保健食品——葛根晶及葛奶的研制

一、葛根的成份和疗效作用葛根含异黄酮成份,葛根素木糖甙、大豆黄酮,异黄酮大豆甙、葛根素及β-谷甾醇、花生酸和大量淀粉。现代药理研究表明,葛根或葛根黄酮能增加脑及冠状动脉血管     

不同种类大豆中大豆异黄酮含量及抗氧化性比较

利用液质联用及串联质谱法对黑豆、黄豆及青豆等8个大豆样品进行了大豆异黄酮分析,结果表明：染料木甙（G）及丙二酰基染料木甙（MG）在8个大豆样品中均为主要的大豆异黄酮组分,两者之和平均占到了大豆异黄酮总含量的50%以上;其次为大豆甙（D）和丙二酰基大豆甙（MD）,两者之和平均占大豆异黄酮总含量的38%左右;黄豆黄甙（GL...     

食盐对腐乳发酵过程中大豆异黄酮构型和含量的影响

本文研究了6%、10%食盐含量的腐乳发酵过程中大豆异黄酮构型和含量的变化.结果表明,食盐含量和β-葡萄糖甙酶活对腐乳发酵过程中大豆异黄酮的构型转化密切相关.酶的活性在毛坯发酵24h后开始快速增长,在腌制2d时达到最高值102.60U/g.6%食盐含量样品中异黄酮糖甙构型转化较快.食盐对染料木酮甙和黄豆甙酶解的影响不同,对染料木酮甙酶解的抑制作用更强.大豆甙在白坯中的含量仅44.86μg/g干物质,在腌制3d后完全分解.     

β-葡萄糖苷酶水解、分离纯化大豆异黄酮甙元工艺研究

研究以低纯度的商品大豆异黄酮为原料,采用β-葡萄糖苷酶水解技术制备高纯度的大豆异黄酮甙元产品.比较系统地研究酶的用量、反应时间、反应温度、反应体系pH值、底物浓度等因素对酶水解效果的影响,最终得到酶水解制备工艺的最佳工艺参数.实验结果表明,采用该分离纯化工艺制备大豆异黄酮甙元产品,其产品得率、异黄酮回收率和产品纯度分别为12.12%、77.16%和92.78%,分离纯化效果比较理想.     

豆粕中大豆异黄酮提取工艺及检测方法优化

以大豆异黄酮6种主要成分大豆甙、黄豆黄甙、染料木甙、大豆甙元、黄豆黄素、染料木素作为对照物,通过单因素实验和正交实验的比较,确定了从脱脂大豆粕中提取大豆异黄酮的最佳条件,为其工业化生产提供了参考依据.提取的最佳条件为乙醇浓度70%,回流提取时间3 h,温度90℃,物料比1:15,提取次数1次.建立了一种同时测定原料中大豆异黄酮6种成分的高效液相色谱法,使常见的大豆异黄酮6种主要成分得以分离和检测.     

河南省滑县粮机厂开发成功专利产品 从豆粕中提取大豆异黄酮成套设备

[本刊讯 ]　最近 ,河南省滑县粮机厂在有关科研单位的协助下 ,成功开发出“从豆粕中提取大豆异黄酮成套设备” ,并于近日通过国家发明专利申请(专利号 :0 2 116 380 4 )。大豆中异黄酮是大豆在生长过程形成的一类次生代谢产物 ,至今已发现大豆异黄酮主要由 12种化合物组成 ,即 9种葡萄糖甙和 3种相应的配糖体。我国大豆品种质量检测表明 ,大豆中异黄酮总含量为 0 0 4 % - 0 5 % ,差异相当大。大豆异黄酮有许多重要的生理活性 ,如抗肿瘤、抗雌激素、抗病原菌、抗氧化、抗溶血等活性 ,尤其是它的抗癌作用 ,近几年国内外研究报道甚多。本发…     

加热预处理对大豆异黄酮含量及组分的影响

通过140℃、40min热处理后大豆胚芽中的异黄酮形式发生改变，通过TLC、HPLC等方法对胚芽提取液中异黄酮组分进行鉴定。结果表明，通过热处理以后，胚芽中主要的异黄酮形式为染料木甙和大豆甙等物质．但总异黄酮含量变化甚微；该实验还研究了提取液经大孔树脂吸附后，25％、40％、55％乙醇洗脱液中异黄酮的主要形式。     

黑龙江省栽培大豆异黄酮含量的初步分析

大豆中含有大豆异黄酮，其主要活性成份为染料木素和大豆甙元。大豆异黄酮是引起大豆苦涩味的主要因子，同时也具有一定的生理活性。利用HPLC对黑龙江省46个主栽大豆品种（系）和6个特用豆品种的大豆异黄酮含量进行分析，筛选出3个高异黄酮含量的主栽品种和2个特用豆品系。并初步分析了遗传差异是影响大豆异黄酮含量的主要因素，同时栽培环境对大豆异黄酮含量也有影响。     

酶辅助亚临界水提取高温豆粕蛋白及其性质研究

本文以高温豆粕为原料,采用β-葡萄糖苷酶辅助亚临界水提取大豆分离蛋白,对提取工艺进行优化,并对产物的理化、结构及抗氧化等性质进行表征。结果表明,高温豆粕在β-葡萄糖苷酶的作用下,糖苷型大豆异黄酮基本转化为生物活性较高的苷元型大豆异黄酮。亚临界水法显著提高了高温豆粕蛋白和大豆异黄酮的溶出率,强化了二者之间的疏水相互作用,获得了一种富集苷元型异黄酮的大豆分离蛋白。鉴于β-葡萄糖苷酶对大豆纤维部分酶解释放较多的还原糖和亚临界水所提供的高温高湿环境,蛋白发生去折叠,表面疏水性显著提高,形成可溶性蛋白聚集体且发生美拉德反应。高温豆粕蛋白中苷元型异黄酮的富集和接枝产物的形成使蛋白表现出良好的DPPH和ABTS自由基清除率。     

β-葡萄糖苷酶以及益生菌生物转化大豆异黄酮糖苷的研究进展

大豆及其加工制品中以糖苷形式存在的大豆异黄酮不利于人体的消化吸收,难以发挥其生物保健作用。本文综述了利用β-葡萄糖苷酶生物转化大豆异黄酮糖苷以提高生物利用率的国内外研究进展情况,重点介绍了外源性β-葡萄糖苷酶和产β-葡萄糖苷酶益生菌对大豆异黄酮糖苷的转化作用。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

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.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

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     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press