微胶囊槲皮素的制备及其在油脂中的抗氧化性能

以大豆蛋白、乙基纤维素、单甘酯作为复合壁材,对槲皮素进行微胶囊化,用正交试验方法确定其最佳包埋条件,探讨了微胶囊槲皮素在油脂中的抗氧化活性。结果表明,芯材槲皮素与复合壁材的比为10:90、大豆蛋白与乙基纤维素之比为4:1、乳化剂单甘酯的添加量为壁材质量的0.3%,槲皮素微胶囊化效果最好,包坦率最高;其对油脂具有较强的的抗氧化作用,且具有剂量效应关系,在相同浓度时,微胶囊槲皮素的抗氧化活性强于BHT、PG和Vc。     

用分子包埋法对BHT进行微胶囊化研究及应用

本文研究以β-环糊精为壁材,采用超声波法对抗氧化剂BHT进行微胶囊化。以产品的包埋率、产率为评定指标,选取最佳心材与壁材的配比,最佳处理时间。结果表明:心材与壁材的最佳比例为12:88,最适超声波时间为45min。     

黄秋葵花黄酮的酵母微胶囊制备及其对油脂的抗氧化能力

采用新型的生物包埋技术,用酵母细胞为壁材,以黄秋葵花黄酮为芯材,通过正交试验探讨包埋的最佳条件。结果表明,在芯壁比4∶1,振荡温度30℃,振荡8 h条件下制得的微胶囊较好。在该条件下包埋率可达到64.2%,其中黄酮含量51.396 mg/g。用制得的微胶囊与纯化黄酮、BHT应用于油脂抗氧化,结果黄酮微胶囊抗氧化性最好,表现出缓释性。本研究结果为后续黄酮的应用提供了方向。     

微胶囊化硫酸亚铁的研究

以黄原胶、阿拉伯胶、卡拉胶3种多糖为壁材,采用冷冻干燥法对硫酸亚铁进行包埋处理,制成硫酸亚铁微胶囊.探讨和确定测定微胶囊表面铁时清洗表面铁的条件,并研究制备微胶囊时壁材的浓度、芯材与壁材的比例对微胶囊包埋效果的影响.结果确定清洗微胶囊表面铁采用50%乙醇水溶液作为溶剂,处理时间为5 min.壁材浓度对3种微胶囊的包埋率几乎无明显影响,而随着壁材/芯材比例的增加,包埋率明显增加.其中,当以5%黄原胶作壁材,壁材/芯材为30∶1时,包埋率相对较高,可达97%.     

锐孔-凝固浴法制备大蒜油微胶囊的工艺

文章主要研究了锐孔-凝固浴法制备大蒜油微胶囊的工艺过程和方法。试验以大蒜油为芯材,以海藻酸钠为壁材,氯化钙为固化液,探讨了海藻酸钠浓度、芯材与壁材比例、乳化剂浓度、氯化钙浓度及乳化温度等影响成型的主要因素。通过三元二次回归正交实验确定了制备大蒜油微胶囊的最佳工艺条件,并对最佳工艺条件下制备的微胶囊进行包埋率的测定。结果表明:锐孔法制作大蒜油微胶囊的最佳工艺条件为壁材海藻酸钠的浓度为1.4%,芯材大蒜油与壁材的配比为3.8:1,乳化剂的浓度为0.3%,乳化温度为65℃,凝固浴氯化钙的浓度为2%;包埋率可以达到77.21%。     

明胶-阿拉伯胶复凝聚法制备芥末油微胶囊

以明胶和阿拉伯胶为壁材,芥末油为芯材,采用复凝聚法制备球形多核微胶囊。研究壁材浓度、明胶与阿拉伯胶的比例、芯壁比、pH、反应温度和时间等因素对微胶囊成囊的影响。通过实验确定的最佳工艺参数:壁材浓度1%,明胶与阿拉伯胶的比例1∶1,芯壁比1∶1;复凝聚反应pH 3.4,温度40℃,时间20min。在此工艺条件下得到的微胶囊产品的包埋率为92.66%。     

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...     

