甘薯微孔淀粉制备技术及吸附性能研究

用淀粉糖化酶、α-淀粉酶、普鲁兰酶水解甘薯淀粉制备一种具有吸附功能微孔淀粉载体。研究表明,淀粉糖化酶对生甘薯淀粉作用力最强;淀粉糖化酶水解制备甘薯微孔淀粉最佳工艺条件是:温度45℃,pH值4,酶用量为1％,时间24小时,水解率为51.52％。微孔淀粉对色素、水溶性维生素、油脂的吸附能力远远高于原淀粉。通过交联反应能明显提高微孔淀粉的结构性能和吸附性能。     

交联微孔木薯淀粉的制备及其性能研究

以木薯淀粉为原料,三氯氧磷为交联剂,糖化酶与α-淀粉酶为复合酶,对交联微孔木薯淀粉的制备及其性能进行了研究.结果表明:交联淀粉乳浓度、交联剂的用量、复合酶用量、缓冲液pH、酶解温度和酶解时间对交联微孔淀粉性能影响较显著.当交联淀粉乳浓度为30％、交联剂用量为80μL、缓冲液pH4.5、复合酶用量2.0％、酶解温度50℃、酶解时间12h时,交联微孔淀粉具有较佳吸水率和吸油能力.通过SEM、XRD和TGA对交联微孔淀粉进行了测定与分析.     

玉米交联微孔淀粉制备工艺的研究

研究了制备玉米交联微孔淀粉的工艺条件,以交联微孔淀粉的吸水、吸油率作为考察指标,通过单因素和正交试验,考察温度、时间、酶用量、酶配比、淀粉乳浓度、pH值对交联微孔淀粉吸水、吸油率的影响,结果确定最佳酶解工艺条件为:温度50℃,时间24h,酶量2.3%,淀粉乳浓度18%,pH值5.0,酶配比1:8,所得交联微孔淀粉的吸水、吸油率分别为163.21%、134.20%。     

几种小红栲变性淀粉的糊化与回生特性

研究了几种小红栲变性淀粉的糊特性、糊化特性和回生特性。结果表明,较之原淀粉（或微孔淀粉）,交联淀粉（或交联微孔淀粉）糊的结构强度明显增强,其抗老化性、抗剪切性、抗酸性和冻融稳定性均有较大提高;小红栲原淀粉、微孔淀粉、交联淀粉和交联微孔淀粉的吸收热焓依次增高,而糊化温度依次增高的顺序则为微孔淀粉、原淀粉、交联微孔淀粉和交联淀粉;糊化后原淀粉、微孔淀粉、交联淀粉和交联微孔淀粉的回生难度依次增加,用Avrami方程能较好地模拟各种小红栲淀粉糊中回生晶体的生长行为。     

交联甘薯淀粉的制备及性质研究

研究了以甘薯淀粉为原料,三偏磷酸钠(STMP)为酯化剂,制备交联甘薯淀粉.通过正交试验考察温度、时间、pH值及三偏磷酸钠用量对交联甘薯淀粉(csps)的结合磷含量的影响,并得出了制取交联甘薯淀粉的最佳工艺条件:反应温度为50℃,反应时间为3h,反应pH值为10.5,STM,添加量为5.5％.与原淀粉相比,交联甘薯淀粉在糊液黏度的稳定性、乳化性及凝沉性等方面均有较大的改善.     

一步和二步改性法对交联酯化甘薯淀粉性质的影响

以三偏磷酸钠(STMP)为交联剂,醋酸酐为酯化剂,对甘薯淀粉进行复合变性,通过一步和二步改性法制备交联酯化改性甘薯淀粉。比较了一步和二步改性法对交联酯化甘薯淀粉性质的影响。一步法指甘薯淀粉交联后调整酯化的条件,省去水洗、中和与干燥操作工序连续进行酯化;二步法为将制备的交联淀粉粉碎干燥后作为酯化变性反应的原淀粉。以峰值粘度和稳定性为指标测定。结果表明:一步法改性的交联酯化甘薯淀粉具有更好的峰值粘度和稳定性;二步法改性的交联酯化甘薯淀粉具有更好的抗凝沉性,溶解度和膨胀度略高于一步法,抗冻融性更好,但与一步法差别不显著。     

食用交联甘薯淀粉制备与性质研究

以甘薯淀粉为原料,三偏磷酸钠为交联剂,对甘薯淀粉进行变性,制备食品用交联甘薯淀粉。以交联淀粉峰值粘度和结合磷含量为指标,以三偏磷酸钠用量、反应pH、温度、时间和硫酸钠用量为因素研究交联反应最优工艺;并研究系列食用交联甘薯淀粉粘度、溶解度、膨胀度、透明度、凝沉性、冻融稳定性等理化性质及形态学和结构性质,为其在食品中应用提供理论依据。     

交联微孔淀粉的制备

淀粉通过交联处理后 ,再进行酶解制得交联微孔淀粉。研究表明 ,最佳工艺条件为 :交联剂用量 0 4μL/ g ,淀粉乳浓度 0 .1～ 0 .2g/mL ,温度 5 0℃ ,pH 4 0 ,酶用量 2 0 % (按淀粉质量计 ) ,反应时间 1 2h。交联后酶解能提高微孔淀粉的结构性能和吸附性能。     

甘薯复合交联淀粉的研究进展

综述了甘薯交联淀粉及甘薯氧化交联淀粉、甘薯酯化交联淀粉和甘薯醚化交联淀粉等甘薯复合交联淀粉的特点和制备工艺的研究进展,探讨甘薯复合交联淀粉在食品工业中的应用,还预测其今后的发展趋势。     

磁性固定化酶技术制备微孔淀粉的工艺优化研究

以甘薯淀粉为原料,研究磁性固定化酶水解制备微孔淀粉工艺,探讨了固定化酶用量、反应时间、反应温度、溶液pH对微孔淀粉吸油率的影响,借助于扫描电子显微镜比较了经游离酶与固定化酶处理后微孔淀粉的孔分布、孔径与孔深。实验结果表明,溶液pH、固定化酶用量对微孔淀粉的制备有较大影响,最佳工艺条件为：固定化酶用量2．0％,反应时间15h,溶液的pH4．5,反应温度35℃,在此工艺条件下,吸油率高达67．52％。在电子扫描显微镜下观察,固定化酶制备的微孔淀粉孔分布均匀,孔径大4、均一,孔深适中,这与实验中固定化酶制备的微孔淀粉吸油率明显提高恰好一致。     

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.