松香中性施胶剂的甘油改性研究

用丙三醇对松香进行改性,制备酯化松香,用于松香的中性施胶,从中性下的施胶性能出发得到制备的最佳工艺条件为:反应温度195℃,反应物配比r(-OH/-COOH)为0.86,反应时间6h,催化剂为1%对甲苯磺酸,所得的酯化松香,酸值40.36.由其制备的分散松香胶在pH值为7.0时,施胶度为1.00mm.     

再生纸浆用阴离子分散松香施胶剂的制备

对天然松香进行强化和酯化改性,确定了再生纸浆用松香的最佳加成量和酯化度.以常压逆转乳化法制备了阴离子分散松香胶,对乳化剂的选择和配比、用量,转相高速搅拌时间进行了研究,测定了松香胶的乳液性质和施胶效果.     

再生纸浆用阴离子分散松香施胶剂的制备

对天然松香进行强化和酯化改性,确定了再生纸浆用的松香的最佳加成量和酯化度。以常压逆转乳化法制备了阴离子分散松香胶,对乳化剂的选择和配比、用量及转相高速搅拌时间进行了研究,测定了松香胶的乳液性质和施胶效果。     

再生纸浆用阴离子分散松香施胶剂的制备与性能研究

对天然松香进行强化和酯化改性，确定了再生纸浆用的松香的最佳加成量和酯化度。以常压逆转乳化法制备了阴离子分散松香胶，对乳化剂的选择和配比、用量，转相高速搅拌时间进行了研究，测定了松香胶的乳液性质和施胶效果。     

阳离子松香中性施胶剂的应用

以十二叔胺、环氧氯丙烷、松香为原料合成了阳离子改性松香乳化剂乳化松香,并制备出一种阳离子松香中性施胶剂,探讨了其对纸张施胶的影响因素;实验结果表明,该阳离子松香中性施胶剂施胶效率高,在中性条件下具有良好的施胶效果。     

阳离子松香中性施胶剂的制备及应用

采用自制的阳离子乳化剂乳化松香和改性松香制备了一种阳离子松香中性施胶剂,介绍了该施胶剂的制备技术、应用特性,并对纸张施胶度的影响因素进行了探讨。实验结果表明,阳离子松香中性施胶剂质量稳定、施胶效率高、可用于中性条件下施胶,在pH为6.0~8.0的范围内能获得满意的施胶效果。     

自身阳离子型松香乳液施胶剂的应用探讨

本论文利用松香羧基与环氧氯丙烷的酯化反应及中间体与三甲胺季铵化反应制备阳离子松香，通过物理方法进行分散，制得了高分散和稳定的阳离子松香乳液，将上述乳液作为施胶剂进行兵荒马乱少纸，发现其在中性条件下具有良好的施胶效果，尤其适用于草浆。     

阳离子分散松香胶的松香补充剂

介绍了常用的松香施胶补充剂的基本特点、作用.松香补充剂是制备稳定的阳离子分散松香胶和保证其稳定施胶作用的重要辅助材料,常见的松香补充剂包括石蜡、松香酯化物、石油树脂、脂肪酸、合成施胶剂等.     

石油树脂作松香补充剂对松香胶性能及其施胶作用的影响

利用未改性的C5和C9石油树脂直接与普通松香一起熔融制备阳离子分散松香胶.研究了其对胶料性能及松香施胶的影响,并通过XRD和XPS分析了其在松香施胶中的作用机理.结果表明,C5和C9石油树脂可降低阳离子分散松香胶中分子的短程有序性,抑制松香的结晶,并趋于分布在松香胶膜表面,提高阳离子分散松香胶的施胶性能,但需要调整乳化剂.含有20%C5石油树脂、10%C9石油树脂的阳离子分散松香胶在其加入量为0.8%～1.0%和硫酸铝用量为1.5%～2.0%的条件下,可获得好于普通阳离子分散松香胶的施胶效果.     

松香型阳离子乳化剂的制备及其应用实验

目前,阳离子型松香施胶剂的制备方法主要有三种:阳离子乳化剂乳化法、自身阳离子化法和转型法.其中阳离子表面活性剂品种的限制,乳化剂用量较大,松香胶乳液的施胶效果不理想;而自身阳离子化的松香则由于阳离子亲水基的引入,施胶效果也常大打折扣.     

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