牦牛血低聚肽抗缺氧活性及其作用机制

研究牦牛血低聚肽的抗缺氧活性及其可能的作用机制。将75只小鼠随机分为缺氧对照组、阳性对照组(红景天组)和牦牛血低聚肽高、中、低剂量组,连续灌胃给药30 d,末次灌胃60 min后,置于常压密闭容量瓶中直到呼吸停止,即刻取出心肌组织和脑组织并测定相关指标。结果表明:牦牛血低聚肽具有良好的抗缺氧活性,能够保护常压密闭缺氧小鼠的大脑及心脏。与对照组相比,高剂量牦牛血低聚肽干预能够极显著降低常压缺氧小鼠脑和心肌组织中丙二醛含量、H2O2含量和乳酸脱氢酶活力(P0.01),显著提高常压缺氧小鼠脑和心肌组织中超氧化物歧化酶活力(P0.01)、谷胱甘肽过氧化物酶活力(心肌组织中P0.01,脑组织中P0.05)、过氧化氢酶活力(P0.01),极显著提高常压缺氧小鼠脑和心肌组织中三磷酸腺苷含量(P0.01)。以上结果表明:牦牛血低聚肽能够缓解缺氧对机体导致的氧化应激损伤,作用机制可能与清除自由基、抑制脂质过氧化、维持机体抗氧化酶系活性及维持线粒体内氧化磷酸化的正常进行有关。     

山稔子黄酮类提取物抗自由基作用及体内抗氧化功能的研究

本实验研究山稔子黄酮类提取物的抗自由基作用及体内抗氧化功能。通过测定小鼠血清SOD、GSH—Px活性和MDA含量的变化，研究山稔子黄酮类提取物的体内抗氧化功能；并通过测定山稔子黄酮类提取物清除羟自由基率和抑制超氧自由基率的实验，证明山稔子黄酮类提取物的体外抗自由基作用。结果表明，山稔子黄酮类提取物可显著增强小鼠血清SOD、GSH。Px活性，降低MDA含量，并可有效地清除羟自由基和超氧自由基。说明山稔子黄酮类提取物具有明显的抗自由基作用及体内抗氧化功能。     

厚朴抗氧化作用研究

分别用ＤＰＰＨ法,硫代巴比妥酸法及Ｎａ２Ｓ２Ｏ３滴定法测定了厚朴提取物的抗氧作用。结果表明：不同溶剂厚朴提取物对ＤＰＰＨ自由基均有清除作用,其中以乙醇提取物清除能力最强。厚朴乙醇提取物对亚油酸、猪油的脂质过氧化有良好的阻断作用,其抗氧化作用随提取物用量的增加而逐渐增强。对猪油的抗氧化作用以６０％乙醇提取的活性最强     

月季花抗氧化作用的研究

分别用 DPPH法、硫代巴比妥酸法、Na2 S2 O3- I2 滴定法测定了月季花提取物的抗氧作用。结果表明 ,不同溶剂的月季花提取物对 DPPH自由基均有一定的清除作用 ,其清除率大小依次为 95 %乙醇、水、6 0 %乙醇、乙酸乙酯提取物。随着月季花提取物浓度的增加 ,对猪油和亚油酸的氧化抑制作用增强 ,其中以 95 %乙醇提取物对猪油的抗氧化作用最强     

