挥发性铵盐盐析辅助液液萃取结合超高效液相色谱-串联质谱法测定酱油中4种黄曲霉毒素

摘要：目的 建立基于挥发性铵盐盐析辅助液液萃取结合超高效液相色谱-串联质谱技术检测酱油中黄曲霉毒素B1、B2、G1、G2 4种黄曲霉毒素含量的分析方法。方法酱油样品用乙腈提取，乙酸铵作为盐析助剂分层，提取液加水定容后，采用C18反相色谱柱以5mmol/L乙酸铵溶液-甲醇/乙腈为流动相进行梯度洗脱，采用电喷雾正离子模式检测，外标法定量。实验考察了萃取溶剂、盐析助剂及pH对萃取效率的影响。结果 最优实验条件下，在0.2~8.0 μg/kg范围内4种黄曲霉毒素线性良好，决定系数均大于0.999，检出限为0.01~0.04 μg/kg，对空白酱油样品进行0.8 μg/kg、4.0 μg/kg、8.0 μg/kg三个水平的加标实验，回收率为73.2~94.5%，相对标准偏差为0.9~5.9%。结论 新建立的方法操作简捷、成本低、准确度高，可以满足对酱油中4种黄曲霉毒素的快速准确分析要求。     

超声辅助-分散液液微萃取/快速液相色谱-串联质谱法测定食用植物油中黄曲霉毒素

建立了超声辅助-分散液液微萃取(UA-DLLME)/快速液相色谱-串联质谱法(RRLC-MS/MS)测定食用植物油中黄曲霉毒素(AFB_1、AFB_2、AFG_1、AFG_2)的方法。先以分散剂溶解样品,再以萃取剂萃取,离心后底层溶液经脱脂上机,在电喷雾离子源正离子模式(ESI~+)下采用多反应监测模式(MRM)监测。对样品前处理方法进行了优化。结果表明,最优样品前处理条件为:1 g样品,2 mL石油醚为分散剂,1 000μL乙腈-水(体积比8∶2)为萃取剂,超声辅助萃取时间2 min,离心时间5 min,离心转速4 000 r/min。该方法的线性范围为0.625～30.0 ng/mL,相关系数均大于0.998,加标回收率为88.2%～101.5%,相对标准偏差均小于3.3%。该方法简便、快速、经济、准确度和精密度高且环境友好,适合食用植物油中黄曲霉毒素的定性和定量测定。     

液液萃取-HPLC法测定食品中黄曲霉毒素B_1

建立一种液液萃取净化,结合柱后碘衍生-高效液相色谱检测食品中黄曲霉毒素B1的新方法。食品中黄曲霉毒素B1采用乙腈-水(85︰15, V/V)混合溶液提取,加入蛋白沉淀剂和正己烷除去蛋白质及脂溶性杂质,经三氯甲烷萃取净化、浓缩及定容后用柱后碘衍生-高效液相色谱荧光检测器进行检测。结果表明,在0.1～50.0 ng/mL浓度范围内,线性关系良好,拟合系数为0.999 97,在3倍信噪比下计算方法检出限为0.02μg/kg;分别对多种样品进行低(0.4μg/kg)、中(4.0μg/kg)、高(40μg/kg)加标回收率试验,回收率范围为75.9%～94.7%,相对标准偏差(RSD, n=6)为0.1%～5.4%。该方法分析速度快,准确度高,重复性好,适用于食品中黄曲霉毒素B1的检测。     

市售调味酱中5种真菌毒素的测定

建立了用超高效液相色谱-串联质谱同时检测芝麻酱、花生酱及黄豆酱中5种真菌毒素(黄曲霉毒素B1、黄曲霉毒素B2、黄曲霉毒素G1、黄曲霉毒素G2、赭曲霉毒素A)的检测方法.样品采取乙腈-甲酸-水(70∶1∶29,体积比)混合溶液提取,利用多功能净化柱净化,采用1％的甲酸水相和混合甲醇-乙腈有机相进行梯度洗脱,经多反应监测模...     

