混合废纸脱墨浆FAS漂白工艺

研究氧化还原两段漂白中还原漂剂FAS对混合废纸脱墨浆的漂白效果。在H2O2预漂白处理浆料的基础上,加入FAS进行还原漂白,探讨漂白温度、漂白时间以及FAS用量对浆料白度的影响。结果表明:在碱比0.4、FAS用量0.6%、浆浓8%、时间40min,温度75℃的条件下,漂白效果、生产成本达到最佳条件。     

FAS漂白混合废纸脱墨浆的工艺研究

研究氧化还原两段漂白中还原漂剂FAS对混合废纸脱墨浆的漂白效果。在H2O2预漂白处理浆料的基础上,加入FAS进行还原漂白,探讨不同漂白温度、漂白时间以及FAS用量对浆料白度的影响。结果表明在碱比为0.4、FAS用量0.6%、浆浓8%、时间40min、温度75℃时,漂白效果、生产成本达到最佳。     

二氧化硫脲漂白废纸脱墨浆的工艺优化

用二氧化硫脲(FAS)漂白混合废纸脱墨浆,探讨FAS用量、NaOH与FAS的碱比、浆浓、漂白温度和漂白时间对漂后纸浆白度的影响。结果表明,浆浓8%,FAS用量0.6%,温度80℃,时间60min时,NaOH与FAS的碱比0.5∶1最佳,浆的白度可达82.8%ISO,白度增值为5.4%ISO;延长漂白时间到65min,碱比调整为0.4:1或0.45:1,浆白度可达82.4%ISO,白度增值为5.0%ISO。     

FAS漂白混合废纸脱墨浆的工艺研究

研究氧化还原两段漂白中还原漂剂FAS对混合废纸脱墨浆的漂白效果。在H2O2预漂白处理浆料的基础上,加入FAS进行还原漂白,探讨不同漂白温度、漂白时间以及FAS用量对浆料白度的影响。结果表明在碱比为0.4,FAS用量0.6%,浆浓8%,时间40min,温度75℃时,漂白效果、生产成本达到最佳条件。     

FAS在杉木CTMP漂白中的应用研究

对杉木CTMP组合漂白中的FAS漂白进行了研究.结果表明,FAS漂白中m(NaOH):m(FAS)的最佳值为0.5,FAS适宜进行高温短时间漂白,90℃、30 min时漂白效果良好.FAS与H2O2结合的两段漂白可以将浆料漂白至更高的白度,其中FAS漂白置于H2O2漂白之后,可获得更好的漂白效果,与FAS漂白置于H2O2漂白之前相比,白度可提高1～2个百分点.以FAS漂白为结束段的三段漂白,浆料色相得到改善,白度达到82.8%,且其废水污染负荷和色度较低.FAS漂白对漂白浆料强度性能无不良影响,与未漂浆相比,含FAS的三段组合漂白浆的抗张指数(28.2 N·m/g)、撕裂指数(4.70 mN·m2/g)和耐破指数(1.62 kPa·m2/g)分别提高了100%、22%和70%.     

甲脒亚磺酸杨木APMP漂白效果的探讨

探讨了甲脒亚磺酸（FAS）用于杨木碱性过氧化氢化机浆（APMP）漂白时，FAS用量、NaOH和FAS用量比、浆浓、漂白温度和时间对漂后纸浆白度的影响，通过实验得出最佳工艺条件：FAS用量0.6%(对绝干浆的质量分数），漂白浓度10％,温度70℃，时间60min，FAS与NaOH用量比为2，得到漂白浆白度为62.3%SBD，白度提高了9.8%SBD。通过对Na2S2O4、H2O2单段票白的研究，从纸浆白度、强度、废水污染负荷和工艺条件等方面与FAS漂白效果进行了比较，得出FAS是一种较清洁和经济的新型漂白剂。     

废纸脱墨浆FAS漂白及TAED活化H_2O_2两段漂白的实验研究

本实验研究了废纸脱墨浆的FAS漂白工艺及其影响因素,探讨了FAS用量、NaOH用量、温度、时间对纸浆白度的影响,以及FAS漂白(F)和TAED活化H2O2(P)两段漂白工艺条件。结果表明,影响废纸脱墨浆漂白效果的顺序为:FAS用量时间温度NaOH用量;废纸脱墨浆FAS漂白的最佳工艺条件为:FAS用量0.6%,NaOH用量0.3%,温度70℃,时间30min。PF两段漂白优于FP两段漂白。     

甲脒亚磺酸（FAS）用于磨木机械浆漂白的研究

对用甲脒亚磺酸(FAS)漂白马尾松机械浆，探讨了FAS用量、浆浓、漂白温度和时间对漂后纸浆白度的影响。为了与常用的双氧水(H2O2)单段漂作对比，同时也进行了简单的双氧水单段漂，得出在高白度漂白时，双氧水漂白要强于FAS，但在低白度漂白时，FAS仍具有一定的竞争力。     

杨木化学浆甲脒亚磺酸-过氧化氢的漂白工艺

甲脒亚磺酸(FAS)是一种新型漂剂,在工业上也称二氧化硫脲。以杨木为原料,研究在CEHP漂白流程中的过氧化氢(P)漂段添加漂白助剂甲脒亚磺酸后的最佳漂白工艺及结果。结果表明,当FAS用量0.4%、H2O2用量1.8%、温度70℃、时间100min、NaOH用量1.7%时,纸浆漂白后得率97.61%,白度85.12%ISO,抗张指数17.65N.m.g-1。相比于CEH三段漂后78.45%ISO以及未添加FAS时CEHP漂后82.22%ISO的纸浆白度,白度增值分别为6.67%ISO、2.90%ISO。FAS-H2O2漂白工艺节省了漂白时间,节约了漂剂,同时提高了纸浆白度。     

热磨机械浆甲脒亚磺酸单段漂和过氧化氢-甲脒亚磺酸两段漂

本文用甲脒亚磺酸(FAS)漂白热磨机械浆(TMP),探讨了FAS用量、NaOH和FAS用量比、浆浓、漂白温度和时间对漂后纸浆白度的影响,并进行了过氧化氢-甲脒亚磺酸两段漂白,比较了FAS单段漂白、H2O2-FAS、FAS-H2O2两段漂白的效果.     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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