魔芋葡甘聚糖的结构、性质及其在食品中的应用

魔芋葡甘聚糖是一种由D-葡萄糖和D-甘露糖通过β-1,4-糖苷键结合而成的天然高分子杂多糖,具有独特的结构、功能及理化性质,其作为一种可溶性膳食纤维在食品工业中有很好的应用前景。魔芋葡甘聚糖由于其具有优良的亲水性、凝胶性、乳化性、成膜作用和增稠作用,在食品中应用广泛。文章就魔芋葡甘聚糖的结构、理化性质、功能特性及其在食品工业中的应用进行了介绍,为魔芋葡甘聚糖在食品工业中的开发利用提供了一定的参考。     

化学改性魔芋葡甘聚糖成膜性能的研究进展

魔芋葡甘聚糖(KonjacGlucomannan,简称KGM),是从魔芋块茎中分离、提取的一种天然复合多糖,具有亲水性、凝胶性、成膜性、抗菌性、可食用性等多种特征,在食品、医药、化工及生物领域应用广泛.简要论述魔芋葡甘聚糖的结构和理化特性,并综合介绍魔芋葡甘聚糖的化学改性研究进展,分析概括化学改性对魔芋葡甘聚糖成膜性能的改善作用.以期为魔芋葡甘聚糖膜的进一步研究提供理论基础,扩大它的应用范围,从而促进魔芋资源的开发.     

魔芋葡甘聚糖基抗菌活性包装膜的研究进展

魔芋葡甘聚糖是一种天然高分子,具有成膜性、生物相容性、可降解和可再生等特性,来源广泛,价格低廉。在众多以魔芋葡甘聚糖为基质的复合材料研究中,魔芋葡甘聚糖基抗菌活性包装膜的研究受到广泛关注,在食品包装领域表现出广阔的应用前景。本文主要从魔芋葡甘聚糖的结构、性能与复合膜的制备方法,以及不同种类魔芋葡甘聚糖基抗菌膜的制备、功能特性、抗菌效果等方面综述了魔芋葡甘聚糖基抗菌活性包装膜的研究进展。     

魔芋葡甘聚糖的功能及在食品领域的应用

魔芋葡甘聚糖是一种优良的水溶性膳食纤维,近年对其功能和应用进行的研究都比较多。该文对魔芋葡甘聚糖的化学结构、生理功能以及在食品领域各个方面的应用进行综述,并对魔芋葡甘聚糖的应用前景作了展望,以期为魔芋葡甘聚糖的后续研究参考。     

魔芋葡甘聚糖基热可逆凝胶研究进展

魔芋葡甘聚糖(KGM)凝胶具有良好的生物降解性、生物相容性,以及环境敏感性、保水性、吸水性、抗菌性等特殊性能,被广泛应用于食品、医药、化工、功能材料领域等。然而,传统魔芋葡甘聚糖凝胶为单一组分凝胶,具有如低内聚性、较弱的机械性能和结构完整性、对加工和环境条件的稳定性不足、外观不可接受、保质期短以及明显的脱水收缩等局限性。魔芋葡甘聚糖基热可逆凝胶是将魔芋葡甘聚糖与其它多糖共混形成的,分子之间通过很强的协同相互作用形成稳定性更好、弹性更高的凝胶。本文从分子组装的角度综述了魔芋葡甘聚糖分别与卡拉胶、琼脂、纤维素衍生物、结冷胶、黄原胶和刺槐豆胶等多糖形成热可逆凝胶的协同增效作用,旨在为改善魔芋葡甘聚糖基热可逆凝胶的强度和体系的稳定性,扩大其应用范围提供参考。     

不同温度处理下魔芋葡甘聚糖膜的制备及其表征

魔芋中含有大量的魔芋葡甘聚糖,魔芋葡甘聚糖具有良好的成膜性,是一种良好的制膜材料,在食品等领域有着广泛的应用。文章以魔芋葡甘聚糖为原材料,将其精粉在4、–18、–80℃的设定温度下分别处理4、8、12、24、48h后,制得魔芋葡甘聚糖薄膜,并进行红外光谱情况分析、XRD曲线分析、流变学分析、拉伸强度和断裂伸长率分析。结果表明:低温处理在一定温度、时间范围内可以提升魔芋葡甘聚糖氢键间的相互作用力,提升黏度、拉伸强度等性能。     

中国魔芋资源研究及其在食品中的应用

中国魔芋资源十分丰富,有２１ 个品种,花魔芋和白魔芋等种葡甘聚糖含量高,经济价值大。魔芋葡甘聚糖加工以“干法”为主,但正向提高纯度、透明度、溶胀速度方向发展。魔芋葡甘聚糖溶胶为假塑性液体,粘度高,并与某些物质协同增稠。在碱性加热条件下可形成热不可逆凝胶;与黄原胶等可协同形成热可逆凝胶。魔芋葡甘聚糖具有降血脂、降血糖、减肥、通便等保健作用。利用上述性质和保健功能,可开发生产多种凝胶类食品或保健食品,添加到其它食品中,提高产品质量。魔芋的开发应用具有较大潜力。     

魔芋葡甘聚糖在酸奶中应用及其研究进展

魔芋葡甘聚糖独特的结构及理化性质使其在食品工业领域具有广泛的应用前景.在酸乳中添加一定量的魔芋葡甘聚糖,不仅可以增强酸乳的黏稠性,保持酸乳的稳定,同时还可以改善酸乳的风味,进一步提高它的保健功能.本文就魔芋葡甘聚糖的结构、理化性质及其在酸奶中的应用进行了综述,并讨论了其在酸奶应用中的一些关注点,以期为魔芋葡甘聚糖在酸奶...     

魔芋营养挂面的工艺研究

魔芋是天南星科草本植物的块茎,我国魔芋资源十分丰富。将魔芋干燥、粉碎后即加工成魔芋精粉,其主要成分为魔芋葡甘聚糖,它是由D-葡萄糖、D-甘露糖按一定比例以b-1,4糖苷键连接起来的高分子多糖。不仅淀粉含量很高,而且内含铁、锌、硒等矿物质和微量元素,尤其是魔芋精粉中的魔芋葡甘聚糖具有消肿、解毒等药用功效。最近研究表明,魔芋葡甘聚糖还对糖尿病、大肠癌有一定的防治作用,并有良好的减肥功效,是低热、低脂保键食品的理想原料。将魔芋精粉加入食盐、大豆粉与普通粉制成的营养型挂面,风味独特、清腻爽口,煮熟后,以蒜泥、香油、酱油制…     

魔芋葡甘聚糖功能特性研究及其在食品工业中的应用

魔芋葡甘聚糖(KGM)是一种天然的优异膳食纤维,本文综述了魔芋葡甘聚糖的功能特性以及魔芋葡甘聚糖在食品工业中的应用概况,并对其发展前景进行了展望。     

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