季铵盐Gemini表面活性剂在制革工业中的应用

季铵盐Gemini表面活性剂是一种新型表面活性剂,具有正电荷性、水溶性优良、界面活性高、生物降解性好等优点。可作为杀菌剂、加脂剂、固色剂、抗静电剂应用于皮革制造工业。研究综述了季铵盐Gemini表面活性剂的合成进展和其在制革工业中的应用状况,展望了季铵盐Gemini表面活性剂在皮革化工领域的应用前景。     

磺化二聚顺酐化大豆脂肪酸作为皮革加脂剂的性能

分子结构的改变改善了新一代双子表面活性剂的表面活性。研究结果证实它作为功能性化学品,工业应用可以大大减少用量,具有可观的经济利益。评价了新型合成的基于磺化二聚顺酐化大豆脂肪酸(丁二醇为架桥剂)的双子表面活性剂作为皮革加脂剂的性能。分析测试了加脂剂的化学性能指标,定性和定量研究了加脂效果。SEM研究表明基于双子表面活性剂的加脂剂比传统加脂剂有更好的渗透性。将结果与表面活性剂的乳化能力、zeta电位和粒子尺寸进行了关联,发现它比传统的表面活性剂更好。计算了加脂剂的表面能,发现它们相当。     

Gemini表面活性剂在制革工业中的应用

Gemini表面活性剂是一种新型的表面活性剂,它具有高表面活性、超低界面张力、强协同效应等特性。从Gem-ini表面活性剂的结构、性质、分类及其合成方法等方面进行了介绍,就其在制革工序中的应用进展进行了综述,并对其在制革工业中的应用前景进行了展望。     

表面活性剂在制革工业中的应用

本文概念了表面活性剂在皮革工业中的应用,并指出了皮革工业用表面活性剂的发展方向。     

表面活性剂在制革工业中的应用

本文概述了表面活性剂在皮革工业中的应用,并指出了皮革工业用表面活性剂的发展方向.     

表面活性剂在皮革工业的应用现状与发展趋势(续)

论述了21世纪以来表面活性剂在皮革工业的应用情况,分析了现阶段表面活性剂在皮革工业应用方面所存在的问题,指出了“十一五”期间皮革用表面活性剂的发展趋势。     

表面活性剂在皮革工业的应用现状与发展趋势

论述了21世纪以来表面活性剂在皮革工业的应用情况,分析了现阶段表面活性剂在皮革工业应用方面所存在的问题,指出了“十一五”期间皮革用表面活性剂的发展趋势。     

表面活性剂在皮革生产中的应用

主要叙述了被广泛应用到国民经济的各个领域的表面活性剂在皮革加工生产中的应用,如加脂、涂饰工序,并提出随着对表面活性剂研究的不断深入,将为清洁化皮革生产提供更适宜、高效的化学助剂。     

一种氨基酸型两性表面活性剂在皮革加脂工序中的应用

将一种氨基酸型两性表面活性剂应用于皮革加脂工序,通过考察皮革软度、厚度、加脂剂在皮革中的分布等因素,确定其最佳工艺条件。试验结果表明:在加脂工序中使用氨基酸型两性表面活性剂,与使用市售阴离子表面活性剂、常规加脂相比,可使油脂在革中分布更均匀,提高油脂与胶原的结合率,减少10%左右的加脂剂用量。     

表面活性剂在皮革工业中的应用现状与发展前景

综述了表面活性剂在皮革工业中准备、鞣制到涂饰整理等阶段的应用现状,着重介绍了汽车坐垫革的生产以及皮革工业环境保护对表面活性剂应用性能的要求,展望了皮革用表面活性剂的产品开发及发展趋势.     

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