高效液相色谱法检测茶叶中5种非法添加合成着色剂

建立使用高效液相色谱法检测茶叶中5种非法添加合成着色剂的方法。采用ZORBAX SB C18色谱柱（250 mm×4.6 mm,5μm）进行分离,以甲醇和0.02 mol/L乙酸铵为流动相进行梯度洗脱,二极管阵列检测器检测样品,检测波长为254 nm;确立样品的最佳前处理条件,采用聚酰胺吸附法提取合成着色剂。结果表明,5种合成着色剂在0.0～50.0μg/mL范围内具有良好的线性关系,样品的平均加标回收率为91.9%～97.8%;14个茶叶样品中均未检出柠檬黄、苋菜红、胭脂红、日落黄和亮蓝。该方法适用于对茶叶中添加柠檬黄、苋菜红、胭脂红、日落黄和亮蓝的测定,可为茶叶产品的质量控制提供一定的参考。     

固相萃取-高效液相色谱法在食品中合成着色剂检测中的应用

本文选取配制酒中常用的6种合成着色剂:柠檬黄、日落黄、胭脂红、诱惑红、苋菜红、亮蓝作为研究对象,利用科学合理的高效液相色谱法对它们进行检测,符合合成着色剂的检测要求。     

高效液相色谱法同时测定食品中10种合成着色剂

目的 建立一种高效液相色谱法同时测定食品中10种合成着色剂(柠檬黄、新红、觅菜红、靛蓝、胭脂红、日落黄、诱惑红、亮蓝、喹琳黄、赤藓红).方法 用GB/T 5009.35-2003(食品中人工合成着色剂的测定方法)中试样处理方法制备样品溶液,聚酰胺吸附法提取色素,以甲酵/乙睛(3+1)+乙酸铵(0.02 mol/L,pH =4.0)为流动相,梯度淋洗分离,多波长检测定量.结果 线性范围分别为柠檬黄、觅菜红、靛蓝、胭脂红、日落黄于0.94-30.00p.g/ml,新红于0.94～30.00μg/ml,诱惑红于1.00～32.10μg/ml,亮蓝于0.31～10.00μg/ml,喹琳黄于1.219.68μg/ml,赤藓红于0.76～24.40μg/ml,线性关系良好,相关系数0.999 0～1.000 0,回收率87.5% - 101.4%,RSD 1.3%～5.7%,检出限分别为0.03～ 0.9 mg/kg.结论 该方法简单、准确、灵敏,适用于食品中10种合成着色剂的定量分析.     

运动功能饮料中合成着色剂测定及全自动固相萃取仪的应用

建立了应用全自动固相萃取仪进行样品净化,高效液相色谱DAD检测器测定运动功能饮料中6种合成着色剂的方法。样品用去离子水稀释,经过固相萃取小柱净化后,经高效液相色谱仪DAD检测器测定。结果表明:6种合成着色剂3个水平(0.001、0.005、0.050g/kg)加标回收率为94.5%~100.9%,相对标准偏差为0.32%~1.02%(n=6),检出限分别为柠檬黄0.05mg/kg、日落黄0.1mg/kg、胭脂红0.1mg/kg、诱惑红0.1mg/kg、苋菜红0.1mg/kg、亮蓝0.1mg/kg。此方法具有简单、快速、准确等优点,适用于运动饮料中柠檬黄、日落黄、胭脂红、诱惑红、苋菜红和亮蓝的同时测定。     

高胶质食品中合成色素检测方法的改进

采用用聚酰胺吸附法、碱液直接提取法、碱性醇液提取法、饱和硼砂沸腾水浴提取法、海砂研磨法5种提取方法分别提取凤爪中的柠檬黄、苋菜红、胭脂红、日落黄、诱惑红和亮蓝6种色素,并用超高效液相色谱法测定。结果表明:5种提取方法中,海砂研磨法对凤爪中6种色素的提取效率最高;用选定的方法对超市中抽检的25个凤爪样品进行检测,发现样品中主要含有柠檬黄、日落黄和诱惑红,含少量胭脂红,不含苋菜红和亮蓝。     

