高白度麦草浆OP两段漂白的研究

本文研究了ＳＳＡＱ麦草浆ＯＰ两段漂白的工艺。结果指出，适当酸处理后，氧漂过程中中添加氨磺酸（ＳＦＡ），适当提高氧漂压力（１．０ＭＰａ），延长漂白时间（７０分钟），可使未漂浆硬度（ＫＭｎＯ４值）降低率达５０％左右；白度从５１．７５％升高至７０．９％（ＳＢＤ）；粘度降低率为１６．６％，氧漂浆粘度为１０２０ｃｍ／ｇ。系统的Ｈ２Ｏ２漂白表明，氧漂浆在Ｈ２Ｏ２漂前采用Ｈ２ＳＯ４预处理具有很好的效果，Ｈ２Ｏ２     

麦草浆甲醇强化氧气漂白的研究

进行ＡＳ－ＡＱ麦草浆甲醇强化的氧气漂白研究，结果表明：漂前的硫酸预处理是提高氧漂浆质量的重要措施；在实验条件下，甲醇用量和氧气初压是决定漂浆白度的最主要因素；温度对漂浆得率的影响较大；温度太高，将对漂浆白度不利；漂白时间对漂浆白度、得率的作用较小。在选定的６％甲醇、９０℃、８０分钟、０．７ＭＰａ氧气初压的条件下，氧漂浆白度为７３．４％ＳＢＤ；再经１．５％Ｈ２Ｏ２漂白，浆白度达８２％ＳＢＤ，裂断长为     

马尾松硫酸盐浆高白度TCF漂白新工艺

本试验着重对马尾松硫酸盐浆氧脱木素的活化预处理，两段氧脱木素工艺，过氧化氢漂前活化处理等进行了大量的研究。在此基础上提出了采用（ｘＯ１）ｐ）Ｏ２ｙＰ漂序作为马尾松硫酸盐浆漂白流程，该注程可将其漂至８７．５％（ＳＢＤ）的高白度，而且整个过程不含氯元素，不采用投资较大的臭氧漂白，可操作性强，是一种值得推荐的硫酸盐浆ＴＣＦ漂白新工艺。     

红麻皮硫酸盐浆的高白度无氯漂白

对红麻皮ＫＰ浆常规多段漂白及无氯多段漂白工艺与机理进行了对比研究。采用ＣＥＨＰ漂白，总用氯量４．９％，Ｈ２Ｏ２用量０．５％，可漂至８７．１％白度。采用ＺＥｐＺＰ无氯漂白，Ｚ漂白浓度在５０％为最佳，Ｏ３总用量１．７％，Ｈ２Ｏ２总用量１．５％，可漂至８７．２％白度，虽然纸浆粘度比前者低１２．６％，但其强度还略优于前者。ＩＲ分析表明：臭氧漂白引起纤维素结晶指数的降低比常规漂白大。ＦＴ－ＩＲ差谱分析证明了漂白过程中木素的溶出。     

马尾松硫酸盐浆高白度TCF漂白新工艺

本试验着重对马尾松硫酸盐浆（Ｋａｐｐａ值：２６．７；粘度：９２８ｃｍ３／ｇ）氧脱木素的活化预处理，两段氧脱木素工艺，过氧化氢漂前活化处理等进行了大量的研究，在此基础上提出采用（ｘＯ１ｐ）Ｏ２ｙＰ漂序作为马尾松硫酸盐浆漂白流程，该流程可将其漂至８７．５％（ＳＢＤ）的高白度，而且整个过程不含氯元素，不采用投资较大的臭氧漂白，可操作性强，是一种值得推荐的硫酸盐浆ＴＣＦ漂白新工艺。     

麦草浆无氯漂白的研究

本文对麦草浆无氯漂白的可漂性能进行了研究，指出在保持纸浆具有良好的粘度下，用常规氧碱漂白和强化氧碱漂白分别可脱除残余木素达５０％和７０％以上，纸浆的白度可分别达到３８％ＩＳＯ和４９％ＩＳＯ左右。常规氧漂浆再用过氧化氢强化的氧漂继而可多脱除２０％～３０％的残余木素，纸浆白度高达６０％～６５％ＩＳＯ。麦草浆用ＴＣＦ漂白流程如ＯＯ／ＰＰ，在最终过氧化氢漂段的过氧化氢用量为２．０％时，可获得白度为７５％～８０％ＩＳＯ的纸浆，若采用单段带压的氧气和过氧化氢漂白，可将氧漂浆和本色浆漂到８０％ＩＳＯ的白度，且过氧化氢用量达３．５％～５．０％。考虑到ＴＣＦ漂白废水可逆流回用到碱回收，消除了漂白废水的污染，从而使漂白车间无废水排放。     

脱墨废报纸浆的漂白

本文对进口废报纸脱墨浆进行漂白实验研究，结果表明选用两段过氧化氢（Ｐ－Ｐ）漂白，漂白浆的白度可达７２％，漂损为２．４％。漂白浆的抗张指数可达生产中高档纸及纸板的要求，其它物理性能的检测也均可达到胶印书刊纸的国家标准。     

桉木预水解硫酸盐浆无元素氯漂白的研究

对桂术预水解硫酸盐浆无元素氯漂白方法进行了研究，并与少氯漂白方法比较。结果表明，Kappa值为12.2的未漂浆，用0-D1-E-D2-A漂序，漂白浆的白度达到93．1%SBD；当用0-Dl-E-H-D2-A漂序时，浆的粘度低，废水BOD5和CODcr含量升高1Kappa值为7．4的来漂浆用D1-E-D2-A漂序，可以把浆漂至90．6%SBD的白度。     

漂白温度及时间对烧碱-AQ法麦草浆H2O2漂白的影响

探讨了漂白温度及时间对麦草化学浆 Ｈ２ Ｏ２ 漂白的影响。结果表明： 在５０ ～９０ ℃之间, 漂后浆白度随漂白温度的提高而提高, 且出现漂白停滞现象的时间逐渐提前, 适当提高漂白温度或延长漂白时间不会对漂后浆的物理性质带来不利影响。     

桦木硫酸盐浆无氯漂白

本论文研究了桦木硫酸盐浆的无氯漂白。研究结果表明：桦木 酸盐浆经氧漂后能使白度提高５０％以上，常规氧漂、活化氧漂和强化氧漂分别可使白度达到４６．４％、５７．４％和６０．４％；高锰酸地氧漂及过氧化氢漂白均有活化作用；高锰酸钾活化作用只与加入量有关，而与加入次数无关。其最佳用量为０．８％；采用无氯漂白，Ｏｐ（ＡＱ）Ｐｐ漂白程序，可使所漂浆的白度达到８１．１％。     

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