中国白酒不同香型理化指标对比分析

不同香型白酒产品特性的对比分析,对各香型的鉴别和相互借鉴具有重要的意义.本研究以此为目的,基于GSB 11-2260-2008中国名特白酒汇粹国家标准样品中公布的标准值,选择总酸、总酯、固形物、杂醇油、甲醇等理化指标为研究对象,比较分析了清香型、浓香型、酱香型、米香型、凤香型、兼香型、芝麻香型、董香型、馥郁香型等香型白酒的产品特性.分析结果表明,不同香型白酒的理化特性具有明显的差异,这种差异是不同香型白酒特有风格形成的重要原因之一.     

市售豉香型白酒品质及风味感官分析

目的 探究市售豉香型白酒品质特性,通过理化指标与感官风味评价的总体分析,构建其之间的相互关系。方法 以12种市售豉香型白酒为研究对象,采用高效液相色谱法(highperformanceliquid chromatography, HPLC)结合风味感官评价方法,通过有机酸含量、酒精度、总酸、总酯、酸酯总量、pH及风味感官特性等指标综合分析市售豉香型白酒的品质。结果 12种市售豉香型白酒中均检测出乳酸和乙酸2种有机酸,并未检测出草酸和柠檬酸;相比于浓香、清香等白酒,豉香型白酒中苹果酸和酒石酸含量较低; 12种市售豉香型白酒属于平均为29.8%vol的低度酒,总酸和总酯含量平均分别为0.54 g/L和0.53 g/L; 92%的样品酸酯总量不小于8mmol/L,符合一级豉香型白酒的要求;样品的pH都在3.06～4.53内;市售豉香型白酒在水果香、蜜香、米香等风味强度上无显著性差异,而在醇香和脂肪味上具有显著差异。结论 豉香型白酒相关理化指标所代表的风味物质对其风味感官具有一定贡献,研究结果为豉香型白酒理化指标与风味感官存在相互关系,理化指标测定结果对豉香型白酒风味感官评价具有导向作用。     

不同品种的特香型白酒香味成分含量的差异性研究

通过对不同品种的特香型白酒的理化指标、色谱骨架情况进行系统研究分析,明确了不同品种特香型白酒的理化特征。结果表明,不同档次的特香型白酒理化特征有很大的差异性,同一档次的不同酒体的色谱骨架成分呈现出不同的比例特征。     

中国白酒不同香型酒曲理化性能对比分析

选择了26种白酒酒曲为研究对象,以QB/T 4257—2011酿酒大曲通用分析方法为检测方法,检测了水分、酸度、淀粉、发酵力、酯化力、糖化力等理化指标,对比分析了浓香型、芝麻香型、酱香型、清香型、豉香型、特香型等香型白酒酿酒用大曲的特性。结果表明,不同香型的白酒酿造用曲的理化性能各不相同,这与酒曲的类型不同有关,也是不同香型白酒酿造用酒曲特有风格形成的重要原因之一。     

全国兼香型白酒品评与分析

对全国兼香型白酒酒样进行了品评与分析,进一步验证了兼香型白酒行业标准升级为国家标准的理化指标和感官指标的可行性和适应性,分析了兼香型白酒的市场口感特点,以把握市场口感流行趋势,合理调整产品结构.     

关于对中国白酒质量技术标准的思考

在现代科技飞猛发展和白酒市场日趋成熟的今天,中国白酒质量技术标准的研究应与技术进步和科技创新相结合,以不断完善理化、卫生、安全考核指标为研究发展方向.研究修订中国白酒理化指标的考核标准和中国白酒不同香型个性特征的评定标准,加强中国白酒食品卫生、安全性研究,尽快制订和实施年份酒的生产、检测国家标准,进一步强化行业管理和企业自律,不断推动白酒行业技术进步,全面提升中国白酒的品质和安全性,以此促进全行业快速、健康、有序的发展.     

浅析中国白酒的科学指标

从白酒国家标准角度分析了中国白酒的科学指标,从个性分析到共性分析；通过列表方式比较十大香型白酒的理化指标,从安全角度和风味角度作详尽的比较,同时对中国白酒的科学指标作了前瞻性的展望.     

基于仿生学技术对中国十二大香型白酒品质差异的研究

该研究利用电子鼻、电子舌、色度仪等设备对中国十二大香型白酒的香气、滋味和色泽进行测定和分析,比较了不同香型白酒的特性和差异。结果表明,相较于香气指标,不同白酒滋味指标间的差异更大,其中涩味、鲜味、咸味和苦味是差异最大的几种滋味。白酒香气的检测结果显示,老白干香型、特香型、浓香型白酒相较其他香型白酒而言,芳香物质含量相对较高。聚类分析结果显示,凤香型酒香气物质成分与其他11种香型白酒的差异最大。研究结果为不同香型白酒香气、滋味和色泽差异提供了一定的基础数据,这对于后续通过仿生学技术区分不同香型的白酒和确定部分白酒的特征香气成分具有积极的意义。     

关于对中国白酒质量技术标准的思考

在现代科技飞猛发展和白酒市场日趋成熟的今天,中国白酒质量技术标准的研究要与技术进步和科技创新相结合,以不断完善理化、卫生、安全考核指标为研究发展方向。研究修订中国白酒理化指标的考核标准和中国白酒不同香型个性特征的评定标准,加强中国白酒食品卫生、安全性研究,尽快制订和实施年份酒的生产、检测国家标准,进一步强化行业管理和企业自律,不断推动白酒行业技术进步,全面提升中国白酒的品质和安全性,促进全行业快速、健康、有序的发展。     

十二种香型白酒相关研究概况

中国白酒是世界六大蒸馏酒之一,在几千年的发展历程中,因各种生产因素的不同,形成了不同香型的白酒。该文对不同香型白酒的发展及研究概况进行总结,阐明各香型白酒在生产工艺、原料、气候等方面的不同并挖掘其在特征风味成分、功效成分、品质与风格等方面的差异,是白酒研究的重要内容之一。该文列举了各香型白酒的分类、地域分布、各香型白酒之间的相互关系,总结了不同香型白酒的生产工艺、工艺特点、特征风味成分及功能性成分研究概况;探讨了不同香型形成的原因及香型划分的意义,旨在为各香型白酒相互借鉴、融合、彰显特色、提升品质奠定理论基础。     

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