假喜马拉雅块菌化学成分分析及其抗氧化能力研究

通过超高效液相色谱-四极杆-静电场轨道阱高分辨质谱法(ultra-performance liquid chromatography-tan-dem q-exactive quadrupole-electrostatic field track trap high resolution mass spectrometr...     

高效液相色谱-Q-Exactive四极杆/静电场轨道阱高分辨质谱在食品药品安全分析中的应用概述

食品药品基质复杂,食药安全分析需要更加准确可靠和方便快捷的检测方法和技术。Q-Exactive-四极杆/静电场轨道阱高分辨质谱的出现,使得液相色谱-质谱联用技术拥有更高的分辨率和质量精度,分析速度更快,适用于各种基质的食品药品的安全分析。本文介绍了高效液相色谱-Q-Exactive-四极杆/静电场轨道阱高分辨质谱技术的特点,根据样品的基质进行分类,对近年来高效液相色谱-Q-Exactive-四极杆/静电场轨道阱高分辨质谱技术在食品药品安全分析中的应用进行了概述。     

超高效液相色谱-四极杆-静电场轨道离子阱高分辨质谱法检测2种金花茶叶化学成分

目的 采用超高效液相色谱-四极杆-静电场轨道离子阱高分辨质谱法（ultra performance liquid chromatography-quadrupole-orbitrap high resolution mass spectrometry,UPLC-Q-Orbitrap HRMS）建立防城金花茶和越南金花茶叶主要化学成分的分析与鉴定方法。方法 样品采用ACQUITY UPLC? HSS T3色谱柱分离,以0.1%甲酸乙腈-0.1%甲酸水溶液为流动相,流速0.300 mL/min,柱温35℃,梯度洗脱,在正负离子模式下采集数据,根据高分辨质谱提供的精确相对分子质量和碎片离子信息,结合ChemSpider、mzVault、mzCloud质谱数据库和相关文献报道对金花茶叶的化学成分进行分析。结果 从金花茶叶中共确认180个化学成分,包含了28个黄酮类化合物,9个苯丙素类化合物,12个萜类化合物,3个生物碱类化合物和128个其他类成分。结论 应用超高效液相色谱-四极杆-静电场轨道离子阱高分辨质谱法结合数据库可实现对金花茶主要化学成分的分析鉴定,可为进一步研究金花茶的全面质量控制提供了科学依据。     

食品中米酵菌酸测定方法研究进展

近年来因食品被米酵菌酸污染而导致中毒事件时有发生,本文对食品中米酵菌酸的测定方法进行综合性总结。从最初的薄层色谱法和分光光度法,发展到到高效液相色谱法、高效液相色谱串联质谱法,到最新的超高效液相色谱-四极杆/静电场轨道阱高分辨质谱法进行综述,为以后的米酵菌酸测定方法的开发提供参考。     

基于UPLC-Q-Orbitrap HRMS和网络药理学分析五味子治疗非酒精性脂肪肝的物质基础及作用机制

目的:基于超高效液相色谱-四极杆-静电场轨道阱高分辨质谱法(UPLC-Q-Orbitrap HRMS)、网络药理学方法及分子对接技术探索五味子治疗非酒精脂肪肝的物质基础与作用机制.方法:利用UPLC-Q-Orbitrap HRMS技术鉴定五味子中的化学成分.利用中药系统药理学数据库和分析平台(TCMSP)和SwissT...     

食用植物油中乙基麦芽酚测定干扰未知物分析

通过超高效液相色谱-三重四极杆质谱联用仪检测食用植物油样品,在乙基麦芽酚出峰保留时间附近出现易导致其结果误判的未知物,使用超高效液相色谱-四极杆/静电场轨道阱高分辨质谱联用仪对未知物进行鉴定,结果表明该未知物是乙基麦芽酚酮式异构体。该试验首次确证了乙基麦芽酚的烯醇式和酮式异构体,为掺假食用植物油准确鉴定提供技术参考。     

全二维气质技术解析馥郁香型白酒风味与质量品评关系

采用液液萃取的前处理方法结合全二维气相色谱-四极杆质谱技术,建立了白酒挥发性香气成分的分析方法,以Rtx-WAX色谱柱(30 m×0.25 mm×0.25μm)为一维色谱柱、BPX-5(2.5 m×0.1 mm×0.1μm)为二维色谱柱组成柱系统进行分离,调制周期4.2 s,四极杆质谱扫描范围为35～320 u条件下,研究了馥郁香型白酒中的挥发性香气成分在全二维色谱中的分离规律,发现了化合物规律性分布特征。应用该方法在馥郁香型白酒基酒中共定性辨识出308种挥发性香气成分,主要包括酯类物质102种,醇类物质42种,酸类物质33种,醛类物质26种,酮类物质19种,其他物质86种。同时,运用此方法对市场上不同品评等级的馥郁香型白酒成品酒进行分析,对分析结果建立模型,并将色谱分析结果结合主成分分析的方法预测感官评级。结果显示,运用主成分分析法能够观测到市场上不同等级馥郁香型白酒的分类趋势,且结果与感官品评结果一致,该方法能够为工厂在白酒生产过程中等级评定环节提供理论指导。     

超高效液相色谱-四极杆/静电场轨道阱高分辨质谱法测定动源性食品中33种兽药残留及质谱库的建立

目的 建立超高效液相色谱-四极杆/静电场轨道阱高分辨质谱法测定动源性食品中33种兽药残留的检测方法.方法 采用乙腈-水(80:20,V:V)为提取溶剂,QuEChERS方法净化,在Full MS-ddMS2正离子扫描模式下,快速对动源性食品中的目标化合物进行检测.结果 在r=70000,扫描范围80～1000 m/z内...     

超高效液相色谱-四极杆/静电场轨道阱高分辨质谱快速测定乳及乳制品中21种真菌毒素

建立利用超高效液相色谱-四极杆/静电场轨道阱高分辨质谱联用技术同时测定乳及乳制品中21种真菌毒素的方法.乳及乳制品经酸化乙腈提取后,采用Captiva-EMR Lipid净化柱净化,以C18色谱柱进行色谱分离,质谱采用全扫描/数据依赖的二级扫描模式(full scan data-dependent MS/MS acqu...     

基于非靶标代谢组学分析2种花生油中非挥发性成分差异

采用非靶标代谢组学的方法,基于超高效液相色谱-四极杆/静电场轨道阱高分辨质谱联用技术开展2种花生油中非挥发性的差异性物质研究,并应用主成分分析(PCA)和偏最小二乘判别分析(PLS-DA)对其进行有效区分。结果表明,2种花生油共有31种非挥发性差异物质,包括氨基酸类、萜类、维生素类、植物生长相关物质、脂肪酸类、脂肪酸酯类、脂肪酰胺类等成分,并对其中典型物质进行了分析。该方法简单、快速、可靠,可用于花生油中非挥发性成分的差异分析,丰富了花生油的物质信息并为今后食用油的产品分析提供新的途径。     

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