液相色谱-串联质谱法测定河豚鱼和鳗鱼中9种青霉素类抗生素

目的建立高压液相色谱-电喷雾串联质谱(HPLC-MS-MS)同时测定河豚鱼和鳗鱼中9种青霉素残留量的检测方法。方法样品经乙腈-氨水溶液提取后,用C18色谱柱分离,乙腈-乙酸为流动相梯度洗脱,最后采用液相色谱-电喷雾串联质谱在正离子多反应监测模式下测定。结果在1.0～20μg/kg(LOQ～10LOQ)范围时,方法线性关系良好,相关系数大于0.999。在LOQ、2LOQ、4LOQ、10LOQ四个添加水平下青霉素的回收率在81.4%～109.7%之间,相对标准偏差在2.81%～7.12%之间,方法检出限是:萘夫西林、青霉素G、哌拉西林、青霉素V、苯唑西林为1.0μg/kg;阿莫西林、氨苄西林、氯唑西林、双氯西林为2.0μg/kg。结论此方法灵敏度高,准确性好,适用于水产品中青霉素的定量检测。     

高效液相色谱-串联质谱法测定牛奶和奶粉中9种青霉素类药物残留量

建立一种检测牛奶和奶粉中9种青霉素类药物残留量的高效液相色谱-串联质谱方法。样品经乙腈-水提取,经HLB固相萃取柱净化,用高效液相色谱串联质谱检测,外标法定量。本方法的检出限,牛奶中氨苄西林、奈夫西林为1μg/kg,阿莫西林、哌拉西林、青霉素G、青霉素V、氯唑西林为2μg/kg,苯唑西林、双氯西林为4μg/kg;奶粉中氨苄西林、奈夫西林为8μg/kg,阿莫西林、哌拉西林、青霉素G、青霉素V、氯唑西林为16μg/kg,苯唑西林、双氯西林为32μg/kg。9种青霉素在1.0～50ng/mL范围呈良好线性,线性相关系数大于0.9888。牛奶的平均回收率为77.58%～97.77%,测定结果的相对标准偏差为4.24%～16.59%(n=10);奶粉的平均回收率在85.95%～96.78%之间,相对标准偏差为2.71%～13.41%(n=10)。该方法具有简便、快速、准确度高、检出限低的优点,适用于牛奶和奶粉中青霉素类抗生素的测定。     

固相萃取-高效液相色谱-串联质谱法测定牛乳和猪肉中5 种青霉素类抗生素

建立一种用固相萃取-高效液相色谱-串联质谱法检测牛乳和猪肉中苄星青霉素G、氨苄西林、苯唑西林、氯唑西林、双氯西林5 种青霉素类抗生素方法。样品经乙腈提取,Bond Elut C18固相萃取柱净化,用高效液相色谱-串联质谱检测,外标法定量。结果表明,本方法5 种青霉素在2.0～200 μg/L范围内呈良好线性关系,线性相关系数大于0.999;牛乳样品添加回收实验,回收率为85.2%～122.7%,相对标准偏差为3.43%～16.8%（n=6）;猪肉样品添加回收实验在50 μg/kg和100 μg/kg添加水平,除氨苄西林外,回收率在94.3%～116.4%,相对标准偏差为1.62%～5.09%（n=6）。方法定量限为1.0～2.0 μg/kg。该方法具有简便快捷、准确度高、定量限低的优点,适用于牛乳和猪肉中青霉素类抗生素的测定。     

液相色谱-串联质谱法测定禽蛋中β-内酰胺类药物残留

目的 建立了禽蛋中普鲁卡因青霉素、青霉素V、青霉素G、氨苄西林、氯唑西林、阿莫西林、头孢氨苄、头孢噻呋、头孢喹肟药物残留检测的液相色谱-串联质谱方法。方法 禽蛋用80%乙腈水溶液提取,PRiME HLB固相萃取小柱净化,用液相色谱-串联质谱测定,青霉素G-D7内标法定量。结果 在0.5-20μg/L的基质匹配标准溶液内9种β－内酰胺类药物均呈良好线性关系,相关系数均大于0.994。样品中9种β－内酰类药物的定量限为1μg/kg,在1μg/kg～10μg/kg的添加浓度范围内平均回收率为73%～96%,相对标准偏差(RSD)小于10%。本方法方便快捷准确,适于禽蛋中的9种β－内酰胺类药物残留检测。     

同位素内标液相色谱-串联质谱法测定婴儿配方奶粉中雌二醇残留

建立了一种婴儿配方奶粉中雌二醇残留的高效液相色谱-电喷雾串联质谱测定方法。样品经乙腈提取、浓缩、正己烷净化,用高效液相色谱分离后,采用电喷雾串联质谱进行定性和定量检测。线性范围为5~100 ng/mL,线性相关系数r大于0.99,方法的定量检出限为1.0μg/kg(S/N=10),高、中、低3个水平的加标回收率为81.5%~112.4%。     

