亚麻籽胶为壁材制备亚麻油微胶囊

选用亚麻籽胶为壁材,采用喷雾干燥法,对亚麻油进行微胶囊化。以微胶囊化效率和含油率为考察指标,考察制备亚麻油微胶囊的影响因素。结果表明:最佳喷雾干燥工艺条件:进风温度170℃,出风温度70℃,雾化器转速24000r/min,进料速度50.41mL/min;最佳微胶囊配方为:壁材与芯材比2:3(m/m)。在此工艺条件下,亚麻油的微胶囊化效率为95.32%,含油率59.48%。     

喷雾干燥法制备银杏油微胶囊的研究

以银杏中主要活性物质类黄酮的微胶囊化效率为考察指标,对银杏油进行微胶囊化处理,探讨喷雾干燥法制备银杏油微胶囊的工艺。结果表明,最佳微胶囊原料配方为：阿拉伯胶与β- 环糊精的比例为1:1(m/m),芯材与壁材的比例为1:3(m/m),料液浓度为25%(m/V),单甘脂为0.1%;最佳喷雾干燥工艺条件为：进料流量30ml/min,进风温度180℃,出风温度80℃。在此工艺条件下微胶囊化银杏油的效率可达到90.66%;制备的银杏油微胶囊为黄色或淡黄色细小颗粒,水分含量2.28%,密度0.82g/cm3,溶解度98.10%,黄酮含量5.73%,包埋效果良好。     

文冠果种仁油的微胶囊化及喷雾干燥条件研究

研究了不同壁材及壁材配比、固形物含量和芯材载量对文冠果种仁油微胶囊化效率的影响,并确定了采用喷雾干燥技术制备文冠果种仁油微胶囊产品的工艺条件。结果表明,文冠果种仁油的微胶囊化最佳配方为:壁材为明胶+蔗糖,二者质量比1∶5,固形物含量20%,芯材载量35%;喷雾干燥的最佳条件为:进风温度175℃,出风温度80℃,进料流量650 mL/h。在最佳工艺条件下获得的文冠果种仁油微胶囊产品感官品质较好,在保持低水分含量(仅为2.49%)的同时,兼具良好的溶解度和储存稳定性。     

响应面试验优化黑果枸杞花色苷微胶囊制备工艺及其稳定性分析

建立喷雾干燥法制备黑果枸杞花色苷微胶囊的方法,考察微囊化前后花色苷的稳定性。通过单因素试验,考察壁材中阿拉伯树胶质量分数、β-环糊精质量分数、芯壁比、进料流速、进风口温度、总固形物含量对黑果枸杞花色苷包埋效率的影响,采用Box-Behnken试验设计和响应面分析优化黑果枸杞花色苷微胶囊的包埋工艺。结果表明,黑果枸杞花色苷微胶囊的最佳制备工艺为:进料转速2 000 r/min、乳化时间10 min、出风口温度80℃、阿拉伯树胶质量分数1%、β-环糊精质量分数50%、进料流速330 mL/h的恒定条件下,选择芯壁比1:2.5(g/g)、进风口温度160℃、总固形物含量22%。黑果枸杞微胶囊包埋效率平均值可达91.01%。黑果枸杞花色苷微胶囊为类似圆球状的、平均粒径(9.16±1.02)μm的玫红色粉末,受光照、空气及温度的影响,明显比微胶囊化前稳定。     

番荔枝子油微胶囊化工艺

对番荔枝子油微胶囊化工艺进行研究。通过喷雾干燥法制备番荔枝子油微胶囊。在单因素试验基础上,采用正交试验法优化番荔枝子油微胶囊化工艺,确定了番荔枝子油微胶囊化工艺最佳条件:单甘酯添加量为1.6%,壁材与芯材比为2.0:1,进风温度为200℃,进料速度为4.0 mL/min。     

紫苏油粉末制备工艺研究

以脱皮、低温压榨紫苏油为芯材,利用乳化和喷雾干燥相结合的方法制备紫苏油粉末.确定的最佳制备工艺条件为:壁材大豆分离蛋白与麦芽糖糊精的比例1:1.2,乳化温度70 ℃,固形物含量25%,芯材壁材比40:100;均质压力50 MPa,均质2次;喷雾干燥进风温度168 ℃,出风温度85℃.该条件下制备的紫苏油粉末微胶囊化效率达95%,表面油含量为1%左右.     

木薯微孔淀粉微胶囊化罗非鱼油技术研究

以自制木薯微孔淀粉和罗非鱼皮胶原蛋白为复合壁材、罗非鱼鱼油为芯材,研究罗非鱼油喷雾干燥制备微胶囊的最佳工艺。结果表明,喷雾干燥用罗非鱼油乳化液的工艺条件为乳化温度55℃、乳化体系pH6.0、均质时间6min、芯材壁材配比1:1.5、罗非鱼皮胶原蛋白质量分数1.1%、乳化剂用量0.15%、固形物质量分数20%、进风温度180℃。依此条件生产的产品,鱼油包埋率达92.1%,微胶囊化效果较满意。     

怀远石榴籽油微胶囊的制备及稳定性研究

以怀远石榴籽油为芯材、麦芽糊精和大豆分离蛋白为复合壁材、大豆卵磷脂为乳化剂,采用喷雾干燥法制备石榴籽油微胶囊。在单因素试验基础上,通过正交试验对工艺条件进行优化。得到的最佳工艺条件为:复合壁材的质量分数10%,麦芽糊精与大豆分离蛋白的配比1∶2(质量比),乳化剂大豆卵磷脂的添加量2.0%,芯材与壁材的配比1∶1.5(质量比),喷雾干燥机进风温度185℃,出风温度75℃,进料速度25 mL/min。在最佳工艺条件下,石榴籽油的微胶囊包埋率可达81.9%。微胶囊化后的石榴籽油稳定性较好。     

甾醇酯微胶囊制备工艺研究

研究了喷雾干燥法制备微胶囊化甾醇酯的工艺。研究结果表明:微胶囊化甾醇酯的最优乳化条件为:复合乳化剂配比(单甘酯∶蔗糖酯)为1∶9;乳化剂用量0.75%;壁材用量20%;壁材比(变性淀粉∶麦芽糊精)为1∶5;芯材/壁材为0.5。喷雾干燥法制备甾醇酯微胶囊的最佳工艺参数为:进料温度50～60℃、均质压力50 MPa、进风温度180℃、出风温度80℃、喷雾压力180 KPa。在此工艺条件下微胶囊化效率可达77.8%。     

葡萄籽油微胶囊的制备及氧化稳定性研究

研究了葡萄籽油微胶囊的制备工艺及其氧化稳定性,以葡萄籽油为芯材,阿拉伯胶与麦芽糊精为壁材,在复合乳化剂的作用下进行乳化,以喷雾干燥法得到微胶囊产品并测定其氧化稳定性。研究表明阿拉伯胶与麦芽糊精重量比为3∶1,乳化剂浓度为10%,芯壁比为1∶2,温度为45℃,均质速度为12000r/min,乳化时间为12 min时制备得到稳定的葡萄籽油乳液,在进风温度180℃、出口温度80℃、进料速率5mL/min条件下喷雾干燥得到葡萄籽油微胶囊,葡萄籽油微胶囊化效率达到72.56%,60℃条件下贮藏葡萄籽油微胶囊的氧化速率明显降低,贮存性能和抗氧化性显著提高。     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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