紫薯-发芽糙米复合饮料的研制

以酶解紫薯汁和发芽糙米汁为原料,添加其它配料,制备紫薯-发芽糙米复合饮料,通过单因素试验和正交试验优化工艺参数。最佳酶解条件为α-淀粉酶用量2.5%、酶解温度65℃和酶解时间60 min;调配的最佳配方为紫薯汁和发芽糙米汁的质量比7∶3、糖用量6%、柠檬酸用量0.010%和羧甲基纤维素钠0.20%,此时得到的复合饮料品质最佳。     

酶法降解玉米芯生产低醇饮料的研究

以玉米芯为原料,利用纤维素酶对其降解生成还原糖,酵母菌利用玉米芯降解物发酵生产低醇饮料。采用正交试验,通过检测降解物中还原糖的含量和对发酵产品进行感官评分确定最佳条件。研究结果表明,纤维素酶降解玉米芯的最佳条件为纤维素酶添加量0.05%、酶解温度35℃、酶解时间42 h、酶解pH4.8,在此条件下可获得还原糖5.232 g/L的降解物。酵母菌发酵玉米芯降解物生产低醇饮料的最佳条件为酵母菌接种量6%、发酵温度28℃、发酵时间48 h,在此条件下发酵制备低醇饮料酒精度为2.7%vol,感官综合评价得分为90分。     

双酶法制备紫薯三七花复合饮料

紫薯中富含硒和花青素,三七花水是云南地区人们常见餐后饮品,该文将两种原料复配制得紫薯三七花复合饮料。通过双酶水解采用均匀试验设计和模糊数学法,对紫薯三七花复合饮料的配方进行优化。结果表明,紫薯汁的最优条件为护色时间5 min、料液比1∶3 (g/mL)、双酶质量比3∶7、酶解温度50℃、酶解时间25 min。紫薯三七花复合饮料的最优配方为紫薯汁添加量200 mL、三七花水50 mL、白砂糖5%、柠檬酸0.05%、黄原胶0.2%、海藻酸钠0.2%,所得到的紫薯三七花复合饮料口感细腻、香气独特、营养价值较高,为酶法制备紫薯类复合饮料提供理论依据。     

紫薯饮料的液化糖化工艺研究

研究了以紫薯为原料制备天然紫薯饮料,通过单因素实验和正交实验确定了紫薯饮料的酶解液化工艺和糖化工艺,得到最优液化工艺为:高温α-淀粉酶加酶量40 U/g、90℃酶解15min;最佳糖化工艺为:葡萄糖淀粉酶加酶量120 U/g、糖化温度64℃、糖化pH4.5、糖化时间3h。此工艺条件下制作的紫薯饮料色泽鲜艳、口感良好、营养丰富。     

树莓紫薯复合果酒发酵工艺研究

本研究基于紫薯糖化液可为树莓发酵果酒提供糖分、紫薯酰基化花色苷可提高果酒花色苷稳定性的特性,以树莓和紫薯为原料,探讨了酶种类、酶添加量、水解时间等因素对紫薯液化糖化液还原糖和总糖含量的影响,以及发酵方式、酵母种类、发酵温度和树莓汁添加量等对复合果酒酒精度、二氧化碳失重、pH值和还原糖、总糖、总酸、花色苷含量等理化指标的影响,比较了复合果酒、树莓酒、紫薯酒贮藏期间花色苷含量的变化。结果表明:紫薯最佳液化、糖化条件:选择耐高温α-淀粉酶,酶添加量为0.9 mL/kg,液化时间为3 h,复合糖化酶添加量为1.2 mL/kg,糖化时间为3.5 h;复合果酒的最佳发酵参数:采用异步糖化发酵,酵母种类为BV818酵母,发酵温度为25℃,树莓汁添加量60%。所得果酒酒精度为11.7%vol,果香、酒香良好,柔和爽口。采用树莓紫薯复合发酵可提高树莓酒贮藏期间花色苷稳定性。     

小米红豆复合米粉酶解工艺

以黄小米和红小豆为主要原料,利用α-淀粉酶对红豆小米复合米粉进行水解,以还原糖含量(DE值)和感官品质为指标,以α-淀粉酶的添加量、底物浓度、酶解温度、酶解时间为单因素变量,分别进行单因素试验和正交试验,确定最佳酶解工艺。结果表明,α-淀粉酶添加量1.2%,底物浓度4%,酶解温度60℃,酶解时间105 min时,红豆小米复合米粉的米浆DE值达到最高,为60.43%,感官评分为89.51分。     

紫薯浆酶法液化条件的优化

以紫薯为原料制成的果酒、果醋等饮料是集营养、保健、食疗等功能为一体的新型饮品。制作这些饮品的过程中,淀粉的液化、糖化是常用到的工序,其中液化效果还关系到糖化的速度和还原糖的得率。本试验针对紫薯液化过程中工艺控制因素问题进行研究,选取一种α-淀粉酶做单因素实验和正交实验。通过对可溶性糖含量进行比较,得出它的最佳液化条件为液化时间60 min,紫薯浆液pH=6,酶添加量55 U·g-1淀粉,水解温度60℃。     

红枣格瓦斯饮料的研制

以红枣汁作为生产格瓦斯饮料原料,提高饮料营养价值,改善饮料的色泽和口味.通过正交试验和感官评定,确定了最佳的生产工艺:酶解的最佳条件为果胶酶的添加量0.6%,酶处理时间8h,酶处理的最适pH值4.0;发酵的最佳条件为红枣汁与麦芽汁比例1:3、发酵时间15h,接种总量3%,发酵温度30℃.     

紫薯浑浊饮料的酶法制备工艺研究

以紫薯为原料,辅以木糖醇、羧甲基纤维素钠等配料开发营养丰富、色泽诱人、体系稳定的紫甘薯浑浊饮料。酶处理工艺可有效改善紫色甘薯饮料的品质。研究表明:漂烫时间1.5min,打浆料液比1/7,40 mg/100 m L的α-淀粉酶水解于pH7.0、65℃条件下酶解紫薯液90 min,可提高紫薯饮料的感官品质;添加5%木糖醇、0.02%羧甲基纤维素钠调配得到品质较优的紫薯浑浊饮料。     

纤维素酶酶解改性玉米粉工艺研究

为探索酶法改性玉米粉技术，得到纤维素酶水解玉米粉的最佳酶解条件，以新鲜玉米粉为原料，研究酶浓度、酶解温度、酶解pH、酶解时间对还原糖含量的影响。通过单因素实验和响应面实验使最适酶解条件更优质，并通过扫描电镜比较微观结构的变化。经研究，纤维素酶酶解玉米粉最适酶解条件为酶解pH 5.31,酶解温度52.04℃,酶解时间4.28 h,纤维素酶浓度0.77%,此条件下还原糖含量为93.605 mg/mL。扫描电镜结果表明，纤维素酶酶解玉米粉，使玉米蛋白质和淀粉结合松散，结构更易于被破坏。该结果可为玉米粉的进一步改性提供基础原料，并对酶法改性玉米粉技术提供理论基础。     

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