用天然乳酸钠延长肉制品的货架期

<正> 经美国学者研究表明,所有的瘦肉及禽类制品,以及肉禽香肠和其他糜类制品,一旦在配方中添加天然乳酸钠,其货架期和风味特性均获延长和增强.在腌制液和斩拌料中作为液体配料,其利用率最佳(有效浓度60%).乳酸及其盐类均在许多制品中作为食品配料.这主要是由于它具有风味增强作用、防腐特性以及呈液态的性质,并且它又属于许多食品中的成分之一.天然乳酸钠是天然乳酸(肌肉组织所含成分)的中性盐,它对肉制品及家禽制品的PH、色译或持水性不会产生任何不良影响.     

绿茶的功能成分及超微绿茶粉在饲料中的应用

随着近代科学的发展,茶叶中含有的营养成分和药用成分不断被发现,并通过动物试验和临床试验证实了其保健功能.在饲料工业中作为抗氧化剂、杀菌抗病毒剂、降脂剂、肉质风味剂、除臭解毒剂及免疫增强剂等正逐渐被人们广泛认同与接受.介绍了绿茶的主要功能成分的结构、性质及作用机理,茶叶超微加工技术以及超微绿茶粉在饲料中的应用及其发展趋势,以期对养殖业发展提供参考.     

酵母衍生风味及呈味性

对酵母抽提物、酵母自溶物、风味增强剂的溶出进行了研究,阐明了风味感知,风味增强和协同效应的机理。     

酒精和食品保存

科学技术飞速进展,食品越来越向丰富多样、营养健康、安全方便、保存性好的高水平发展。这样,在坚决扬弃有致癌、致畸、致突变等因子的化学合成添加剂的同时,尤其迫切地探求,发掘于健康有益无害的、既能保持原有的风味特色,又使食品能经一定时间保存而不腐败变质的保存剂。顺应消费者厌恶化学合成剂,追求天然食品、健康食品的意向,近年来对于酒精、有机酸及其盐类等天然物的重新评价并努力探讨最...     

气相色谱法测定苯甲酸的前处理方法改进

苯甲酸及其盐类是常用的食品防腐剂之一。国家规定食品中苯甲酸的标准测定方法是薄层色谱法,样品前处理采用乙醚做提取剂。乙醚是一种沸点很低并具有毒性的有机溶剂,使用中极易挥发,从而污染环境并对人体造成伤害。有关资料在苯甲酸及其盐类的气相色谱测定方法中,选用了石油醚-乙醚混合提取剂,以下实验即在此基础上,对乙醚、石油醚及石油醚-乙醚混合试剂提取苯甲酸及其盐类的回收效果进行分析和比较。     

发酵辣椒的风味调配

通过一系列对比实验分别确定调配发酵辣椒风味所需要的鲜味剂、酸味剂和甜味剂的种类及其比例.通过正交实验,确定发酵辣椒的鲜味剂、酸味剂的最佳配方组合.     

宰后肉成熟过程中的风味变化

介绍宰后肉在成熟过程中风味的变化,分别阐述肌糖原、蛋白质、脂类、核苷酸等几类化合物对肉风味的贡献.生肉很少有香味.并且只具有一种类似血腥的味道,但在宰后肉成熟的过程中所产生的丰富的具有味觉属性的化合物.以及香味的前提物质和风味增强剂对肉的感官性质产生巨大影响.     

影响水解蛋白风味的因素

分析了氨基酸、肽、蛋白质的种类和水争方法、水解程度对水解蛋白风味的影响，介绍了改善水解蛋白风味的措施。     

天然风味增强剂——酵母抽提物

<正> 食品在加工时或加工后,往往需要添加额外的风味增强剂,使其更加美味可口。在亚洲地区,较受欢迎的风味增强剂为谷氨酸钠、5＇-肌苷酸(5＇IMP)和5＇-鸟苷酸(5＇GMP)。此外,肉类和鱼类抽提物、酱油、水解植物蛋白和酵母抽提物(酵母自溶物)     

蒸鱼豉油专用YE产品开发及应用研究

酵母抽提物(Yeast Extract,YE)是一种营养型多功能鲜味剂和风味增强剂,具有鲜味丰富,口感醇厚,天然营养的特点.蒸鱼豉油是蒸鱼特制的酱油,口感和风味是评价其品质的重要指标.文章针对蒸鱼豉油专用YE进行了研究开发,并对其进行应用评价.结果表明:蒸鱼豉油专用型YE能增加蒸鱼豉油产品的厚实口感,协调产品鲜美风味,对蒸鱼豉油产品整体风味的提升具有很好的效果.     

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