不同催陈方法对酱香型白酒的催陈效果

该试验采用气相色谱仪（gas chromatography,GC）和液液萃取-气相色谱-质谱（liquid-liquid extraction-gas chromatography-mass spectrometry,LLE-GC-MS）联用技术测定催陈酒样白酒微量组分,结合感官品评及酒精度测定,对比电场催陈、超声催陈、介质吸附催陈和自振空化器催陈4 种催陈方式对新酿白酒催陈的效果。结果表明,活性炭吸附处理和电场处理对新酿白酒风味有较大改善,感官评分优于原酒样。电场处理24 h 为最优催陈处理方式,处理后酒体中酯类物质含量增加7.54%,乙酸乙酯和乳酸乙酯两种主要酯类含量分别增加6.07%和7.18%。     

高压脉冲电场催陈葡萄酒香气成分变化的GC-MS分析

本文通过GC-MS分析，研究了葡萄酒经高压脉冲电场催陈后，其香气成分的变化情况。研究结果表明：经一定条件的高压脉冲电场处理后，葡萄酒中的杂醇油含量有所下降，总酸、总酯和苯乙醇的含量有所上升。与新酒相比，催陈后的葡萄酒陈香明显增加，口感更为醇和，酒体丰满协调。     

物理方法在白兰地和白酒催陈中的研究进展

物理方法以其作用快速,无额外添加物等特点在白兰地和白酒催陈中得到国内外的一定认可,采用物理方法对白兰地和白酒进行催陈,可以改善酒的口感和品质、缩短陈酿周期、提高企业效益。文中重点介绍了电场、超重力场、超声波、微波等物理方法在白兰地和白酒人工陈酿中的作用原理及应用优缺点等方面的研究进展;对物理方法用于白兰地和白酒催陈的作用机理作了总结,并展望了新方法的发展方向和应用前景。      

白酒陈酿机理及催陈技术研究现状

陈酿是白酒生产过程中至关重要的一步,但自然陈酿存在降低生产效率、投资成本增加等问题,因此希望通过人工催陈技术使酒体快速达到陈酿效果。目前物理催陈技术研究较多,这类技术可以降低陈酿时间,提升白酒品质。该文通过对白酒陈酿机理和现有催陈技术两方面进行综述,以期为白酒人工催陈技术研究提供理论参考。     

脂肪酶催陈白酒应用条件对微量成分影响的研究

以脂肪酶Novozym435作为催化剂,探索了应用脂肪酶进行白酒催陈过程不同反应条件对白酒中微量成分的影响。结果表明,Novozym435对不同酒度白酒均有明显的作用,常规作用温度及转速对催陈影响不明显,加酶量对催陈有着较强的影响。     

脂肪酶应用于白酒催陈的初探

白酒催陈过程中最重要且耗时最长的环节是酸酯醇的平衡,利用脂肪酶只改变反应的动力学平衡而不能改变热力学平衡及催化作用特点,拟筛选合适的脂肪酶应用于白酒老熟中,以缩短老熟时间,并对其可行性进行探讨.通过在白酒中添加不同种类的脂肪酶,发现添加Novozym435的酒中,总酯变化幅度较为明显,且作用5h后,酶活保持50%左右.初步证明了脂肪酶应用于白酒催陈中的可能性,提出了一种新的白酒催陈思路.     

超高压技术处理对白酒物理特性和风味的影响

采用超高压技术在不同条件下对新酿白酒进行了处理,研究了压力对白酒电导率、氧化还原电位、总酸含量、表面张力及风味的影响,分析了超高压催陈白酒的效果。结果表明:超高压处理可使新酿白酒的电导率、氧化还原电位、总酸含量、表面张力趋向于陈酒。较低的压力处理对酒的风味有明显改善,过高的压力会破坏酒的风味。在20℃200MPa下处理2h,酒的风味最好。当处理压力高于400MPa时,酒会失去原有的风味。     

白酒的陈酿与催陈—兼介绍一种新的催陈方法

文中对酒的陈酿过程中的各种变化进行了研究，探讨了白酒的人工催陈，提出了一种新的催陈方法。     

低度米香白酒催陈方法对比试验

新蒸馏出来的低度白酒存在口味辛辣,酒液颜色呈白色浑浊状,经过一定时间的陈放,酒液的辛辣感会减少,酒体会变得醇和,也会逐渐变得澄清透亮。传统的自然陈放老熟时间较长,本试验通过自然陈放、超声催陈和釉料粒催陈三种老熟方法对白酒进行催陈,对外观性状、风味和理化指标进行了对比。试验结果表明,釉料粒浸泡催陈30d的米香白酒的外观、风味、理化指标结果显示较好。     

米香型白酒贮酒容器的选择

米香型白酒贮存老熟的质量与贮存容器有着密切的关系,贮存容器种类很多,常用的贮酒容器有陶坛、不锈钢、木箱等,不同的贮存容器贮酒对酒在老熟期的酒质的影响差异很大.陶坛贮酒,对米香型白酒的催陈较好.本公司所产米香型白酒的贮存秉承分级分质的原则,选择陶瓷贮酒容器,起到催陈的作用,后期及成品酒的贮存则用不锈钢罐贮酒.     

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