葡萄品种、产区及酿造工艺对酒中白藜芦醇的影响

用高效液相色谱方法研究了葡萄品种、葡萄产区和不同酿造工艺对干红葡萄酒中白藜芦醇含量的影响。结果表明：梅鹿辄葡萄酒中白藜芦醇总量比赤霞珠葡萄酒高30．7％～34％,其中反式白藜芦醇含量显著高于赤霞珠葡萄酒,达到60％～70％;西部宁夏产区的葡萄酒白藜芦醇总量比东部天津蓟县产区的葡萄酒高10．9％;使用佳尼美德发酵罐比立式罐发酵的葡萄酒白藜芦醇总量高4．9％。     

葡萄原料对干红葡萄酒品质及白藜芦醇含量的影响

以宁夏贺兰山东麓、天津蓟县产区、山东蓬莱产区的赤霞珠和梅鹿辄葡萄酿制的干红葡萄酒为试验材料,研究了不同葡萄品种、不同产区、不同年份对干红葡萄酒中白黎芦醇含量的影响。结果表明:在宁夏贺兰山和天津蓟县2个产区,采用同种生产工艺,梅鹿辄干红葡萄酒的白藜芦醇含量高于赤霞珠干红葡萄酒。白黎芦醇总量受年份、产地气候因素的影响较大,对于赤霞珠干红葡萄酒,西部贺兰山产区白黎芦醇的含量明显高于东部蓟县和蓬莱产区。     

赤霞珠干红葡萄酒发酵过程中白藜芦醇含量的变化

本文以宁夏贺兰山东麓产区的赤霞珠葡萄为试验材料,对比分析了酒精发酵期间和苹果酸-乳酸发酵期间葡萄酒中白藜芦醇含量的变化。结果表明:赤霞珠干红葡萄酒中白黎芦醇总量在酒精发酵结束时达到最高(6.41 mg/L),在苹果酸-乳酸发酵中发生部分损失。     

干化葡萄酒酿造中不同干化处理对白藜芦醇的影响

研究以宁夏贺兰山东麓赤霞珠葡萄为原料酿制干化葡萄酒时3种不同干化处理方法(日光下晒制、日光下隔离紫外线晒制、阴制)对葡萄及葡萄酒中白藜芦醇含量的影响,以及干化处理时天气的温度、紫外线强度及葡萄水分损失对白藜芦醇含量的影响。采用高相液相色谱法(HPLC)测定葡萄及葡萄酒中白藜芦醇的含量。结果表明:以未处理的鲜葡萄做对照,3种干化方法都可以提高葡萄以及用它们酿制的葡萄酒中白藜芦醇的含量。相比未处理的鲜葡萄,3种干化方法使葡萄中的白藜芦醇含量分别提高了206.17%、187.65%、138.27%,所酿制的干化葡萄酒中白藜芦醇含量分别提高了139.46%、116.22%、75.30%,干化过程中温度对白藜芦醇含量影响较大,日光下紫外线及葡萄水分含量对白藜芦醇含量影响较小。     

葡萄酒发酵过程中白藜芦醇含量变化的研究

跟踪2005年河北沙城、昌黎、天津蓟县和宁夏御马葡萄产区的干红葡萄酒生产过程,分别采集以赤霞珠葡萄为原料的不同发酵时期的样品,用高效液相色谱检测白藜芦醇含量,研究葡萄酒发酵过程中白藜芦醇含量的变化规律。结果表明,尽管不同产地在发酵过程中生成的白藜芦醇含量有所不同,但都随着果胶酶添加和酵母发酵的进行,白藜芦总醇含量逐渐上升,至主发酵时白藜芦总醇含量达到最高,进入苹果酸-乳酸发酵后,白藜芦醇含量有所下降并维持一定的水平。     

昌黎产区赤霞珠干红葡萄酒的发酵分析

以2005～2007年昌黎产区优质赤霞珠为材料,对酿造干红葡萄酒过程中理化指标进行分析,评价以总糖、总酸、pH值和成熟系数为指标的葡萄质量状况;研究酒精发酵过程中的酒精产量和残糖含量.以及酒精发酵和苹果酸-乳酸发酵对葡萄汁和葡萄酒的总酸、pH值、挥发酸的影响;建立了葡萄酒潜在酒度与葡萄原料总糖之间的数学模型;讨论了昌黎产区赤霞珠葡萄的酒精产率以及葡萄酒总酸和pH值的调整问题.     

