相思菇多糖超声波辅助提取工艺研究

通过单因素以及正交试验研究水浴及超声波辅助提取相思菇子实体多糖的最佳工艺.研究结果表明:水浴提取相思菇子实体多糖的最佳方法:料液比1:60,水浴时间90min,水浴温度60℃.通过单因素试验与正交试验均得出超声波辅助提取相思菇多糖,最佳试验方案为:料液比1:140,超声时间20min,浸提液pH8.0.对两种提取法进行了比较,超声波辅助提取法优于水浴提取法.     

响应曲面法优化超声辅助提取芦荟凝胶多糖的工艺

采用响应曲面法对超声波辅助提取库拉索芦荟凝胶中的多糖提取工艺参数进行优化研究.考察超声时间、提取液pH值、液料比对芦荟多糖提取率的影响,并建立数学模型.利用Design-Expert软件对数据进行回归分析,得到芦荟多糖提取率的二次多项式回归方程的预测模型.结果表明,库拉索芦荟多糖超声辅助提取的优化工艺条件为:超声时间为45.85min、提取液pH值为8.74、液料比为29.84mL/g,在此条件下的库拉索芦荟多糖提取率为11.453mg/g.     

库拉索芦荟凝胶多糖超声提取工艺的响应面法优化

为研究响应曲面法优化库拉索芦荟凝胶多糖的超声辅助提取工艺,研究考察了超声功率、超声时间、提取温度、提取液pH和液料比等因素对芦荟多糖提取率的影响,在单因素实验的基础上采用4因素3水平的响应曲面分析法。结果显示,库拉索芦荟凝胶多糖的超声辅助提取工艺最优条件为:超声功率600 W、超声时间45 min、提取温度70℃、提取液pH8.9、液料比5:1、超声提取1次,在此工艺条件下多糖的实际提取率为0.1511%。该试验建立的数学模型极显著,可以较好地模拟和预测芦荟多糖的提取率。     

淫羊藿叶多糖的超声辅助提取工艺研究

通过单因素以及正交试验进行水浴及超声辅助提取淫羊藿叶多糖的工艺优化,用硫酸-葸酮比色法测量淫羊藿叶多糖的含量,并对两种工艺的提取结果进行比较.研究结果表明,水浴提取淫羊藿叶多糖的最佳工艺为料液比1∶80、提取时间60min、提取温度80℃、提取液的pH为8.0.超声辅助提取淫羊藿叶多糖的最佳工艺为料液比1∶60、超声强度100W、超声处理时间10min、提取液的pH值7.0.超声辅助提取淫羊藿叶多糖的得率比水浴提取的提高了68.7％,超声辅助提取淫羊藿叶多糖明显优于水浴提取法.     

超声波辅助提取佛手废渣中果胶的工艺研究

探讨了超声波辅助提取佛手废渣中果胶的工艺条件.通过考察料液比、浸提pH值、浸提温度和超声浸提时间4因素对果胶提取率的影响,并在单因素的基础上设计了正交试验,确定了果胶提取的最佳工艺条件.正交试验优化后的最佳提取工艺条件为料液比1∶50g/mL,浸提pH值1.0,浸提温度90℃,超声时间90min,在此工艺条件下,果胶的提取率达到18.42%.利用超声波辅助提取可以有效缩短提取时间,具有成本低、效率高、工艺简单和环境污染小等优点,对佛手废渣的综合利用具有一定的参考价值.     

超声波辅助法提取滑菇多糖的工艺研究

为提高滑菇多糖的得率,采用超声波辅助法提取滑菇多糖.分剐对超声时同、超声功率、液料比、水浴浸提时间4个因素进行单因素试验和正交试验.得到最优提取条件以水为浸提剂提取滑菇多糖,超声时间40min、超声功率700W、液料比22mL/g、水浴浸提时间0.5h,此条件下的滑菇多糖粗品得率达13.5%.     

正交试验法优化超声辅助提取大蒜多糖工艺

以大蒜为原料,采用超声波辅助法提取大蒜中的多糖,以多糖提取率为考察指标,在单因素试验基础上,通过L9(34)正交试验设计优化最佳提取工艺条件。结果表明:影响大蒜多糖提取率的主要因素是超声浸提温度与料液比,大蒜多糖超声辅助提取的最佳工艺条件为超声浸提温度50℃,超声浸提时间40min,超声功率350W,料液比1∶40(g/mL),此工艺条件下多糖提取率达25.12%。正交试验法优化得到的提取工艺稳定合理,可作为大蒜多糖提取的一种有效手段。     

金针菇菌丝体多糖超声提取工艺的研究

目的：研究金针菇菌丝体多糖超声辅助提取的最佳工艺。方法：通过单因素以及正交试验进行超声辅助提取金针菇菌丝体多糖;采用蒽酮比色法测量金针菇菌丝体多糖的含量。结果：超声辅助提取金针菇菌丝体多糖,最佳工艺条件为：料液比1：100、超声强度80W、超声处理时间10min、浸提液pH8．0。结论：水浴提取法平均提取率为1．16％,超声辅助提取金针菇菌丝体多糖的得率率平均为3．46％,提高了198．28％。这说明超声辅助法提取金针菇菌丝体多糖明显优于水浴法。     

超声波辅助提取灵芝菌丝胞内多糖的研究

采用正交试验优化了超声波提取多糖的工艺条件,得出最佳工艺条件为:超声功率1 300 W、超声提取时间60 min、料液温度70 ℃、料液比1∶9,在此工艺条件下,测得提取液中多糖含量为9.0 g/kg.     

橘红皮多糖的超声波萃取工艺

利用超声波辅助法提取橘红皮多糖,先考察不同粉碎粒度、料液比、超声波功率、超声波时间和浸提次数对橘红皮多糖提取率的影响,然后利用正交试验,优化橘红皮多糖的提取工艺,并对结果进行分析.结果显示,橘红皮多糖最佳提取工艺参数为:粉碎粒度30目、料液比1:40(g/mL)、超声波功率120w、超声波时间40min、浸提次数3次.     

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