柚子籽油微胶囊制备工艺优化及稳定性研究

以柚子籽油为芯材,对喷雾干燥法制备微胶囊的工艺进行研究,优化得到的最佳工艺条件为:大豆分离蛋白/β-环糊精为复合壁材,壁材间质量比1∶0.5、壁材质量分数30%、芯壁比1∶1、乳化剂1.5%、进口温度170℃。由此得到柚子籽油微胶囊包埋率达到(88.9±2.1)%,包埋效果良好。同时对微胶囊产品进行了基本性质和稳定性研究,结果表明该产品具有良好的特性和稳定性,基本满足一般食品加工要求。     

响应面法优化海英菜籽油微胶囊化工艺

为减缓海英菜籽油的氧化速度,提高稳定性,以酪蛋白、β-环糊精为壁材,采用微胶囊-喷雾干燥法制备海英菜籽油微胶囊。通过单因素试验,选择芯材含量、包埋时间、β-环糊精含量、单甘脂含量为影响因素,包埋率为响应值。通过响应面分析法确定海英菜籽油微胶囊化的最佳工艺参数:芯材含量18.3%、包埋时间50.7 min、β-环糊精含量41.1%、单甘脂含量50.4%,在该条件下海英菜籽油微胶囊包埋率为93.82%。     

红枣黄酮微胶囊制备条件的研究

以红枣黄酮为芯材,β-环糊精为壁材,采用分子包埋法制备红枣黄酮微胶囊。研究β-环糊精的浓度,芯材和壁材的配比,搅拌时间以及搅拌温度4个因素对红枣黄酮微胶囊包埋率的影响,最终利用正交试验来确定其最佳工艺条件。结果表明包埋法制备红枣黄酮微胶囊的最佳工艺为:芯材与壁材的配比为1∶1.5(质量比),搅拌时间为50 min,β-环糊精浓度为14%,搅拌温度为30℃,经试验验证包埋率可达到45.2%。     

元宝枫油脂微胶囊加工技术参数的研究

以大豆分离蛋白、β-环糊精为壁材,元宝枫籽油为芯材,单硬脂酸甘油酯为乳化剂,通过喷雾干燥法制备微胶囊化元宝枫籽油粉末油脂.在温度170℃的条件下,考察了壁芯比、复配壁材比例、壁材浓度对微胶囊化元宝枫籽油粉末油脂包埋率的影响,通过正交试验确定最佳工艺条件为壁芯比为4∶1(g/g)、β-环糊精与大豆分离蛋白的壁材配比为3∶...     

响应面法优化大鲵油微胶囊制备工艺

为了提高大鲵油的稳定性,采用喷雾干燥法制备大鲵油微胶囊。对壁材进行选择后,以包埋率为指标,研究壁材配比、壁芯材质量比、壁材添加量和乳化剂添加量对大鲵油微胶囊化的影响。通过单因素实验,利用响应面软件Box-Behnken设计模型确定大鲵油微胶囊化的最佳工艺条件。结果表明:大鲵油微胶囊化的最佳工艺条件为壁材配比(β-环状糊精与阿拉伯胶质量比)3.44∶1、壁芯材质量比5.37∶1、壁材添加量6.46%、乳化剂添加量2%(以壁材质量计)。在最佳工艺条件下,大鲵油微胶囊包埋率为88.06%。     

沙棘籽油微胶囊制备及其特性研究

基于复合壁材的沙棘籽油微胶囊制备工艺,以包埋率为指标,在单因素实验基础上采用正交实验优化制备工艺,并对其特性及微胶囊化对沙棘籽油性质的影响进行了研究。结果表明:制备沙棘籽油微胶囊的最佳工艺条件为以酪蛋白酸钠和麦芽糊精为壁材、酪蛋白酸钠与麦芽糊精质量比1∶1、壁材与芯材质量比2∶1、固形物含量20%。最佳工艺条件下制备的沙棘籽油微胶囊产品粒径分布均匀,包埋率可达96. 15%;热失重分析说明沙棘籽油微胶囊具备良好的热稳定性;微胶囊化前后,沙棘籽油不饱和脂肪酸含量变化不大;经过微胶囊包埋的沙棘籽油与未包埋的沙棘籽油相比,氧化诱导时间在高温加速储存过程中明显延长,具备较好的氧化稳定性。     

牡丹籽油微胶囊的制备及特性研究

研究以阿拉伯胶和β-环糊精为壁材,牡丹籽油为芯材,采用喷雾干燥法制备牡丹籽油微胶囊,并对其制备工艺及特性进行研究。结果表明:牡丹籽油微胶囊的最佳制备工艺条件为复合壁材阿拉伯胶与β-环糊精质量比1∶2、芯材与壁材质量比1∶2、乳化液总固形物含量20%;在最佳制备工艺条件下制得的牡丹籽油微胶囊产品颗粒圆整、大小分布均匀、囊壁表面平整光滑,包埋率可达86.32%;牡丹籽油微胶囊在常规的热加工处理过程中结构仍然完整,具有良好的热稳定性;牡丹籽油微胶囊化对牡丹籽油的主要功能成分α-亚麻酸的含量基本没有影响。     

冷冻干燥法制备甜杏仁油微胶囊

以酪蛋白、麦芽糊精为壁材,甜杏仁油为芯材,优化确定最佳微胶囊化工艺,采用冷冻干燥法制备甜杏仁油微胶囊。结果表明,利用冷冻干燥法制备甜杏仁油微胶囊的最佳配方为芯材含量22%、乳化剂含量2.2%、酪蛋白含量5%、均质时间7min。在此条件下,得到甜杏仁油微胶囊粉末质地疏松,包埋率85.83%。     

大豆多肽微胶囊的制备及抗氧化活性研究

以碱性蛋白酶水解制备所得大豆多肽为芯材、β-环糊精为包埋壁材制备大豆多肽微胶囊.以包埋率为评价指标,通过单因素、响应面优化试验得到制备大豆多肽-β-环糊精微胶囊的最佳工艺条件,并探究大豆多肽微胶囊的抗氧化能力变化.结果 表明:大豆多肽微胶囊的最佳制备工艺条件为壁芯质量比2∶1、包埋时间16 min、包埋初始pH 7.0...     

包络结合法制备β-环糊精鱼油微胶囊

对以β-环糊精为壁材、稀碱法提取鱼油为芯材,利用包络结合法制备鱼油微胶囊的工艺参数进行了研究。结果表明:以产率,效率,产品的外形和粒径大小作为评价指标,得出制备鱼油微胶囊的最佳工艺条件为:m(芯材)∶m(壁材)=1∶7,搅拌时间2h,搅拌温度45℃,乳化剂吐温80的使用量0.3 g/g鱼油。按此工艺得出的鱼油微胶囊,包埋率为90.75%,包埋效率为89.34%,电子扫描显微镜观察最终的微胶囊具有典型的柱状结构。     

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