月桂酸异戊酯的催化合成

以纳米型复合杂多酸H3PW12O40/SiO2为催化剂,月桂酸和异戊醇为原料,合成月桂酸异戊酯。实验结果表明,纳米复合磷钨酸是合成月桂酸异戊酯的良好催化剂,适宜的工艺条件为酸醇物质的量比为1︰5、催化剂用量占酸质量的5%、回流反应时间为2h,酯化率可达99.1%。     

葡萄酒香料己酸丁酯的催化合成

以纳米型H3PW12O40/SiO2为催化剂,己酸和丁醇为原料,合成酒用香料己酸丁酯.实验结果表明,纳米复合磷钨杂多酸是合成己酸丁酯的良好催化剂,适宜的工艺条件为:酸醇物质的量比为1:1.2,催化剂用量为5%,反应时间为1.5 h,酯化率可达99.2%.     

纳米复合杂多酸催化合成己酸乙酯的研究

以纳米型H3PW12O40／SiO2为催化剂，己酸和无水乙醇为原料，合成曲酒香料己酸乙酯，实验结果表明，纳米复合磷钨杂多酸是合成己酸乙酯的良好催化剂，适宜的工艺条件为：酸醇物质的量比为1：1．8，催化剂用量5％，带水剂甲苯为5mL，反应时间2h，酯化率可达97．1％。     

酵母展示脂肪酶催化合成葡萄酒香料己酸丁酯

以毕赤酵母展示的南极假丝酵母脂肪酶B为催化剂,已酸和丁醇为反应底物,合成葡萄酒用香料己酸丁酯。结果表明,酵母展示脂肪酶是合成己酸丁酯的良好催化剂,其最适催化工艺条件为：酸醇物质的量比为1：1．2,催化剂展示脂肪酶用量为2％,反应时间为4h,酯化率可达97．2％。     

稀土复合固体超强酸催化合成食用香料乳酸正丁酯

研究了以纳米稀土复合固体超强酸SO4^2/ZrO2Nd2O3为催化剂，以乳酸和正丁醇为原料合成乳酸正丁酯。通过正交试验考察了影响酯化反应的主要因素，确定的最佳合成条件为：乳酸用量为0．1mol时，正丁醇与乳酸物质量之比为3．0：1，催化剂用量为0．55g，带水剂环己烷15mL，回流反应2．0h，酯化率可达98．7％。该催化剂回收简单，重复使用7次后酯化率仍超过96％。     

纳米固体超强酸SO42-/TiO2催化合成酒用香料丁酸异戊酯

以纳米固体超强酸SO4^2-／TiO2为催化剂，通过丁酸和异戊醇反应合成丁酸异戊酯。实验结果表明，纳米固体超酸SO4^2-／TiO2是合成丁酸异戊酯的良好催化剂，最佳反应条件为：酸醇物质的量比为1：1．3，催化剂用量为0．4g／0．2mol丁酸，反应时间为2h。此时酯化率可达98．2％，并且催化剂可以多次重复使用。     

稀土复合固体超强酸SO4^2-／ZrO2-Nd2O3催化合成乳酸正丁酯

研究了以纳米稀土复合固体超强酸SO4^2-／ZrO2-Nd2O3为催化剂,以乳酸和正丁醇为原料合成乳酸正丁酯。通过正交实验考察了影响酯化反应的主要因素,确定的最佳合成条件为：乳酸用量为0．1mol时,正丁醇与乳酸物质的量之比为3．0：1,催化剂用量为0．55g,带水剂环己烷15mL,回流反应2．0h,酯化率可达98．7％。该催化剂回收简单,重复使用7次后,酯化率仍在96％以上。     

纳米复合杂多酸催化合成水杨酸异戊酯

以纳米型复合杂多酸H3PW12O40/SiO2为催化剂,水杨酸和异戊醇为原料,合成水杨酸异戊酯.结果表明,纳米复合磷钨酸是合成水杨酸异戊酯的良好催化荆,适宜的工艺条件为:酸醇物质的量比为1∶1.5,催化剂用量占酸质量的5%,回流反应时间为2h,酯化率可达98.0%.     

纳米复合磷钨酸催化合成琥珀酸二乙酯的研究

以纳米型H3PW12O40/SiO2为催化剂,琥珀酸和乙醇为原料合成琥珀酸二乙酯。实验结果表明,纳米复合磷钨杂多酸是合成琥珀酸二乙酯的良好催化剂,适宜的工艺条件为酸醇物质的量比为1∶6、催化剂用量为5%、反应时间为5h,此时酯化率可达92%。     

酒用香料己酸丁酯的催化合成研究

以固体酸Ti(SO4)2/SiO2为催化剂,己酸和正丁醇为原料,合成酒用香料己酸丁酯。考察了催化剂用量、醇酸摩尔比、反应时间等因素对酯化率的影响,得出固体酸Ti(SO4)2/SiO2催化合成己酸丁酯的优化合成条件为:n(正丁醇)∶n(己酸)为3∶1,反应时间为1.5 h,催化剂用量为0.30 g(以0.05 mol己酸计),在此条件下酯化率可达97.17%,催化剂重复使用性能较好。     

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