不同产区赤霞珠葡萄酒酚类物质特征性分析

目的 探究赤霞珠葡萄酒酚类物质的产区差异性。方法 利用高效液相色谱,分析了新疆天山北麓产区、焉耆盆地产区与山东半岛产区赤霞珠葡萄酒中酚类物质组成与含量,结合多元统计方法进行评价。结果 新疆天山北麓产区、焉耆盆地产区与山东半岛产区赤霞珠葡萄酒的酚类物质含量差异较大,其中新疆两产区的原花青素B1、儿茶素、表儿茶素、对香豆酸、总黄烷醇类、总黄酮醇类、总类黄酮及总酚含量显着高于山东半岛产区(P<0.05),焉耆盆地产区芦丁、槲皮苷、白藜芦醇含量显着高于山东半岛产区(P<0.05)。基于酚类物质的聚类分析结果显示,当欧氏距离超过15时,山东半岛产区样品聚为一类,新疆两个产区葡萄酒样品聚在一起;基于酚类物质的Fisher判别分析能区分山东半岛产区样品,对新疆两个产区个别样品有误判,回代检验与交叉验证合计正确率分别为91.30%和86.96%。结论 新疆天山北麓、焉耆盆地与山东半岛产区赤霞珠葡萄酒酚类物质具有明显的产地差异性。     

单萜烯物质检测方法建立及自选酵母KDLYS9-16对单萜烯产生的影响

采用液液萃取法结合气相色谱氢火焰离子检测器建立一种可同时检测葡萄酒中13种游离态单萜烯类物质的方法,并采用所建方法检测了商品菌SC和自选菌KDLYS9-16两种酿酒酵母发酵的河北省沙城和昌黎2个产区的赤霞珠和美乐葡萄酒中的单萜烯类物质。结果显示,方法的R2为0.996 7~0.999 3,检出限为0.580~1.073 mg/L,相对标准偏差为0.58%~3.18%,回收率为89.98%~107.34%。4种葡萄酒中的单萜烯类物质质量浓度都比发酵前的葡萄汁中高,尤以采用自选高产β-D-葡萄糖苷酶酿酒酵母KDLYS9-16发酵的昌黎产区赤霞珠干红葡萄酒中最高,达到2.855 mg/L,比葡萄汁中增加约3.1倍。赤霞珠葡萄及葡萄酒中单萜烯物质质量浓度比美乐葡萄高,沙城产区的2种葡萄汁中单萜烯类物质质量浓度比昌黎的高,选用不同菌种发酵的葡萄酒中单萜烯物质质量浓度和种类不同。综上,本研究建立方法简单、灵敏性高、重复性好,可用于葡萄及葡萄酒中单萜烯类物质的检测。     

不同过滤方式对红葡萄酒中白藜芦醇含量的影响

本文采用反相高效液相色谱(RP-HPLC)方法同时检测葡萄酒中重要功效成分白藜芦醇及其糖苷的顺反式四种异构体,对比了错流微孔膜过滤(Cross Microflow Filtration,CMF)和硅藻土过滤(kieselguhr Filtration,KF)后红葡萄酒中白藜芦醇含量的变化,发现1)不同品种葡萄酿造的葡萄酒白藜芦醇含量差异很大,赤霞珠葡萄酒中白藜芦醇含量为4.63 mg/L,高于梅鹿辄葡萄酒含量一倍(2.05 mg/L);2)CMF过滤对红葡萄酒中白藜芦醇的保留率达到103.90%,优于硅藻土过滤(保留率为93.08%);3)硅藻土过滤后白藜芦醇反式异构体含量降低,其中反式白藜芦醇糖苷的损失较大,保留率为78.87%.     

葡萄酒中白藜芦醇含量测定及其与环境因子的相关性分析

采用2倍体积乙酸乙酯萃取葡萄酒样并将其浓缩至原酒样体积的1/100,用C18色谱柱,甲醇∶水=5∶5为流动相,可以将白藜芦醇的色谱峰较好的分离出来;以反式白藜芦醇(Sigma)为标样,分别测定了不同产地和品种的葡萄酒样品中的白藜芦醇含量,并分析了葡萄酒中的白藜芦醇含量与各种环境因素的相关性.结果表明,新疆、昌黎、德钦酿酒葡萄产区的赤霞株干红葡萄酒具有较高的白藜芦醇含量;葡萄酒中的白藜芦醇含量与产区的海拔呈显著相关.     

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