阳荷红色素的提取及稳定性研究

在单因素试验基础上用正交试验对阳荷红色素的提取工艺条件进行筛选，得出最优提取条件为：在60℃下，用150倍于阳荷粉的pH1的70％乙醇，恒温提取50min。同时研究自然光照、糖类、防腐剂、氧化剂和金属离子对色素稳定性的影响，结果表明，阳荷红色素除在防腐剂苯甲酸钠和山梨酸钾、强氧化剂H2O2及铁离子环境中稳定性较差外，在其他条件下均具有良好的稳定性。     

荔枝核棕色素提取及稳定性研究

对荔枝核棕色素的提取工艺及其稳定性进行了研究,结果表明:以70%乙醇溶剂作为提取剂,料液配比为1∶10,温度为80℃,提取时间为2 h是最佳提取工艺条件;荔枝核棕色素在光照、酸性、温度低于80℃、有还原剂(Na2SO3)的加入下稳定,但在强碱、高温及氧化剂(H2O2)下不稳定。     

黑液预煮KP法蔗渣浆的OOP漂白

对用黑液预煮的两段改良蔗渣KP浆的氧气和H2O2漂白进行了研究。结果表明，使用OP两段漂白，在H2O2用量低于1．2％的条件下白度很难达到80％SBD。而采用OOP三段漂白，在H2O2用量1．0%的条件下，白度可达80．1％SBD，浆的粘度较高(达752mL／g)。在两段氧气漂白中，NaOH用量3％和H2O2用量1．0％时，提高H2O2漂白温度至86℃，可得到80．9％SBD的漂白浆，浆的粘度达782mL/g。研究认为，两段改良KP浆较常规KP浆具有更好的漂白性能，漂白浆的粘度也较高。     

脱墨浆H2O2漂白工艺条件的优化

在浆浓为10％、温度为80℃的条件下，研究了脱墨浆H2O2漂白的几种主要影响因素。研究结果表明：脱墨浆采用H2O2漂白时，其最佳工艺条件为H202用量2％，NaOH用量1．2％，H2O2用量与NaOH用量之比为1：0．6，Na2SiO，用量4．0％，漂白时间1h，助漂剂用量0．5％，在此工艺条件下所得漂白浆白度完全能够满足配抄较高白度新闻纸的需要。     

微波辅助麦草浆HP漂白

研究了麦草浆在微波辐射下的HP两段漂白工艺,探讨了漂白过程中微波功率、处理时间、NaClO及H2O2用量对漂白浆性能的影响.结果表明,漂白的最佳工艺条件H段微波功率320 W,微波处理时间2 min,NaClO用量8%;P段微波功率320 W,微波处理时间1.5 min,H2O2用量1.5%.在最佳漂白条件下,麦草浆白度可以达到80%以上,白度稳定性较好,可降低能耗50%左右.     

金莲花天然色素的提取方法与稳定性研究

对水提取金莲花色素的温度、pH、提取次数进行单因子试验与正交实验；研究了丙酮提取时不同温度和次数的影响；比较了不同的提取方式；探讨了色素的理化稳定性。试验条件下，水提取最佳条件为95℃～100℃下，pH7．0，1次提取30min丙酮宜用54℃水浴，1次浸提；先水后丙酮的提取方式花瓣几近无色，明显优于先酮后水或单一溶剂；常温下、pH3．0—7．0、蔗糖介质中色素稳定，食品加工用盐量、低浓度钙、镁离子对色素影响不大，铁离子、自然强光、H2O2破坏、降解色素。     

刺参体壁超氧化物歧化酶提取及酶学性质的研究

以刺参体壁为原料,提取制备超氧化物歧化酶(SOD),并分析了SOD的pH稳定性,热稳定性,以及H2O2和金属离子对刺参体壁SOD活力的影响,研究结果表明刺参体壁SOD的最佳提取条件为:提取液pH为4.0,浓度50 mmol/L,料液比1:4,提取时间6 h,硫酸铵饱和浓度80%~100%;3%H2O2直接导致SOD活力完全丧失;同时该酶具有较好的耐热性,在酸性条件下SOD具有较好的pH稳定性;Na+、K+、Mg2+、Cu2+对SOD基本无影响;Zn2+、Ca2+对SOD具有激活作用;Fe2+在相同浓度条件引起SOD活力的全部丧失。对刺参体壁SOD的研究,为其生产加工应用、以及丰富刺参自溶机制提供基础的理论依据。     

酸模叶蓼果实红色素的稳定性研究

目的:研究了不同环境条件对酸模叶蓼果实红色素在可见光区的稳定性的影响。方法:采用pH2的80%乙醇作为提取溶剂,对色素提取液在400～700nm进行紫外扫描,而后分别探讨温度、pH、H2O2、VC、金属离子以及蔗糖对色素在紫外和可见光区的稳定性的影响。结果:该色素的四个吸收峰波长分别为444、475、519、665nm;酸模叶蓼果红色素可耐受一定高温,pH对其影响很大,应在低酸性条件下使用;H2O2可使其褪色,VC对其影响不大;大多数金属离子对其无影响,Fe3+等少数金属离子对色素有影响。     

微波辅助提取紫马铃薯花色苷及其稳定性的研究

研究微波辅助提取紫马铃薯花色苷的工艺条件和稳定性。用pH示差法对紫马铃薯中的花色苷含量进行测定。正交实验结果表明:微波辅助提取的优化条件:提取时间40s,微波功率480W,料液比1:70,提取溶剂酸度0.11%盐酸水溶液,提取液花色苷含量达到3.649mg/鲜紫马铃薯(g)。稳定性研究表明紫马铃薯花色苷具有较差的光稳定性和热稳定性,应避免光照和高温;氧化剂H2O2对其稳定性有较大的影响;在酸性条件下稳定性较好;金属离子和常用食品添加剂对紫马铃薯花色苷色素稳定性的影响较小。     

不同黏均分子量壳聚糖制备及在染整中的应用

研究了壳聚糖在中性条件下用H2O2进行氧化降解的情况，讨论了反应温度和H2O2浓度对氧化降解反应的影响。结果表明，用H2O2使壳聚糖在中性条件下氧化降解是制备低分子量壳聚糖的一种简便易行的方法，以分子量为4.5万左右的壳聚糖预处理的棉织物，对活性染料染色增深效果最明显。     

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.     

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.     

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.     

National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the "13~(th) Five-Year Plan"

In Apri Commi major p Plan＂ （h 2014, the National Development and Reform ssion issued an announcement for selection of reliminary research projects for the ＂13th Five-Year ereafter referred to as ＂The Announcement＂）     

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 scientific