高效液相色谱法同时测定肉制品中10种水溶性合成色素

建立了一种高效液相色谱法同时检测肉制品中日落黄、柠檬黄、苋菜红、胭脂红、诱惑红、新红、酸性红、赤藓红、靛蓝、亮蓝等10种水溶性合成色素的分析方法。样品经提取净化后注入高效液相色谱仪,根据保留时间定性,外标峰面积法定量。     

HPLC-DAD法同时检测饼干中10种合成色素

建立了食品中10种合成色素(柠檬黄、新红、苋菜红、胭脂红、日落黄、诱惑红、亮蓝、酸性红、赤藓红与酸性橙Ⅱ)的高效液相色谱法。本法定量检出限为:0.4~0.6 mg/kg,10种色素在1~20 mg/L范围内线性关系良好,相关系数均高于0.999,加标回收率为88.4%~96.1%,相对标准偏差为0.83%~5.24%。本方法检测简便、快速、准确、特异性强,非常适用于样品数量大、检测项目多的食品检测机构。     

高效液相色谱法测定饮料中12种水溶性合成着色剂

目的建立高效液相色谱法同时测定饮料中柠檬黄、喹啉黄、苋菜红、胭脂红、日落黄、诱惑红、酸性红、赤藓红、靛蓝、酸性绿S、亮蓝、专利蓝V 12种水溶性合成着色剂的方法。方法饮料样品经离心、过滤后直接进样,以甲醇-乙酸铵(0.02 mol/L)为流动相进行梯度洗脱,采用二极管阵列检测器多波长分析,外标法定量。结果 12种合成着色剂在0.5～100mg/L范围内线性关系良好,相关系数均大于0.999;检出限为0.05～0.3 mg/kg;平均回收率为91.0%～101.3%,相对标准偏差值为0.2%～2.3%。结论该方法简便、快速、准确,前处理简单,适合于基质成分较为简单的液体样品中多种着色剂的同时测定。     

固相萃取-HPLC-MS/MS法同时测定食品中6种人工合成着色剂

目的:建立食品中6种合成着色剂柠檬黄、苋菜红、胭脂红、日落黄、诱惑红、亮蓝的定性、定量分析方法。方法:样品经乙醇-水(v/v=1∶1)作为提取剂进行提取,聚酰胺固相萃取柱进行净化、浓缩后,以甲醇+10mmol/L乙酸铵为流动相,梯度洗脱进行分离,经ESI源(+)电离,多反应监测(MRM)定性和定量。结果:该方法检出限为5μg/kg~20μg/kg,回收率在81.1%~108.1%之间,相对标准偏差为0.9%~5.3%(n=6),标准曲线相关系数r~2为0.9944~0.9993。结论:本方法准确度高,具有良好的重现性和精密度,适用于食品中6种人工合成着色剂的确证和定量分析。     

HPLC同时测定熟肉制品中8种合成着色剂

目的建立一种高效液相色谱法(HPLC)同时测定熟肉制品中8种合成着色剂(柠檬黄、新红、苋菜红、胭脂红、日落黄、诱惑红、亮蓝、赤藓红)的方法。方法将熟肉样品搅碎,加水、均质;亚铁氰化钾溶液、乙酸锌溶液除蛋白质,石油醚除脂肪;聚酰胺粉吸附纯化,制备供试品溶液。采用AgilentZORBAX SB-C18色谱柱(4.6 mm×250 mm,5μm);以甲醇-乙酸铵溶液(0.02 mol/L)为流动相进行梯度洗脱;检测波长为254nm。结果该方法能同时测定熟肉制品中8种合成着色剂,回归方程相关系数(r)均大于0.99994,加标回收率为83.0%～97.9%之间,检出限为0.008～0.028μg/ml。结论该方法准确可靠、干扰小、灵敏度高、有较好的重复性,适合测定熟肉制品中合成着色剂。     

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