稀土纳米TiO2在棉织物上的抗菌性能

对金红石型TiO2、锐钛型纳米TiO2和稀土纳米TiO2复合粉体在棉织物上的抗菌性能进行研究。试验结果表明，锐钛型纳米TiO2的抗菌性能优于金红石型TiO2，其在棉织物上的抑菌率可达80％。掺入稀土离子有利于提高纳米TiO2抗菌性能。相同条件下，稀土纳米TiO2抑菌率可达到100％，洗涤10次后抑菌率仍为100％。     

纳米级TiO2或SiO2的鞣革机理及鞣性的研究

以聚合物或改性油脂作分散载体，可将纳米级粒子前驱体引入蛋白质纤维间隙中，纳米颗粒在蛋白质纤维间隙中分布均匀，其尺寸均在80～90nm之间。无机纳米粒子和蛋白质的有机-无机杂化作用可显著提高成革的湿、热稳定性，引入2％的纳米级TiO2收缩温度从68℃升高至86．9℃，引入3％的纳米级SiO2其收缩温度到达95．4℃。高表面活性TiO2或SiO2和精氨酸、组氨酸、色氨酸侧基的-C=N-基团发生键合反应，并生成了新的化学键Si-C，同时前驱体水解产生的Si-OH和蛋白质分子的侧基CH-OH间也可发生缩合反应，是成革湿热稳定性提高的本质原因。     

低温制备纳米TiO2溶胶整理棉织物对染料的降解

 在室温条件下使钛酸丁酯水解制备纳米TiO2溶胶,然后利用后整理技术将其负载于棉纤维表面得到纳米TiO2整理棉织物。在对纳米TiO2溶胶及其整理棉织物表征的基础上,将纳米TiO2整理棉织物作为光催化剂应用于有机染料罗丹明B的降解反应中,重点考察了水与钛酸丁酯的物质的量比、陈化时间以及纳米TiO2整理棉织物增重率对脱色率的影响,并研究了纳米TiO2整理棉织物的重复利用性和罗丹明B的降解反应动力学。结果表明,在纳米TiO2溶胶的制备中,水与钛酸丁酯物质的量比的增加能形成粒径小而均匀的溶胶。通过浸烘整理工艺能使纳米TiO2溶胶在棉纤维表面形成锐钛型纳米TiO2结晶薄膜。当纳米TiO2整理棉织物作为光催化剂时,罗丹明B的脱色率随增重率的增加而提高,并且水与钛酸丁酯物质的量比的增加和陈化时间的延长都能够明显改善其光催化活性。纳米TiO2整理棉织物作为光催化剂可以重复使用,并且罗丹明B在纳米TiO2整理棉织物存在下的光催化降解反应符合假一级动力学反应模型。     

纳米TiO_2环境净化整理剂的制备及应用性能

采用低温制备技术合成纳米TiO2水溶胶,并采用浸渍工艺使纳米TiO2负载在棉织物表面形成薄膜,然后用于水中染料和空气中甲醛的催化降解反应中。同时,将纳米TiO2水溶胶与有机硅复配制成纳米TiO2环境净化整理剂,探讨了有机硅乳液对纳米TiO2水溶胶净化性能的影响。结果表明,在光辐射的条件下纳米TiO2粒子能够使不同结构染料分子发生氧化降解反应,其对酸性红88的催化降解效果更好,并能用于高浓度染料废水的处理;紫外光辐射下,纳米TiO2对空气中甲醛具有更好的催化降解效果;有机硅乳液对纳米TiO2净化性能的影响很小,但能改善纳米TiO2在纤维表面的固着和织物的手感。     

