张氏马尾藻甘露醇的提取工艺

为优化张氏马尾藻甘露醇的提取工艺,研究分析浸提温度、料液比以及浸提时间对甘露醇提取效果的影响,通过单因素试验和正交试验得到提取甘露醇的最佳工艺参数：浸提温度100℃,料液比1∶100（g/mL）,浸提时间2.0 h。在此最佳工艺条件下,甘露醇提取量达5.636 mg/g。此外,对提取效果影响最大的因素是浸提温度,其次是料液比,影响最小的是浸提时间。     

花菇多糖的提取工艺优化

采用中心组合实验对花菇水溶性和碱溶性多糖的提取工艺进行了优化。实验结果表明：花菇水溶性多糖的最佳提取条件为提取温度94．34℃，提取时间为3．5h，料液比为1：61．88，在此条件下花菇中水溶性多糖得率最高达到6．78％；花菇碱溶性多糖的最佳提取条件为碱NaOH浓度为1．816mol／L，提取时间为1．7h，料液比为1：60，此时花菇中碱溶性多糖得率最高可达到3．95％。     

响应面优化草石蚕多糖提取工艺研究

以草石蚕为原料，研究了草石蚕中多糖提取的工艺条件。在单因素试验基础上，通过响应面试验优化了草石蚕中多糖提取的工艺条件。结果表明，草石蚕中多糖的最佳提取工艺条件为：提取温度79．00℃，提取时间2．82h，乙醇体积浓度81．22％，料液比1g：18．49mL，此条件下草石蚕多糖提取率4．89％。     

桂花黄酮类化合物最佳提取工艺研究

通过乙醇浸提及正交试验探讨了从三个桂花品种中提取黄酮的最佳工艺条件。苏州农院银桂：乙醇浓度80％，提取时间3h，固液比1：40，提取温度90℃，总黄酮含量19．16％。苏州光福金桂：乙醇浓度80％，提取时间3h，固液比1：40，提取温度70℃，总黄酮含量17．14％。苏州光福银桂：乙醇浓度60％，提取时间2h，固液比1：60，提取温度70℃，总黄酮含量17．86％。     

超声波提取荞麦壳色素工艺的研究

以乙醇水溶液为提取剂，应用超声波技术从荞麦壳中提取色素。单因素试验和正交试验表明：乙醇浓度对提取效果的影响最大，其次为料液比、pH值和提取时间。最佳提取工艺条件为：粒度80目，乙醇溶液70％，料液比1：50，pH值1．0，提取时间4min，提取2次。此时产品得率为4．69％，色价为17。     

桂花总黄酮的提取工艺

通过乙醇浸提及正交试验探讨了从桂花中提取黄酮的最佳工艺条件．实验结果表明：乙醇浓度80%，提取时间3h，固液比1：40，提取温度90℃时，总黄酮的提取效果最好．     

辣木叶总黄酮乙醇提取工艺的研究

对辣木叶中总黄酮的乙醇提取工艺进行了研究。探讨乙醇浓度、浸提温度、料液比、浸提时间、浸提次数对辣木叶中总黄酮提取效果的影响，在单因素试验的基础上,通过正交试验确定最佳提取工艺条件。结果表明：辣木叶中总黄酮类物质的最佳提取条件为70％的乙醇溶液作提取剂，提取温度60℃，料液比1：20，提取3次，每次1h，在此条件下，提取液中的总黄酮含量达到3．95％。     

蜜环菌菌粉中甘露醇测定方法的比较与优化

目的：比较对蜜环菌菌粉的不同预处理方法和甘露醇含量测定方法,筛选更有效的方法对蜜环菌菌粉中甘露醇含量进行测定。方法：用醇提取、水提取和超声波破碎法对蜜环菌菌粉进行甘露醇提取比较,并选出最优者;使用浓盐酸与样品液共热去除果糖干扰;采用碘量法和分光光度法分别对蜜环菌菌粉进行甘露醇含量测定比较。结果：以水为溶剂,80℃下对蜜环菌菌粉进行超声波破碎,相对醇提取法和水提取法能有效提高甘露醇测定值;浓盐酸与样品液沸水共热可有效去除果糖干扰;在存在葡萄糖等单糖对甘露醇干扰的情况下,分光光度法测定值相对碘量法更准确。结论：以超声波破碎预处理、浓盐酸去除果糖干扰,采用分光光度法为具体测定方法的组合方式为最佳测定方法。     

甘草渣中黄酮和多糖的提取及含量测定

本文以提取甘草酸后的甘草渣为原料，分别以乙醇和水为溶剂，采用超声辅助提取法提取甘草黄酮和多糖，通过正交设计实验，筛选出最佳提取条件，用紫外分光分光光度法测定黄酮和多糖的含量。结果表明：甘草渣中黄酮类化合物的最佳提取条件为：超声时间75（25，25，25）min，提取温度45℃，乙醇浓度80％，固液比1：12，提取3次，甘草黄酮的含量为2．69％。甘草多糖的最佳提取条件为：超声时间75（25，25，25）min，超声温度65℃，固液比为1：12，提取次数3次，甘草多糖的含量为7．89％。     

墨旱莲总黄酮提取工艺的研究

考察各种提取条件对墨旱莲总黄酮乙醇提取和水提取结果的影响，并通过正交实验优化工艺条件，得到最佳醇提工艺条件是：提取温度80℃、提取时间3h、乙醇浓度70％1．最佳水提工艺条件是：提取温度90℃、提取时间2．5h、料液比l：30。在此条件下，得到的墨旱莲总黄酮的乙醇提取得率是2．97％，稍高于水提取得率2．87％。     

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