高效液相色谱法测定保健食品中5种雌性激素

目的 建立一种同时测定保健食品中5种雌性激素含量的高效液相色谱法。方法 样品经甲醇提取、C18色谱柱分离,以甲醇-乙腈-水(60:20:20)为流动相,在波长230 nm处进行测定。结果 雌酮、黄体酮、雌二醇、雌三醇及己烯雌酚在5～50μg/ml浓度范围内线性关系良好,相关系数(r²)≥0.999 91,回收率为90.0%～103.1%,相对标准偏差(RSD)为0.98%～1.27%,方法检出限为0.24～0.84 mg/kg,定量限为0.80～2.82 mg/kg。结论 该方法操作简便、样品分离效果好,定性可靠、定量准确、灵敏度高,可适用于保健品中非法添加雌性激素含量的测定。     

高效液相色谱-二极管阵列检测器-荧光检测器法测定植物油中的18 种多环芳烃

建立凝胶渗透色谱法净化样品、高效液相色谱-二极管阵列串联荧光检测器法同时测定植物油中18 种多环芳烃的检测方法。样品经环己烷-乙酸乙酯（1∶1,v/v）溶解,利用凝胶渗透色谱法去除油脂大分子,PAH C18柱分离,乙腈和水作流动相进行梯度洗脱,设置荧光检测程序,以2 个发射波长通道同时采集数据,测定油样中的17 种多环芳烃,以二极管阵列检测器测定苊烯。结果表明：方法检出限为0.5～4 ng/mL,样品回收率在78.65%～103.4%之间,相对标准偏差小于5%。本方法满足德国标准对18 种多环芳烃的同步检测新要求。     

反相高效液相色谱法测定调味品中7 种合成工业染料

建立测定调味品中7 种工业合成染料的高效液相色谱法。样品经乙腈超声提取后,10 000 r/min离心10 min,取上清液进行分析,以0.02 mol/L乙酸铵溶液和乙腈溶液为流动相进行梯度洗脱,二极管阵列检测器测定。结果表明：7 种工业合成染料的分离效果良好,回收率为86.8%～106.0%,相对标准偏差为1.07%～5.44% （n=5）;检出限为0.2～0.5 mg/kg。该方法操作简单快速,结果准确,重复性好,适用于调味品中7 种工业合成染料的同时测定。     

基于不同检测器高效液相色谱法测定食品中糖醇的研究

分析比较了口香糖、饮料样品中3种糖醇的2种测定方法。样品经水直接提取后一分为二,一份用配有示差折光检测器的高效液相色谱法检测,另一份用配有蒸发光散射检测器的高效液相色谱法检测。高效液相色谱法—示差折光检测法(HPLC-DRID)测定的木糖醇、山梨醇和麦芽糖醇的检出限(RSN=3)均为0.037 5g/100g,相关系数为0.999 21～0.999 29,加标回收率为91.5%～97.3%;高效液相色谱法—蒸发光散射检测法(HPLC-ELSD)测定的木糖醇、山梨醇和麦芽糖醇的检出限(RSN=3)为0.009 5～0.027 5g/100g,相关系数为0.999 3～0.999 6,加标回收率为91.2%～96.3%。结果表明:2种高效液相色谱法均能满足样品中3种糖醇的检测要求,而高效液相色谱法—蒸发光散射检测法的灵敏度要明显优于高效液相色谱法—示差折光检测法的,更适用于糖醇含量低的样品检测。     

高效液相色谱法测定番茄及其制品中番茄甙的含量

建立了固相萃取-高效液相色谱（HPLC）测定番茄及番茄制品中番茄甙的方法。样品中的番茄甙经过甲醇提取,PCX固相萃取法净化,乙酰化后,采用高效液相色谱法进行测定。以乙腈和水（90:10）为流动相,经过C18色谱柱分离,紫外检测器检测。结果表明:番茄甙的检出限为0.5mg/kg,方法回收率为90.5%～93.5%,相对标准差为1.7%～3.2%。该方法准确、灵敏、适用于番茄及番茄制品中番茄甙的测定。      

