亥磁共振技术对食品玻璃化及玻璃化转变温度的研究

本文综述了核磁共振技术（NMR）测定玻璃化转变温度的原理和一些实际应用的例子,以及NMR状态图的概念及其在食品玻璃化转变和转变前后食品理化性质变化的研究中的应用。     

核磁共振技术对食品玻璃化及玻璃化转变温度的研究

本文综述了核磁共振技术(NMR)测定玻璃化转变温度的原理和一些实际应用的例子,以及NMR状态图的概念及其在食品玻璃化转变和转变前后食品理化性质变化的研究中的应用.     

快速测量食品玻璃化转变温度新方法的研究

食品的玻璃化转变是影响食品品质和稳定性的关键因素。准确测量食品的玻璃化转变温度对改进食品的加工和贮藏条件非常重要。核磁共振技术(NMR／MRI)在研究食品玻璃化转变过程和测最玻璃化转变温度方面，具有一定的优势。它作为一种先进的分析测量工具，在食品科学领域具有广阔的应用前景。     

淀粉的玻璃化转变及其对食品品质的影响

本文在有关玻璃态和玻璃化转变理论的基础上,综述了淀粉玻璃化转变的分析方法、性质以及对食品品质的影响,并对今后的研究方向作了展望。     

淀粉玻璃化转变及其对食品品质影响

淀粉是以谷物为原料的食品主要成分,而淀粉玻璃化转变对食品品质,特别对质构具有显著影响。该文在有关玻璃态和玻璃化转变理论基础上,综述淀粉玻璃化转变分析方法、影响因素及其对食品品质影响,并对今后研究方向进行展望。     

玻璃化转变在冷冻与干燥食品中的应用

玻璃化转变在冷冻与干燥食品中的应用陈洁（无锡轻工大学食品学院，无锡２１４０３６）庄俊华（常州同大公司，常州２１３０１４）０前言“玻璃化转变”定义是指非晶聚合物的力学性质随温度变化，出现玻璃态与高弹态之间的转变。对应的转变温度即为玻璃化转变温度Ｔｇ．事...     

速冻食品的玻璃化加工及保藏

介绍了速冻食品的玻璃化转变及玻璃化转变温度的测定方法,另外对玻璃化理论今后在速冻食品加工与保藏中的应用方向和研究重点也进行了探讨。     

淀粉的玻璃化转变及其对食品品质的影响

淀粉的玻璃化转变关系到以淀粉为原料的食品的质构和货架寿命,已成为当今研究热点,在有关玻璃态和玻璃化转变理论的基础上,综述了淀粉玻璃化转变的分析方法,性质以及对食品品质的影响,并对今后的研究方向作了展望。     

淀粉的玻璃化转变

综述了淀粉的玻璃化转变过程及转变温度的测定方法、影响因素，以及玻璃化转变过程在淀粉类食品加工及贮藏方面的研究进展，并提出了目前淀粉的玻璃化转变研究领域存在的问题，展望了今后的研究方向，以期为后续研究玻璃化转变温度时选择适宜的测定方法提供参考。     

玻璃化转变与食品的加工、储存和品质

论述了食品的玻璃化转变与其加工、储存工艺及产品品质间的关系。重点介绍了玻璃化转变对食品的冷冻及干燥工艺的影响,淀粉玻璃化转变对食品的品质的影响,冰淇淋的冷冻保藏和玻璃化法超低温保存等。     

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