油茶肉质果、肉质叶提取液的保健功效

研究油茶肉质果、肉质叶提取液（EFF，EFY）的抗自由基、降血糖和抗癌作用。采用TBA比色法和小鼠红细胞氧化溶血抑制试验测定抗自由基作用；采用四氧嘧啶诱导糖尿病小鼠模型，分别用EFF和EFY灌胃7d测定降血糖作用；利用H22移植性实体瘤的方法研究抗癌作用。EFF具有显著消除体内自由基及抗脂质过氧化作用，与维生素E抗自由基及脂质过氧化效果相同；对实验性糖尿病小鼠血糖有明显的降低作用，接近中药消渴丸的效果；能明显抑制小鼠H22移植性实体瘤的生长，油茶肉质果组的抑瘤率为54．9％，油茶肉质叶组的抑瘤率为30．2％，对动物白细胞、脾指数、胸腺指数无明显影响。EFF和EFY能有效控制糖尿病小鼠的血糖水平，维持正常代谢，对正常血糖小鼠无影响；具有提高SOD活性，清除自由基的作用；对癌症小鼠有显著的抑癌效果，与已报道的20种具有显著抗癌作用的蔬菜相比，油茶肉质果排在第9位，油茶肉质叶排在第15位。     

共轭亚油酸抗缺氧效果及其机制的探讨

为了探讨共轭亚油酸的抗缺氧效果，分别以浓度为1．5％，0．5％，0．1％和0％（对照）的共轭亚油酸给小鼠灌胃，连续10d，在常压缺氧条件下测定小鼠存活时间，并测定小鼠心肌和骨骼肌肌红蛋白含量，结果显示，在浓度为0．5％时，CLA能显著提高小鼠在缺氧条件下的生存时间，并显著提高小鼠心肌和骨骼肌肌红蛋白含量。     

红景天超临界CO_2提取物抗氧化作用研究

对红景天超临界CO_2提取物抗氧化作用进行研究。采用二苯代苦味酰基自由基分析法、邻苯三酚自氧化法、过氧化氢检测法和过氧化值测定法,测定了红景天超临界CO_2提取物对二苯代苦味酰基自由基、超氧阴离子和羟基自由基的清除能力以及对油脂过氧化作用的影响。结果表明:红景天超临界CO_2提取物具有明显清除自由基的能力,对猪油,菜油有较强的抗氧化作用。     

丹参提取物耐缺氧功能及营养化学研究

目的：探讨丹参提取物对小鼠耐常压缺氧功能及其功能营养化学基础。方法：用常压缺氧小鼠模型试验研究提取物耐缺氧活性，对提取物中功能成分和营养素进行测定和比较。结果：丹参提取物能显著延长小鼠耐常压缺氧的存活时间。提取物中含有丰富的耐缺氧功能因了和相关性营养成分，其中，醇提物中丹参酮IIA1.43％、隐丹参酮0．51％、丹参酮10．1％、丹参素2．14％、原儿茶醛0．33％、多糖含量4．6％。每100g提取物中VC、VE和胡萝卜素的含量分别为0．722mg、25．9mg和0．47mg。结论：丹参提取物具有增强模型小鼠耐常压缺氧能力，其中耐缺氧功能因了和相关性营养素含量丰富。提示这些成分是其耐缺氧作用的物质基础。丹参提取物作为功能食品基料具有良好的应用基础。     

决明子茶提取物中黄酮含量的测定及抗自由基活性研究

以水、不同含量乙醇为溶剂,采用超声、回流等方法提取决明子茶中的总黄酮,采用亚硝酸钠-氯化铝法,通过紫外分光光度计在494 nm处测定样品吸收,计算总黄酮含量;采用DPPH法研究提取物抗自由基活性。研究发现超声和回流提取均含有一定量的黄酮,采用水回流提取的含量最低为3.39%,55%醇超声提取的含量最高为6.10%。决明子醇提取物对DPPH自由基有较好的清除作用,55%醇回流提取物自由基清除率为71.90%。     

不同季节角叉菜乙醇提取物的抗氧化活性

本实验分别对同一地点春季和秋季采集的角叉菜样品采用95%乙醇进行提取.采用化学方法产生超氧阴离子自由基、羟自由基和小鼠肝匀浆液脂质过氧化体系对提取物进行抗氧化活性检测,研究其清除自由基和抑制脂质过氧化能力的差异.结果表明:春秋季节角叉菜样品的乙醇提取物对超氧阴离子自由基、羟自由基具有较显著的清除作用,同时对小鼠肝匀浆液的脂质过氧化作用也有一定的抑制作用.     

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