分散染料微胶囊的制备及其结构、性能的关系

采用分散染料、系统调节剂MS、密胺树脂及不同分散剂进行单层造壁，在原位聚合地制备微胶囊过程中，探讨了调节剂MS用量、分散剂品种及用量对微胶囊结构的影响。分析测定了分散染料微胶囊的粒径分布、缓释性能及热能，得到了不同分散染料微胶囊制备工艺和相应样品结构与性能间的关系。     

分散染料微胶囊的制备、性能及应用

采用原位聚合法结合多层造壁技术，对分散染料进行胶囊化，改变聚合过程中系统调节剂的用量或分散剂的种类，将制得的分散染料微胶囊进行多次转移印花，并对分散染料微胶囊的粒径分布，液相扩散性能，热性能及多次转移印花性能进行了研究。     

单凝聚法制备壳聚糖-艾蒿油微胶囊抗菌剂的研究

探讨了以壳聚糖作壁材、艾蒿油作芯材，采用单凝聚法制备绿色环保型微胶囊织物抗菌剂的工艺条件，研究了w（艾蒿油和壳聚糖）、pH、凝聚温度等因素对微胶囊化的影响，用多媒体显微镜观测了微胶囊颗粒的外观形貌、粒径大小及分布，将所制微胶囊用于棉织物整理并检测了效果确定了用单凝聚法制备壳聚糖-艾蒿油微胶囊的最佳工艺：pH为7．0-7，5，w（艾蒿油和壳聚糖）为1．0％～15％（对反应液质量），50℃，30（交联剂）为2％（对壁材质量）；制备的微胶囊基本呈球体，平均粒径为2～4μm，分布较集中；当w（微胶囊）为1．00％（对整理液质量）时，整理试样对金黄色葡萄球菌和大肠杆菌的抑菌率分别为93．07％和84．33％，但白度稍有降低．     

壳聚糖聚氨酯双层壳香味微胶囊的研发

文中以聚氨酯为内层壁材、壳聚糖为外层壁材,采用原位聚合法制备包覆薰衣草精油的壳聚糖聚氨酯双层壳香味微胶囊,探讨了分散剂种类和用量的影响,测试合成的微胶囊粒径、表面形貌、留香效果。结果表明,壳聚糖聚氨酯双层壳香味微胶囊呈规则球形,囊壁致密而完整;用Tween80作为分散剂,可制得平均粒径为0.756μm,分布系数为0.623的壳聚糖聚氨酯双层壳香味微胶囊;与纯精油和聚氨酯单层壳微胶囊相比,壳聚糖聚氨酯双层壳香味微胶囊可获得较好的香味缓释效果。     

壁材比例对复合凝聚法天然VE微胶囊包埋效果的影响

根据壁材特性及凝胶工艺,以明胶和海藻酸钠为壁材,5%氯化钙溶液为固化剂,采用复合凝聚法制备天然V_E微胶囊。研究两种壁材比例对天然V_E微胶囊的微观形貌、粒径分布及其包埋效果的影响。结果表明,当明胶与海藻酸钠质量比为3:1时,制得的微胶囊形状规则,粒径适中且分布在30~60μm,平均粒径35.17μm,产率和效率以及固态时的有效载量均达到最高。     

光敏变色微胶囊的合成及其在纺织品中的应用

合成了一种螺环类光敏变色染料，产采用微胶囊技术将变色染料微囊化，大大提高了其耐疲性、抗氧化性以及对酸、碱、氧等化学环境的稳定性；探讨了芯材／壁材用量比、搅拌速度及成膜剂Ｗ的加料方式和速度对变色微胶囊粒径分布的影响。应用测试证明，所制备的光敏变色微胶囊印花浆具有良好的耐疲劳性、皂洗牢度和日晒牢度。     

分散染料微胶囊缓释扩散性能的研究

通过原位聚合法对分散染料进行胶囊化后,选用乙醇作为萃取剂,对分散染料微胶囊进行萃取,并采用人姚度法测定萃取液的吸光度,从而获得分散料微胶囊的缓释扩散性能。实验结果表明,染料类型,染料含助剂、系统调节剂及壁材用量对最终分散染料微胶囊的缓释扩散性能和都产生影响。     

聚氨酯/檀香精油微胶囊的形态调控与缓释效果优化

以磷酸三钙(TCP)为分散剂,甲苯-2,4-二异氰酸酯(TDI)和聚乙二醇(PEG)为油相和水相反应单体,通过基于高速剪切分散的界面聚合制备包裹檀香精油在聚氨酯壁材内的微米级微胶囊。发现通过调节分散剂TCP质量分数、悬浮化剪切强度、芯材/壁材比等因素,可制得拥有不同粒径和囊壁厚度的精油微胶囊。对不同粒径和囊壁厚度的精油微胶囊进行热重分析,缓释速率测试结果显示,当微胶囊粒径为30μm、壁厚适中时,胶囊的缓释效果最佳。     

织物护肤整理剂角鲨烷微胶囊的研制

以角鲨烷为芯材、聚氨酯为壁材,通过界面聚合方法制备了角鲨烷微胶囊.考察了一些微胶囊制备的影响因素,结果表明:提高乳化速率、增加乳化剂用量、降低相比(有机相/水相)及增大芯壁比等,都会使角鲨烷微胶囊粒径分布变窄、平均粒径变小、壁厚变薄.经正交试验优化出的微胶囊制备工艺条件:乳化速率9 500 r/min、乳化剂PVA 2.0%(对单体质量)、相比10∶90、芯壁比1∶2.在该工艺条件下,可得到粒径分布比较集中、平均粒径7μm左右、壁厚0.3μm左右、角鲨烷包载率为85%以上的微胶囊.     

环氧树脂型相变微胶囊的制备及其在海藻纤维中的应用

用液体石蜡作为芯材料，单体乙二胺（EDA）与环氧氯丙烷采用界面聚合合成了粒径约1．0μm的环氧树脂型相变微胶囊，并将其和海藻酸钠共混制备了相变调温海藻纤维．利用生物显微镜观察了相变微胶囊的形貌和海藻纤维的纵面；利用激光粒度分布测试仪表征了相变微胶囊的粒径及粒径分布；利用差示扫描量热仪（DSC）测试了相变微胶囊和海藻纤维的热性能．     

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