分散固相萃取-分散液液微萃取-气相色谱-质谱联用法测定中草药类保健食品中29种有机磷农药残留

目的建立测定中草药类保健食品中有机磷农药残留的分散固相萃取-分散液液微萃取-气相色谱-质谱联用法。方法样品经含0.5%甲酸的乙腈超声提取,上清液经含无水硫酸镁、N-丙基乙二胺(PSA)、C18的分散固相萃取管(d-SPE)净化后,采用分散液液微萃取(DLLME)步骤,用氯仿萃取、浓缩目标化合物。结果在最优条件下,线性范围为0.05~1.00μg/ml,线性相关系数在0.999以上,检出限(LOD)为0.3~3.0μg/kg,29种有机磷农药的平均加标回收率在70.3%~107.5%之间,相对标准偏差均10%。结论该方法具有简便快速、准确灵敏、萃取效率高等特点,可用于中草药类保健食品中有机磷农药残留的检测。     

固相萃取－液相色谱－电喷雾串联质谱法测定鲜枣中14种农药残留

选择强疏水性硅胶基质t C18柱为固相萃取净化柱,以电喷雾(ESI)为离子源,正离子多级反应离子监测(MRM)模式,建立了固相萃取-液相色谱-串联质谱法(HPLC-MS/MS)测定鲜枣中14种农药(包括有机磷杀虫剂、杀菌剂,有机杂环类杀虫剂和新型烟碱类杀虫剂)残留的分析方法。研究比较了不同提取溶剂的提取效果和不同固相萃取小柱的净化效果,同时优化了色谱分离条件和质谱条件。14种农药在10~500μg/L(或1~50μg/L)范围内线性相关,相关系数为0.996 3~0.999 9,方法的定量限为0.10~9.50μg/kg。14种农药在鲜枣中3个水平添加质量浓度的的回收率在67.4%~116.8%,RSD为0.8%~14.8%之间。该方法操作简便,灵敏度、准确度和精密度均符合农药多残留检测技术要求,适用于鲜枣中14种农药多残留的检测。     

Dis-SPE-HPLC-DAD检测水果中有机磷和氨基甲酸酯类农药

建立了高效液相色谱-二极管阵列检测水果中涕灭威、西维因、异丙威、仲丁威、马拉硫磷等5种有机磷和氨基甲酸酯农药的方法。前处理方法采用分散固相萃取,样品以乙腈提取,经无水硫酸镁和氯化钠盐析,PSA净化后,进行HPLC-DAD检测。以甲醇/水(体积比70/30)为流动相,流速1 m L/min。DAD检测器的波长设定为210 nm。5种农药在0.04μg/m L~4μg/m L范围内线性相关系数均高于0.99,检出限在0.057μg/m L~0.60μg/m L之间。样品在0.2、0.4、2μg/m L的加标水平时,平均回收率为73.32%~93.12%,RSD为3.46%~9.36%(n=6)。与传统固相萃取方法相比,分散固相萃取具有简便、省时、高精确度和高回收率的优点,可以作为水果中农药残留的日常检测方法。     

分散固相萃取-表面增强拉曼联用法快速检测 蔬菜中10种有机磷农药残留

目的建立分散固相萃取-表面增强拉曼光谱法(dispersive solid phase extraction-surface enhanced raman scattering,d-SPE-SERS)快速检测蔬菜中10种有机磷农药残留的分析方法。方法采用分散固相萃取对豇豆样品进行前处理,结合表面增强拉曼光谱技术进行检测并进行方法学验证。结果 10种有机磷农药在0.2~15μg/m L的质量浓度范围内,与相应的特征峰强度呈良好的线性关系,相关系数在0.9863~0.9995之间,检出限范围为0.2~1μg/m L,平均加标回收率在59.3%~100.1%之间,RSD≤11.2%(n=5)。结论该方法具有操作简单、迅速、准确性高等特点,适用于豆类等蔬菜中多种有机磷农药残留的快速筛查及鉴定。     

LC-MS/MS测定大米中噻虫嗪农药残留

利用LC-MS/MS建立大米中噻虫嗪农药测定的方法。试样中噻虫嗪农药残留在超声波振荡条件下用乙腈提取,经C18和PSA进行分散固相萃取净化,经液相色谱质谱联用仪检测。方法的检出限为0.1μg/kg,回收率为93.5%~101.2%,相对标准偏差为3.12%~5.84%。     

