酒精法和盐析法提取柚子皮果胶的比较研究

本文通过酒精法和盐析法从鲜柚皮和干柚皮中提取抽皮果胶的结果表明：柚皮果胶的提取以鲜柚皮作原料为好；盐析法提取柚皮果胶具有成本低、得率高等特点。     

用盐析法从烟末中提取果胶的研究

研究了用盐析法从烟末中提取果胶,通过正交实验,对提取条件进行了探讨。试验表明,用水萃取烟末中果胶时,萃取温度、萃取时间、萃取液用量及萃取液ｐＨ值都对果胶产量有一定影响;盐析法从１０ｇ烟末中提取果胶较为适宜的条件是：萃取温度为９０～１００℃、萃取时间为１．５ｈ、萃取液用量为１００ｍｌ及萃取液ｐＨ值为１．０     

不同方法提取香蕉皮中果胶的研究

香蕉皮经不同方法提取而得果胶提取液,分别以乙醇沉淀法和盐析法从提取液中沉淀果胶。研究并取得了不同提取方法的最佳提取条件,比较了不同提取方法的乙醇消耗量,探索了不同方法对果胶提取得率和品质的影响。结果表明:酸解醇析法所消耗的乙醇量几乎为盐析法乙醇消耗量的两倍;盐析法省去稀酸提取液浓缩工序和减少乙醇回收量,节省能耗,降低生产成本,并能保证较高的提取得率和果胶品质。     

马铃薯渣中果胶的提取工艺

以马铃薯渣为原料,利用超声波辅助盐析法提取果胶。结果表明,盐析法提取马铃薯渣果胶的最佳条件为酸解温度90℃,酸解时间1.5 h,盐析pH5,硫酸铝用量15%,果胶得率为13.69%,而用超声波处理的最佳条件为超声波处理酸解时间40min,功率100W,酸解温度70℃,果胶得率为18.21%,比盐析法高4.52%。     

盐析法提取柚子皮果胶工艺的研究

研究了用盐析法从柚皮中提取果胶的工艺条件。结果表明,盐析法提取柚皮果胶的最佳工艺条件为提取液pH值1.5,提取温度90℃,提取时间50min,料液比1∶25（g∶mL）,饱和明矾溶液与水解液体积比1∶1,盐析温度60℃,盐析时间50min,盐析pH值4.0。在此工艺条件下,果胶得率为18%。     

苹果渣果胶提取工艺条件的研究

以苹果渣为原料,分别采用盐析法和醇沉法研究提取果胶的最佳工艺.盐析法提取果胶的条件为:酸提液pH为2.0,酸提时间1.0h,以硫酸锌为盐析用盐,添加量2%,脱盐液(10%HCl,70%乙醇)用量100mL.醇沉法从苹果渣中提取果胶的条件为:酸提液pH为1.5,料液比为1∶15,酸提时间为1.5 h,乙醇用量150mL.从产品得率和质量比较均为醇沉法提取果胶较好.     

从仙人掌中分离提取果胶的研究

研究了用盐析法从仙人掌中提取果胶的工艺条件。通过在不同条件下测量果胶含量及提取率，得出了用盐析法从仙人掌中提取果胶的最佳工艺条件。通过用不同的脱色剂对果胶脱色进行比较，得到双氧水脱色较为明显，并确定了脱色工艺。     

豆腐柴中有效成分复合分离提取研究

试验以豆腐柴叶为原料，采用复合分离提取工艺，提取叶中的蛋白质和果胶产品。首先通过不同溶剂提取蛋白质，得到碱溶性蛋白质〉水溶性蛋白质〉醇溶性蛋白质〉盐溶性蛋白质的结论；并对提取蛋白质后的上清液和滤渣进行了提取果胶的最佳条件和参数的确立，进行了萃取果胶时的萃取液种类、pH和盐析果胶时的盐的用量的单因素实验，又以萃取时的温度、pH、时间和料液比四个因素四个水平进行了正交试验，得到如下结论：从豆腐柴叶中复合提取分离蛋白质和果胶的最佳提取工岂条件：以盐溶液作为复合提取剂较为理想，果胶提取分离的最佳条件为萃取温度90℃、溶液pH值4、萃取时间95min、料液比l：45，在此条件下豆腐柴叶果胶的产量为22％，同时可得到0．15％的蛋白质。     

盐析法从苹果渣中提取果胶的工艺条件研究

探讨了以苹果渣为原料用盐析法提取果胶的工艺条件。本实验首次系统地采用五种盐进行果胶沉淀析出的对比研究，通过筛选确定了硫酸铝作为果胶沉淀剂，同时对盐析时盐用量、pH值、温度、反应时间等影响因素进行实验，得到盐析法的最佳工艺条件，为批量生产提供了依据。     

栀子黄色素纯化研究

本文研究了从干栀子果中经抽提、萃取、层析法纯化栀子黄色素的工艺条件，栀子粉以70%的乙醇水溶液提取，再经正丁醇萃取除去栀子苷，粗品经聚酰胺层析分离出栀子素，纯化栀子黄色素的得率为4.54% ,A238/A440之比约0.2。     

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