水果多糖的生物活性与应用前景

多糖是水果中一类重要的功能因子,具有多种生物活性.本文介绍了水果多糖的免疫调节、抗肿瘤,抗氧化、抑茵、抗病毒和降血糖等生物活性,并就水果多糖的应用前景与开发利用途径进行了探讨.     

平菇多糖的功能特性及产业开发

平菇多糖是平菇的主要活性成分之一,近年来因其具有抗肿瘤和抗氧化等功能作用成为研究的热点.本文论述了平菇多糖的生物活性的研究进展,并对目前平菇多糖研究中存在的问题及产业开发进行探讨与展望.     

植物多糖的抗肿瘤活性研究进展

植物多糖作为一种具备多种生物活性的天然产物,因其具备高效、低毒等优势成为食品抗肿瘤领域的研究热点。研究发现,植物多糖应用于抗肿瘤临床实验中,有助于解除免疫抑制,增强免疫应答,抑制肿瘤的生长、侵袭及转移。本文主要概括了近10年来国内外抗肿瘤植物多糖的种类,从直接抗肿瘤作用、调控肿瘤微环境、红细胞免疫、铁代谢4个方面阐述了植物多糖的抗肿瘤作用机制,并讨论了植物多糖抗肿瘤的构效关系,对植物多糖抗肿瘤的研究方向进行展望,以期促进植物多糖的深入研究,为抗肿瘤食品的研发提供理论参考。     

植物多糖研究进展

植物多糖普遍存在于自然界植物体中,具有增强免疫力、抗肿瘤、抗衰老等生物活性,而且具有低毒性,因此具有研究价值和广阔的应用前景.由于植物多糖的结构复杂,提取、纯化条件都会对其结构分析和生物活性产生一定的影响,本文从植物多糖提取,纯化、结构分析及生物活性四个方面进行概括和总结.     

米糠多糖的生物活性研究进展

综述了米糠多糖的类型及分离提取工艺,米糠多糖的抗肿瘤活性、免疫增强作用、降血糖活性、抗菌活性等生物活性,米糠多糖的结构分析。     

竹叶提取物竹叶多糖的研究进展

竹叶的食用和药用价值在我国由来已久。最新研究表明,竹叶中含有大量的生物活性多糖和其他活性成分,如黄酮类化合物、特殊的氨基酸和微量元素等等。竹叶多糖是竹叶中重要的生物活性成分,具有抗氧化作用、抗肿瘤、增强免疫、降血糖、抗菌等多种功效。本文主要综述了竹叶多糖的提取工艺、组成成分分析、生物活性等方面的研究现状,并指出目前研究中存在的主要问题,同时展望了竹叶多糖的研究方向,为竹叶多糖的深入研究提供参考。     

西洋参多糖的研究进展

西洋参系五加科人参属植物,具有广泛的生物活性和独特的药理作用,西洋参多糖在免疫调节、抗肿瘤等方面起到重要作用。本文综述西洋参多糖的提取、分离纯化、结构鉴定及其生物活性等方面的研究进展,讨论目前研究中存在的问题,并对其发展前景进行展望。     

活性多糖的生物活性及构效关系研究进展

活性多糖来源广泛,具有免疫调节、抗肿瘤、抗病毒、抗氧化、降血糖等生物活性,且其生物活性与结构密切相关。活性多糖已成为食品科学和医学领域的研究热点之一,也是一类重要的保健食品功能因子。对活性多糖的主要来源、生物活性及主要作用机制、构效关系以及发展前景进行综述,为活性多糖的进一步开发和利用提供理论基础。     

攀枝花黑松露多糖的抗氧化和降血糖活性

多糖作为松露的重要成分之一,具有抗氧化,抗肿瘤和降血糖等多种生物活性.然而,多糖活性与其结构密切相关,但关于攀枝花黑松露中多糖组分的相关结构及其生物活性的研究鲜有报道.该研究采用水提法和Sephadex G-200分离纯化黑松露多糖,并对其结构及体外抗氧化、降血糖活性进行了初步分析.结果表明黑松露多糖的分子质量为1.2...     

多糖化合物的研究进展

多糖作为构成生命活动的基本物质之一,在抗肿瘤、抗炎、抗病毒、降血糖、抗衰老、抗凝血等方面均发挥着其特殊的生物活性作用。该文就多糖的提取分离、纯化、组分分析以及生物活性等方面的研究进行了综述。     

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