添加果酒复合型乳酸菌饮料的研制

将南瓜汁和苹果汁混合发酵的果酒与酸奶进行调配,研制果蔬复合型乳酸菌饮料.通过正交试验得出发酵果汁的最佳工艺为:南瓜汁∶苹果汁=1∶3,酵母菌接种量为8%,发酵天数为3 d,糖度为8 Brix;复合型乳酸菌饮料的最佳工艺为:发酵乳添加量为32.0%,复合发酵果汁8.0%,糖添加量为10.0%,稳定剂添加量(CMC∶黄原胶=2∶1)为0.30%,加酸量(柠檬酸∶果酸∶VC=8∶1∶0.5)为0.14%,均质压力为20 MPa.     

混菌发酵对柿子酒风味的影响研究

该文研究了果酒酵母和安琪干酵母混合发酵对柿子酒风味的影响。正交试验结果表明,蔗糖调节柿子果汁含糖量20°Bx,果酒酵母和安琪干酵母混合菌液接种量为5%(1∶1),添加碳酸氢钠溶液调整pH值为5,在28℃发酵8d,酿制出外观澄清透亮,风味独特,品质稳定的柿子果酒。GC-MS分析表明,混菌发酵制成的柿子酒中乙醇的相对含量高于其他2种酵母单菌发酵制成的柿子酒,高级醇种类及含量均低于其他2种酵母单菌发酵制成的柿子酒;酯类物质种类及含量均高于其他2种柿子酒;混菌发酵对柿子酒风味有明显改善。     

发酵果汁啤酒质量影响因素研究

研究以果汁为原料之一 ,以啤酒酵母为菌种 ,通过低温发酵制作果汁啤酒。从质量影响因素出发进行研究表明 ,麦芽汁 :果汁以 6∶1混合发酵较好 ,最终产品酒精度 3% (V/V) ,糖度 5 5°Bx,pH值 4 4,可获得令人满意的口感     

柑橘苹果复合酒发酵工艺的研究

研究了柑橘苹果复合果酒发酵工艺条件。采用2种工艺技术:即单一果汁发酵工艺和复合果汁发酵工艺。将采用这2种发酵工艺制成的复合果酒,进行感官评定,结果表明,采用单一果汁发酵工艺制取的复合果酒,以V(柑橘原酒)∶V(苹果原酒)=1∶2的配比进行复合效果最好;采用复合果汁发酵工艺制取的复合果酒,以V(柑橘汁)∶V(苹果汁)=2∶1的配比效果最好。2种工艺相比较,以复合果汁发酵工艺制取的复合果酒质量较好。     

发酵果汁啤酒质量影响因素研究

以果汁为原料之一,以啤酒酵母为菌种,通过低温发酵制作果汁啤酒。从质量影响因素出发进行研究表明,麦芽汁:果汁以6∶1混合发酵较好,最终产品酒精度3%(V/V),糖度5.50BX,pH值4.4,可获得令人满意的口感。     

紫薯黄冠梨复合果酒酿制工艺研究

以紫薯、黄冠梨为主要原料,经淀粉酶液化,果胶酶和糖化酶糖化,添加白砂糖,经酵母菌发酵,制得紫薯梨复合果酒,采用单因素实验和正交试验优化制备工艺。结果表明,淀粉酶对紫薯液化过程的最佳条件为酶添加量0.12%,酶解pH值6.0,酶解温度50℃,酶解时间30 min,此时出汁率为68.00%。果胶酶、糖化酶对混合果汁酶解过程的最佳条件为酶添加量0.10%,酶解pH值4.0,酶解温度50℃,酶解时间90 min,此时混合果汁的出汁率为70.65%,最优配方及发酵工艺条件为:物料比1∶5,紫薯∶梨为1∶1,酵母添加量4%,白砂糖添加量15%,28℃发酵5天,制得紫薯梨复合果酒,测得复合果酒的酒精度为12.8%。     

发芽糙米复合果醋饮料混种发酵生产工艺研究

对发芽糙米复合果蔬醋饮料(苹果、番茄和胡萝卜)工艺进行研究,试验结果表明,发芽糙米混合果蔬果醋酒精发酵的最佳条件:复合果汁添加量为10%。比例为1∶1∶1、发芽糙米粉的添加量为6%,混种比例As2.346∶As2.339∶乳酸菌为3∶3∶1,混种添加量为0.20%,28℃下发酵6天;醋酸发酵最佳条件:As1.41接种量为11%、初始酒精度为5.0%、醋酸发酵温度为33℃、醋酸发酵时间为6天。以12%~13%酿制果醋、加入1.5%~2%的蜂蜜、0.2%的甜蜜素以及0.5%的食盐配制果醋饮料,产品酸甜味适中,清凉爽口,柔和,具有复合果蔬特有香味。酸度为1.6%,感官评分为92分,各项指标符合果醋质量标准。     

发酵型乳清沙棘饮料的研制

以经过蛋白澄清的乳清作为底物,采用混合乳酸菌对其进行发酵,并利用发酵乳清与沙棘汁调配制成发酵型沙棘汁乳清饮料。试验中,通过正交试验确定了混合发酵剂对乳清发酵的最佳条件为:嗜热链球菌与保加利亚杆菌比例1∶2,接种量4%,发酵温度38℃。在该条件下发酵4h,pH达到4.96,酸度达到26.8°T,乳糖含量为6.81%。同时,通过正交试验确定了对产品品质影响最大的沙棘汁、蔗糖和稳定剂的添加量,得到发酵型沙棘汁乳清饮料的最佳配方为沙棘汁7.5%、蔗糖6%、稳定剂0.3%。     

香蕉西番莲果醋发酵工艺的研究

以新鲜香蕉、西番莲汁为原料,用农职A和农职B酵母为发酵剂进行酒精发酵,酒精发酵结束后进入醋酸发酵,研究要酵温度、醋酸菌接种量、初始酒精浓度、发酵时间对果醋发酵的影响。结果表明,将香蕉-西番莲-水(80∶1∶10)混合果汁的糖度调整为20%,加入A、B(1∶1)混合酵母1.6×106cfu/mL,在24℃发酵至酒精度为7%,接入5%的醋酸菌种,在温度为32℃发酵9d,可得到色泽淡黄色;果香浓郁,醋香纯正;酸甜柔和,爽口,无异味;澄清透明的香蕉-西番莲果醋。     

薏米黑豆复合发酵饮料的研制

对薏米黑豆复合发酵饮料进行研制。以薏米、黑豆为主要原料,采用纳豆芽孢杆菌进行发酵,以感官评分和纳豆激酶活性作为评价指标,通过单因素试验和正交试验确定薏米黑豆复合发酵饮料的最佳配方。结果表明:薏米浆和黑豆浆的添加比例为1∶2,纳豆菌接种量为4%,添加白砂糖8%,柠檬酸0.10%,β-环糊精0.06%,在此条件下研制出的薏米黑豆复合发酵饮料纳豆激酶活性最高,可达到621.3U/ml,且复合发酵饮料的色泽明亮、均匀,香气浓郁,风味鲜明,口感细腻。为薏米、黑豆的综合利用开辟了新的领域。     

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