检验室食品样品制备管理

检验室食品样品覆盖面广,种类多样化,食品样品的制备管理成为了实验室管理中不可忽视的重要环节。必须建立和规范检测样品的接收、传递、识别、制备、保存和处理程序,以确保样品的可溯源性和检验质量的准确可靠。     

检验室食品样品制备管理

检验室食品样品覆盖面广,种类多样化,食品样品的制备管理成为了实验室管理中不可忽视的重要环节。必须建立和规范检测样品的接收、传递、识别、制备、保存和处理程序,以确保样品的可溯源性和检验质量的准确可靠。     

食品采样及样品制备的基本要求分析

<正>当今社会,食品安全问题不断增加,所以人们对食品安全问题更加关注。食品检验能通过科学手段,确定食品中的有毒有害成分,以免给人们的生活带来威胁。确保食品安全是食品检验工作者的职责,本文对食品采样工作的方法及制备做出分析,确保抽取的食品采样样品具有代表性,同时也能更好的完成检验任务。在食品检验过程中,采样是对食品进行检验的第一步,就是从要检验     

食品微生物检验中培养基的质量控制

当前,随着人们生活水平的不断提高,对健康的重视程度也越来越高,食品安全问题成为了万众瞩目的焦点。作为衡量食品卫生质量的重要指标,食品微生物的检验对确保食品安全具有重要的作用。在食品微生物检验中,培养基的质量对微生物检测结果准确性的影响非常大。因此,要严把好培养基质量关,在制备及使用过程中做好质量控制。本文就如何做好检测试剂培养基的质量控制进行了研究与探讨,以期能够为食品微生物检验工作的有效开展提供一些参考。     

食品微生物检验质量控制综述

正在我国社会经济飞速发展的今天,人们的食品安全意识也逐渐加强。食品微生物检验是控制食品质量安全的重要技术手段之一,对减少食品微生物污染具有很重要的意义。因此,需要在检验过程中建立相关的体系文件来确保微生物检验结果的准确性和可靠性。建立健全质量控制系统可有效的提高食品微生物检验质量水平,以准确无误地反映食品卫生情况。食品微生物检验的质量控制包括检验的全过程,从标本的采集、保存、运送,     

食品检验检测过程中的样品管理

随着人们生活水平的不断提高,对食品的要求也越来越严格,所以需要对食品进行检验检测。样品是影响检验检测结果的重要因素,所以在食品检验检测过程中,应加强对样品的管理,确保食品检验结果的准确。本文分析了食品检验检测中样品管理的要点、食品检验检测中样品管理所存在的问题,最后提出相应的样品管理对策。     

浅析食品微生物检验样品的采集和制备

食品安全问题关乎国计民生,其中食品检验是提高食品质量、防止食品被微生物污染,从而保障食品安全的关键环节,因此在食品微生物检验样品的采集、制备、检验等环节中不容有一丝失误,否则会影响检验结果。本文结合工作经验,对食品微生物检验样品的采集、制备工作要点进行分析,以期为相关从业者提供借鉴,共同保障检测质量。     

食品理化检验分析中的质量控制分析

<正>食品种类繁多,形态各异,成分复杂,来源不一,进行理化检验的目的、项目和要求方面也不尽相同。不论什么食品,只要进行理化检验,都必须按照样品的采集、样品的制备和预处理、检验测定、分析数据处理、检验报告等基本程序进行。检验的质量控制是质量管理实验室技术和数据统计分析的综合过程。通过质量控制分析检验过程的质量,使得整体分析数据在一定的置信水平下,达到     

食品检验检测中样品管理和控制的问题与对策

在食品检验过程中,样品管理起着至关重要的作用。只有通过规范化、科学化的样品管理,才能有效提高食品安全检验检测的质量和效率。本论文旨在分析食品检验检测中样品的管理和控制,系统探讨样品管理的原则和要求,并提出了针对常见问题的解决方法。同时,对样品采集、标识和保存等操作环节进行详细阐述,以期为从事食品检验检测的相关人员提供一定的指导和参考。     

食品检验机构样品管理及制备的过程控制探究

食品检验机构通过不断提高食品质量检测的科学性、准确性和公正性,为食品安全提供技术支持。样品管理是食品检验机构质量管理中至关重要的环节,是提高食品检测工作质量的基础。流程管理是检验机构样品管理中的一个重要方法。本文就食品样品接收、样品标识、样品制备、样品流转、样品保存和处置各环节进行分析,优化管理流程,制定改善样品管理工作流程的方法,实现样品在实验室中安全、有序、准确、高效地流转。     

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