富硒猕猴桃发酵果醋生产工艺优化研究

以富硒猕猴桃为原料研制高品质保健饮品——富硒猕猴桃果醋,对其生产工艺条件进行优化研究,确定了最佳发酵、生产工艺条件,分析了果醋中硒的含量。     

蓝莓果醋澄清剂的筛选

以自制蓝莓发酵果醋为原料,采用壳聚糖、硅藻土、果胶酶、明胶、单宁对蓝莓果醋进行一系列单一澄清剂和复合澄清剂的澄清实验,并对透光率、酸度、可溶性固形物含量进行测定。研究结果表明,单一澄清剂中,果胶酶、明胶、单宁澄清效果较为理想,最佳添加量为3%,透光率分别为64.7%、62.0%、61.0%;复合澄清剂中,果胶酶∶明胶∶单宁（8∶1∶1）,添加量5%澄清处理蓝莓果醋,透光率达64.5%。综合澄清稳定性考虑,选择复合澄清剂果胶酶∶明胶∶单宁（8∶1∶1）处理蓝莓果醋效果最佳。成品果香怡人、酒体澄清丰满。     

雪莲果梨果醋澄清工艺的优化研究

以果胶酶为澄清剂对雪莲果梨果醋进行澄清处理,研究了果胶酶用量、酶解pH、酶解温度和酶解时间对雪莲果梨果醋澄清效果的影响,在单因素试验的基础上,采用正交试验对酶用量、酶解pH、酶解温度和酶解时间等工艺参数进行优化,得到最佳工艺条件为:果胶酶用量0.03%、酶解pH 3.5、酶解温度40℃、酶解时间150min,该条件下澄清后果醋透光率为89.3%,澄清效果好。     

温州蜜桔果醋加工工艺优化研究

为开发以温州蜜桔为原料的高品质健康饮品——柑桔果醋,对柑桔果醋的澄清和发酵工艺参数等进行了系统的研究。研究结果表明:20m L/t的4000活力单位的液体果胶酶和0.15%的101澄清剂复合使用,澄清效果明显;最佳发酵工艺条件为:菌种接种量10%,发酵温度32℃,发酵时间72h。     

沙果、猕猴桃复合果醋酿制工艺的研究

以沙果、猕猴桃为原料,利用液体发酵制作复合型果醋,研究了果汁混合比例、酒精发酵条件、醋酸发酵条件及果醋澄清工艺。结果显示:最适工艺条件为沙果汁与猕猴桃汁的比例3∶2;酵母接种量10%、发酵时间5天、温度30℃、糖度8%;醋酸菌接种量8%、发酵时间3天、温度32℃;加入300mg/L果胶酶时复合果醋最为澄清,透光率为90.78%。     

猕猴桃果醋发酵工艺优化及质量分析

以猕猴桃果浆为原料,对果醋的发酵工艺进行优化并对其产品质量进行分析。通过单因素试验探讨复合果胶酶添加量、活性干酵母接种量、发酵醪酒度、醋酸杆菌接种量、醋酸发酵温度与时间对猕猴桃果醋发酵工艺的影响,通过正交试验得出最佳发酵工艺条件,并采用行业标准分析方法对成品的理化、卫生与微生物指标进行检测。结果表明：猕猴桃果浆在添加0.04g/L复合果胶酶并保温45℃处理2.5h后,进行果醋发酵的最佳工艺条件为活性干酵母接种量0.05g/L,发酵醪酒度达6%(V/V)时接入0.07‰(V/V)醋酸杆菌,于30℃发酵5d;在此条件下,成品中的乙酸含量可达6.17g/100mL,其他各项指标均符合相关国家标准的要求。     

不同澄清剂对发酵木瓜酒澄清效果的研究

研究了皂土、壳聚糖、果胶酶澄清发酵木瓜酒的工艺,结果表明,三种澄清剂对发酵木瓜酒均具有不同程度的影响,皂土的澄清效果最佳;通过正交实验确定三种澄清剂的最佳配比为皂土用量1.5%,壳聚糖用量0.1%,果胶酶用量0.15%,在此条件下,透光率可达到98.8%。     

几种澄清剂对“巴伦比”发酵型余甘果酒澄清效果的比较研究

研究了单一澄清剂皂土、果胶酶和和复合澄清剂皂土与果胶酶对"巴伦比"发酵型余甘果酒的澄清效果,并通过正交试验及综合评比分析,结果表明复合澄清剂皂土与果胶酶的澄清效果明显好于单一澄清剂,经皂土与果胶酶处理的"巴伦比"发酵型余甘果酒透光率达99.7%,组成了最佳澄清工艺条件:皂土用量0.8g/L,果胶酶用量0.19g/L,澄清温度20.5℃,澄清时间为120h,澄清后的"巴伦比"发酵型余甘果酒澄清透明,稳定性增加。     

发酵型富硒猕猴桃果醋的研制

以广东云浮郁南县中熟、硒含量为0.077～0.10 mg/kg的优质富硒猕猴桃为原料,加入6.2℃纯水、复配抗氧化剂和纳他霉素充分浸泡50 min;然后捞出;用破碎机将富硒猕猴桃打碎成浆,最后加入冰糖、果胶酶和葡萄酒酵母菌搅拌均匀,于15.7℃进行酶解和发酵,使其最终酒度在9.6%vol;将得到的发酵产物升温至33.2℃～34.4℃后添加食醋曲精和橄榄醋原液进行发酵;当看到液面开始出现菌膜,立刻加入凤梨汁进行控温发酵,测到最终酸度在53 g/L时和最终酒精度在0.44%vol时,即完成醋酸发酵,再经陈酿、调配、过滤、热灌装和灭菌等工序,即得呈棕黄色,具有富硒猕猴桃特有的果香和浓郁的醋香,酸味纯正柔和、口感醇厚、酸甜适口,口味悠长和爽口,稳定性好、富硒猕猴桃果醋饮品。     

果胶酶对百香果醋澄清作用的研究

以果胶酶作为澄清剂对百香果醋进行澄清处理,研究了酶用量、酶解温度和时间对澄清效果的影响.根据果胶酶对百香果醋澄清的单因素试验结果,采用正交试验对果胶酶用量、酶解温度和酶解时间等工艺参数进行优化,确定了适宜的反应条件为:果胶酶用量120mg/kg、温度45℃、反应时间150min.利用果胶酶澄清百香果醋能较好地避免二次混浊现象.     

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