野木瓜果酒专用醇备的筛选

野木瓜中富含齐墩果酸,有保护肝脏的作用。饮用野木瓜酿制的果酒可缓解酒精对肝脏的伤害。为选育适合野木瓜果酒发酵的酵母,对野木瓜果实中的天然酵母、安琪葡萄酒活性干酵母、安琪黄酒活性干酵母进行了发酵力、发酵速度等方面的比较筛选。试验结果表明,从野木瓜果实中分离的A2酵母,对野木瓜果酒发酵具有优良的酿造特性,发酵力高,发酵速度快,发酵后的果酒酒体澄清,色泽浅黄,口味协调,香味纯正,是野木瓜果酒酿造的优良天然酵母茵。     

优良猕猴桃酒酵母的筛选

通过微生物检测、理化测定、感官评定和SPME-GC/MS法对12株优良果酒酵母的单位酵母发酵力、发酵速度、所酿猕猴桃酒的理化、感官品质、主要香气物质种类及其含量进行比较研究,筛选出1株优良猕猴桃酒酵母.结果表明,酵母KD的单位酵母发酵力较高,发酵速度平缓,所酿猕猴桃酒澄清、透明,色泽浅黄,酒体醇和爽口,具有猕猴桃果香和纯正的酒香,典型性强;酒度达10.5%vol,VC含量为0.94 g/L,残糖、总酸和挥发酸含量均较低;共鉴定出48种香气物质,占总峰面积的97.33%,其中,酯类物质达19种,相对含量为34.65%,高级醇(5种,15.38%)和脂肪酸(6种,13.30%)含量少,烷烃类和醛酮类等香气物质种类丰富,酒体协调、饱满,是1株适宜猕猴桃酒酿造的优良酵母.     

猕猴桃酒用酵母的选育研究

为选育出猕猴桃酒专用酵母,采用酵母分离和比较发酵的方法,对猕猴桃酒用酵母进行了初步筛选。通过观察菌落特征及镜检细胞形态,筛选出YZ1、YZ2、YZ33株酵母菌。经发酵试验表明,YZ1菌株发酵彻底,产酒精度达9.4%;产酸能力强,达4g/L以上;对SO2的耐受力为30～40mg/L;耐酸性强,发酵醪酸度高,起酵速度快,且发酵酒的香气和风味均优于YZ2和YZ3的发酵酒。因此将YZ1菌株培育驯化后可得到猕猴桃酒专用酵母。     

黄心猕猴桃果酒主发酵工艺参数的优化

‘金艳’黄心猕猴桃是一种具有优良食用品质的猕猴桃新品种,目前鲜有关于黄心猕猴桃酿造果酒的研究报道。本文以四川蒲江地区所产的‘金艳’黄心猕猴桃为原料,探讨了黄心猕猴桃果酒主发酵的最佳工艺条件。采用单因素实验和正交实验,以还原糖、总酸、pH、透光率、酒精度和感官评价等为指标研究了不同的发酵方式、SO₂添加量、酵母接种量以及初始糖度对黄心猕猴桃果酒品质的影响。研究结果表明,以黄心猕猴桃浊汁进行发酵,发酵原汁初始糖度为23°Brix,添加SO₂为80 mg/L,按0.4 g/L接种活性干酵母,发酵5 d结束主发酵,得到发酵原酒的还原糖为8.35 g/L,总酸为13.28 g/L,pH为3.43,透光率高达94.9%,酒精度为9.11（v/v）,酒体澄清透亮,既有原果的清香,又有醇厚的酒香,为猕猴桃深加工产品的开发和生产提供理论依据。      