高效液相色谱法同时测定沙枣果实中5种酚类化合物

建立了高效液相色谱法检测沙枣果实中绿原酸、咖啡酸、香豆酸、肉桂酸和阿魏酸等5种酚类物质的方法。样品用乙腈超声提取,色谱柱为HypersilODS100mm×4.6mm（i.d）,5μm柱;流动相为乙腈和磷酸缓冲液（0.6%）,梯度洗脱;流速为1mL/min;检测波长为323nm和280nm;进样量为10μL。5种组分在一定范围内有良好的线性关系,相关系数为0.991～0.997,平均回收率为93.3%～98.1%,相对标准偏差为3.1%～7.4%（n=6）。结果表明：沙枣果实中绿原酸、咖啡酸、香豆酸、阿魏酸和肉桂酸的含量分别为0.472、0.373、0.425、0.529、0.381mg/kg。     

反相高效液相色谱法测定软骨中的II型胶原蛋白

建立了高效液相色谱法测定软骨中Ⅱ型胶原蛋白的方法。以ZORBAX300SB-C18为色谱分离柱,流动相:A为5%乙腈、0.05%TFA,B为80%乙腈（v/v）,采用线形梯度洗脱;检测波长:220nm;流速:1mL/min,柱温:35℃;进样量:10μL。该方法对Ⅱ型胶原的检出限为0.02mg/mL,线性范围20～250μg/mL,样品测定的变异系数为0.51%,加标回收率为99.13%～100.06%。该方法具有快速准确、重现性好、所需样品用量少、易于自动化的优点,从而为Ⅱ型胶原提供了一种新的测定方法。      

反相高效液相色谱法测定软骨中的Ⅱ型胶原蛋白

建立了高效液相色谱法测定软骨中Ⅱ型胶原蛋白的方法.以ZORBAX 300SB-C18为色谱分离柱,流动相:A为5%乙腈、0.05%TFA,B为80%乙腈(v/v),采用线形梯度洗脱;检测波长:220nm;流速:1mL/min,柱温:35℃:进样量:10μL.该方法对Ⅱ型胶原的检出限为0.02mg/mL,线性范围20～250μg/mL,样品测定的变异系数为0.51%,加标回收率为99.13%～100.06%.该方法具有快速准确、重现性好、所需样品用量少、易于自动化的优点,从而为Ⅱ型胶原提供了一种新的测定方法.     

高效液相色谱法测定南瓜粉中胡芦巴碱的含量

目的:建立高效液相色谱法测定南瓜粉中胡芦巴碱的方法.方法:甲醇超声波提取样品中的胡芦巴碱,色谱柱为Zorbax-NH2(4.6×150mm,5μm),流动相为乙腈-水(80∶20,V∶V),流速为1ml/min,检测波长为265nm.结果:胡芦巴碱浓度在5.01～101.4μg/ml内呈现良好的线性关系,相关系数r=0.9999(n=5);精密度实验RSD=0.31%(n=5);平均回收率为85.28%,RSD=4.4%(n=6);测定三个品系的30个样品中南瓜粉中胡芦巴碱的含量为0.1219～0.4836mg/g.结论:首次建立了高效液相色谱法测定南瓜中胡芦巴碱含量的方法,为南瓜功能性成分开发和遗传育种提供了理论依据.     

食品中苏丹色素的液相色谱分析方法

建立了食品中4种苏丹（sudan）色素的高效液相色谱同时测定方法。采用乙腈提取后经GPC对样品进行净化,利用反相高效液相色谱法,以乙腈-酸性水溶液为流动相,采用梯度洗脱,以二极管阵列检测器（PDA）定性定量测定食品中的4种苏丹色素,并以LC-MS对阳性样品中的苏丹成分进行了结构确证。结果证明,在添加浓度1～4mg/kg范围内,4种苏丹色素的回收率在81.92%～97.87%之间,相对标准偏差（RSD）≤5.23%,最低检出限（信噪比S/N=3）分别为0.102、0.097、0.074、0.099mg/kg。本方法经实际应用证明,具有良好的稳定性和重现性,步骤简单,可操作性强。      

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