降低浓香型曲酒中的乳酸乙酯含量措施

针对浓香型曲酒生产中乳酸乙酯偏高问题提出了１０点解决措施,从而控制了浓香型曲酒中的乳酸乙酯含量。     

降低浓香型曲酒中的乳酸乙酯含量措施浅析

针对浓香型曲酒生产中乳酸乙酯偏高问题提出了十点解决措施，从而控制了浓香型曲酒中的乳酸乙酯含量。     

运用FAD降低浓香型白酒中乳酸乙酯的研究

降低浓香型白酒中乳酸乙酯含量是提高浓香型白酒质量的重要课题，针对这一课题，我们曾在工艺等方面进行过多次“降乳”探讨，但效果均不理想，为了较好的解决这一问题，我们开展了运用FAD降低浓香型白酒中乳酸乙酯含量。试验研究，试验结果表明，“降乳”效果明显，酒质与出酒率均有提高，是“增己降乳”的新途径。     

浓香型白酒与乳酸菌、乳酸、乳酸乙酯

介绍了浓香型白酒生产中乳酸菌的来源、乳酸菌和乳酸降解菌在白酒发酵中的作用及乳酸、乳酸乙酯在白酒中的功能。并建议通过浓香型白酒生产过程中乳酸菌、乳酸、乳酸乙酯的变化等情况来调整生产工艺。     

酱香型酒中的乳酸及乳酸乙酯

开放式操作是白酒的独有的生产方式，在潜入大量的微生物中，乳酸菌分布广、数量多，在窖内发酵，生成大量的乳酸和乳酸乙酯。在不同香型与厂际，乳酸及乳酸乙酯含量相差悬殊，这可能是产品形成不同风格的重要因素。乳酸、乳酸乙酯是白酒香气的重要成分，乳酸菌是白酒生产的重要功能菌。然而在白酒生产过程中，由于管理不善，卫生状况不     

对乳酸乙酯再认识

乳酸是乳酸菌同型发酵的产物,乳酸同乙醇酯化反应生成乳酸乙酯,乳酸乙酯是浓香型酒主体香味成分之一,是白酒中的主要呈味物质,不仅有柔和绵甜的口感,而且对已酸乙酯不家助香作用,在大量浓香型白酒中已酸乙酯与乳酸乙酯的比值多在1：0．5－0．8之间,（孙悟）     

控制凤型酒发酵体系中乳酸的过多生成

分析了凤型酒发酵体系中的过多生成物-乳酸和乳酸乙酯的形成途径及形成原因，阐述了发酵过程中通过强化凤曲管理，遵循装甑蒸酒原则，加强窖池管理，以控制发酵体系中乳酸的积累，有效降低乳酸乙酯的生成量，提高凤型白酒质量。     

降低西凤酒中乳酸乙酯含量的做法

一前言乳酸乙酯为无色液体,香气微弱,味微甜。酒中含有适量乳酸乙酯,可以增加白酒的醇厚感,多则带苦涩味,素有白酒“涩味之王”之称。在大曲白酒的发酵过程中,乳酸菌的代谢作用产生乳酸,进而在酶的催化下,与乙醇生成乳酸乙酯。乳酸菌能使食品发生酸败。在发酵酒醅中若寄生了乳酸菌,就要消耗糖份,进行乳酸发酵,产生大量的乳酸,生成多量的乳酸乙酯。在白酒酿制过程中,即使管理的很好,很干净,但酒中仍会产生少量的乳酸,所以说它是酒精发酵的必然副产物。     

TW80在窖泥中的应用

在窖泥中添加一定量的非离子表面活性剂‘TW80’,然后对窖泥浸提液进行气相色谱分析,窖泥中己酸乙酯、乳酸乙酯含量等均有所增加,比不加‘TW80’的窖泥分别增加了6．6倍和1．8倍。结果表明,添加一定量的‘TW80’是提高浓香型白酒质量的措施之一。     

论浓香型白酒的"增己降乳”

已酸乙酯和乳酸乙酯是浓香型白酒风味物质的主体成分,己、乳比是影响浓香型白酒风味、风格的关键。乳、己比小于１会使酒香浓郁、爽口回甜,但酒中己酸乙酯不低于１．５０ｇ／Ｌ、不超过２．５ｇ／Ｌ,控制乳酸乙酯不超过己酸乙酯的１０％,采取回酒发酵、添加降乳菌或丙酸菌等方法,可实现“增己降乳”措施,可增强浓香型白酒的主体复合香,提高白酒质量。     

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.     

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     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.