高效液相色谱-串联质谱法测定草莓中5种 植物生长调节剂

目的 建立高效液相色谱-串联质谱法(HPLC-MS/MS)检测草莓中3-吲哚丁酸、赛苯隆、氯吡脲、3-吲哚乙酸、脱落酸5 种植物生长调节剂的方法。方法 样品采用QuEChERS方法乙腈提取, PSA吸附剂净化, 高效液相色谱-串联质谱电喷雾(ESI), 多反应监测(MRM)负离子模式分析检测, 外标法定量。结果 各化合物在0.01~1.0 mg/L范围内均呈现良好的线性关系, 相关系数均大于0.998。5种化合物的检出限在1~5 μg/kg。添加回收率为72.0%~99.4%。相对标准偏差(RSD)均小于10%。结论 通过线性、准确度、精密度实验及样品测定, 验证了以水溶解样品、乙腈提取、QuEChERS净化的方法简便可行。     

液相色谱-串联质谱法检测水果中甲维盐

目的 建立了液相色谱串联质谱检测水果中甲维盐残留的方法, 并对提取溶剂、净化条件、流动相进行了优化。方法 试样经乙腈提取, C18固相萃取小柱净化后, 用液相色谱串联质谱测定。结果 甲维盐在1.0~20 μg/L范围内线性关系良好, 相关系数大于0.99, 在基质样品中添加0.1、0.2、1.0 μg/kg 3个水平药物, 其回收率在69.0%~84.0%之间, 相对标准偏差4.64%~6.98%, 方法检测限为0.05 μg /kg。结论 该方法可靠、稳定, 可满足水果中甲维盐残留检测与确证需要。     

超高效液相色谱-四极杆串联线性离子阱质谱法测定乳制品中8种青霉素类药物及其主要代谢产物

目的建立一种超高效液相色谱-四极杆串联线性离子阱质谱技术测定乳制品中8种青霉素类抗生素(青霉素G、氨苄西林、青霉素V、阿莫西林、苯唑西林、萘夫西林、氯唑西林、双氯西林)及其相应的代谢产物青霉噻唑酸(青霉素G噻唑酸、氨苄青霉噻唑酸、青霉素V噻唑酸、羟氨苄青霉噻唑酸、苯唑青霉噻唑酸、乙氧萘青霉噻唑酸、氯唑青霉噻唑酸、双氯青霉噻唑酸)残留的方法,并对市售乳制品中青霉素及青霉噻唑酸残留情况进行调查。方法乳制品样品中青霉素及青霉噻唑酸采用纯水超声提取,经乙腈沉淀蛋白,正己烷液液萃取除去脂肪,用氮气吹至近干,用乙腈-水(10∶90,V/V)复溶后,经0.22μm微孔滤膜过滤,经超高效液相色谱C_(18)柱(50 mm×2.1 mm,1.8μm)分离,选用乙腈-水(含0.1%甲酸)为流动相,梯度洗脱分离8种青霉素及相应青霉噻唑酸共16种组分;在优化的四极杆串联线性离子阱质谱条件下,采用ESI源、正离子模式、多反应监测方式,外标法定量,采用信息依赖采集扫描功能(IDA)结合增强子离子扫描(EPI)模式对检出阳性结果进行定性分析。结果方法的线性范围为1.0~200μg/L,8种青霉素及相应青霉噻唑酸在各种乳制品基质中均有良好的线性相关性,相关系数r在0.999 1~0.999 9之间,方法最低检测限为0.01~0.05μg/kg(固体乳粉)和0.002~0.010μg/kg(液体奶);方法回收率在80.0%~110.0%,相对标准差为0.16%~7.06%。结论该方法测定8种青霉素药物及相应代谢产物青霉噻唑酸的残留量简便、快速、定性准确,可以满足对青霉素类药物及其代谢产物残留的检测要求。     

超高效液相色谱-串联质谱法测定食用植物油中的游离棉酚

目的建立超高效液相色谱-电喷雾串联质谱测定食用植物油中游离棉酚的方法。方法样品采用无水乙醇溶液提取,C18色谱柱分离,电喷雾串联四极杆质谱仪进行检测。结果棉酚的质量浓度在0.001~1.0μg/mL范围内具有良好的线性关系。食用植物油中的棉酚在5、50、250μg/kg 3个添加水平下,平均回收率为70.6%~94.4%,相对标准偏差小于12.0%;方法检出限LOD(S/N≥3)为1μg/kg,定量限LOQ(S/N≥10)为5μg/kg。结论该方法快速简单,结果准确,重现性好,适用于食用植物油中的游离棉酚含量的测定。     

液相色谱-串联质谱法检测奶制品中9种 β-受体阻断剂药物残留量

目的 建立同时检测奶制品(牛奶、奶粉、奶酪)中9 种β-受体阻断剂(β-blockers, BBS)残留的液相色谱-串联质谱方法。方法 混合均匀的试样经β-葡糖醛苷酶/芳基硫酸酯酶水解, 乙腈提取, 硅藻土与BondElut分散固相萃取填料双重快速净化后, 利用液相色谱-串联质谱法进行定性定量分析。结果 9 种BBs在0.1~20.0 μg/L线性范围内线性关系良好(r≥0.995); 定量限(limit of quantity, LOQ, S/N≥10), 均达到0.5 μg/kg; 3 个添加水平(0.5、1.0和5.0 μg/kg)下的回收率为89.5%~112.5%; 相对标准偏差(relative standard deviation, RSD)为4.2%~11.5%。结论 该方法快速、准确、灵敏, 可用于奶制品样品中多种BBs残留的同时有效测定。     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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