HPLC法测定成蛋、皮蛋黄中的四种苏丹红染料

采用高效液相色谱(HPLC)法测定咸蛋、皮蛋中的四种苏丹红染料.测定结果表明,苏丹红Ⅰ、Ⅱ、Ⅲ、Ⅳ在0～0.5mg/L时其峰面积与进样质量浓度呈良好的线性关系,其线性相关系数为0.9999、0.9995、0.9999和0.9999(n=6),加标样品测定的相对标准偏差(RSD)为1.1%、2.2%、1.9%和2.4%(n=6).苏丹红Ⅰ、Ⅱ、Ⅲ、Ⅳ的最小检出限均为10μ/kg.苏丹红Ⅰ、Ⅱ、Ⅲ、Ⅳ回收率均为90%～105%.结果显示:该方法快速、灵敏、可靠,具有简便、重现性好的特点.     

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-超高效液相色谱法同时测定辣椒制品中非法添加苏丹红染料

目的 建立了一种同时测定辣椒干、辣椒酱、辣椒油等辣椒制品中非法添加4种苏丹红染料（苏丹红Ⅰ、苏丹红Ⅱ、苏丹红Ⅲ、苏丹红Ⅳ）的固相萃取-快速液相色谱分析方法。方法 样品经正己烷超声提取,提取液经ProElutTMSDH苏丹红专用柱净化富集,采用Agilent ZORBAX Eclipse Plus C18柱(4.6 mm×100 mm, 3.5 μm)以乙腈-水为流动相梯度洗脱分离,二极管阵列检测器测定,检测波长为500 nm（苏丹红Ⅰ、Ⅱ、Ⅲ）、520 nm（苏丹红Ⅳ）,利用保留时间和光谱图定性,外标法定量。结果 表明,苏丹红Ⅰ~Ⅳ可在6.5 min内实现完全分离,4种目标物在0.1~5.0 μg/L范围内线性关系良好,相关系数（r）均大于0.9999;方法的检出限为8~15 μg/kg,定量下限为26~48 μg/kg。在0.05、0.3、1.5、4.0 mg/kg的加标回收率为84.4%~98.5%,相对标准偏差为0.3%~5.7%(n=6)。结论 该方法操作简便、准确、快速、灵敏、稳定,易推广应用于常规实验室辣椒制品中非法添加苏丹红染料的检测。     

辣椒制品中的苏丹红检测方法的优化

优化了辣椒及其制品中苏丹红Ⅰ~Ⅳ的检测方法。样品经固相萃取净化后,以乙腈和0.75%的乙酸水为流动相,梯度洗脱,经C18柱分离,于500nm波长下检测。结果表明:苏丹红Ⅰ~Ⅳ在0.08~2.56μg/mL时有良好的线性关系,在添加浓度为0.15~1.28μg/mL时,辣椒粉中苏丹红Ⅰ~Ⅳ回收率为86.2%~97.7%;辣椒油中苏丹红Ⅰ~Ⅳ回收率为87.2%~94.8%;辣椒酱中苏丹红Ⅰ~Ⅳ回收率为82.7%~92.0%。苏丹红Ⅰ~Ⅳ的检出限分别为0.03,0.05,0.03,0.06μg/mL。实验表明:优化后的方法比国标GB/T 19681-2005方法耗时短,灵敏度高,简便,重现性好,适于实验室的日常检测。     

固相萃取-液质联用测定辣椒粉中苏丹红

该试验建立了分子印迹固相萃取-超高效液相色谱-串联质谱法检测辣椒粉中苏丹红Ⅰ、Ⅱ、Ⅲ、Ⅳ的方法。辣椒粉样品经过正己烷提取,氮吹浓缩,苏丹红专用分子印迹固相萃取柱净化和富集,以体积分数为0.2%的甲酸水溶液和乙腈为流动相梯度洗脱,经Agilent ZORBAX Eclipse Plus C₁₈(2.1 mm×50 mm,1.8μm)柱分离,ESI+电喷雾模式扫描,MRM多反应模式监测,外标法定量。结果显示,该方法下4种苏丹红的检出限均为5μg/kg,4种化合物在0~50μg/L质量浓度范围内线性关系良好,相关系数均在0.9990以上;当加标浓度为10,50和100μg/kg时,回收率在86.5%~102.2%之间,相对标准偏差均小于6.0%。该方法可为辣椒粉中4种苏丹红的定性定量分析提供参考。     

