微胶囊化蒜粉的贮存稳定性

研究了微胶囊化蒜粉的贮存稳定性,并与蒜粉做了比较。结果表明,微胶囊化蒜粉贮存10个月后,硫代亚磺酸酯心材保留率仍在95%以上。DSC测定蒜粉的玻璃化转变温度为-2.9℃,微胶囊化蒜粉的玻璃化转变温度为112℃。采用SEM观察微胶囊化蒜粉内部与外部结构,发现微胶囊化蒜粉表面具有很好的完整性和致密性。因而微胶囊化蒜粉具有良好的贮存稳定性。     

微波真空与真空联合干燥的蒜粉微胶囊特性

为了保护蒜氨酸酶在胃的酸性环境中不失活,从而能够催化蒜氨酸水解为蒜素,采用微波真空与真空联合干燥的蒜粉进行微胶囊化,在模拟肠液中研究了微胶囊化蒜粉的释放动力学。结果发现其可以通过胃的酸性环境而在肠道内释放,扫描电子显微镜观察发现微胶囊化蒜粉颗粒表面壁材结构具有很好的完整性和致密性,芯材很好地包埋于微胶囊中。比较了蒜粉和微胶囊化蒜粉的贮存稳定性,蒜粉的玻璃化转变温度为-2．9℃,微胶囊化蒜粉的玻璃化转变温度为112℃,微胶囊化蒜粉具有良好的贮存稳定性。微胶囊化蒜粉贮存10个月后,硫代亚磺酸酯芯材保留率仍在95％以上。     

热响应性微胶囊型热敏记录材料的研究

介绍了由微胶囊化的隐色染料和显色剂构成的热敏材料的热记录特性友微胶囊和其它成分的热特性。因酚系显色剂和微胶囊壁的相互作用，酚系显色剂的熔化温度Tm及微胶囊的玻璃化温度Tg显著下降。最低显色温度与降低了的Tm和Tg两者间有较高的温度一致性。     

壁材对真空低温喷雾干燥制备乳双歧杆菌Probio-M8微胶囊的影响

目的:研究不同壁材对真空低温喷雾干燥制备乳双歧杆菌Probio-M8微胶囊的影响。方法:对不同壁材微胶囊粉末的溶解度、再水合时间、粉末流动性以及粉末水分和水分活度的物理性质进行测定，使用荧光显微镜观测干燥前、后菌体细胞膜完整性的变化，扫描电镜观察微胶囊粉的形态结构，差示扫描量热仪测定微胶囊粉的玻璃化转变温度，并测定了不同壁材菌体的DPPH自由基清除能力和总抗氧化能力。结果:复合壁材的Probio-M8微胶囊粉末表现出较高的存活率，为73.8%，且具有较低的水分含量(4.85%)和水分活度(0.17)，粉末流动性也优于其它3种微胶囊粉末，然而，由于复合壁材组分复杂，复合壁材的微胶囊粉具有较低的溶解度和较长的再水合时间。此外，复合壁材保护的Probio-M8细胞膜的完整性也高于其它3种壁材保护的Probio-M8，有效地保护了菌体细胞膜的完整性，并具有较高的玻璃化转变温度和较强的抗氧化能力，有利于Probio-M8微胶囊粉的贮藏稳定性。结论:通过比较不同壁材对Probio-M8真空低温喷雾干燥后菌体活性的影响，发现不同的壁材对菌体有不同的保护效果，其中复合壁材可更有效保护菌体的活性。研究结果对乳双歧杆菌Probio-M8微胶囊的工业化生产有一定的参考意义。     

大豆蛋白的玻璃化转变

在有关玻璃态和玻璃化转变理论的基础上,综述了大豆蛋白玻璃化转变的分析方法、转谷氨酰胺酶处理的大豆蛋白低水分的玻璃化转变及大豆蛋白分子结构与其玻璃化转变关系,并对今后的研究方向作了展望。     

大豆蛋白的玻璃化转变

在有关玻璃态和玻璃化转变理论的基础上，综述了大豆蛋白玻璃化转变的分析方法、转谷氨酰胺酶处理的大豆蛋白低水分的玻璃化转变及大豆蛋白分子结构与其玻璃化转变关系，并对今后的研究方向作了展望。     

玻璃化转变对食品稳定性的影响

本文首先简要介绍玻璃化转变对黏度、扩散和反应速率的影响,而后从物理稳定性、化学稳定性和生物学稳定性三个方面详细论述了玻璃化转变对食品稳定性的影响。在玻璃化转变温度附近温度降低使黏度增大,但小分子物质的扩散系数不再进一步减小。食品可能因发生玻璃化转变而丧失稳定性,但玻璃化转变并不能成为衡量食品稳定性的唯一标准,发生玻璃化转变也不意味着食品稳定性立即丧失。根据玻璃化转变可以较好地预测食品的物理稳定性,而难以有效预测食品的化学和生物学稳定性。     

双包被番茄红素微胶囊特性分析

利用高效液相色谱测定一次包被和双包被番茄红素微胶囊产品中番茄红素的含量和顺式异构体比例,发现经一次包被微胶囊后番茄红素含量可达88.79 mg/g,其中顺式比例占番茄红素总量的45.53%;经双包被微胶囊后的番茄红素含量可达100.14 mg/g,其中顺式比例占番茄红素总量的48.79%。同时采用SEM,DSC,IR,XRD现代仪器分析手段对番茄红素产品进行表征,结果表明:双包被番茄红素微胶囊外部结构基本相近,均为近似球体的颗粒,平均直径在25μm左右,其水溶解性和分散性良好,在常温状态下不会发生玻璃化转变,分解程度低,储藏效果更为稳定,常温保持3个月,番茄红素保持率达到92.60%。     

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。     

玻璃化转变在食品贮藏中的应用研究进展

玻璃化转变是指无定形聚合物因受热从玻璃态到橡胶态(高弹态)或因冷却从橡胶态到玻璃态的转变.玻璃化转变是影响食品性质、加工特性和货架期的重要因素之一.文章介绍了玻璃化转变相关的基本理论,阐述了玻璃化转变在微生物和酿造发酵食品、果蔬、淀粉类食品、水产品、乳制品、冷冻禽畜肉类及糖果类食品贮藏方面的研究现状,并对玻璃化转变在食品贮藏的应用进行了展望.     

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