南药巴戟天多糖的研究进展

巴戟天是我国著名的四大南药之一,多糖是南药巴戟天的主要功能因子之一,具有多种生理活性。近年来国内外对巴戟天化学成分和药理活性方面的研究进行了大量工作。对巴戟天化学成分及其药理的研究进展已有文献报道,但对巴戟天多糖这一重要活性物质未见有详尽的报道。为了进一步研究和开发利用该植物,对巴戟天多糖成分的药理活性、分离纯化、结构分析、含量等方面的研究进展进行综述。      

香水莲花化学成分和药理活性研究进展

香水莲花(Nymphaea hybrida Peck)是一种兼具食用、药用价值和观赏价值的大型睡莲,含有丰富的植物功能性次生代谢物,其主要为黄酮、多酚、多糖和挥发油类等化学成分.研究表明,香水莲花具有抗氧化、抗衰老、改善记忆和降血脂等方面的药理活性.作者就目前国内外研究文献中对于香水莲花化学成分和药理活性的研究进展进行...     

决明子多糖结构和生物活性功能研究进展

决明子作为一种药食两用资源,含有多种化学成分,多糖作为其主要化学成分之一,近年来受到国内外学者的广泛关注,该文综述决明子多糖提取制备方法、结构特征、生物活性、构效关系及产品开发等方面的最新研究进展,并对决明子多糖活性功能作用机制及其构效关系研究进行归纳。     

巴戟天功能因子研究进展

巴戟天是我国著名的四大南药之一,作为药食同源的中草药品种,将其保健功能因子进行开发,用于保健食品是可行的。本文对巴戟天功能因子的研究进展进行了综述,以期找出一条合理的开发途径,提升其利用价值。     

菠菜中化学成分及药理活性研究进展

菠菜是常见的蔬菜之一,含有丰富的营养成分。研究表明,菠菜中的许多次生代谢产物如黄酮类、酚类、甾体类等有多种生物活性;菠菜中含有少量的生物碱、皂苷、糖类等化学成分。相关药理研究表明,菠菜提取物在抗氧化、抗肿瘤、抗炎、抗高血脂、降糖等方面有良好的效果。通过对菠菜的化学成分和药理活性研究进展进行全面系统的总结,为菠菜更好的研究、开发和利用奠定基础。     

植物多糖抗炎活性机制及其构效关系研究进展

植物多糖是多糖的主要来源之一,具有多种重要的药理活性功能。本文综述了近年来植物多糖在抗炎活性方面的相关研究进展,重点从抗氧化应激、调节细胞因子分泌、调控中性粒细胞、改善肠道菌群和肠黏膜屏障等四个视角阐述了其抗炎机制。进一步分析了植物多糖的平均分子量、单糖组成和糖苷键类型、主链与支链、化学修饰及高级结构与抗炎活性之间的构效关系,最后对植物多糖抗炎活性的研究进行了展望和总结,为其在抗炎药物、食品上的开发应用奠定了理论基础。     

北冬虫夏草多糖组分的分离纯化及结构研究进展

北冬虫夏草多糖是一类具有重要生理和药理活性作用的功能活性成分,是目前研究的热点之一。本文对北冬虫夏草多糖的提取、分离纯化、结构分析方面的最新进展进行了综述,并指出了当前存在的问题和今后发展的趋势。     

北沙参研究进展

山东"道地"药材北沙参在临床治疗中应用广泛,现代研究表明北沙参有诸多化学成分和药理活性。本文结合国内外相关文献,从化学成分、药理作用、质量控制等方面对北沙参的研究进展进行综述,以冀为北沙参的进一步开发利用提供参考。     

发酵巴戟天中多糖和寡糖降血糖作用研究

多糖和寡糖是巴戟天的重要活性成分,对巴戟天的药用功效起着重要影响.该研究以发酵巴戟天为原料,通过探究发酵巴戟天中多糖和寡糖对 α-葡萄糖苷酶和 α-淀粉酶活性的抑制效果,并结合IR-HepG2细胞实验来评价这2种有效成分的降血糖作用.结果表明:发酵巴戟天中的多糖和寡糖单独或复配使用时,都能较好地抑制 α-葡萄糖苷酶和 ...     

板蓝根多糖研究进展

板蓝根为中国传统中药,板蓝根多糖是板蓝根中含量较多的化学成分之一。目前国内外有很多关于板蓝根多糖的研究报道,随着研究的深入,人们也逐渐意识到板蓝根多糖可能是板蓝根生物活性的主要作用因子之一。本文对板蓝根多糖的国内外研究情况进行系统的归纳和总结,分别介绍了板蓝根多糖的提取与纯化方法、分子量、单糖组成、结构、生物活性和板蓝根多糖保健品研究进展情况,希望为板蓝根多糖今后的研究提供一定的借鉴,也相信板蓝根多糖在未来一定有更加广泛的发展和应用空间。      

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