QuEChERS-气相色谱-三重四级杆串联质谱法高通量检测生鲜肉中有机磷农药残留

该研究旨在建立一种快速、有效检测生鲜肉中18种有机磷农药（organophosphorus pesticides, OPPs）残留的QuEChERS-GC-MS/MS检测方法。样品经饱和正己烷的乙腈溶液提取,MgSO₄、CH₃COONa、N-丙基乙二胺（N-propyl ethylenediamine, PSA）、十八烷基键合硅胶(C₁₈)分散固相萃取净化后,采用DB-1701色谱柱进行分离,GC-MS/MS检测。有机磷农药在1～100μg/kg线性关系良好,相关系数（R²）均>0.990 0,检出限为0.02～0.74μg/kg,定量限为0.08～2.48μg/kg,加标回收率为76%～106%,相对标准偏差为0.50%～7.9%。该实验建立的QuEChERS-GC-MS/MS方法可同时检测18种有机磷农药,操作简便、快速、灵敏、准确,能够满足生鲜畜禽肉中有机磷农药残留的高通量快速检测。     

粮谷中农药残留前处理技术的研究进展

样品前处理技术是保证样品检测结果准确性的重要因素。随着农产品检测技术的发展,粮谷中农药残留前处理技术也从传统的前处理技术阶段发展到新型高效的前处理技术阶段。本文通过检索文献,按照时间顺序以及各国的发展历程,对固相萃取、固相微萃取、超临界流体萃取、微波辅助萃取、凝胶渗透色谱、基质固相分散萃取、加速溶剂萃取、免疫亲和色谱和分散固相萃取一系列样品前处理技术在检测粮谷中农药残留分析方法中的应用进行了简单介绍和概述。归纳了测定粮谷中农药残留的常用提取溶剂、净化方法和分析仪器,并对日常检验工作中如何利用每种前处理技术提出了建议和展望。本文可为食品安全检测领域的科技人员进行进一步的研究和应用提供借鉴和参考。     

SPE-GC/MS测定苹果梨中19种有机氯农药残留（英文）

采用固相萃取技术结合气相色谱—质谱(SPE-GC/MS)技术建立了同时检测苹果梨中19种农药残留的分析方法,并对样品预处理过程中萃取剂、萃取剂用量、取样量、固相萃取柱、洗脱剂等条件进行优化,采用选择离子监测(SIM)模式,外标法定量。结果表明,19种农药在线性范围内线性关系良好(R2≥0.996 7);3个添加水平(20,40,200μg/kg)的回收率为86.1%~108.9%,相对标准偏差10%;19种农药检出限为3.0~6.0μg/kg,定量限为10.0~20.0μg/kg;该方法样品前处理简单、准确性好、灵敏度高,适用于苹果梨中19种农药残留的筛选与测定。     

分散固相萃取-气相色谱串联质谱法同时测定食用植物油中的8种农药

食用植物油经乙腈提取后,经改进的分散固相萃取(QuEChERS)净化,采用气相色谱串联质谱(GC-MS/MS),在选择反应监测离子(SRM)模式下,进行质谱定性,外标法定量,建立了食用植物油中8种禁用农药残留的快速定量分析方法。结果表明,8种农药的回归方程相关系数均大于0.99,定量限为10μg/kg,平均回收率为81.3%~100.7%,相对标准偏差小于等于10.2%。     

超声萃取-气流式液相微萃取-气相色谱质谱在线联用快速检测蔬菜中有机磷农药残留(英文)

建立超声萃取—气流式微注射萃取—在线气相色谱质谱联用(GPMSE—GC—MS)快速测定蔬菜中代表性有机磷农药残留的检测方法。样品经乙酸乙酯超声提取,气流微注射萃取仪(GP—MSE)净化、富集,在线以气相色谱质谱的选择监控离子模式进行定性定量测定。考察GP—MSE的气流速率、样品相温度、萃取时间、萃取溶剂等因素对萃取效率的影响,以10μL的正己烷为萃取、富集溶剂,GP—MSE的气体流速2.0min/mL,萃取相温度250℃,萃取时间为3min,在线进样进行GC—MS分析。结果表明,28种农药在各自的线性范围内线性关系良好(相关系数不低于0.99),检出限(以信噪比(S/N)为3计算为0.3~1.2μg/kg,定量限(S/N=10)为3.0~10.0μg/kg。在两种基质(大白菜、芹菜)中3个添加水平下的回收率为80.2%~122.6%,相对标准偏差为1.6%~12.1%。与固相萃取比较。该方法提取效率高,定性定量准确、灵敏,可实现对蔬菜中多农药残留的快速检测,对保障蔬菜安全,促进蔬菜出口具有重要意义。     

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.     

Detection of adulteration of locust bean gum with guar gum by capillary electrophoresis and polarized light microscopy

Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH₃CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH₂PO₄-20.6 mM Na₂B₄O₇ buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.     

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%.