LC-MS/MS测定黄鱼中碱性嫩黄O及酸性橙Ⅱ

建立高效液相色谱-串联四极杆质谱正负离子切换模式同时快速测定黄鱼中黄色工业染料碱性嫩黄O及酸性橙Ⅱ的检测方法。样品匀质后,经乙腈提取,盐析,-20℃冷冻脱脂,低温离心后,取乙腈层采用高效液相色谱-串联质谱法分离、测定。结果表明碱性嫩黄O在0.5μg/kg~10μg/kg、酸性橙Ⅱ在5μg/kg~100μg/kg范围内呈良好的线性关系,高中低浓度回收率在70%~110%,相对标准偏差(n=5)小于15%,碱性嫩黄O、酸性橙Ⅱ检出限分别为0.5、5μg/kg。本方法适用于黄鱼中违禁工业染料碱性嫩黄O及酸性橙Ⅱ的测定。     

表面增强拉曼散射法快速检测饮料中碱性嫩黄O

基于表面增强拉曼散射光谱(surface-enhanced raman spectroscopy,SERS)技术建立饮料中碱性嫩黄O定性、定量快速检测方法。通过基质空白对照进行梯度浓度的碱性嫩黄O的SERS检测发现,在780 cm~(-1)处具有明显的碱性嫩黄O特征峰,特征峰强与碱性嫩黄O浓度呈现良好的线性关系,其中碳酸饮料中碱性嫩黄O和功能性饮料中碱性嫩黄O检测的线性范围分别为2.5~20μg/L与5~60μg/L,最低检出限分别为2.5μg/L和5μg/L,回收率分别为98.4%~104.1%,101.1%~102.7%,相对标准偏差均小于5%。该方法重现性较好、全程分析时间短、前处理方法简便、操作简单便、设备便于携带,可有效用于饮料中碱性嫩黄快速检验监督。     

固相萃取-液质联用同时检测豆制品中4种红黄色系工业染料

目的 以WAX固相萃取柱净化处理, 建立豆制品中违禁添加色素碱性橙Ⅱ、碱性嫩黄O、酸性橙Ⅱ和罗丹明B的前处理方法。方法 利用电喷雾离子源(ESI), 碱性橙、碱性嫩黄和罗丹明B采用正离子模式, 酸性橙采用负离子模式, 建立正负离子切换的多反应监测(MRM)的检测方法。结果 碱性橙Ⅱ、碱性嫩黄O的检出限为1.0 ?g/kg, 酸性橙Ⅱ和罗丹明B的检出限为0.5 ?g/kg, 方法回收率为84.2~95.1%, 相对标准偏差(RSD)小于4.5%。结论 建立的液质联用方法具有快速、灵敏、准确等优点, 可用于豆制品中上述4 种非法添加的红黄色系工业染料的同时测定及确证。     

液相串联质谱法测定豆制品中的碱性橙Ⅱ和碱性嫩黄O

建立同时测定豆制品中的碱性橙Ⅱ和碱性嫩黄O的液相串联质谱法。以乙醇为溶剂,经超声提取、离心分离,利用Oasis HLB固相萃取柱对样品进行净化,以0.1%甲酸水-0.1%甲酸甲醇溶液为流动相,LC-MS/MS测定碱性橙Ⅱ和碱性嫩黄O的含量。结果显示:在0～500 ng/mL内,碱性橙Ⅱ和碱性嫩黄O所得的回归方程均呈较好的线性关系,相关系数>0.995,检出限为碱性橙Ⅱ0.5μg/kg,碱性嫩黄O 0.8μg/kg。该方法的平均回收率为87.2%～94.5%,RSD为1.65%～4.08%。     

高效液相色谱-二极管阵列法测定豆制品中碱性嫩黄O的含量

研究了以高效液相色谱-二极管阵列法测定豆制品中的碱性嫩黄O含量的检测方法。采用Hypersil ODS-C18色谱柱,以4:6(V/V)的甲醇-0.5%乙酸铵溶液作流动相,流速1.0mL/min,用二极管阵列检测器于436nm波长下进行检测,并以保留时间和三维光谱图相似性系数进行定性。方法线性范围为0.25-50μg/mL(r=0.9999),在5.0g 样品中加入250μg标准物质的回收率及相对标准偏差(RSD)分别为95.0%(n=6)和1.5%(n=6)。     