分离自野生猕猴桃的酿酒酵母A12-2和BL20对猕猴桃酒品质的影响

为明确发酵野生猕猴桃果酒的优势酵母,以猕猴桃为原料,采用前期分离的野生猕猴桃酿酒酵母A12-2、BL20及两种商用酵母为发酵剂,在相同试验条件和工艺下,通过对比前发酵和后发酵过程中猕猴桃酒总酸、酒精度、V_C、挥发性香气成分等理化指标及感官评价得分,分析野生猕猴桃酿酒酵母A12-2、BL20酿造猕猴桃果酒的产品特性。结果表明:与商用酵母相比,野生猕猴桃酿酒酵母A12-2和BL20的发酵能力优于商用酵母,其中,野生猕猴桃酿酒酵母BL20酿造的果酒V_C含量最高、风味最优。野生猕猴桃酿酒酵母BL20酿造的猕猴桃果酒:总酸为18.16 g/L,可溶性固形物为8.5°Brix,V_C含量为95.4 g/L,pH为3.72,酒精度为13.7%vol,所测正己酸乙酯、丁酸乙酯、乙酸丁酯、乳酸乙酯和正己醇含量分别为1.80、28.5、0.25、2.00和1.66 mg/L,感官评价得分为86。初步判定野生猕猴桃酿酒酵母BL20更适于酿造猕猴桃果酒。     

一种猕猴桃果酒专用酵母的高效筛选方法

为探索猕猴桃果酒专用酵母的筛选方法,提高果酒品质,以雅安红阳猕猴桃为原料,从自然糖度（150 g/L）和添加白砂糖达到高糖度（350 g/L）的两组猕猴桃汁发酵液中筛选酵母,对其发酵性能进行测定,并通过微生物质谱检测对其进行菌种鉴定。结果表明,经一级筛选,各分离出3株菌株,编号分别为ZR-1、ZR-2、ZR-3及GT-1、GT-2、GT-3,其中菌株ZR-1及ZR-3被鉴定为柠檬形克勒克酵母（Kloechera apiculate）,其他菌株均被鉴定为酿酒酵母（Saccharomyces cerevisiae）。菌株GT-2发酵力最持久,产酒精力最强,发酵液中酒精度达9.5%vol,且对150 mg/L的SO2和pH=3.0的酸性环境的耐受性最强;菌株GT-1对12%vol酒精耐受性最强,原酒感官评分最高。说明以高糖启动自然发酵,从中筛选酵母简便且准确度高,可作为猕猴桃果酒专用酵母的高效筛选方法。     

优良猕猴桃干酒酵母的筛选

以秦美猕猴桃为原料 ,采用低温酿造工艺 ,对 4种酵母的发酵特性进行了初步研究 ,并通过综合评价 ,筛选出了 1株适合猕猴桃干酒发酵的酵母     

菠萝果酒酿造酵母菌的筛选研究

研究了4株酵母菌在菠萝汁中的生长特征以及发酵过程中的总糖、还原糖、总酸和酒精度等理化指标的变化规律,对菠萝酒进行感官评定,筛选出酿造菠萝果酒的优良菌株.结果表明,4号酵母菌生长繁殖快,发酵性能优良,能耐高酒精和高糖,该酵母菌在菠萝汁中发酵7d后总糖为11.524g/L,还原糖为4.471g/L,总酸为4.75g/L,pH值为4.64,酒精度为18.096%vol,感官评定得分94分.确定4号酵母菌(威尔)是菠萝果酒酿造的优良菌株.     

适用于橘子酒发酵的野生酵母初步筛选

从橘子果肉中分离筛选出酵母菌4株,分别命名为JZ-1、JZ-2、JZ-3、JZ-4。4株酵母均具有典型圆形酵母属特征。经过对4株酵母的发酵力及所酿橘子酒的香气、色泽、风味等感官指标进行综合评价、比较。结果表明,菌株JZ-1发酵速度快,降糖彻底,产酒精能力强,酿造的橘子酒具有较好的橘子果酒的典型性,酒体色度好,为澄清透亮的黄色,酒液酒精度达到9.2%vol,残糖量为10.4 g/L。     

猕猴桃酒的低温酿造研究

本文针对现有猕猴酒产品存在的质量缺陷，从工艺上着手，探讨了提高产品品质的低温酿造法。以低温酿造猕猴桃酒，控制发酵温度在７￣１０℃，所得猕猴桃酒呈天然猕猴桃肉汁色泽，香味带有天然猕猴桃肉汁的清香，完全克服了常温法所酿猕猴桃酒所存在的缺陷。     

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