谷朊粉的开发与利用

介绍了谷朊粉的生产方法、化学改性及其在粮食工业、食品工业中的应用情况。预见随着谷朊粉加工工艺的改进和改性工作的开展 ,谷朊粉必将有广阔的应用前景     

谷朊粉的开发与利用

介绍了谷朊粉的生产方法、化学改性及其在粮食工业、食品工业中的应用情况。预见随着谷朊粉加工工艺的改进和改性工作的开展，谷朊粉必将有广阔的应用前景。     

酶法改性谷朊粉对低筋面粉面团及面包加工品质的影响

研究酶法改性谷朊粉对低筋面粉面团及面包加工品质的影响。利用复合蛋白酶水解制备改性谷朊粉,通过扫描电镜观察其超微结构,拉伸仪分别测定未添加谷朊粉、添加未改性谷朊粉、添加改性谷朊粉的面粉面团载荷变形的承受能力,并对制作的面包进行品质评价。结果显示,改性后谷朊粉结构松散,组织边缘不规则,成片状,添加到面粉中能够增加面粉的筋度,在筋度上较改性前有所减小,粉质拉伸特性均未明显降低,具有良好的加工特性。改性谷朊粉用于面包烘焙,能使面包内部蜂窝均匀、质地细腻、香软可口,有助于改善面包的口感。所以改性谷朊粉加大了谷朊粉开发与利用的空间,试验对改性谷朊粉开发的产品而言有重要的借鉴价值。     

谷朊粉的功能特性及改性研究

通过一定方法改性之后的谷朊粉,在食品等工业化生产中有着广泛的应用。本文论述了谷朊粉的化学组成和功能特性,以及近年来对谷朊粉改性的研究进展。     

谷朊粉应用概述

对谷朊粉的加工工艺和应用现状进行了综述.系统介绍了谷朊粉的乳化性和黏弹性等功能特性在食品工业、饲料工业及制造工业等领域的应用,并对谷朊粉的研究方向和开发前景进行了展望.     

谷朊粉研究进展

该文介绍近年来对谷朊粉的化学组成、应用和改性等方面研究进展。谷朊粉特有功能性质在食品生产中具有广泛用途,通过一定生物化学改性,可大大拓宽谷朊粉应用范围,谷朊粉系为值得进一步深入研究和开发利用蛋白质资源。     

谷朊粉可食性膜研究进展

该文介绍了可食性膜分类,并从谷朊粉性质、谷朊粉复合膜研究现状、谷朊粉与其他成膜材料如多糖、蛋白质、脂类复合改性及对谷朊粉和谷朊粉复合膜的化学改性进行了综述,并对谷朊粉膜研究方向进行展望。     

谷朊粉可食性膜研究进展

该文介绍了可食性膜分类,并从谷朊粉性质、谷朊粉复合膜研究现状、谷朊粉与其他成膜材料如多糖、蛋白质、脂类复合改性及对谷朊粉和谷朊粉复合膜的化学改性进行了综述,并对谷朊粉膜研究方向进行展望。     

改性谷朊粉的制备及其凝胶结构分析

先将谷朊粉进行脱脂处理,然后采用微波、三氯氧磷和转谷氨酰胺酶法对谷朊粉进行修饰,并使用电子显微镜扫描分析了不同干燥工艺制备的改性谷朊粉凝胶结构.结果表明:脂肪对改性谷朊粉的凝胶性能影响较小,改性谷朊粉的凝胶临界浓度为16%,冷冻干燥比常压干燥更能明显地保持改性谷朊粉的交联结构.因此,酶法改性结合冷冻干燥是一种制备具有优良凝胶性能改性谷朊粉的先进工艺.     

谷朊粉应用概述

本文对谷朊粉的研究历史，组成和应用进行了综述。较全面的概述了谷朊粉中麦醇溶蛋白、麦谷蛋白的结构和性质，介绍了谷朊粉在工业和非工业领域的应用，提出了谷朊粉研究的方向，同时展望了谷朊粉在工业领域的发展前景。     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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