分散荧光染料小浴比染色工艺的优化

以表观深度和荧光强度为评价指标,采用正交试验研究染色温度、染色pH值和荧光增白剂用量对分散荧光红G、分散荧光黄8GFF和分散荧光橙2GFL小浴比染色效果的影响。通过拼色试验和工厂放样,进一步验证了优化工艺的可行性。三只染料优化的染色工艺分别为:分散荧光红G和分散荧光橙2GFL染色温度为133℃,染色pH值分别为6和5,不宜添加荧光增白剂;分散荧光黄8GFF染色温度为130℃,染色pH值为5,荧光增白剂用量不超过2.0 g/L。     

荧光腈纶纱线的荧光性能

针对荧光腈纶纱线经过普通工艺染色后荧光效果大大降低的问题,以荧光腈纶纱线为主要研究对象,分析染色工艺因素、三原色染料的单色染色以及荧光增白剂的加入对其荧光效果的影响。通过荧光反射率测试,确定纱线最佳染色工艺为染色温度85 ℃,染色时间75 min,染色pH值3.5;同时通过荧光光谱分析,研究纱线染色工艺与荧光性能的关系。试验结果表明,通过优化染色工艺并筛选合适的染料能获得具有较好荧光效果的有色荧光腈纶纱线,加入荧光增白剂后有助于进一步提高荧光黄10GFF和艳红X-5GN染色纱线的荧光效果。     

涤棉针织物的分散荧光黄/涂料荧光黄染色

以最为常见的黄色高可视警示服为例,采用分散荧光黄10G和涂料荧光黄对涤棉混纺针织物进行二浴法染色,讨论了分散染料质量分数、涂料质量浓度、染色温度、染色时间及染浴pH值对染色织物K/S值及荧光性能的影响。优化的染色工艺为:采用分散荧光黄10G和涂料荧光黄对涤棉混纺织物染色,分散荧光黄染料质量分数3%(omf),染色温度125℃,染色时间25 min,染浴pH值4;荧光涂料黄质量浓度5 g/L,染色温度65℃,染色时间30 min。染色后涤棉混纺织物的亮度系数β和色度x-y值均能满足国家标准要求,色牢度达到4级。     

分散荧光染料涤纶低温染色工艺

将苯甲醇用于涤纶分散荧光染料低温染色,研究了苯甲醇用量、分散剂用量、染料用量、染浴pH、染色温度、染色时间等对涤纶染色K/S值的影响,并测试了染色织物耐皂洗和耐摩擦色牢度。结果表明:苯甲醇可作为涤纶分散荧光染料低温染色助剂,可有效降低涤纶染色温度;涤纶低温染色的最佳染色工艺为pH=5、100℃保温60 min、分散荧光黄10GN的苯甲醇用量为15 mL/L、分散荧光红R-G的苯甲醇用量为45 mL/L,低温染色处理织物的耐皂洗和耐摩擦色牢度均可达到4~5级。     

环卫职业服面料仿丝绸染整工艺

针对我国环卫服面料普遍存在的荧光度差、不耐洗和穿着不透气等缺陷,探讨了采用常用分散荧光染料对全涤环卫服面料染整加工过程中不同染料用量、染色温度、染色时间和染浴pH值等因素对织物K/S值及亮度系数β的影响,并根据仿丝绸染整工艺进行中样生产实践。结果表明,经25 g/L NaOH碱减量处理后,环卫服面料较佳染色条件为：染色温度130 ℃,染色时间60 min,染色pH值4～5 。以1.1%(omf)荧光黄10G和0.9%(omf)荧光红G拼色,并结合亲水柔软整理,生产的面料符合《职业用高可视性警示服》橘红色标准要求,并可满足30次水洗。     

Dralon异形腈纶纤维染色工艺初探

采用阳离子红X-GRL、阳离子黄X-5GL、阳离子蓝X-BL对Dralon异形腈纶纤维的染色工艺进行探讨.通过正交试验和单因素试验得到最佳染色工艺的p H、温度及1227匀染剂用量.若浴比定为1∶40,最佳工艺分别为:阳离子红X-GRL染色p H=5,染色温度95℃,匀染剂1227用量为1%(omf);阳离子黄X-5GL染色p H=5,染色温度100℃,匀染剂1227用量为2%(omf);阳离子蓝X-BL染色p H=5,染色温度95℃,匀染剂1227用量为1.5%(omf).     

分散荧光红G染色工艺的探讨

讨论了pH、水质、染色温度、保温时间及用量对分散荧光红G在涤纶纤维上的上染性能的影响,得出了分散荧光红G的最佳上染工艺:TF-212K匀染剂0.8 g/L,螯合分散剂TF-510C 0.8 g/L,AB-45 0.5 g/L,硫铵0.2 g/L,pH=5.5~7.0,染色温度为130℃,保温50 min。用量3.0%时,色光纯正,提升性好,得色率佳,布面效果优良。     

阳离子荧光增白剂TF-921

探讨了阳离子型荧光增白剂TF-921对腈纶织物的增白工艺及增白效果,研究了增白剂用量、染浴pH值、上染温度、保温时间等因素对腈纶增白效果的影响。结果表明,荧光增白剂TF-921-亚漂一浴法增白的优化工艺为:增白剂0.4%～1.0%(omf),采用草酸调节染浴pH值为3～4,上染温度为90～100℃,保温时间为20～40 min,焙烘温度120～130℃。     

酸性荧光黄73对羊毛织物的染色

采用酸性荧光黄73对羊毛织物进行染色,探讨染色pH值、染色温度、染色时间、电解质NaCl浓度、染料用量对羊毛表观色深K/S值的影响,分析染色织物的荧光效果,测试染色织物的牢度。研究结果表明:染色织物的K/S值随着染色温度的升高和染色时间的延长而逐渐增加,随着染色pH值和NaCl用量的增加染色织物的K/S值逐渐下降,染色织物具有一定的荧光强度,可满足除警示服外的其他服饰的荧光要求;酸性荧光黄73用量为2%(owf)时,对羊毛的最佳染色工艺为:染色pH值5,染色温度高于80℃,染色时间40 min;且染色织物具有较好的耐洗和耐摩擦牢度。     

抗紫外涤纶分散染料染色性能

采用分散黄4RFN、分散红3B和分散蓝2BLN染料对抗紫外涤纶织物进行染色。探讨了染色温度、染色时间、pH、分散剂NNO和染料用量对抗紫外涤纶织物染色性能的影响,测试了染色K/S值、耐洗和耐摩擦色牢度。结果表明:当染料用量为1%(omf)、分散剂用量为2 g/L、pH为4~6、染色温度为100℃、染色时间为60 min时,抗紫外涤纶可获得较高的染色K/S值和优良的染色牢度。     

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