制膜条件对可食性小麦面筋蛋白膜机械性能的影响

本文探讨了以小麦面筋蛋白为主要原料，制备可食性包装膜时，制膜条件对可食性小麦面筋蛋白膜机械性能的影响．首先，通过单因素试验考察乙醇体积份数、小麦面筋蛋白浓度、成膜溶液的pH、甘油用量及热处理温度等条件对膜性能的影响，并进一步做正交试验，确定了小麦面筋蛋白戍膜的最佳工艺务件：乙醇浓度为50％，小麦面筋蛋白浓度为10％，戍膜溶液的pH为10，甘油用量为4．5ml，热处理温度为80℃。     

可食性包装膜的研制

以小麦面筋蛋白为原料,制备可食性包装膜。首先,通过单因素试验考察小麦面筋蛋白浓度和增塑剂用量、成膜溶剂、成膜溶液的pH及热处理等条件对膜性能的影响,并进一步做正交试验,确定了小麦面筋成膜的最佳工艺条件:小麦面筋-甘油配比为4∶1,乙醇浓度为50%,成膜溶液的pH为11,热处理温度为80℃。     

可食用包装膜的研制

以小麦面筋蛋白为原料，制备可食用包装膜。首先，通过单因素试验考察小麦面筋蛋白浓度和增塑剂用量、成膜溶剂、成膜溶液的pH值及热处理等条件对膜性能的影响。并进一步做正交试验，确定了小麦面筋成膜的最佳工艺条件：小麦面筋和甘油配比为3.5:1，乙醇体积分数为40%，成膜溶液的pH值为3，热处理温度为90℃。     

制膜条件对谷朊粉可食性膜综合性能的影响

研究了制备小麦谷朊粉可食性膜的条件,分析了各种条件对其综合性能的影响,对正交实验结果采用极差分析和综合评分法进行评定,得到制备可食性膜综合性能好的最佳成膜条件为:乙醇体积份数为50%,成膜溶液的pH为10,甘油体积与谷朊粉比值为3/10,热处理温度为80℃。     

小麦谷朊粉制备可食性膜的研究

研究了影响小麦谷朊粉成膜的因素,分析了各因素对其性能的影响,对正交试验结果采用极差分析和综合评分法进行评定,得到制备综合性能好的可食性膜的最佳条件为:乙醇体积分数50%,成膜溶液的pH值10,甘油添加量30%,热处理温度80℃。     

小麦面筋蛋白膜的研制及其耐湿性的改善

以小麦面筋蛋白膜的研制为目的,通过单因素试验和正交试验确定了影响小麦面筋蛋白成膜的主要因素和最佳工艺条件;并进一步通过添加硬脂酸、石蜡来提高膜的耐湿性。结果表明,影响小麦面筋蛋白成膜的主要因素有:成膜溶液的pH、反应温度、乙醇体积分数和反应时间;最佳成膜条件为:pH=3,反应温度90℃,乙醇体积分数40％,反应时间60min。添加石蜡的耐湿性比添加硬脂酸约高10％。制成的蛋白膜具有较好的物理性能。     

可食性小麦面筋蛋白膜耐水性能的研究

本文以小麦面筋蛋白制得的可食性膜为研究对象,通过单因素试验考察乙醇体积分数、甘油用量及石蜡用量等因素对膜的耐水性能的影响,并进一步做正交试验,确定了小麦蛋白膜的耐水性能最佳时各因素的用量:乙醇浓度30%、甘油用量2.5g、石蜡用量0.5g.     

花生分离蛋白可食性膜制备及性能研究

以花生分离蛋白为原料,研究了花生分离蛋白溶液浓度、溶液pH、热处理温度对花生分离蛋白可食性膜膜性能影响,通过正交优化试验确定成膜最佳工艺条件。结果表明,花生分离蛋白可食性膜最佳制备工艺参数为:花生分离蛋白溶液浓度为8%,pH 9.0,热处理温度为75℃。在此条件下,花生分离蛋白可食性膜的抗拉强度、延伸率和水蒸气迁移速率(νWVTR)分别达到1.41MPa,173.87%,23.47 g/(h·m2)。     

花生分离蛋白可食性膜制备及性能研究

以花生分离蛋白为原料,研究了花生分离蛋白溶液浓度、溶液pH、热处理温度对花生分离蛋白可食性膜膜性能影响,通过正交优化试验确定成膜最佳工艺条件。结果表明,花生分离蛋白可食性膜最佳制备工艺参数为:花生分离蛋白溶液浓度为8%,pH 9.0,热处理温度为75℃。在此条件下,花生分离蛋白可食性膜的抗拉强度、延伸率和水蒸气迁移速率(νWVTR)分别达到1.41MPa,173.87%,23.47 g/(h·m2)。     

正交设计法优化大豆分离蛋白膜工艺参数

该文以大豆分离蛋白(SPI)为主要原料,添加甘油制成可食性膜,研究成膜介质和成膜方法对膜性能影响;并比较酸性和碱性条件下可食性膜性能,选择出最佳成膜工艺参数。酸性条件下为:蛋白质与甘油比例为2:1、pH为3、温度80℃、底物浓度8%;碱性条件下为:蛋白质与甘油比例为3:1、pH为10、温度90℃、底物浓度10%。     

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