番石榴叶丙酮提取物中酚类物质的提取与鉴定

研究了丙酮提取番石榴叶中多酚类物质的最佳条件：体积分数50%丙酮浸提,浸提温度60 ℃,浸提时间1 h ,原料粒度40目;在该条件下总酚得率为14.54%.利用RP-HPLC鉴定了番石榴叶丙酮提取物中多酚类物质,发现了8种酚类物质：山奈素、绿原酸、没食子酸、原儿茶酸、阿魏酸、咖啡酸、槲皮素和卢丁,其中山奈素、绿原酸、没食子酸在番石榴叶中的存在迄今未见报道.     

金银花中绿原酸醇提工艺的研究

研究了以乙醇水溶液为溶剂提取金银花中绿原酸的最佳工艺.利用正交实验设许考察了提取温度(℃)、浸提时间(min)、液固比(ml/g)、乙醇浓度(%,v/v)4个因素对绿原酸提取率的影响;确定了绿原酸提取最佳工艺:浸提温度65℃、浸提时间20min、液固比为15:1(ml/g)、乙醇浓度为80%,提取率达7.953%,为绿原酸的工业化生产提供参考.     

混合溶剂法从油茶饼粕中提取茶皂素的研究

以95%乙醇-丙酮混合溶剂提取茶皂素,得到了混合溶剂(95%乙醇与丙酮)最佳配比为4:1.在最佳配比下,考察提取时间、温度、液料比对产率和纯度的影响,并采用正交试验进行优化,以产率为指标,得到优化的提取工艺为液料比4:1,浸提时间3.5 h,温度70℃,此时茶皂素产率可达33.3%;以纯度为指标,得到优化的提取工艺为液料比4:1,浸提时间2.5 h,温度60℃,此时茶皂素纯度为97.9%.     

光皮木瓜绿原酸的提取及抗菌活性测定

为提高木瓜的利用价值,首次利用甲醇研究光皮木瓜中绿原酸的最佳提取工艺,在单因素试验基础上,通过正交试验设计考察浸提溶剂体积分数、浸提温度、浸提料液比和浸提时间对绿原酸提取的影响,并初步考察绿原酸样品液对志贺氏痢疾杆菌及金黄色葡萄球菌的抗菌活性。结果表明从木瓜中提取绿原酸的最佳工艺条件为：以85% 甲醇溶液(85:15,V/V)浸提木瓜粉、浸提料液比1:30(g/mL)、浸提温度40℃、浸提时间14h。在该工艺条件下,绿原酸的最高产率可达到0.142%。绿原酸提取液对志贺氏痢疾杆菌和金黄色葡萄球菌具有明显的抗菌活性,表明民间所用的木瓜白酒浸泡液的主要药理活性成分可能为绿原酸。     

金银花中绿原酸提取工艺研究

以金银花为原料,采用醇提水沉法提取绿原酸,考察乙醇深度、料液比、浸提时间和浸提温度对绿原酸提取率的影响。采用正交试验对工艺条件进行了优化研究,结果表明最佳工艺条件为：乙醇浓度60%,料液比1：25,浸提时间60min、浸提温度60℃。在最佳工艺条件下进行提取,提取率为463mg/g.     

微波协同纤维素酶提取玉米须绿原酸工艺优化

利用响应面法对玉米须绿原酸的微波辅助酶提取工艺进行优化。在单因素实验的基础上,以微波时间、乙醇浓度、浸提时间为自变量,绿原酸提取量为响应值,研究各自变量交互作用及其对绿原酸提取量的影响。进一步得到微波协同纤维素酶提取玉米须绿原酸的最佳工艺条件:微波功率240W、微波时间27s、纤维素酶添加量1.4%、乙醇浓度70%、浸提时间1.25h,在此条件下玉米须绿原酸的提取量8.94mg/g。     

茯苓多酚的超声萃取工艺优化及其化学成分分析

使用超声波辅助萃取技术从茯苓中提取茯苓多酚,通过单因素试验考察丙酮浓度、超声浸提温度、超声浸提料液比、超声浸提时间、超声功率对茯苓多酚得率的影响,结合响应面分析法对提取工艺进行了优化,并使用HPLC-VWD对茯苓多酚进行了化学成分分析。结果表明,超声波辅助提取茯苓多酚的最佳工艺参数为:丙酮浓度50%,超声温度47.35℃,超声浸提料液比1∶51.31(g/m L),超声浸提时间90.69 min,超声浸提功率47.06 W,工艺条件下理论得率为58.85 mg/g,实际得率为59.23 mg/g;化学成分分析结果表明,茯苓多酚中含有绿原酸、槲皮素-3-O-葡萄糖醛酸、3,5-二-反式-咖啡酰奎宁酸、3,4-二-反式-咖啡酰奎宁酸及槲皮素。     

枸杞色素提取工艺的研究

利用有机溶剂浸提枸杞子中的色素,通过单因素和正交实验确定了提取枸杞色素的工艺条件为:用石油醚-丙酮(体积比为4∶1)混合溶剂浸提,液料比为3mL∶1g,在50℃浸提1.5h,反复4次,浸提率可达91.6%。     

正交设计优化油橄榄果渣多酚提取工艺

以丙酮为溶剂,采用加热回流提取法,通过单因素试验考察了浸提温度、丙酮浓度、料液比和浸提时间对油橄榄果渣多酚提取率的影响,并在此基础上,通过正交试验设计得到了油橄榄果渣中多酚的最优提取工艺:浸提温度为60℃,丙酮浓度为75%,料液比为1∶13(g/m L),浸提时间为4 h,优选工艺提取的多酚含量为0.244 8%。     

超声波法提取蒲公英中的绿原酸

蒲公英中含有的绿原酸具有抗菌消炎等多种作用,研究并优化超声波提取蒲公英中绿原酸的最佳工艺参数.以蒲公英为原料,通过单因素试验,正交试验和方差分析确定最佳提取工艺.结果表明:超声波提取蒲公英中绿原酸的最佳工艺条件为乙醇浓度60%、pH=2料液比1:14、提取温度50℃、提取时间50 min,绿原酸提取率可达70%以上.     

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.