非接触印刷废纸酶法脱墨研究

利用纤维素酶对非接触印刷废纸进行脱墨实验 ,并与化学脱墨效果进行比较。在本实验条件下 ,最佳脱墨条件为 :加酶量 :1.0 IU(CMCase) / g绝干浆 ,温度 :5 0～ 5 5℃ ,p H值 :5 .0～ 5 .5 ,时间 :30～ 4 5 min;浆浓 :5 .0～ 5 .5 %。酶法脱墨与化学脱墨相比 ,酶脱墨浆白度比化学脱墨浆白度提高 1.6% ISO,打浆度下降 6 .4 OSR,酶法脱墨废水的 COD/ BOD5约为化学脱墨废水的三分之一     

混合办公废纸超声波酶法脱墨的研究

采用纤维素酶与超声波协同对混合办公废纸进行脱墨探索,实验结果表明,酶法脱墨的较佳工艺条件为纤维素酶处理温度50℃,纤维素酶用量为1．5IU／g,纤维素酶处理浆浓5％,纤维素酶处理时间60min,表面活性剂用量为0．05％,酶处理PH值为5．5,浮选时间15～20min,浮选浓度1％。超声波脱墨的较佳工艺条件为超声波频率...     

办公废纸酶法脱墨浆滤液还原糖离子色谱分析

在混合办公废纸脱墨过程中，不同特性的纤维素酶使纤维素降解产生还原糖的情况是不同的，文章利用离子色谱对此进行了分析研究。在实验条件下。纯的内切酶对纤维不产生降解；内切酶与外切酶协同作用(FPA／CMCase为0．029时)，纤维被降解产生一定量葡萄糖、纤维二糖等还原糖。这不利于酶脱墨浆纤维的强度；木聚糖酶对办公废纸纤维的降解作用甚微。     

混合办公废纸酶法脱墨的研究

将几种纤维素酶和半纤维素酶应用于混合办公废纸的酶法脱墨中。研究了碎浆时问和碎浆浓度对脱墨效果的影响，并对几种酶对混合办公废纸脱墨浆性能的影响进行了比较。研究表明，与对照浆相比，纤维素酶和半纤维素酶的加入能显著降低脱墨浆的尘埃度。同时，在较低酶用量作用下，酶处理可以改善脱墨浆的抗张强度。几种酶相比，单组分的内切酶DeniMax 401具有最好的脱墨效果，当酶用量为0．2ECU／g时，脱墨浆的尘埃度比对照浆下降了60．6％，并且保持了良好的物理性能。     

混合办公废纸酶法脱墨的研究

使用脂肪酶、木聚糖酶和纤维素酶对混合办公废纸进行脱墨试验,研究了三种酶的最佳脱墨工艺条件及酶法脱墨的优势。     

混合办公废纸和旧报纸在中试规模下的酶法脱墨

采用纤维素酶和聚木糖酶的混合物分别对混合办公废纸（MOW）和旧报纸（ONP）进行脱墨,评价了酶法脱墨的效果,并对酶法脱墨工艺进行优化。MOW和ONP进行酶法脱墨的最佳条件有所不同,在最佳条件下,MOW和ONP脱墨浆的最高白度分别为83．6％和41,9％,脱墨效率分别为6．0％和6．3％叠i采用化学法对MOW和饼ONP进行脱墨时,脱墨效率分别为2．9％和3．5％。常规化学法很难使MOW脱墨,酶法适用于MOW的脱墨。     

影响激光打印办公废纸酶法脱墨效率的主要参数

用黑曲霉产生的纤维素酶（C）和半纤维素酶（H）,在实验室规模下对激光打印办公废纸进行了酶法脱墨研究。在优化酶水解的工艺下,最高脱墨效率为73%;优化的条件为：碎浆浓度1%,时间1min,温度50℃,pH值3.5,搅拌速率60r/min,浆浓4%,C和H的用量均为2.5U/g（两者质量比为1︰1）。进一步优化浮选工艺参数后,最高脱墨效率为95%;此浮选工艺为：用量0.5%（质量分数）的Tween80表面活性剂,pH值6.0,通入空气流速10L/min,温度45℃,时间15min。酶法脱墨浆的成纸性能较好,这说明了酶法脱墨工艺的有效性。     

办公废纸漆酶脱墨的研究

漆酶具有催化氧化酚类及芳胺粪化合物的能力，直接降解办公废纸中苯胺类印刷油墨及酚醛树脂等连接料，从而达到脱墨的目的。实验结果表明：漆酶脱墨最佳工艺杀件是：pH值4．5，温度40℃，反应时间40min，浆浓10％，浮选时间10min，酶用量9IU／g；在此条件下浆料白度为85．9％SBD，油墨脱除率达到72．04％。再经碱抽提后，脱墨浆的白度和油墨脱除率分别达到91．9％SBD和93.03％。此外，经漆酶脱墨后浆料的物理强度均有不同程度的提高，尤其是碱抽提后更为明显，滤水性也得到明显改善。     

静电复印废纸的化学法和酶法脱墨研究

静电复印纸的非接触式印刷．其油墨难以脱除,导致静电复印废纸回用较困难,而生物酶法脱墨是一种环境友好型脱墨方法。该文分别利用多种化学品和一种纤维素酶对静电复印废纸进行脱墨处理．并对脱墨实验条件进行优化．经浮选和洗涤处理去除油墨粒子。实验结果表明：与化学脱墨法相比,酶法脱墨的脱墨效率能够提高24．6％,脱墨浆的游离度提高了21．6％,滤水时间缩短11．5％;成纸的物理性能方面,耐破指数和抗张指数分别提高了15．3％和2．7％,而白度和撕裂指数分别降低了2．1％和21．9％;静电复印废纸的酶法脱墨效果优于传统的化学法脱墨。     

纤维素酶用于废纸脱墨

对纤维素酶在废报纸脱墨中的应用进行了实验性探索。实验结果表明：酶法脱墨能获得比化学法脱墨更好的脱墨效果，还能改善浆料的强度及其滤水性。同时，本次实验还较详细地探讨了影响酶法脱墨效果的各种因素，并确定了酶法脱墨最佳的工艺条件。     

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