鲍鱼内脏多糖的分离及体外抗氧化的研究

以鲍鱼内脏为原料,采用大孔树脂HZ802(15 m L)对鲍鱼内脏多糖进行分离,得出最适合的分离工艺为:上样液浓度为含0.847 mg·m L~(-1),流速2 BV·h~(-1)进行上样吸附,洗脱剂65%的乙醇,流速以1BV·h~(-1)进行洗脱;在此工艺条件下,鲍鱼内脏多糖得率为83.7%,纯度为68.44%。并对鲍鱼内脏多糖的体外抗氧化进行研究,结论:鲍鱼内脏多糖0.684 mg·m L~(-1)时,对·OH自由基的清除率达到49.59%,对O_2~(2-)的清除率为96.88%;同时对于猪油的体外抗氧化的作用结果为鲍鱼内脏多糖浓度升高对猪油氧化的抑制作用越好。     

大孔吸附树脂分离纯化茶叶籽饼粕中的茶皂素研究

目的对采用大孔吸附树脂法分离纯化茶叶籽饼粕中茶皂素的工艺进行优化,为进一步开发利用茶叶籽资源提供依据。方法以茶皂素吸附率与解吸率为指标,通过静态吸附与解吸实验筛选最优树脂。通过单因素实验、正交实验及验证性实验,优化最优树脂动态吸附与解吸茶皂素的工艺参数。结果D101树脂的静态吸附量与解吸率分别为142.974 mg/g和98.02%,为分离纯化料液中茶皂素的最优树脂;当主要考虑茶皂素得率时,其最优动态吸附与解吸工艺参数为上样质量浓度10 mg/m L、上样流速3 BV/h、上样体积6 BV、乙醇洗脱体积浓度80%、洗脱流速3 BV/h、洗脱剂体积5 BV,在该工艺参数条件下,茶皂素得率为74.25%,纯度为84.30%;当主要考虑茶皂素纯度时,最优动态吸附与解吸工艺参数为上样质量浓度10 mg/m L、上样流速4 BV/h、上样体积7 BV、乙醇洗脱体积浓度70%、洗脱流速3 BV/h、洗脱体积5 BV,在该工艺参数条件下,茶皂素纯度为97.7%,得率为72.04%。结论 D101大孔吸附树脂是一种可应用于茶叶籽饼粕中茶皂素分离纯化的较好树脂。     

AB-8和D-101大孔吸附树脂分离纯化玉竹多糖

以葡萄糖为标准品,利用大孔吸附树脂分离纯化玉竹多糖,结果表明AB-8大孔吸附树脂分离纯化玉竹多糖的最佳上样浓度为1.0 mg/m L,最佳洗脱浓度为75%乙醇,最佳流速为1.0 m L/min,洗脱液体积为上样的10 BV,玉竹粗多糖的纯度从65.23%提高到78.64%;D-101大孔吸附树脂分离纯化玉竹多糖的最佳上样浓度为0.6 mg/m L,最佳洗脱浓度为50%乙醇,最佳流速为1.0 m L/min,洗脱液体积为上样的10.5 BV,玉竹粗多糖的纯度从65.23%提高到73.79%。AB-8大孔吸附树脂对玉竹多糖的分离纯化效果优于D-101大孔吸附树脂。     

膜分离与大孔树脂联用技术纯化茶皂素

采用膜分离与大孔树脂联用技术纯化茶皂素。粗茶皂素经陶瓷膜和360Da纳滤膜初步分离浓缩,得率为62.1%,纯度为79%;根据静态和动态吸附筛选试验,选择大孔树脂AmberliteXAD7HP对茶皂素进一步纯化,通过单因素试验,确定最佳工艺参数为:上样流速0.5 mL/min、上样液浓度30mg/mL;以10%,40%,70%的乙醇溶液进行梯度洗脱,洗脱剂流速1mL/min,洗脱液体积为3BV,该条件下纯化,茶皂素最终得率为55.3%,纯度可达95%。该试验表明膜分离与大孔树脂联用技术可得到高纯度的茶皂素,是一种可工业化推广的方法。     