HPLC法同时测定食品中酸性橙Ⅱ和碱性嫩黄O的含量

建立了同时检测食品中酸性橙Ⅱ和碱性嫩黄O两种非食用色素HPLC方法。样品经V(甲醇):V(水)=70:30超声提取,经C_(18)小柱净化后上样。色谱条件采用Kromasil C_(18)色谱柱(4.6 mm×150 mm,5μm),流动相为V(甲醇):V(50 mmol/L乙酸铵)=50:50溶液,流速1.0 m L/min,检测波长450 nm,柱温35℃。结果表明:酸性橙Ⅱ和碱性嫩黄O在进样浓度2.5~12.5μg/m L内呈良好的线性关系,线性方程分别为Y=2×10~6X-1 240.1(r=0.999 9),Y=7×10~6X-5 284.2(r=0.999 6),二者检出限分别为0.120和0.032 mg/kg,在5类食品中的加标回收率分别为80.33%~90.47%和80.17%~102.64%。经方法学评价和抽样分析,该方法简便准确,重复性好,可作为食品安全检测中同时检测酸性橙Ⅱ和碱性嫩黄O参考方法。     

食品中红2G、二甲基黄、二乙基黄工业染料的同时测定

建立了肉制品、豆制品、调味品中红2G、二甲基黄和二乙基黄的高效液相色谱及液相色谱—质谱联用测定方法。结果表明,红2G的检出限为0.5mg/kg,二甲基黄、二乙基黄的检出限均为0.1 mg/kg,回收率为80.7%~91.8%,相对标准偏差为3.8%~7.8%。     

高效液相色谱-串联质谱法测定豆制品中的二甲基黄残留量

目的建立高效液相色谱-串联质谱法(high performance liquid chromatography-tandem mass spectrometry,HPLC-MS/MS)测定豆制品中的二甲基黄的含量。方法豆制品经乙腈超声提取,经色谱柱Thermo C_(18)Acclaim RSLC分离,采用乙腈:水(85:15,V:V)作为流动相进行等度洗脱;质谱(electronic spray ion,ESI+)采用多离子监测模式(multiple reactions monitoring,MRM)对二甲基黄的定量离子和定性离子进行监测。结果本方法在5 min内可完成二甲基黄的分离分析。二甲基黄在10~500μg/L范围内具有良好的线性关系,在50、100和200μg/L 3个添加水平下的加标回收率为90.2%~94.2%,相对标准偏差为0.926%(n=9),方法的检出限为0.4μg/kg。结论该方法快速准确、灵敏度高,可适用于测定豆制品中二甲基黄的残留量。     

液相色谱-串联质谱内标法同时测定调味品中11种工业染料

本研究成功建立了QuEChERS净化液相色谱-串联质谱内标法同时测定调味品中11种工业染料（碱性嫩黄O、碱性黄、碱性橙21、碱性橙22、碱性橙2、罗丹明B、罗丹明6G、苏丹红Ⅰ、苏丹红Ⅱ、苏丹红Ⅲ和苏丹红Ⅳ）的分析方法。样品经乙腈提取,采用C18和PSA吸附剂净化后进行液相色谱-串联质谱分析,多反应监测（MRM）模式检测,内标法定量。结果表明,在0.5~100 μg/L范围内,方法呈现良好的线性关系（r>0.9976）,检出限在0.01~0.4 μg/kg之间。当实际样品中添加水平为5~200 μg/kg时,方法平均回收率为70.7%~105.0%,相对标准偏差（RSD）为0.1%~9.3%。应用本方法对50个批次的调味品进行测定,发现其中4个批次样品检出不同浓度的罗丹明B。该方法操作简便,快速准确,可以用于调味品中11种非法添加工业染料残留的测定。     

UPLC-MS/MS法测定食品中四种碱性工业染料

建立了超高效液相色谱-串联质谱法(UPLC-MS/MS)测定食品中碱性橙2、碱性嫩黄O、碱性紫5BN和罗丹明B四种碱性工业染料的分析方法。样品用乙腈提取,经WCX固相萃取柱净化后,采用Agilent Zorbax Eclipse Plus C_18柱(2.1 mm×50 mm,1.8μm)为分离柱,以乙腈和含0.1%甲酸的5 mmol/L乙酸铵溶液作为流动相,梯度洗脱。在电喷雾正离子模式下(ESI+),用多重反应监测(MRM)模式进行检测,基质匹配外标法定量。在优化的试验条件下,碱性橙2的检出限为0.2μg/kg,定量限为0.6μg/kg,碱性嫩黄O、碱性紫5BN和罗丹明B的检出限为0.1μg/kg,定量限为0.3μg/kg;碱性橙2、碱性嫩黄O、碱性紫5BN和罗丹明B的线性范围为1.0~50μg/kg,相关系数均大于0.99。在2,10和50μg/kg三个添加水平下平均回收率为86.5%~108.3%,相对标准偏差为2.01%~7.91%。该方法简单、灵敏度高、结果准确可靠,可用于食品中四种碱性工业染料的同时测定。     

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