板粟深加工中淀粉的酶水解研究

试验对比了BAA中温α-淀粉酶和耐高温α-(Termamyl 120L,S型)对板栗浆液中淀粉的液化效果，选择使用耐高温α-淀粉酶(Termamyl 1120L，S型)为液化板栗淀粉的作用酶，单因素研究确定了液化工艺参数为：料水比1：5，液化温度90℃，pH6．0，酶用量7U／g果肉，液化时间60min。然后采用Novozym^TMAG糖化酶对液化后的板粟淀粉进行糖化，以淀粉水解度(DE值)和糖化液中还原糖的含量(g／100m1)为指标，正交试验表明，在糖化温度60℃，pH4．5，Novozym^TMAG使用量为80U／g果肉的条件下糖化90min，可使水解度(DE值)和糖化液中还原糖含量(g／100m1)分别达到48．9％和4．52g／100ml。     

红薯淀粉糖化条件的研究

对红薯中淀粉的糖化参数进行了研究。确定糖化温度、液化液pH值、糖化时间、用酶量等单因素范围．并进行了正交实验,以淀粉的水解程度（DE值）为指标选出最佳糖化参数。实验结果：最佳参数为糖化温度60℃左右,pH值4．0-4．5,糖化时间以48-60h为宜,用酶量为300U／g淀粉。     

米醋生产用米酒发酵工艺优化

以大米为试验原料,葡萄糖值（DE值）和酒精度为考察指标,研究大米酒精发酵工艺对米醋生产过程的影响。通过正交试验确定大米液化的最佳工艺条件为料水比1∶2.5（g∶mL）,液化酶0.3%,氯化钙0.1%,液化温度97 ℃,液化时间90 min;糖化的最佳工艺条件为糖化酶0.2%,糖化温度65 ℃,糖化时间为60 min;酒精发酵的最佳工艺条件为酵母接种量0.25%,发酵温度33 ℃,发酵时间12 d。在此最佳条件下,最终发酵前醪液的还原糖含量和DE值分别达到19.8 g/100 mL和75.8%,发酵后酒精度达到12.0%vol,出酒率为37.67%。     

益生菌发酵苦荞粉酶解液制备工艺研究

采用中温α-淀粉酶对苦荞麦进行酶解,研究不同酶解时间、加酶量、温度、pH值和料水比等条件下酶解对苦荞粉中的还原糖含量的影响.结果表明:在水解时间2 h,水解温度55℃,加酶量150 U/g,pH值为5.5,料水比1:4(W:V)的条件下对苦荞粉酶解时,酶解后酶解液中的还原糖含量为8.18%,在此条件下苦荞粉酶解液中含有最高的还原糖值.     

双酶法水解米糠淀粉的工艺研究

为了提取米糠淀粉获得葡萄糖作为纳豆芽孢杆菌液态发酵的碳源,采用α-淀粉酶和糖化酶联合水解米糠中的淀粉,在单因素试验的基础上,运用正交试验设计方法对米糠中的淀粉水解工艺进行了研究和优化.结果表明,米糠中淀粉的最佳液化工艺条件为α-淀粉酶添加量16 u/g,温度60℃,CaCl2添加量0.2％,DE值为24.31％;最佳糖化工艺条件为糖化酶添加量200 u/g,温度60℃,pH 4.0,糖化时间6h,最大DE值为98.96％.该工艺使米糠中淀粉的提取率达到了89％,并基本都水解为了还原糖,可作为纳豆芽孢杆菌液态发酵的优质碳源.     

机械活化对木薯淀粉与真菌α-淀粉酶糖化效果的影响

采用搅拌球磨机对木薯淀粉进行机械活化,将不同活化时间的木薯淀粉在相同条件下与真菌α-淀粉酶进行酶解反应．以葡萄糖值为评价指标。分别考察了机械活化时间、糊化温度、糖化时间、底物（淀粉）浓度、酶用量、糖化温度、以及反应体系pH值等因素对糖化液中还原糖含量的影响。结果表明,机械活化预处理能提高木薯淀粉酶解反应液中的还原糖的含量,说明机械活化能有效地提高木薯淀粉的酶解反应活性,酶解速度加快。     

机械活化对木薯淀粉与真菌α-淀粉酶糖化效果的影响

采用搅拌球磨机对木薯淀粉进行机械活化,将不同活化时间的木薯淀粉在相同条件下与真菌α-淀粉酶进行酶解反应．以葡萄糖值为评价指标。分别考察了机械活化时间、糊化温度、糖化时间、底物（淀粉）浓度、酶用量、糖化温度、以及反应体系pH值等因素对糖化液中还原糖含量的影响。结果表明,机械活化预处理能提高木薯淀粉酶解反应液中的还原糖的含量,说明机械活化能有效地提高木薯淀粉的酶解反应活性,酶解速度加快。     

外加酶法酿制低糖啤酒糖化工艺的研究

以普鲁兰酶Ｐｒｏｍｏｚｙｍｅ１２０Ｌ为重点，综合分析了外加酶糖化过程中影响麦汁总还原糖量和糖组成的各种因素，如各酶制剂的用量、糖化温度、料水比、物料比及各因素之间的相互作用等，确定了一套最优的糖化工艺方案。所得麦芽汁浸出率高、色度浅、粘度低、还原糖含量高；经过高效液相色谱分析（ＨＰＬＣ）表明，其糖组成合理；经过十天的发酵，发酵度达８２．２％，酒精分为６．４５５％（Ｗ／Ｗ）。     

酿造苦荞酱油用糖浆的液化和糖化工艺优化

以苦荞碎米为原料对酶法制备苦荞酱油糖浆盐水的液化及糖化工艺进行研究。通过单因素和正交试验,以液化液中还原糖含量和透光率,糖化液中还原糖和总黄酮含量为指标,探讨不同因素对苦荞碎米液化和糖化过程的影响。苦荞碎米的最佳液化条件为:α-淀粉酶添加量50 U/g,料水比1∶9.0(g∶m L),液化温度90℃,液化时间10 min,p H6.5~7.0;最佳糖化工艺条件为:糖化酶添加量250 U/g,糖化温度60℃,糖化时间5 h,p H4。在此工艺条件下,糖化液中还原糖含量为13.70%,总黄酮含量为6.95 mg/g。     

双酶法玉米淀粉糖化反应的影响因素研究

基于双酶法催化玉米中的淀粉水解,并以DE值为分析指标对玉米淀粉糖化反应的影响因素进行研究。通过本试验研究最终得出最佳工艺参数:选取质量浓度为30%的玉米淀粉料液,液化DE值为14%,调节糖化酸度p H为4.8,添加复合糖化酶含量为300 U/g,在58℃的糖化温度下进行处理55 h,得到该条件下最大糖化DE值可达到94%。此研究可为实际生产中玉米淀粉糖化过程提供相关的参数指导。     

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