波长405nm.结果表明,苯并(a)芘在线性范围0.5～10ng/mL内,相关系数为0.9978,最低检出限为0.04μ g/kg,精密度(RSD)小于5％,回收率82.2％～94.9％.本方法快速简便、重现性好,可以用于肉制品中苯并(a)芘含量的测定,为肉制品的质量控制和安全评价提供保证.     

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。     

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。     

分子印迹固相萃取-气相色谱-串联质谱法测定油茶籽油中16种多环芳烃

为稳定可靠地分析油茶籽油中多环芳烃,建立了分子印迹固相萃取-气相色谱-串联质谱测定油茶籽油中16种多环芳烃方法。样品经正己烷溶解后,分别采用反相固相萃取HLB小柱、弗罗里硅土小柱和分子印迹固相萃取小柱对16种多环芳烃进行净化。以回收率和基质效应为考察指标评估3种固相萃取柱的净化,在此基础上,对净化液进行低温低速氮吹浓缩,多反应监测扫描模式下进行气相色谱-串联质谱检测,外标法定量。结果表明：分子印迹固相萃取小柱对16种多环芳烃的净化效果最佳;16种多环芳烃在质量浓度1～50μg/L范围内线性关系良好(R²≥0.995 1),检出限为0.01～0.20μg/kg,在2、10μg/kg和20μg/kg加标水平下的回收率为71.5%～116.3%,相对标准偏差为1.5%～13.8%。该方法具有灵敏度高、检出限低、重复性好等特点,适用于油茶籽油中16种多环烃的测定。     

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。     

金属有机骨架基质固相分散高效液相色谱法检测食用油中苯并[a]芘

目的建立基于金属有机骨架材料(metal-organic frameworks, MOFs) MIL-101(Cr)的基质固相分散进行食用油样品前处理,并以高效液相色谱串联荧光检测器(high performance liquid chromatography-fluorescence detector, HPLC-FLD)对苯并[a]芘进行定量检测。方法吸附后将体系装填于6 mL固相萃取空柱,以丙酮洗脱,氮气吹干定容。色谱流动相为乙腈-水(80:20, V:V),流速0.3 mL/min,激发波长369 nm,发射波长404 nm,外标法定量。结果苯并[a]芘在1～50ng/g范围内呈良好线性,相关系数r~2为0.9997,加标回收率为96.0%～99.9%。方法检测限及定量限分别为0.33ng/g和1.09ng/g,实际样品检测的相对标准偏差为2.8%～8.9%。结论该方法操作简单,测定结果准确,同时克服了常规固相萃取法易堵塞、渗漏、过载及负压过高等问题,可用于食用油中苯并[a]芘的检测。     

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