荷叶黄酮提取工艺研究

本文用三种干燥方法（自然晾干，低温烘干，真空冻干）对新鲜荷叶进行干燥，并对荷叶黄酮提取工艺条件进行了优化。实验结果表明：三种干燥方法相比，冻干后的荷叶综合效果最好，色、香、味纯正，荷叶黄酮损失少；荷叶黄酮浸提最佳工艺条件为：乙醇溶液浓度70％，浸提温度80℃，料液比1：30，浸提时间2h，浸提次数3次；在最佳条件下浸提荷叶总黄酮含量达36．19mg／g。     

决明子水溶性多糖提取的研究

采用热水浸提法提取决明子水溶性多糖。选择浸提时间、温度、浸提固液比以及提取次数作为单因素进行梯度实验，确定其条件范围，再通过进一步的正交实验得到决明子水溶性多糖浸提工艺的优选因素组合：浸提时间2．5h，温度80℃，固液比为1：30，反复浸提两次。     

绿豆蛋白质饮料工艺研究

以绿豆为主要原料,辅以荷叶、菊花、金银花等中草药研制保健饮料.通过正交实验确定绿豆蛋白的提取工艺和荷叶、菊花、金银花有效成分的提取工艺.结果表明,提取绿豆蛋白质的最佳工艺为绿豆蛋白提取液按照料液比1：8,浸提温度80℃,浸提液pH值为8,盐浓度0.3g/L;荷叶、菊花、金银花等采用水提法、二级浸提的方式,最优提取条件为料液比为1：15,荷叶与金银花的浸提温度80℃,浸提时间30min,菊花的浸提温度70℃,浸提时间20min,将浸提液调配获得绿豆蛋白质饮料.     

荷叶膳食纤维抗氧化物质提取研究

荷叶经粉碎、乙醇提取两次、蒸发浓缩、石油醚脱脂、再次浓缩后，得到抗氧化活性物质粗产物，再进行定性实验，并研究了荷叶提取物粗黄酮在猪油中的抗氧化性．结果表明，用正交实验得出抗氧化物的最佳提取工艺为：浸提时间4h，浸提温度为70℃，加入乙醇的固液比为：1：20；从荷叶中得到抗氧化活性物质粗产物为19g／100g；抗氧化活性物质粗产物进行定性检验的反应，反应均呈一定颜色，表明其中含有黄酮类化合物；本实验提取过程步骤简单易行，所用溶剂成本较低，所得粗提物的抗氧化性也较强，对于荷叶中类黄酮的开发利用具有一定的实际意义。     

莲子可溶性多糖提取工艺的研究

对莲子中的有效成分可溶性多糖的提取工艺进行了研究。在单因素试验的基础上，通过正交实验确定了莲子多糖提取最佳工艺，料液比1：15，浸提时间3h，浸提温度100℃，在此条件下提取率可达0．82％。     

苜蓿多糖提取优选工艺条件的研究

选择热水浸提，以浸提时间，温度，浸提固液比以及提取次数作为单因素进行梯度实验，通过方差分析，并进行LSD多重比较作显著性分析，确定其条件范围，再通过进一步的正交实验L9(3^4)得到苜蓿水溶性多糖浸提工艺的优选因素组合：浸提时间1h，温度100℃，固液比1：40，浸提三次。粗多糖提取率达6．80％，经醇沉，5％三氯乙酸正丁醇溶液及氯仿正丁醇溶液（5：1）分离纯化，得脱蛋白粗多糖。     

百合多糖提取的影响因素研究

本文通过用L9（3^3)正交实验对百合多糖提取率的各影响因素进行了实验与分析，并初步确定百合多糖量佳提取工艺条件为：浸提温度95℃、浸提时间2h、固液比1：5。     

荷叶中黄酮提取工艺的研究

本研究采用乙醇提取荷叶中的黄酮成分.对固液比、浸提温度、浸提时间和乙醇浓度进行了单因素梯度实验,确定了其条件范围;通过进一步正交实验得到荷叶黄酮提取的最佳因素组合.醇提荷叶黄酮的最佳因素组合:乙醇浓度65%,浸提温度35℃,浸提时间2.5h,固液比1:25.     

新疆黑桑椹多糖的提取和测定

本实验采用热水浸提法从新疆黑桑椹中提取多糖,利用正交试验设计法优选最佳提取工艺,并采用改良的苯酚．硫酸法测定多糖含量。结果显示,影响桑椹多糖得率因素的优先次序为：浸提时间〉固液比〉温度〉浸提次数;桑椹多糖水提法最佳提取工艺条件为浸提时间2h、固液比1：30、浸提温度70℃、浸提3次。在此工艺下多糖得率为3．24％。     

固体发酵蜜环菌多糖提取工艺的研究

研究了从固体发酵蜜环菌菌丝体中提取水溶性多糖的工艺。通过比较,证明了冷冻能提高多糖的提取效率;通过单因素实验,确定水溶性多糖的提取工艺;正交试验进一步优化提取工艺：即浸提时间2．5h、浸提90℃、固液比1：5为最佳提取条件。     

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