HPLC法同时检测辣椒制品中8种非食用红色色素

建立了凝胶柱净化-高效液相色谱法同时检测辣椒制品中苏丹红Ⅰ、苏丹红Ⅱ、苏丹红Ⅲ、苏丹红Ⅳ、对位红、苏丹红G、苏丹红7B和苏丹红B等8种红色色素的方法。样品用正己烷或正己烷/丙酮提取,提取液经BioBeadsS-X3凝胶柱净化。净化后的样品采用ZorbaxSBC18柱分离,以0.1%甲酸水溶液(A)和含0.1%甲酸的甲醇丙酮(9∶1,V/V)溶液(B)为流动相,流速1mL/min,检测波长505nm。上述8种色素组分在其质量浓度为0.16～2.56mg/L时有良好的线性关系,方法的检测限为15～46μg/kg;平均加标回收率为89.9%～118.2%,相对标准偏差为2.3%～4.8%。该方法灵敏可靠,适合于辣椒制品中多种脂溶性红色色素的同时检测。     

辣椒制品中苏丹红Ⅰ～Ⅳ号检测方法比较研究

实验选用高效液相色谱法(HPLC)和液相色谱-质谱联用法(LC-MS)两种方法对辣椒制品中苏丹红Ⅰ～Ⅳ号进行了分离和检测.HPLC法选用229 nm作为苏丹红Ⅰ～Ⅳ号的检测波长,其工作曲线的线性范围较宽,分别为0.625 ng～2000 ng(R2=1)、2.5 ng～2000 ng(R2=1)、5 ng～2000ng(R2=0.998 9)和5 ng～2000 ng(R2=0.999 0),苏丹红Ⅰ～Ⅳ号的检测限分别为1.88μg/kg、2.5μg/kg、6.25μg/kg和10μg/kg,适合含量较高的样品检测.LC-MS法在质核比(M/Z)为249.05、277.10、353.10和381.15的条件下分别对苏丹红Ⅰ～Ⅳ号进行MS检测,其工作曲线线性范围较窄,苏丹红Ⅰ～Ⅲ为0.10 ng～5 ng(R2≥0.999 7),苏丹红Ⅳ号为0.25 ng～5 ng(R2=0.999 8),苏丹红Ⅰ～Ⅳ号的检测限均为1μg/kg,更适合微量样品的检测.两种方法均具有简单、快速的特点.     

高效液相色谱法测定红辣椒及其产品中苏丹I、苏丹Ⅱ、苏丹Ⅲ、苏丹Ⅳ

建立了采用高效液相色谱测定红辣椒及其产品中苏丹Ⅰ、苏丹Ⅱ、苏丹Ⅲ、苏丹Ⅳ等苏丹染料的方法.采用石油醚提取、氧化铝柱净化,高效液相色谱法测定,方法线性范围为0～4000ng,线性相关系数除苏丹Ⅳ为0.9998外,其余均为0.9999, 平均回收率87.1%～106.7%,相对标准偏差8.64%～10.5%.对苏丹Ⅰ、苏丹Ⅱ、苏丹Ⅲ、苏丹Ⅳ的检出限分别为2、4、9、15ng.     

三种专用固相萃取柱-高效液相色谱法检测食品中苏丹红含量

建立了专用固相萃取柱-高效液相色谱法检测食品中苏丹红Ⅰ、Ⅱ、Ⅲ、Ⅳ的方法。样品经过正己烷提取,通过苏丹红专用固相萃取柱净化和富集,40℃水浴旋蒸至干后用甲基叔丁基醚-甲醇(体积比4:6)溶解定容,借助Waters Symmetry C₁₈色谱柱(150 mm×4.6 mm,5 μm)分离,以乙腈-水为流动相梯度洗脱,二极管阵列检测器检测,外标法定量。结果表明,四种苏丹红在0.16~2.56 μg/mL内线性相关系数(r)均大于0.9999,不同食品的检出限在2.3~9.7 mg/kg之间。不同品牌的苏丹红专用固相萃取柱去除基质干扰和富集目标物的能力不同,可根据食品种类选择合适的固相萃取柱。ProElut SDH SPE柱普遍适用于不同种类食品的前处理;CNW Poly-sery MIP-SDR SPE柱适用于除辣椒粉以外的大部分食品的前处理;Cleanert Sudan SPE柱适用于浅色、低油脂食品的前处理。对六种食品加标2.0 mg/kg,经过ProElut SDH SPE柱处理后,回收率为83.7%~91.1%,相对标准偏差为2.4%~6.2%(n=6)。该方法净化和富集效果理想,与GB/T 19681-2005相比,具有操作简便、重复性好、准确度高、分析时间短、节省溶剂等特点。     

高效液相色谱法测定棕榈油中苏丹红、对位红

样品经己烷溶解,再用乙腈萃取浓缩,经乙腈 异丙醇(1∶1)溶解过滤后,用反相高效液相色谱法-DAD检测器进行检测。方法最低检测限:苏丹红Ⅰ、苏丹红Ⅱ、苏丹红Ⅲ、苏丹红Ⅳ和对位红检测限均为10μg/kg,相对标准偏差为1.85%～5.74%,回收率为93.42%～108.38%。该方法简便、快速,稳定可靠。     

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