蚕蛹油不饱和脂肪酸微胶囊的制备及其性质研究

以壳聚糖、乳糖等为壁材,蚕蛹油不饱和脂肪酸为芯材,通过喷雾干燥法制备微胶囊。以微胶囊包埋率为评价指标,采用旋转曲面法设计正交实验,优化微胶囊壁材配比为：脱油大豆卵磷脂添加量为壳聚糖的13%（w/w）,复配壁材乳糖与基础壁材壳聚糖比例为1.42：1.0（w/w）,芯材蚕蛹油不饱和脂肪酸与总壁材质量比0.52：1.0（w/w）,此时微胶囊包埋率达到83.31%,效果达到最佳;蚕蛹油不饱和脂肪酸经微胶囊化后流动性良好,且壁材有效阻隔芯材过氧化,货架期可延长至8个月;模拟胃肠液实验中,被壁材包裹的不饱和脂肪酸在胃液中受到保护缓慢释放,在肠液中可迅速释放。     

明胶/CMC复合凝聚法制备微胶囊研究

以明胶和CMC(羧甲基纤维素钠)为壁材,肉桂醛为芯材,通过复合凝聚法制备球形多核微胶囊.研究明胶/CMC比例、pH、壁材浓度、芯壁比等参数对胶囊形态、粒径及包埋效果的影响.试验确定最佳工艺参数为:明胶/CMC比例9∶1, pH 4.6～4.7,壁材浓度1%,芯壁比2∶1.在此条件下制备的微胶囊球形较好,表面光滑,粒径均一.与明胶/阿拉伯胶制备的微胶囊相比,形态相似,产率较高,而壁材成本大大降低.     

喷雾干燥法制备无花果微胶囊的研究

以阿拉伯胶和麦芽糊精为壁材,以无花果的乙醇提取物为芯材,用喷雾干燥法制取无花果微胶囊粉。通过正交试验分析,确定了最佳生产工艺条件:芯材与壁材的比例为1:4,阿拉伯胶与麦芽糊精的比例为1:1,固形物浓度为30%,乳化剂用量为0.3%,30 MPa均质2遍,进风温度为200℃,出风温度为81℃。生产出的微胶囊无花果粉色泽、溶解性好,水、表面油含量低,无甚粘壁现象,适合于工业化生产。     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications

Microgels are ‘soft’ microscopic cross-linked polymeric particles that are being increasingly exploited in a variety of industries for rheology control, encapsulation and targeted delivery. They are valued because of the ability to tune their functionality to address specific applications in oil recovery, coatings, drug delivery, cosmetics, personal care and foods. Food microgels are typically biopolymer hydrogels in the form of microspheres, nanospheres (also called nanogels), spheroids and fibres. The utilisation of engineered microgels in foods has so far been limited, despite their great potential to address several needs in the food industry, including: satiety control, encapsulation of phytonutrients and prebiotics, texture control for healthier food formulations (e.g. reduced fat products), and targeting delivery to specific areas in the digestive tract. We review the scientific and patent literature on the utilisation and manufacturing methods for producing microgels with an emphasis on micro-hydrogels for food applications.     

12—A CRITIQUE OF SOME HYPOTHESES RELATING TO THE HETEROGENEITY OF THE HIGH-SULPHUR PROTEINS OF WOOL

Joubert and Burns prepared a large number of fractions from the high-sulphur proteins of wool and estimated their molecular weights and amino-acid compositions. Their data have been re-examined in order to look for statistically significant interrelations between amino acids and between the proportion of various amino acids and molecular weight. Statistical analysis of the data is also used to examine the credibility of some hypotheses concerning the mechanism of keratin biosynthesis and to provide further evidence for the existence of families of proteins within the high-sulphur fractions of wool.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

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 Latest Data about Development of Chinese Printing Industry in 2013

In the 2014 China（Shanghai）International Printing Week,Director Wang Yanbin released the latest data about development of Chinese printing industry in 2013.According to statistics,in 2013,the total output value of Chinese printing industry exceeded 1trillion Yuan for the first time,reaching 1.03985 trillion Yuan.There were 105,000 printing enterprises in China,employees were 3.415 million.The total asset was 1.06247 trillion Yuan;     

The State Council Issued "Directory of Government Approved Investment Projects(2013 Edition)"

正On December 2nd,2013,the State Council issued the notification of"Directory of Government Approved Investment Projects(2013 Edition)"(hereafter referred to as"notification").It is pointed out in the"notification"that in order to further deepen reforms in investment systems and administrative examination and approval systems,simplify administrative procedures and delegate powers to lower levels,earnestly     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,     

Top Ten News of China's Paper Industry 2013

On December 24th, 2013, the meeting on the selection of top 10 news of China＇s paper industry 2013 sponsored by 〈China Paper Newsletters〉 was held in Beijing. The yearly selection of the top l0 news, which began in 2000, has become a brand activity widely recognized in the industry thanks to the support from the authorities at all levels and public participation.