液-质串联法测定深海鱼油胶丸中的黄曲霉毒素B_1

目的:尝试利用液相色谱-串联质谱法对深海鱼油胶丸中黄曲霉毒素B1含量进行测定。方法:以甲醇-0.1%甲酸水溶液为溶剂提取胶丸中鱼油所含黄曲霉毒素B1,离心后取上清液过中性氧化铝固相萃取小柱净化,浓缩后进样测定,以甲醇-0.1%甲酸流动相梯度洗脱,流速为0.3 m L/min,柱温30℃,进样量25μL。采用电喷雾离子化四极杆串联质谱,多反应监测方式测定样品的浓度。结果:黄曲霉毒素B1在0.098~1.96 ng/m L范围内线性关系良好,r=0.9992,检出限为0.05ng/m L,平均加样回收率为97.73%,RSD=4.625%(n=6)。结论:此法灵敏准确,专属性强,干扰少,重现性佳,对含油保健食品中黄曲霉毒素B1含量检测有参考意义。     

液相色谱-串联质谱法检测婴幼儿食品中 6种黄曲霉毒素

目的建立了液相色谱-串联质谱测定婴幼儿食品中6种黄曲霉毒素的方法。方法试样经乙腈超声提取,离心,MycosepTM226净化柱净化后液相色谱串联质谱仪直接测定,外标法定量。结果加标回收率范围为83.3%~100.6%,相对标准偏差(RSDs)在1.30%~6.64%。将本方法用于实际样品分析,60份婴幼儿食品中黄曲霉毒素B1检出2份,黄曲霉毒素G2检出1份,其余4种黄曲霉毒素均未检出。结论此方法简便快速,可用于婴幼儿食品中6种黄曲霉毒素的测定。     

超高效液相色谱-串联质谱法测定牛奶中24 种真菌毒素

运用基质分散固相萃取净化,建立牛奶中24 种真菌毒素（黄曲霉毒素B1、黄曲霉毒素B2、黄曲霉毒素G1、黄曲霉毒素G2、黄曲霉毒素M1、赭曲霉毒素A、玉米赤霉烯酮、玉米赤霉酮、α-玉米赤霉烯醇、β-玉米赤霉烯醇、α-玉米赤霉醇、β-玉米赤霉醇、T-2毒素、HT-2霉素、伏马毒素B1、伏马毒素B2、伏马毒素B3、脱氧雪腐镰刀菌烯醇、3-乙酰脱氧雪腐镰刀菌烯醇、15-乙酰脱氧雪腐镰刀菌烯醇、交链孢霉单甲基醚、交链孢酚、腾毒素、细交链孢菌酮酸）多残留检测的超高效液相色谱-串联质谱检测方法。样品经80%乙腈溶液（体积分数）提取,通过基质分散固相萃取净化,氮吹至近干,1 mL 50%乙腈溶液（体积分数）复溶,采用超高效液相色谱-串联质谱进行测定。经ACQUITY UPLC HSS T3反相柱（2.1 mm×100 mm,1.8 μm）分离,梯度洗脱,采用电喷雾离子源-多反应监测模式采集。24 种目标物的相关系数（R2）均大于0.985,加标回收率为71.0%～123.0%,相对标准偏差均小于10%。该方法具有操作简单、重复性好、灵敏度高、杂质干扰小等特点,可以用于牛奶中24 种真菌毒素的检测。     

食品中黄曲霉毒素B_1的液相色谱-串联质谱测定法

建立了食品中黄曲霉毒素B1残留量的超高效液相色谱-串联质谱的检测方法。样品经乙腈+水(84+16)提取后,经多功能净化柱净化,超高效液相色谱-串联质谱法检测。本方法定量限为1μg/kg,线性范围为1~20 ng/mL;在黄曲霉毒素B1添加水平为1~10μg/kg时,在玉米样品中的回收率为95%~105%;在酱油样品中的回收率为96%~106%。     

离子液萃取-高效液相色谱法检测调味品中的罗丹明B

为研究溶液pH、溶液体积、吸附时间等对离子液吸附罗丹明B的影响,本文采用离子子液萃取-高效液相色谱检测方法,合成离子液体后对罗丹明B吸附性能进行研究。结果表明,该检测方法操作简单、回收率高、灵敏度高,可对待测样品进行批量检测。     

现行黄曲霉毒素液相色谱检测法的比较与评价

目的 综合评价检测黄曲霉毒素的几种现行液相色谱-荧光法。方法 采用均质(涡旋)、超声辅助液液萃取技术对样品中的黄曲霉毒素进行提取, 免疫亲和柱和多功能柱净化。并采用不同的检测技术[三氟乙酸(TFA)柱前衍生法、光化学柱后衍生法、碘和溴柱后衍生法、大体积流动池直接检测及光化学柱后衍生串联大体积流动池]对玉米质控样品中黄曲霉毒素进行了分析。结果 各方法的检测结果均较理想, 可满足常规样品的检测要求。结论 超高压液相色谱-大体积流动池检测法在有效提高工作效率的同时, 大量减少了有毒有害试剂的使用量, 且具有最高的检测灵敏度, 可满足GB 2761-2011中对各类样品中黄曲霉毒素的限量要求。采用乙腈-水或甲醇-水体系均能达到较好提取黄曲霉毒素的目的。免疫亲和柱的净化效果较多功能柱好。     

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