绿氧在麦草碱法蒸煮中的应用试验

绿氧是90年代研制开发的造纸蒸煮助剂。本文在实验室条件下，对绿氧助剂进行了麦草碱法蒸煮的应用试验。同时用蒽醌（AQ）和改性蒽醌衍生物（MAQ）进行平行对比试验，以寻求绿氧对蒸煮的作用特点。1实验方法1．1蒸煮利用四罐装151电热回转式蒸煮锅，蒸煮前将药液、助剂及麦草（水分8％）混合均匀。1．2漂白在双层密封塑料袋中进行，并于恒温水浴锅中调好漂白温度，每隔20～30min取出揉搓，便漂白均匀。1．3漂后浆利用PFI磨打浆，打浆转数均为3000转。1．4漂后浆抄纸利用快速凯塞成形系统，抄造定量为609／m’的纸页。1．5原浆及漂后浆的…     

芦苇绿氧—烧碱法制浆工艺研究

继蒸煮助剂蒽醌（ＡＱ）和改性蒽醌衍生物（ＭＡＱ）及ＣＴ１等应用于碱法蒸煮以来,９０年代又出现了一种新的蒸煮助剂———绿氧,本文在实验室条件下,对芦苇进行了绿氧—烧碱法制浆工艺的应用试验。２．１芦苇Ｌ９（３４）绿氧烧碱法正交试验结果原料取自沅江造纸厂...     

蒸煮新型助剂的优选

对当前几种新型助剂从机理到实验进行了对比优选，得出了CT－1、绿氧是取代蒽醌较理想的蒸煮助剂。     

蒸煮助剂的制备及其在竹材制浆中的应用

论文研究了蒸煮助剂的制备工艺及其在竹材制浆中的应用。研究结果表明,添加助剂对竹材烧碱法蒸煮的强化脱木素作用效果明显。当助剂C用量为0.07%时,与烧碱法蒸煮工艺相比,得率增加了6.9%,卡伯值降低了8.1,裂断长增加了85.7%,耐折度提高了1倍;与硫酸盐法蒸煮工艺相比,得率提高了1.94%,卡伯值降低了4,成纸强度相当。添加助剂C后成浆和成纸的性能均高于添加绿氧,红外光谱分析可知助剂C和绿氧结构不同,并且均不同于蒽醌,改善了水溶性,有利于蒸煮。     

新型蒸煮助剂在亚铵法制浆生产中的应用

<正>1前言蒸煮工艺在制浆造纸过程中具有举足轻重的作用。目前,蒽醌虽然为众多纸厂所采用。但是蒸煮效果并不是十分理想,如成本较高,污染严重,特别是蒽醌毒性较大,对人体危害严重等。鉴于这种现状,道纯化工技术公司研制并生产出一种能完全代替蒽醌在蒸煮过程能提供活性氧的绿色蒸煮助剂"绿氧。"     

不同蒸煮助剂对中林杨-46制浆性能的影响

对菏泽地区5年生中林杨-46的化学成分及纤维形态进行分析,并对其制浆性能进行研究,对比不同工艺条件及造纸助剂对中林杨-46制浆的影响。中林杨-46碱性亚硫酸盐法制浆最佳蒸煮工艺条件为:用碱量(Na2O计)23%,亚硫酸化比40%,绿氧用量0.5%,安蓝用量0.05%,液比1∶4.5,最高温度165℃,一次升温90min至140℃保温60min,二次升温40min至165℃保温50min。添加蒸煮助剂可以明显改善中林杨-46碱性亚硫酸盐浆性能,其中使用绿氧代替蒽醌,并添加安蓝作为蒸煮促进剂,效果最佳,其粗浆得率53.65%,卡伯值12.7,黏度1351 mL.g-1。     

氢化蒽醌及蒽醌衍生物对麦草蒸煮的作用及其数学模型

研究了氢化蒽醌以及蒽醌衍生物对麦草烧碱法蒸煮的作用，用计算机处理蒸煮结果，得到6个关于添加剂用量与蒸煮效果关系的数学模型，并对蒸煮过程进行了分析。研究结果表明，氢化蒽醌是比较适合用作麦草制浆的蒸煮添加剂。     

中性亚钠加绿氧蒸煮芦苇的研究

研究了绿氧作为助剂在芦苇中性亚硫酸钠法蒸煮过程中的使用效果。通过正交实验,确立了实验室最佳蒸煮条件为绿氧0.15%（对绝干原料）,Na2SO3 28%（以Na2SO3计,对绝干原料）,Na2CO3 6%(以Na2CO3计,对绝干原料）,液比1：5,升温时间125min,最高温度165℃,保温时间3h。再现性实验表明：利用该条件蒸煮的苇浆与不加绿氧助剂蒸煮的苇浆相比,卡俾值降纸了6个单位,粗浆得率提高1%,纸浆粘度增加了401mL/g。     

预磺化麦草碱法制浆工艺的研究

研究了麦草预磺化和蒸煮的条件与方法，实验证明：烧碱－蒽醌法为预磺化后原料的最佳蒸煮方法，脱木素选择性最高，在相同的烧碱－蒽醌蒸煮条件下，酸性预磺化的效果较差，弱碱性条件下预磺化脱木素的效果最好。     

同类木素磺酸盐用作蒸煮助剂的试验

通过对蒸煮黑液碱木素的提纯和磺化改性，将其用作同种原料蒸煮助剂．实验比较了拉开粉、草酸钠、JFC与同类木素磺酸盐的蒸煮效果，实验结果显示：添加1．0％甲醛、1．0％亚硫酸钠和0.2％木素磺酸盐共同作用能有效提高烧碱蒽醌法蒸煮棉秆的蒸煮质量，所得纸浆细浆得率提高4．7％，未漂浆白度提高了14．3％ISO，卡伯值下降了7．72。使用效果非常明显．     

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