氯化钠-过氧化氢-水三元体系的相平衡研究

利用等温法 ,在 10℃、15℃和 2 0℃下测定了氯化钠 -过氧化氢 -水三元体系相平衡 ,得到了平衡液相组成的密度和折光率。结果表明 ,氯化钠 -过氧化氢 -水是简单的三元体系 ,没有复盐的生成     

氯化钠——过氧化氢——水三元体系的相平衡研究

利用等温法，在10℃、15℃和20℃下测定了氯化钠--过氧化氢--水三元体系相平衡，得到了平衡液相组成的密度和折光率。结果表明，氯化钠--过氧化氢--水是简单的三元体系，没有复盐的生成。     

正己烷-乙醇-水三元体系的相平衡研究

研究正己烷-乙醇-水三元体系的相平衡及萃取中亚麻籽含水量与体系乙醇浓度的平衡关系。结果表明，乙醇-己烷-水构成的三元体系中，混溶程度随温度的升高和乙醇浓度的增大而增加。亚麻籽含水量与体系中乙醇浓度存在平衡关系，相应的平衡关系为：95％的乙醇浓度对应于7％～9％含水量的亚麻籽；90％的乙醇溶液对应于9％～11％含水量的亚麻籽；85％的乙醇溶液对应于10％～12％含水量的亚麻籽。     

硫酸钠-过氧化氢-氯化钠-水四元体系相平衡研究

在三元体系相平衡的基础上,应用等温法,测定了四元体系硫酸钠-过氧化氢-氯化钠-水在283K下的相互溶解度数据及平衡液相的密度和折光率,并绘制了相图。结果表明,在283K时,硫酸钠-过氧化氢-氯化钠-水体系中有四种固相析出,当过氧化氢的浓度小于50%质量分数时,相图存在两个三盐共饱点、五条两盐共饱线和四个单盐结晶区,分别为4Na2SO4·2H2O2·NaCl、Na2SO4·H2O·0.5H2O2、NaCl和Na2SO4·10H2O。此相平衡的测定,为4Na2SO4·2H2O2NaCl产品合成工艺路线和工艺条件的确定提供了理论依据。     

“正丁醇-水-茶油-皂素”微乳液体系的温度特性研究

通过绘制拟三元相图、测定电导率等手段,探讨“正丁醇-水-茶油-皂素”微乳液体系的温度特性。考察“正丁醇-水-茶油-皂素”体系外观形态、粒径大小及分布,确定该体系具备形成微乳液的能力,其微乳体系液滴的平均粒径为57.00 nm,多分散指数PDI为0.200。分析不同温度条件下体系形成能力、稳定性、电导率的变化,确定“正丁醇-水-茶油-皂素”属于温敏型体系,极端温度条件不利于W/O型微乳液的形成,优化得到最优的操作温度为70 ℃。     

[EMIM]+[BF4]-对乙醇-水体系相平衡的影响

[EMIM]^＋[BF4]^-是一种离子液体，本研究用改进的Othmer汽液平衡釜测定了101．3kPa下[EMIM]^＋[BF4]^-摩尔分率x3=0．1，0．2的乙醇-水-[EMIM]^＋[BF4]^-体系的汽液平衡数据，并用NRTL模型进行了关联，结果平均偏差为0．967％。实验表明：[EMIM]^＋[BF4]^-可以消除乙醇-水体系的共沸点，可以作为萃取精馏分离乙醇-水体系的溶剂。     

杀虫单一氯化钠一水体系相平衡研究及分析

本文测定地一10℃和50℃下杀虫一氯化－水三元体系相图，根据测得的相平衡结果，对现有杀虫单生产工艺提出了改进措施，同时也考察了添加剂对杀虫结晶形态的影响，工业实验表明，杀虫单产率和产品质量都有较大提高。     

低硬度麦草浆臭氧-过氧化氢TCF漂白

以低硬度硫酸盐麦草浆为原料，进行臭氧-过氧化氢(ZP)二段短序TCF漂白，结果表明：臭氧单段漂白适宜的工艺条件为：浆浓10％，pH值2～3，温度在20～30℃，臭氧用量3％；臭氧化处理后浆料的卡伯值为2.43，粘度为1001．6mL／g，卡伯值降低约65％，粘度损失率为20％左右。经过臭氧-过氧化氢二段漂白后，白度达到83％SBD。     

杀虫单—氯化钠—水体系相平衡研究及分析

本文测定了 - 10℃和 5 0℃下杀虫单—氯化钠—水三元体系相图 ,根据测得的相平衡结果 ,对现有杀虫单生产工艺提出了改进措施 ,同时也考察了添加剂对杀虫单结晶形态的影响。工业实验表明 ,杀虫单产率和产品质量都有了较大提高。     

水-醋酸-甲基叔丁基醚-氯化钠体系液液相平衡数据的测定

测定了常压下25℃时水-醋酸-甲基叔丁基醚-氯化钠体系液液相平衡数据.结果表明,加盐可以改善体系的液液平衡,有利于提高溶剂的选择性.分别采用Othmer-Tobias和Bachman方程对实验数据进行了关联,相关性系数均大于0.991,数据结果可靠.     

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.     

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     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.