曲霉型豆豉类黑精的提取与精制

本文研究了用水浸提和树脂精制曲霉型豆豉类黑精。实验结果表明：水浸提法粗提曲霉型豆豉类黑精的最佳工艺参数为：料液比为1：15，提取时间为8h，提取级数为二级；大孔树脂精制曲霉型豆豉类黑精的最佳工艺条件为：吸附流速为1．5mL／min；在室温和解吸流速为1．5mL／min的条件下，以60％乙醇作为解吸剂时洗脱效果最好。     

大孔树脂分离纯化枳实总黄酮工艺研究

目的研究大孔吸附树脂富集、纯化枳实总黄酮的工艺条件及参数。方法以总黄酮含量、吸附率及解吸率为指标筛选分离纯化枳实总黄酮的工艺。结果柱流速1mL／min,上柱液浓度约1．0mg／mL,除杂洗脱水用量75mL,洗脱剂乙醇浓度50％,乙醇用量52．5mL时,枳实总黄酮含量达92．78％。结论D101型大孔树脂对枳实总黄酮有较好的吸附分离性能,是分离纯化枳实总黄酮的适宜大孔树脂。     

大孔树脂分离纯化枳实总黄酮工艺研究

目的研究大孔吸附树脂富集、纯化枳实总黄酮的工艺条件及参数。方法以总黄酮含量、吸附率及解吸率为指标筛选分离纯化枳实总黄酮的工艺。结果柱流速1mL／min,上柱液浓度约1．0mg／mL,除杂洗脱水用量75mL,洗脱剂乙醇浓度50％,乙醇用量52．5mL时,枳实总黄酮含量达92．78％。结论D101型大孔树脂对枳实总黄酮有较好的吸附分离性能,是分离纯化枳实总黄酮的适宜大孔树脂。     

大孔树脂分离纯化黑果枸杞总黄酮的研究

目的：研究大孔树脂分离纯化黑果枸杞总黄酮的工艺条件及参数。方法：利用单因素试验和多因素正交试验研究大孔树脂分离纯化黑果枸杞总黄酮的最佳工艺条件。结果：AB-8 型大孔树脂分离纯化黑果枸杞总黄酮的最佳工艺条件为：上样液浓度0.200mg/ml,流速2ml/min,pH5;以95% 的乙醇洗脱,流速4ml/min,用量为5 倍柱床体积。AB-8 树脂的饱和吸附量为0.64691mg/g 树脂,重复利用9 次吸附量仍然很好。采用该工艺分离纯化黑果枸杞总黄酮含量达28%。结论：AB-8 树脂分离纯化黑果枸杞总黄酮效果较好,工艺的重复性和稳定性良好,适合于工业化生产。     

湿法研磨结合喷雾干燥制备苦荞麸皮超微粉工艺优化

研究苦荞麸皮超微粉的制备工艺,以总黄酮含量为考察指标,采用单因素-正交试验优化确定湿法研磨最佳工艺条件;以集粉率为考察指标,采用单因素-响应面试验对喷雾干燥工艺进行优化。结果表明,研磨转速2 600 r/min,研磨时间1.0 h,料液比1:7（g/mL）时,测得麸皮粉的总黄酮含量为8.55 g/100 g,高于对照组的4.93g/100g。采用响应面优化后的干燥工艺进行验证试验,即进口温度164℃、进风量0.43 m3/min、料液浓度5.85%和进样流量620 mL/h,苦荞麸皮粉的集粉率为68.72%。扫描电镜结果显示最佳制备工艺制备的超微粉粒径更小,组织结构受到严重破坏,淀粉、蛋白质等小颗粒得到释放。湿法研磨结合喷雾干燥制备苦荞麸皮超微粉,集粉率较高,总黄酮含量有显著增加,超微粉微观结构发生明显变化。     

维药新塔花中总黄酮纯化工艺研究

以新疆特有的芳香新塔花为研究对象,通过用大孔树脂对提取的总黄酮进行吸附与解吸,对大孔树脂进行筛选,确定比较理想的大孔树脂。采用吸附率最大和解析率最大的大孔树脂对芳香新塔花总黄酮其他纯化工艺参数进行考察,包括上样浓度、大孔树脂梯度洗脱、径高比、上样液流速的影响。最佳纯化工艺为：大孔树脂型号为HPD-600,上样液浓度为4．70mg／mL,径高比为1：10,七样液流速为0．5mL／min,洗脱时合并30％vol、50％vol、70％vol的乙醇洗脱液。     

Purification of Flavonoids from TrigoneUa foenum-graecum L. Seeds by Macroporous Adsorption Resin

通过比较11种大孔吸附树脂对胡芦巴黄酮类化合物的静态吸附与解吸性能,筛选出DMl30型大孔吸附树脂用于分离纯化胡芦巴种子中的黄酮类化合物。采用单因素方法分析该树脂富集纯化胡芦巴总黄酮的适宜工艺条件,确定优化的工艺条件为i上样量为3．64mg黄酮／g树脂,上样液pH值5．0,吸附时间2h,体积分数70％乙醇洗脱,洗脱速率2mL／min,洗脱体积为150mL,总黄酮回收率为85．05％,提取物中黄酮含量由7．8％提高到26．5％。     

大孔吸附树脂纯化姜辣素研究

本文研究了采用大孔树脂对生姜中姜辣素进行纯化的工艺，初步探讨了不同影响因素对姜辣素纯化的影响，得出大孔树脂纯化的最佳工艺条件，即：树脂类型选用AB-8型；树脂用量是40mg姜辣素／g干树脂；洗脱溶剂选用正己烷：乙醇=7：3；洗脱速度为0．4ml／min。纯化后姜油含姜辣素48．3％。     

大孔树脂富集分离葡萄叶总黄酮的研究

目的优化大孔吸附树脂分离纯化葡萄叶黄酮类化合物的工艺条件。方法采用分光光度法,以芦丁为标准品,采用硝酸铝显色法测定总黄酮含量;以葡萄叶总黄酮的含量、吸附量和解吸率为考察指标,通过静态及动态实验,筛选出理想的吸附树脂,并通过单因素试验确定了葡萄叶总黄酮富集分离的优选操作条件。结果 D-101树脂是吸附葡萄叶提取液中总黄酮较理想的树脂,对其优化的工艺参数为:最佳吸附p H值:p H=3,洗脱剂浓度:70%的乙醇,最佳上样流速:0.8 m L/min,最佳上样液浓度:65.65 mg/L,最佳解吸流速:0.8m L/min。结论 D-101树脂对葡萄叶总黄酮的吸附量大,解吸容易,环境友好,确定的吸附与洗脱条件简单可行,此工艺具有良好的产业化前景。     

从发酵废母液中回收衣康酸技术的研究

从多种阴离子交换树脂中筛选出一种树脂D311处理衣康酸发酵废母液,湿树脂饱和交换容量为0．185g衣康酸／mL;确定了离子交换法回收衣康酸主要工艺条件：上柱流速为5．0mL／min;最佳洗脱条件为以1．5mol／L的氢氧化钠溶液为洗脱剂,洗脱流速为8．0mL／min;在最佳上主流速和洗脱奈件下进行多批次衣康酸回收率的研究,其回收率分别为73．13％、71．33％和72．34％．     

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