玫瑰花饮料的研制

以食用玫瑰花为原料,开发营养丰富的玫瑰花饮料,研究玫瑰花饮料的加工工艺。玫瑰花花瓣与白砂糖按质量比1:1比例混合,经过3个月陈化后制成玫瑰糖,进行浸提,得到风味独特的玫瑰萃取液。通过感官评分和正交试验对玫瑰花饮料加工工艺参数进行研究,确定玫瑰花饮料配方及最佳加工工艺。结果表明:玫瑰糖30g,蔗糖5%,柠檬酸0.15%,蜂蜜0.8%,甘草1g的配比得到的玫瑰花饮料品质最佳。     

花青素葡萄复合饮料的工艺研究

以葡萄为主要原料,黑米花青素、白砂糖、柠檬酸和水晶葡萄香精为辅料,研发一款复合型功能饮料。通过单因素实验确定了果胶酶处理葡萄汁的最佳工艺参数,并在此基础上,通过单因素实验和正交试验,得出复合果汁的最佳工艺配方。结果表明,果胶酶提取的最佳提取工艺条件为pH4、温度45℃、果胶酶用量为1.35g/L,处理时间为40min;复合果汁的最佳工艺配方为葡萄汁15%、黑米花青素0.003%、白砂糖7%、柠檬酸0.1%、水晶葡萄香精0.015%。本实验结果将为系列花青素饮料的工业化生产提供理论依据。     

玫瑰花酱制作工艺研究

以玫瑰花瓣为主要原料,通过添加白砂糖、柠檬酸、琼脂粉、单宁酶来制作玫瑰花酱,采用单因素实验与正交试验的方法,确定最佳工艺。结果表明原料最佳配比为:水100 m L,玫瑰花瓣50 g,白砂糖70 g,柠檬酸0.3 g,琼脂0.35 g,单宁酶0.09 g,在此条件下制作出的玫瑰花酱风味最佳。     

玫瑰花浸提条件及玫瑰花饮料工艺的研究

将观赏后的玫瑰花瓣用于浸提,研究了浸提温度、浸提时间、柠檬酸含量、料液比对玫瑰花瓣浸提的影响,确定了最佳浸提条件为:温度90℃、时间60min、柠檬酸0.6%、料液比1∶3。根据上述单因素试验结果进行了3因素3水平的正交试验,筛选出玫瑰花饮料最佳配方为:玫瑰花0.6%柠檬酸浸提液15%、白砂糖9%、柠檬酸0.12%。     

玫瑰花发酵型饮料的研制

以玫瑰花为原料,通过正交试验选择最佳玫瑰发酵方案,确定柠檬酸、白砂糖的配比,以期得到玫瑰花发酵型饮料。结果显示,玫瑰花的最佳发酵工艺是以生啤为菌种来源,糖浓度为6%,接种量为10%,发酵天数为5 d;最佳勾兑方案是0.8%柠檬酸,5%白砂糖,兑水1倍(即1︰1)。根据最佳发酵工艺和最佳勾兑方案,可以得到玫瑰色、均匀透亮、甜味纯正、口感细腻且有浓郁玫瑰香的玫瑰花发酵饮料。     

玫瑰花石榴汁复合饮料加工工艺

以玫瑰花和石榴为主要原料研制复合饮料的加工工艺。玫瑰花与白砂糖以质量比2∶1混合制成玫瑰糖,自然陈化后进行萃取,得到风味独特的玫瑰萃取液。以玫瑰花石榴汁复合饮料的感官评定为指标,通过正交实验进行优化,确定适宜工艺参数为:玫瑰萃取液30 mL,石榴汁60 mL,白砂糖加入量为8%,柠檬酸加入量为0.10%。     

新型玫瑰花酱的研制

以玫瑰花和玫瑰香精为原料,研究新型玫瑰花酱的生产工艺及配方.由单因素试验和正交试验得到玫瑰花酱的最佳工艺参数,并研究了玫瑰香精的最佳添加稀释比例.结果表明:最佳的配方及工艺是玫瑰花(干)3％、白砂糖54％、黄原胶0.2％、、玫瑰香精0.17％、最后加热时间30 min.以此配方工艺制做出的玫瑰花酱口感较好.     

花青素果汁复合保健饮料的工艺研究

以花青素、苹果汁、柠檬酸和白砂糖为原料,开发一种具有抗氧化、预防心脑血管疾病保健作用的花青素果汁复合饮料。首先,以饮料的感官质量为评价指标,采用单因素实验,确定了该饮料的苹果汁、白砂糖、柠檬酸及花青素的添加量。在此基础上,采用四因素三水平L9(34)正交试验,优化了饮料的最佳配方,其结果为:花青素0.04%、白砂糖11%、柠檬酸0.11%、苹果汁4%。     

软糖配方中不同成分对产品质量影响因素的探究

以明胶、白砂糖、85%糖浆、柠檬酸、水蜜桃香精、胭脂红为主要配料,研制出具有较好口感的水蜜桃口味软糖。最佳配方为:明胶18%,白砂糖与85%糖浆配比1:1,柠檬酸1.5%,水蜜桃香精0.1%,胭脂红0.4%。该产品口感独特,风味诱人,并具有良好的咀嚼性和弹性,对明胶类软糖的进一步开发研究具有积极意义。     

低糖玫瑰花酱的研制

以苦水玫瑰为原料加工低糖型玫瑰花酱,在单因素试验的基础上以白糖和麦芽糖的添加量、柠檬酸的添加量、干玫瑰花瓣的量和复配胶配比比例对玫瑰花酱的进行正交试验,得出最佳工艺参数为:干玫瑰花瓣添加量1.5%,白砂糖与麦芽糖添加比例4∶1,黄原胶与琼脂添加比例3∶1,柠檬酸0.24%。采用该方法所制作成的产品其色泽艳丽,玫瑰香气浓郁,口感细腻,且味道酸甜适宜。     

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