黄酒非生物沉淀澄清新工艺技术研究

通过对影响黄酒非生物浑浊的因素和机理的研究,探索黄酒中蛋白质的含量和分子量与黄酒非生物沉淀的相关性,采用食品级D300CE硅胶良好的孔径和巨大的比表面积对黄酒进行处理。结果表明:硅胶D300CE对于吸附引起沉淀物质选择性强,基本上对酒体的呈味物质的含量没有影响,同时能较为完全去除了金属离子特别是铁离子含量,解决了黄酒非生物沉淀的技术问题,提升了酒体的品质。     

关于黄酒非生物性浑浊问题的研究进展

介绍了黄酒浑浊的形成原因,概述了黄酒非生物性浑浊的类型、主要成分分析及其控制措施,分析了不同酒所存在的浑浊问题以期找到解决黄酒非生物性浑浊的方法,综述了黄酒非生物性浑浊的研究进展,并对未来的研究作出展望.     

黄酒中蛋白质沉淀的研究进展

引起黄酒非生物浑浊的因素众多,着重阐述了影响黄酒蛋白质沉淀的因素,同时介绍了解决黄酒非生物浑浊的方法,旨在为黄酒的生产和研究提供一定的参考。     

谈黄酒沉淀与质量

黄酒产生沉淀影响酒的感官质量，引起沉淀的因素有非生物因素和生物因素；黄酒沉淀与固形物应区别对待，两者都会引起黄酒质量的变化，影响酒质。     

黄酒中蛋白质分布及含量与酒质稳定性关系的研究

对多种黄酒中的蛋白质进行分离和检测，研究了黄酒中蛋白质分布及含量与酒质稳定性关系。结果表明：高分子蛋白质在酒中的大量存在必然影响黄酒非生物稳定性，导致浑浊沉淀；黄酒的稳定性与酒中所含的蛋白质总量没有直接因果关系，而与黄酒中存在的某类特定蛋白质相关，此类蛋白质是小分子蛋白质，在一定条件下发生凝聚反应形成各种高分子的蛋白质分布于酒中导致浑浊；寻找一种高选择性吸附剂，并结合冷处理工艺是提高黄酒稳定性、解决黄酒沉淀的策略。     

黄酒非生物混浊的原因及解决办法

黄酒是由5种基本成分和几百种微量化合物组成的胶体溶液。形成黄酒非生物混浊的因素众多。该文介绍了黄酒中非生物混浊沉淀产生的7种原因及解决办法，在酿制好黄酒基础酒的前提下，采用贮存陈化、除浊澄清、冷冻吸附、过滤等，使酒体清亮透明。     

兰陵美酒非生物性浑浊成因及预防对策

黄酒的不稳定性大体上可分成两类 :一是生物性浑浊 ;二是非生物性浑浊。前者可通过彻底杀菌和预防染菌来解决 ;后者至今尚无十分有效的措施。兰陵美酒作为北方黄酒的代表 ,是一种营养丰富的低度发酵酒 ,除含有多种酸、酯、醇、醛等物质外 ,还含有糖份 ,蛋白质 ,氨基酸等含氮化合物 ,糖色、钙、多酚类及氧化酶等物质 ,易受外界因素的影响 ,发生不同程度的生物、物理、化学变化 ,以相应的稳定变得不稳定 ,出现酒体浑浊失光 ,影响了外观和商品价值 ,也影响了兰陵美酒的色香味。本文着重从理论上探讨兰陵美酒非生物浑浊的成因 ,并从工艺上和除浊…     

黄酒中蛋白质分布、含量与酒质稳定性的研究

通过对多种黄酒中的蛋白质进行分离和检测，研究黄酒中蛋白质分布、含量与酒质稳定性的关系。结果表明：①高分子蛋白质可引起黄酒非生物稳定性，产生浑浊沉淀；②黄酒的稳定性与蛋白质总量无直接关系，而与特定蛋白质相关，在低温下易使黄酒产生浑浊、沉淀。     

快速冷冻过滤技术在黄酒生产中的应用研究

为了尽可能的减少黄酒贮存过程中浑浊与沉淀的问题，延长黄酒的货架期，提高饮用舒适度，应用快速冷冻过滤技术对黄酒进行试验，得出黄酒快速冷冻工艺技术参数，原酒酒体温度为12℃，快速冷冻过滤温度为-6℃。快速冷冻过滤后的酒体酒精度、总糖、氨基酸态氮、非糖固形物含量基本没有变化，总酸、高级醇、生物胺等有所下降，一方面延长了酒的货架期，一年以后基本没有沉淀产生，另一方面改善了酒的品质，饮后舒适度大大提高，品质可控，有效节约了能源。     

黄酒浑浊沉淀问题研究进展

黄酒是我国一种古老的、营养丰富的低度发酵酒,其在存放过程中易产生浑浊,甚至沉淀,沉淀物虽然对人体健康无害,但严重影响其外观品质及感官质量。本文从解决问题的角度出发,综述了有关黄酒浑浊沉淀问题的研究进展,着重探讨引起非生物浑浊沉淀的原因及其相应的预防措施,旨在为黄酒的生产和研究提供一定的参考。     

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