玉米醇溶蛋白新型提取工艺的研究

本文提供了一条玉米醇溶蛋白生产的新工艺路线，并论述了对提取与回收工艺过程及工艺参数的研究，确定了本工艺最佳工艺条件。最佳提取条件：液固比１４∶１（ｍ１／ｇ），温度５０℃，ｐＨ值９．０，时间２．０ｈ；最佳回收条件：ＮａＣｌ浓度１％，体积比１∶１。     

生活物性肽——酷蛋白磷酸肽（CPP）的研制

摸索了２７０９碱性蛋白酶水解酷蛋白制备ＣＰＰ的最佳工艺条件：底物浓度１０％、用酶量１５００Ｕ／ｇ底物、反应温度４５℃、ｐＨ１０．５、反应时间１５０ｍｉｎ。采用选择淀淀法分离ＣＰＰ,在ｐＨ４．５添加１．１％ＣａＣｌ２（ｗ／ｖ）和５０％（ｖ／ｖ）乙醇,室温沉淀４ｈ,得到ＣＰＰ产品５０％（ｖ／ｖ）乙醇,室温沉淀４ｈ,得到ＣＰＰ产品的Ｎ／Ｐ、得率分别为６．３９和１３．９４％。     

醇法大豆浓缩蛋白制取工艺的优选

采用先工业己烷后乙醇二次浸出、一次脱溶的工艺，生产醇法大豆浓缩蛋白；通过正交试验，选择的生产工艺条件为：工业己烷一次浸出为常规生产工艺条件，乙醇水溶液二次浸出工艺条件为：温度４５℃、乙醇浓度（体积浓度％）６５％、时间９０分钟及固液比１∶２。     

苦荞麦黄酮提取最佳条件的研究

在不同乙醇浓度（３０％，６０％，９５％），不同固液比（１：８，１：１０，１：２）不同温度（５０℃，７０℃，９０℃）和不同提取时间（１ｈ，２ｈ，３ｈ）等条件下，通过正交试验，对苦荞麦黄酮最佳条件进行了研究，结果表明：最佳提取工艺条件是６０％乙醇，固液比为１：１０，在５０℃下振荡提取１ｈ。     

海藻糖提取工艺的研究

研究从面包干酵母中提取海藻糖。经多次实验，最佳工艺条件为：乙醇浓度为５０％，提取温度８０℃，时间为１．５ｈ，固液比为１：１５。提取液经超滤后再经活性碳，离子交换及脱色除杂。精制后糖液用９５％工业酒精结晶，条件为：温度４０℃，料液比为１：４（Ｖ／Ｖ）同时不断搅拌。     

醇法大豆浓缩蛋白最佳浸出工艺条件的研究

采用先工业己烷、后乙醇二次浸出，一次脱溶的工艺生产醇法大豆浓缩蛋白；实验室研究考察了乙醇浓度、浸出温度、浸出时间、固液比对产品质量的影响。通过正交试验，选择的最佳生产工艺条件为：工业己烷一次浸出为常规生产工艺条件，乙醇水溶液二次浸出工艺条件为：浸出温度４５℃、乙醇浓度６５％（ｗｔ％）、浸出时间６０ｍｉｎ、固液比１∶３。     

玉米蛋白粉中醇溶蛋白提取方法的研究

研究超声波处理法对玉米蛋白粉(CGM)进行脱色的工艺条件和电动搅拌方式提取玉米醇溶蛋白(Zein)的最佳提取条件,确定最佳脱色条件是:以无水乙醇为溶剂,萃取温度50℃,料液比1:12(g/V),超声波处理25min;最佳提取条件是:料液比1:8(g/V),50℃水浴加热,低速搅拌提取3h,乙醇的浓度是75%。分析产品中成分,并用SDS-PAGE的方法对提取物的蛋白组成和纯度进行分析,依据分析结果,并综合考虑成本等因素,确定盐析法为玉米醇溶蛋白的回收方法,最终溶液中氯化钠浓度为0.3%。     

枇杷叶中熊果酸的提取、分离工艺研究

以枇杷叶为原料，采用正交试验法筛选出其有效成分熊果酸的最佳提取及精制工艺条件为：采用超声提取2次，每次20min，乙醇浓度90％；提取物采用石油醚3次除杂，每次加入量为沉淀的15～20倍，24h；乙醇溶解后采用活性炭脱色，活性炭的用量3g／100mL、脱色时间30min、脱色pH3．0和脱色温度70℃；脱色后采用制备薄层分离，展开剂为氯仿：丙酮=4：1（V／V）。乙醇洗脱后，浓缩、干燥得熊果酸。HPLC测定熊果酸含量为95．8％。     

微胚乳玉米醇溶蛋白的提取及氨基酸组成分析北大核心CSCD

为促进微胚乳玉米醇溶蛋白的开发和应用,以微胚乳玉米为原料,分别采用乙醇浸提法和超声波辅助乙醇浸提法提取玉米醇溶蛋白,通过单因素实验优化工艺条件,并对微胚乳玉米醇溶蛋白的氨基酸组成进行分析。结果表明:乙醇浸提法提取微胚乳玉米醇溶蛋白的最优工艺条件为提取温度50℃,提取时间2.0 h,乙醇体积分数80%,料液比1∶12;超声波辅助乙醇浸提法提取微胚乳玉米醇溶蛋白的最优工艺条件为乙醇体积分数80%,超声时间40 min,料液比1∶20,超声功率500 W。在各自最优条件下,超声波辅助乙醇浸提法所得微胚乳玉米醇溶蛋白提取率和蛋白质含量分别为45.88%和82.1%,显著优于乙醇浸提法的32.61%和79.2%。微胚乳玉米醇溶蛋白的非极性氨基酸占比为59.11%,高于普通玉米醇溶蛋白的53.38%。综上,与乙醇浸提法相比,超声波辅助乙醇浸提法具有较强的优越性;微胚乳玉米醇溶蛋白较普通玉米醇溶蛋白显示出更强的疏水性。     

超声波-微波协同提取玉米醇溶蛋白的条件优化

以超声波、微波协同预处理手段提取玉米黄色素和醇溶蛋白,在单因素试验的基础上采用正交试验对玉米醇溶蛋白工艺参数进行了研究,确立了玉米醇溶蛋白提取工艺条件。结果表明：当乙醇浓度为80%,时间30min,浸提温度60℃时,玉米醇溶蛋白的提取率最高,可以达到56.8%。     

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