PVC保鲜膜中增塑剂DOP在水中迁移规律研究

主要研究了不同几种MA条件下3种PVC保鲜膜中增塑剂DOP在蒸馏水中的迁移规律(模拟果蔬MA保鲜的环境),以PE保鲜膜对照。结果表明,3种PVC保鲜膜包装的蒸馏水中增塑剂DOP有不同程度的迁移,而在PE膜包装的水中没有检测到DOP的迁移。PVC保鲜膜DOP的迁移量与温度、时间、保鲜膜DOP的含量、保鲜膜的厚度有一定的相关性。     

贮藏期间保鲜膜中增塑剂DOP对大米的污染规律研究

试验采用市场中常见的PVC大米保鲜袋对大米进行包装,在常温下贮藏,采用固相萃取方法定期检测保鲜膜和大米中的DOP含量的变化。结果发现,随着贮藏时间的延长,不同保鲜膜中DOP迁移量均逐渐升高,0.08mm PVC保鲜膜在贮藏到18个月时,DOP迁移量接近50μg/g;同时大米受DOP污染的程度随着贮藏时间的延长也日趋严重,其中0.08mm PVC保鲜膜中大米在贮藏到18个月时,大米中DOP迁移量接近4.5μg/g。人体若食用这种大米,很可能对人体造成伤害。     

PVC人造革用环氧脂肪酸甲酯增塑剂的应用性能研究

以传统增塑剂DOP作为参照体系,对自主研发的三支替代型增塑剂环氧脂肪酸甲酯的基本性能和在人造革中的应用性能进行了研究,结果表明:环氧脂肪酸酯类增塑剂具有较高的闪点和环氧值,满足人造革制造要求;虽然耐热性、耐迁移性能略低于DOP,但其对PVC的塑化效率与DOP接近,与PVC树脂的相容性优于DOP,塑化温度较低,能耗低,在人造革制造过程中可取代或部分取代DOP。     

温度对食品级PVC中4种增塑剂迁移量的影响

以食品包装材料聚氯乙烯(PVC)为研究对象,研究PVC中邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二异丁酯(DIBP)、邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二(2-乙基)己酯(DEHP)4种增塑剂在30℃～80℃条件下,水、乙酸、乙醇、正己烷4种模拟液中的迁移情况。结果表明,此4种增塑剂都在正己烷的环境下迁移量最大,并且在各种食品模拟液中的迁移量均随温度的升高而增大。     

涂层工艺对PVC膜结构复合材料力学性能的影响

采用涂层法制备高经密机织物增强体PVC膜结构柔性复合材料,以实验为基础分析了涂层前后拉伸性能变化的原因,同时研究了涂层工艺(焙烘温度、涂层厚度、增塑剂份数)对PVC膜材的力学性能的影响。结果表明:涂层厚度对力学性能的影响最明显,增加增塑剂份数可导致膜材的力学性能下降;综合考虑各涂层因素对膜材力学性能的影响,选择焙烘温度160℃、涂层厚度0.685 mm、增塑剂份数50份时,可获得力学性能较佳的膜结构复合材料。     

纳米细菌纤维素纤维/聚氯乙烯复合材料的制备及性能

以硅烷偶联剂γ-氨丙基三乙氧基硅烷(γAPS)改性的细菌纤维素(BC)为增强剂和增塑剂迁移剂,以乙酰柠檬酸三丁酯(ATBC)为环保增塑剂,使用熔融共混法制备了纤维增强的聚氯乙烯(PVC)复合材料。考察了改性纳米纤维素添加量对所制备的BC/PVA复合材料的影响,并对复合材料的结构、微观形貌、力学性能及增塑剂迁移等进行测试。结果表明：含有1%改性细菌纤维素的PVC复合材料性能最好,对比原始PVC,拉伸强度增加了95.39%;常温(25℃)下,在去离子水、乙醇和环己烷中增塑剂迁移分别减少了36.87%、39.43%、27.23%,即使在高温(60℃)环境下仍有良好的抑制效果。制备的高强度、低增塑剂迁移量的PVC复合材料可应用于生物医疗、儿童玩具等领域。     

食品塑料包装材料中增塑剂含量测定与迁移研究

聚氟乙烯(PVC)作为一种原材料在食品包装、弯矩以及医疗用品等行业当中得到较为广泛的应用。塑料薄膜以及容器等制品都是将树脂当成主要原材料,添加一定数量的增塑剂、稳定剂以及防老化剂之后,制作出来的。笔者在以往几年的研究工作过程当中,发现某些PVC食品保鲜膜当中包含对人体有害的增塑剂,增塑剂可以让熔体的粘度降低,玻璃化转化温度降低,并对产品的弹性模量造成一定影响,但是却不会让材料本身的化学特性发生任何形式变化。     

PVC/Elvaloy/NBR三元共混热塑弹性体的研究

Elvaloy是美国杜邦公司开发的一种新型PVC专用高分子增塑剂,是高分子增塑剂的一个重要突破。近年来,Elvaloy用于PVC方面的研究和应用在美国、日本和西欧已很广泛。据报道,Elvaloy与DOP并用于PVC制成的软制品,克服了低分子增塑剂所存在的迁移、渗出和挥发等缺点,使其耐久性、耐寒性、耐油性和耐候性等显著改善。在国内,这方面的工作已开始起步,但总的来看,这方面的研究应用还不广泛。关于PVC/Elvaloy/NBR三元共混方面的研究还未见报道,本文报道了笔者在这方面做的上些工作。     

迎驾之星包装设计荣获2005年中国包装之星奖

咨询点击 1．PVC食品保鲜膜被疑可能致癌 近期．超市常用包装熟食和生鲜食品的PVC（聚氯乙烯）保鲜膜被疑可能致癌。国家塑料制品监督检验中心主任翁云宣称，PVC保鲜膜中的增塑剂对人体会造成致癌作用．特别是会造成内分泌、荷尔蒙的紊乱。可能引起妇女乳癌、新生儿先天缺陷、男性生殖障碍甚至精神疾病等。目前卫生部还没有专门针对PVC保鲜膜制定的国家标准．制定这个标准是今年的任务之一。     

包装与贮藏温度对蚕豆采后品质的影响

为明确适宜于鲜食蚕豆采后贮藏的温度与自发气调包装材料,以无保鲜膜包装的蚕豆为对照,研究了(1.0±0.5)℃下聚乙烯(PE)、聚氯乙烯(PVC)、微孔(W)3种保鲜膜包装和(5±1)℃PE保鲜膜包装对蚕豆硬度、色泽、水分含量等品质指标的影响。结果表明,(1.0±0.5)℃下采用PVC保鲜膜包装的蚕豆品质优于其它处理,蚕豆贮藏28d,仍保持较好品质。     

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.     

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%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press