利用大孔吸附树脂DA201-C Ⅱ对燕麦蛋白水解液脱盐的研究

采用大孔吸附树脂DA201-C Ⅱ对燕麦蛋白水解液进行脱盐处理是行之有效的方法。静态吸附和解吸实验表明,大孔吸附树脂DA201-C Ⅱ对燕麦肽的吸附性能优于其他七种树脂,其最佳工艺条件为：pH4.0、多肽浓度39mg/ml 的酶解液以1BV/h 的流速上样、1BV/h 的流速水洗、1.5ml/min 的75% 乙醇解吸。在此条件下,大孔吸附树脂DA201-C Ⅱ对水解液的脱盐率为93.4%,燕麦肽的回收率可达72.3%。     

大孔吸附树脂对玉米蛋白水解液脱盐效果的研究

采用大孔吸附树脂DA201-C对玉米蛋白水解液进行脱盐处理,静态吸附和解吸试验表明,大孔吸附树脂DA201-C对玉米多肽吸附性能良好,75%乙醇为较佳解吸剂;动态试验表明,最佳工艺条件:pH=8、样品浓度为30mg/mL玉米蛋白水解液以2BV/h流速上样。该条件下,大孔吸附树脂DA201-C对玉米肽的回收率为79.67%,脱盐率达90.10%。结果表明,用大孔吸附树脂DA201-C对玉米蛋白水解液进行脱盐处理是一种简便有效的方法。     

DA201-C大孔吸附树脂对腐乳多肽脱盐作用的研究

为去除腐乳中的盐分,利于其中活性肽的分离纯化,以腐乳多肽的回收率为指标,采用DA201-C大孔吸附树脂对超滤的水溶性低聚肽的脱盐工艺进行了研究。结果表明:DA201-C大孔吸附树脂对腐乳多肽较佳的脱盐工艺条件为上样浓度45 mg/mL、洗脱流速120 mL/h、解吸剂为70%乙醇。腐乳多肽经DA201-C大孔吸附树脂处理后脱盐率达到98.19%,肽回收率大于90%,抗氧化活性得到提高。利用DA201-C大孔吸附树脂是进行腐乳多肽脱盐处理的一种简便有效方法。     

大孔吸附树脂对草鱼蛋白水解液脱盐的作用

为了脱除草鱼蛋白水解液中的盐,本研究筛选了4 种型号大孔吸附树脂DA201-C、DA201-M、SQT-67和D002,对水解液中草鱼多肽的吸附能力进行测定,并进行静态吸附和解吸实验。结果表明：大孔吸附树脂DA201-C对草鱼多肽的吸附效果较好,其吸附量随草鱼多肽质量浓度的增加而增加;体积分数75%的乙醇对大孔吸附树脂DA201-C的洗脱效果最佳;DA201-C大孔吸附树脂对水解液脱盐的最佳条件为上样流速0.5 BV/h,上样质量浓度为30 mg/mL,水清洗速率为2 BV/h,洗脱采用体积分数75%的乙醇以2 BV/h的流速洗脱,在此条件下大孔吸附树脂DA201-C对水解液的脱盐率达97.17%。     

大孔树脂对罗非鱼皮胶原蛋白抗氧化肽脱盐作用的研究

为了探索罗非鱼皮胶原蛋白抗氧化肽的最佳脱盐工艺,本文采用DA201-C大孔吸附树脂对抗氧化肽进行脱盐试验。结果表明:DA201-C大孔吸附树脂对抗氧化肽的静态吸附率和吸附量分别为82.56%和54 mg/g;动态吸附和解吸最佳的上样浓度为60mg/mL,最佳上样流速为1 mL/min,解吸剂为75%乙醇。抗氧化肽经过DA201-C大孔吸附树脂处理后脱盐率为97.13%,回收率为81.16%,质量浓度为0.245 mg/mL时对ABTS自由基的清除率提高至39.58%。采用DA201-C大孔吸附树脂对罗非鱼皮胶原蛋白抗氧化肽进行脱盐处理是一种简便有效的方法。     

大孔树脂在去除果葡糖浆中糠醛的应用

对颗粒炭、D311大孔吸附树脂和DA201-C大孔吸附树脂去除糠醛效率进行了比较,重点对DA201-C大孔吸附树脂对糠醛吸附性进行优化,确定了最佳工作条件,温度50℃,DS 30%,p H 5.0,流速2 BV/h(BV代表树脂体积)。     

棉籽蛋白源ACE抑制肽的制备过程中脱盐技术的研究

综合比较了001 ×7、201 ×7离子交换树脂、MWCO100透析袋和DA201-C大孔吸附树脂对棉籽蛋白水解液的脱盐效果,分析了DA201-C树脂脱盐对棉籽蛋白水解液ACE抑制活性和氨基酸组成的影响,并对Sephadex G-25分离纯化获得ACE抑制肽各组分进行活性测定.结果表明:DA201-C大孔吸附树脂的脱盐效果最好,控制流速为3 mL/min时,脱盐率可达到94.78％,氮回收率为86.32％,脱盐后疏水性氨基酸得到了有效富集,ACE抑制率显著提高.分离纯化后的ACE抑制肽各组分中,组分Ⅲ的抑制率最高,分子质量小于1000u.     

大孔树脂对酶解大豆肽脱盐效果影响及其最佳条件研究

本文旨在研究不同种类大孔树脂对酶解大豆肽吸附和解吸过程中脱盐效果的影响及其最佳条件。以酶解大豆肽为研究对象,首先以DA201-C、AB-8、D3520、D4006和NAX-Ⅱ5种不同的大孔吸附树脂进行酶解大豆肽的脱盐效果研究,得出DA201-C树脂对酶解液的脱盐效果最好;并对DA201-C树脂进行静态吸附解析工艺的优化并测定其动态吸附解吸实验,得出最佳条件为:pH4.5,酶解液浓度为60mg/mL,75%乙醇洗脱,脱盐率达到93.23%,肽回收率为88.5%。     

大孔树脂对酶解大豆肽脱盐效果影响及其最佳条件研究

本文旨在研究不同种类大孔树脂对酶解大豆肽吸附和解吸过程中脱盐效果的影响及其最佳条件。以酶解大豆肽为研究对象,首先以DA201-C、AB-8、D3520、D4006和NAX-Ⅱ5种不同的大孔吸附树脂进行酶解大豆肽的脱盐效果研究,得出DA201-C树脂对酶解液的脱盐效果最好;并对DA201-C树脂进行静态吸附解析工艺的优化并测定其动态吸附解吸实验,得出最佳条件为:pH4.5,酶解液浓度为60mg/mL,75%乙醇洗脱,脱盐率达到93.23%,肽回收率为88.5%。      

大孔树脂纯化苜蓿叶蛋白肽的工艺优化

通过对比6种大孔树脂对苜蓿叶蛋白肽吸附效果,筛选最佳大孔吸附树脂,并研究其对苜蓿叶蛋白肽的吸附—解吸特性。试验结果表明,纯化苜蓿叶蛋白肽的最适大孔吸附树脂为DA201-C型,最佳工艺条件为:上样流速0.5mL/min,上样浓度10mg/mL,75%乙醇溶液为洗脱剂,洗脱流速0.5mL/min,洗脱体积200mL。在该条件下苜蓿叶蛋白肽含量较最初提高了46.95%,糖含量降低了81.88%,盐和其他杂质含量降低了70.97%。DA201-C型大孔吸附树脂对苜蓿叶蛋白肽有较好的纯化效果。     

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