超声波辅助法提取锦灯笼宿萼中的木犀草素

以锦灯笼宿萼为原料,优化其木犀草素的超声提取工艺。在单因素试验的基础上,采用正交试验法,考察乙醇浓度、料液比、超声次数、超声时间对锦灯笼宿萼干浸膏中木犀草素含量的影响。结果表明,锦灯笼宿萼中木犀草素的最佳超声提取工艺条件为乙醇浓度75%、料液比1∶20(m∶V)、超声3次、超声时间每次30min,在该条件下干浸膏中木犀草素含量为2.175mg/g。该提取方法具有操作简单、提取时间短等优点,适用于锦灯笼宿萼中木犀草素的提取。     

乌蔹莓中木犀草素的提取工艺研究

确定乌蔹莓中木犀草素的最佳提取工艺.对影响木犀草素提取率的主要因素(乙醇的浓度、提取温度、料液比、提取时间等)进行试验,并通过单因素和正交试验确定最佳提取工艺.最终的提取工艺为最佳的提取工艺条件为:70%乙醇(体积比),料液比为1:14(g/L),提取温度为75℃,提取2次每次提取3h.该提取工艺高效稳定,可用于乌蔹莓中木犀草素的提取.     

花生壳中木犀草素的微波辅助提取工艺研究

研究微波辅助提取花生壳中木犀草素的最佳工艺条件.采用HPLC法测定木犀草素含量,以提取率为指标,应用单因素和正交试验,分别考察微波辅助提取时间、料液比、提取时间等3个因素影响,并将筛选工艺与目前文献的乙醇提工艺进行对比分析.结果表明,微波辅助提取木犀草素的最佳工艺条件:微波时间为2.0min,料液比为1∶6,提取时间为4h.与传统乙醇提取工艺相比,微波辅助提取工艺提取花生壳中木犀草素的提取率提高了4.53倍.     

微波辅助提取樟树叶木脂素工艺优化

通过单因素试验考察料液比、微波时间、微波温度、乙醇浓度对木脂素得率的影响,利用Box-Behnken Design响应面法优化提取工艺。结果表明:微波辅助提取樟叶木脂素的最佳条件为微波时间5min、料液比1∶26(g/mL)、乙醇浓度80%、微波温度60℃,在此条件下实际测得樟叶中木脂素得率为42.69mg/g,回归模型预测得率理论值达42.95 mg/g,实际值比理论值低0.61%,说明了该模型的有效性。     

超声微波协同萃取鸡蛋卵磷脂的工艺优化

采用超声微波协同作用对鸡蛋卵磷脂的提取工艺进行优化,探讨提取时间、乙醇浓度、超声微波功率、料液比4个单因素对卵磷脂得率的影响,通过四因素三水平正交试验设计分析,得出鸡蛋卵磷脂的最佳提取工艺条件为时间40 s、乙醇浓度70%、功率700 W、料液比1∶4(g/mL),此时卵磷脂得率达到7.5%。     

微波法提取紫苏黄酮类物质及其成分分析

研究微波法提取紫苏黄酮类物质的最佳工艺条件。采用单因素及响应面优化试验,分别考察紫苏粒径、提取时间、微波温度、乙醇体积分数及料液比对提取率的影响。结果表明：紫苏粒径20目、提取时间70min、温度71℃、乙醇体积分数61%、料液比1:20(g/mL)时,黄酮得率最高为59.28mg/g。紫苏提取液经柱层析法纯化后,经全波长扫描和高效液相色谱显示,该物质主要成分为芦丁、木犀草素等。     

响应面法优化微波辅助提取艾草黄酮工艺

以艾草为原料,通过单因素试验和响应面试验设计优化微波辅助提取黄酮工艺,分别考察了乙醇浓度、液料比、微波功率、微波时间对黄酮得率的影响。结果表明,最优工艺条件为:乙醇浓度72%、液料比45∶1(g/m L),微波功率520 W,微波时间151 s,在此工艺条件下,艾草黄酮得率为4.37%。     

正交试验法优化超声提取使君子叶总黄酮

采用正交试验法优化超声辅助提取使君子叶总黄酮的工艺条件。以总黄酮得率为指标,考察乙醇浓度、料液比、提取时间对使君子叶总黄酮提取率的影响,利用正交试验法优化最佳提取工艺条件。结果表明,影响使君子叶中总黄酮超声辅助提取效果的主次因素为:料液比乙醇浓度超声时间。最佳提取条件为料液比为1:30,乙醇浓度60%,超声时间40 min。在该条件下,君子叶中的总黄酮的得率为5.47%。     

金银花绿原酸和木犀草苷的提取

为确定金银花中绿原酸和木犀草苷同时提取的最佳工艺条件,以两者得率为指标,在单因素试验的基础上,采用响应面法对主要工艺参数进行优化并得到回归模型。结果表明:回归模型能较好地反映指标与工艺参数之间的关系;最佳工艺条件为提取时间1.25 h,温度71℃,乙醇浓度体积分数60%,料液比1∶25(g∶m L),此条件下绿原酸得率为3.741%,木犀草苷得率为0.067%,与模型预测值相近。     

黄金茶中总黄酮超声提取工艺

对超声法提取黄金茶中总黄酮的工艺进行优化。利用超声法提取黄金茶中的总黄酮,考察了超声时间、超声功率、乙醇浓度、料液比4个因素对总黄酮得率的影响,通过单因素试验和正交试验确定了提取的最佳提取工艺条件。最佳提取工艺为超声时间20min,超声功率75W,乙醇浓度70%,料液比1∶20(g/mL),总黄酮得率为5.3493%。     

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.