紫苏抑菌成分的提取工艺研究

研究乙醇浸提法从紫苏中提取抑菌成分--黄酮类化合物和迷迭香酸的优化工艺条件.在单因素实验的基础上,采用正交实验优化其提取工艺,并用NaNO2-Al(NO3),-NaOH显色法和FeSO4比色法分别测定黄酮类化合物和迷迭香酸的得率.确定最佳工艺条件为:90%乙醇为提取剂,提取温度为65℃,提取时间为3h,料液比为1∶50(w/v),紫苏抑菌成分得率为23.63mg/g.     

库拉索芦荟多糖的提取

以库拉索芦荟冻干制品为原料，采用水提法对芦荟多糖的最佳提取工艺条件进行了研究。结果表明，最佳提取工艺条件为：料水比1：50，提取温度50℃，提取时间5h，得率12．09％。     

元宝枫叶总黄酮的提取研究

用乙醇作为溶剂，采用常规浸提法及超声辅助法对元宝枫叶总黄酮的提取进行了对比研究。通过单因素及正交试验结果得到浸提法的优化条件为：溶剂为体积分数50％的乙醇溶液，料液比1g：25mL，提取时间1．5h，浸提温度70℃。按照此条件提取两次，第一次提取率94．16％，第二次1．36％；超声辅助法的优化条件为：溶剂为体积分数50％的乙醇溶液，料液比1g：15mL，提取时间0．5h，浸提温度60℃。按照此条件提取两次，第一次提取率为96．29％，第二次提取率为3．11％．     

桂花总黄酮的提取及抗氧化能力研究

利用溶剂浸提法通过正交试验,探讨从桂花中提取黄酮的最佳工艺条件,通过紫外分光光度法测定桂花中总黄酮的含量,用DPPH法测定其抗氧化能力。试验结果表明：用80％乙醇,浸泡14h,提取时间3h,固液比1：30（W：V）,提取温度70℃时,桂花总黄酮的提取效果最好。最佳提取条件下黄酮的质量分数是13．54％,EC50为1．15g/L。桂花具有较强的抗氧化能力。     

乌饭叶多酚提取工艺的研究

采用醇提法提取乌饭叶多酚类物质,通过单因素及正交试验确定了最佳提取工艺为：浸提温度75℃,乙醇浓度50％,固液比1：40,提取时间2．0h,提取2次。方差分析表明固液比和提取时间对多酚提取效果影响极显著,经确证试验表明该条件下乌饭叶一次提取液中多酚含量达11．36％。     

苦丁茶中熊果酸提取工艺研究

采用正交设计L6（4^5）组合了提取工艺，用高效液相色谱法对不同工艺下熊果酸的提取率进行了测定。确定苦丁茶中熊果酸的最佳提取工艺条件为：以95％乙醇为溶荆，料液比1：12，水浴回流3小时。提取3次，提取率达1．769％。     

生姜皮总黄酮的提取工艺研究

以生姜加工的废弃物生姜皮为原料,提取生姜皮中总黄酮。采用乙醇浸提法,以总黄酮得率为提取指标,通过单因素实验和正交试验研究生姜皮总黄酮的最佳提取工艺。结果表明：生姜皮中总黄酮的最佳提取工艺为乙醇浓度75％、、浸提时间5．5h、浸提温度60℃、料液比1：45,此条件下总黄酮得率0．61％。     

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,通过正交实验,对苦荞麦黄酮提取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。     

荸荠黄酮提取技术研究

采用分光光度法,研究影响荸荠中黄酮类化合物提取量的多种因素,并通过L9（3^4）正交试验设计优化出提取荸荠中黄酮类化合物的最佳工艺条件。结果表明,荸荠中总黄酮的含量为0．8621％,乙醇提取法的最适工艺参数是浸提剂乙醇浓度60％、提取温度70℃、料液比1：50、浸提时间3．5h。     

芹菜叶黄酮提取工艺条件优化研究

采用硝酸铝盐分光光度法测定芹菜叶中的总黄酮含量，研究用乙醇回流提取芹菜叶黄酮的最佳工艺条件，乙醇提取的优化条件为乙醇浓度为70％、料液比（W：V）1：10、提取温度90℃、提取时间120min。     

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