餐桌用纸的产品质量问题探讨

分析了造纸产品标准体系对餐桌用纸产品质量的规定及缺失,重点研究其荧光增白剂、重金属、耐摩擦色牢度的产品质量问题。结果表明:托盘纸、餐台垫纸、筷子套、花底纸等间接接触食品的餐桌用纸存在含有荧光增白剂甚至可迁移性荧光增白剂的风险。欧洲标准EN648:2006规定了食品包装纸和纸板中荧光增白剂的迁移性检测方法,与国标方法一致性较好。用水、乙酸、乙醇为介质的湿摩擦接触转移的方式更能模拟餐桌用纸的实际使用状态,适合于餐桌用纸耐摩擦色牢度的测试。     

餐桌用纸荧光增白剂的分析方法

分析了造纸产品标准体系中对餐桌用纸荧光增白剂的规定及缺失。通过对收集的23种托盘纸、餐台垫纸、筷子套纸、花纹底纸等餐桌用纸的测定,比较了可迁移性荧光增白剂的不同测定方法。结果表明,托盘纸、餐台垫纸、筷子套纸、花纹底纸等间接接触食品的餐桌用纸绝大多数含有荧光增白剂,且含有可迁移性荧光增白剂。可迁移性荧光增白剂的紫外可见分光光度法与定性测试法的结果一致性较好。与国家标准中模拟汗液的转移介质相比,用水、乙酸、乙醇为介质的湿摩擦接触转移的方式更能模拟餐桌用纸的实际使用状态,适合于餐桌用纸可迁移性荧光增白剂的测试。     

纺织品领域中常用荧光增白剂的种类与检测

通过对纺织品中荧光增白剂使用情况的阐述,结合标准FZ/T 01137—2016《纺织品荧光增白剂的测定》,分析介绍纺织品中常用荧光增白剂的种类,并对纺织品领域中荧光增白剂的检测方法进行分析比较;重点介绍了针对纺织品中常用的9种荧光增白剂开展的高效液相色谱法检测,并给出相应的液相图谱和标准工作曲线。     

增白物质对人体的危害

随着化学工业的迅猛发展,精细化工产品的应用范围不断扩展,一些增白物质在轻化产品中颇为多见,无论从化学物质物化特性分析还是临床医学实践均证明,对人体健康危害是不可轻视的。 一、纸张中的荧光增白剂 在文化印刷用纸、工业技术用纸、生活系列用纸、包装装璜用纸等纸中其品种数以千计,常见的面巾纸、餐巾纸、卷烟纸、食品包装纸、现代办公用纸等,产品标准所订白度指标很高,而国内制浆化学漂白工艺是难以达到要求,生产厂家只得借加入荧光增白剂进一步提高纸浆白度,这一手段已沿用很久了。荧光增白系物理增白方法,早在1940年德国化学家蒙索特合成了荧光增白物质,并用于     

荧光量子产率在荧光增白剂配伍和品质控制中的应用

荧光量子产率是荧光增白剂的一个重要性能指标,是由荧光增白剂水溶液的紫外吸收和荧光光谱决定的。采用已知荧光量子产率的硫酸奎宁为标准物质,建立了一种检测荧光增白剂荧光量子产率的方法,并应用该方法检测了不同品种、不同品质、不同配伍组成的荧光增白剂的相对荧光量子产率,并对方法的准确性进行了验证。结果表明:目前国内水溶性荧光增白剂中C.I.351的荧光量子产率最高,接近1,高于DSD酸双三嗪类荧光增白剂,而DSD酸双三嗪类荧光增白剂又以C.I.71的荧光量子产率最高;荧光增白剂的增白强度、外观色光、应用色光等品质都与荧光增白剂的荧光量子产率有关,荧光量子产率越高,各项性能越优;荧光量子产率还可用以评价配伍产品的加合增效作用,而不必借助繁琐的应用试验;该方法相对标准偏差小于5%,方法重现性好。     

颜料和染料在高级文化用纸中的调色研究

在高级文化用纸的生产中,纸张的色相是成品纸的一项重要品质.本实验分别使用直接染料/荧光增白剂、颜料/荧光增白剂组合对白纸进行调色.实验证明,在白纸调色过程中两种组合均可达到效果.在高白度（CIE=155）的文化用纸生产中,直接染料/荧光增白剂组合的用量为直接紫0.12kg/t,直接蓝0.08kg/t,荧光增白剂11kg/t;颜料/荧光增白剂组合的用量为颜料紫0.2kg/t,颜料蓝0.03kg/t,荧光增白剂7.5kg/t.实验发现使用颜料/荧光增白剂组合可以使纸张达到更明亮的色相,并可以显著降低荧光增白剂用量,从而降低生产成本.     

浅谈食品包装用纸中有毒有害物质的来源及其危害

对我国食品包装用纸中主要的有毒有害物质如:荧光增白剂、重金属及其化合物、多氯联苯及微量的二恶英等的来源及危害进行了分析,提出了应加强对食品包装用纸中有毒有害物质的监督、检测和控制的建议.     

洗涤产品中荧光增白剂

正本文介绍了荧光增白剂在洗涤行业中的作用和国内外洗涤产品中荧光增白剂执行的相关标准。着重分析目前国内外对于荧光增白剂检测的手段和方法,强调荧光增白剂的定量检测能切实掌握有害物质的来源和预防措施,对提高安徽省洗涤用品质量安全,保障人民生活健康安全具有重要意义。荧光增白剂的应用荧光增白剂是一种无色的荧光染     

荧光分光光度法测定学生作业用纸中荧光增白剂的含量

以荧光增白剂VBL为标准物质建立了荧光分光光度法测定学生作业用纸中荧光增白剂含量的方法.该方法的荧光激发波长为350 nm、发射波长为430 nm,VBL浓度在O～1.0 μg/mL范围内与荧光强度呈线性关系,线性方程为F=448.96x+8.4649,相关系数R2=0.9986.分别探究了萃取温度、乙醇浓度及其用量、...     

食品塑料接触材料中荧光增白剂检测方法研究进展

荧光增白剂是一类能使物质增白的有机化合物。近年来,不少商家会向塑料食品接触材料中添加荧光增白剂来提高食品包装的色泽,使用这类食品时,荧光增白剂容易迁移到人体内,而且很难通过正常代谢排出体外,若长期使用,对人体的健康造成极大威胁。国内外的标准和法律法规中对塑料食品接触材料中荧光增白剂含量均有明确限制,但并无配套的检测方法。因此,建立塑料食品接触材料中荧光增白剂的有效检测方式是当前迫切需要解决的问题。着重介绍荧光增白剂的种类以及国内外检测荧光增白剂的研究进展,为荧光增白剂提取溶剂和检测方法的选择提供一定参考依据。     

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