油茶皂素大孔树脂纯化工艺优化及LC/TOF-MS分析

以市售低纯度茶皂素粗品为原料,采用AB-8大孔树脂进行纯化,得到最佳纯化工艺为30g/L粗皂素溶液上样,30%乙醇洗脱除去多数色素和部分蛋白等杂质,70%乙醇溶液主要洗脱出茶皂素,油茶皂素的得率为55.5%,纯度提高1.86倍。大孔树脂重复利用8次后,吸附和洗脱效果基本不变,放大试验证明其适合工业化生产。LC/TOF-MS分析表明油茶皂素的分子质量主要集中在1170～1304D之间,并确定了一种油茶皂素的分子式为C58H89O26,同时推测了其结构式。     

大叶藻总黄酮的大孔树脂纯化工艺

为纯化大叶藻中提取的总黄酮,选择5 种大孔吸附树脂,通过静态吸附和解吸实验,选定两种最优树脂D101-1和AB-8;再将两种树脂进行混合实验,选出混合吸附树脂最优混合比例,最后确定最佳纯化工艺条件：D101-1和AB-8吸附树脂按2∶3比例混合、上样液pH 3、样液质量浓度1.25 mg/mL、洗脱液乙醇体积分数70%,上样量和上样流速分别为6 BV和3 BV/h,洗脱体积和洗脱流速分别为5 BV和3 BV/h条件下进行纯化实验,样液中的总黄酮含量由原来（12.66±0.42）%上升至（51.25±1.26）%。     

大孔树脂串联吸附原花青素和茶皂素的工艺研究

采用大孔树脂分级串联的方法吸附茶壳提取液中的原花青素和茶皂素,经试验得到最佳工艺条件:将茶壳提取液经过DM–130大孔树脂进行1级吸附,调节上柱液中茶皂素的浓度为1.5 mg/m L,pH为6,吸附流速为1.5 BV/h,吸附完毕后采用50%乙醇进行洗脱,洗脱液浓缩干燥后得到纯度为85.6%的茶皂素产品。收集流出液并经S–8树脂进行2级吸附,调节上柱液中原花青素的浓度为1 mg/m L,pH为4,吸附流速为2 BV/h,吸附完毕后采用30%乙醇进行洗脱,洗脱液浓缩干燥后得到纯度为73.7%的原花青素产品。     

SA-3大孔树脂纯化甜茶素的研究

通过比较9种大孔树脂对甜茶素的吸附和解吸效果,筛选出适合甜茶素分离纯化的树脂,并对其纯化工艺条件进行了探讨。结果表明,SA-3型大孔吸附树脂最适合甜茶素纯化。最佳吸附条件为:上柱液甜茶素浓度控制在1.00 mg/m L~3.00 mg/m L,上样流速3 BV/h,上样液体积控制在17 BV以内;最佳洗脱条件为:70%乙醇3 BV/h洗脱,洗脱体积为13 BV。经SA-3型大孔吸附树脂纯化纯度甜茶素可达到45%左右。     

D101型大孔树脂纯化茶皂素的研究

研究了用D101型大孔树脂纯化茶皂素的工艺参数,当上样量为25mL、上样液浓度为30mg/mL、上样流速3mL/min时,吸附率达66.4%。用5倍树脂体积的85%乙醇洗脱,解吸率达83.6%,产品纯度92%。     

大孔树脂纯化茶皂素工艺研究

采用大孔树脂对茶皂素粗品进行分离纯化。以茶皂素得率为指标,采用响应面法优化洗脱条件。通过考察不同极性的大孔树脂D-101、AB-8、S-8、X-5、HPD-100的吸附与解吸性能,从中筛选出具有代表性的S-8大孔树脂,并对其吸附和解吸能力进行综合分析。确定S-8大孔树脂纯化茶皂素最佳工艺条件为:S-8大孔树脂装柱量100 g,质量浓度为0.703 mg/m L的茶皂素溶液110 m L,上样流速3.03 m L/min,洗脱剂乙醇体积分数90%,乙醇流速3.03 m L/min,乙醇用量100 m L。在最佳条件下,对含量为47.38%的茶皂素粗品进行分离纯化,最终茶皂素得率为81.74%,回收率为78.29%,含量为85.36%。     

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