不同纳米TiO2负载棉织物在染料降解反应中的比较研究

将低温制备的两种纳米TiO2水溶胶和两种商品化纳米TiO2粉体（5 nm和30 nm）通过浸轧工艺负载于棉织物表面形成纳米TiO2负载棉织物。在经过XRD和SEM表征后,四种纳米TiO2负载棉织物被用于纺织染料酸性红88的降解反应中,考察和比较了它们的光催化降解性能。结果表明,四种纳米TiO2都属于锐钛型,但是水溶胶中的纳米TiO2结晶并不完善。两种纳米TiO2水溶胶和5 nm纳米TiO2粉体在纤维表面所形成薄膜具有相似的形貌,但是与30 nm纳米TiO2粉体所形成薄膜形貌明显不同。两种纳米TiO2水溶胶和5 nm纳米TiO2粉体负载棉织物在酸性和中性介质中的催化降解性能高于30 nm纳米TiO2粉体负载棉织物,但是在碱性介质中两种纳米TiO2粉体负载棉织物的催化降解性能却高于两种纳米TiO2水溶胶负载棉织物。在可见光辐射条件下30 nm纳米TiO2粉体负载棉织物 的催化降解性能显著低于其它三种纳米TiO2负载棉织物,而氯化钠或十二烷基苯磺酸钠存在时纳米TiO2粉体负载棉织物却显示出比纳米TiO2水溶胶负载棉织物更好的催化降解性能。     

Ni2+-Co2+共掺杂TiO2光催化降解制浆黑液的研究

通过sol-gel法制备掺杂Ni2 、Co2 和Ni2 -Co2 共掺杂的纳米TiO2,利用X-射线衍射(XRD)、透射电子显微镜(TEM)和紫外-可见光谱(UV-Vis)对样品进行表征.结果表明:400℃时,粒子平均粒径为10nm左右,Ni2 、Co2 离子共掺杂抑制纳米TiO.晶粒的成长,使TiO2的光谱响应范围向可见光拓展.在紫外光照射下,Ni2 、Co2 离子共掺杂的TiO2能有效提高光催化降解制浆蒸煮黑液的效果,反应8h,体系中的CODCr可由反应前的480mg/I降至192mg/l,色度去除率可达到88.7%.     

纳米TiO2掺杂过渡金属在造纸废水处理中的应用

纳米TiO2掺杂过渡金属离子,能有效提高其光催化活性和反应效率,在处理造纸工业废水等方面具有广阔的应用前景.综述了纳米TiO2的光催化氧化降解机理,纳米TiO2掺杂过渡金属离子的制备方法,掺杂不同金属离子对TiO2光催化性能的影响以及在降解造纸工业废水等多种有机废水的应用.     

超声波技术在纳米TiO2制备和光催化中的应用

介绍了超声波的空化效应、机械效应、热效应及化学效应,以及超声波辅助纳米TiO2的制备方法:超声雾化法、超声水解法、超声波溶胶-凝胶法.综述了超声波技术在纳米TiO2粉体制备、分散及光催化降解有机污染物中的应用.实验结果表明:超声波产生的空化效应,不仅可引起局部高温高压等极端环境,而且产生了大量的高活性自由基,可将有机污染物分解掉.超声波产生的机械效应具有分散催化剂、清洗催化剂的表面、强化传质等作用,能够足进光催化反应.但是,超声波辅助纳米TiO2现仅限于实验室研究,尚未实现工业化应用.而且,超声波辅助纳米TiO2的研究尚存在诸多问题,亟待进一步研究.     

Co掺杂TiO2纳米晶光催化降解制浆黑液

用溶胶-凝胶法制备Co掺杂TiO2纳米晶,利用X-射线衍射(XRD)和紫外-可见光谱(UV-Vis)对样品进行表征.结果表明400℃时,粒子平均粒径为10nm左右,适量Co掺杂抑制TiO2晶粒的成长,掺Co使TiO2纳米晶的光谱响应范围向可见光拓展.在紫外光照射下,掺杂Co的TiO2能有效促进光催化降解制浆黑液,显著提高制浆黑液中CODCr的去除效果,反应8h后,CODCr由反应前的480mg/L降至144mg/L,色度去除率可达到86.9%.     

磁控溅射法研制稀土激活TiO2抗菌材料

采用低温射频磁控溅射技术，以TiO2／Nd、Nd／TiO2、TiO2／Nd／TiO2三种方式，在PET非织造布表面沉积TiO2与稀土Nd相对含量不同的纳米结构复合薄膜，以宽化纳米TiO2的吸收光谱，使其在可见光下也能具有较好的抗菌效果。采用振荡烧瓶法对样品进行抗菌性能测试，并选用大肠杆菌为试验菌种，结果表明，以TiO2／Nd／TiO2的沉积方式，在TiO2薄膜中掺杂一定量的稀土元素Nd，可以有效提高纳米结构复合薄膜的抗菌性能。     

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