二乔木兰花红色素的微波辅助提取工艺与特性

采用L9(34)正交设计法,运用微波前处理辅助提取技术并结合光谱检测法,研究了二乔木兰(MagnoliasoulangeanaSoul.-Bod.)花红色素的微波助提工艺效果和色素的特性。结果表明:二乔木兰花红色素为醇溶性花色甙类;该色素耐热、耐低pH,对高浓度糖和紫外光的耐受性较好,但对散射光、碱、氧化还原剂及Fe3+、Cu2+、Pb2+耐受性较差。在乙醇浓度和用量、微波(中火力档)前处理时间、浸提温度4个提取因子中,以乙醇用量对色素提取率起主要影响,微波(中火力档)前处理有利于色素的快速提取,最佳提取条件为15g花瓣用30%乙醇120ml微波中火力档处理3.5min并于70℃浸提1h。     

叶子花红色素提取工艺的优化

本文研究了用树脂吸附和分离叶子花红色素，比较了4种树脂对叶子花红色素的吸附，在叶子花红色素提取过程中用AB－8树脂吸附，洗脱剂用40％的乙醇，洗脱效果好，且AB－8树脂使用20次后吸附性能仍稳定。     

红酵母色素的初步分离与鉴定

本文利用薄层层析法、分光光度法以及HPLC法对红酵母中的色素成分进行分离和初步鉴定，共分离出的四种组分，其中组分4可能是β-胡萝卜素，2和3可能是类胡萝卜素中的紫菌红素和丫-胡萝卜素，组分l属于非类胡萝卜素。     

火龙果色素的基本性质及结构鉴定

采用液质联用(HPLC/MS)的方法,将色素的不同组分分离,并对分离组分进行结构鉴定.结果表明:火龙果果肉、果皮色素同为甜菜苷类色素,从果肉中分离出4种甜菜苷色素为betanin,2 descarboxy betanin,phyllocactin,2 descarboxy phyllocactin;果皮中分离出2种甜菜苷色素为be tanin,phyllocactin.火龙果中甜菜苷红色素的质量分数分别为676.9mg/kg(以鲜果肉计),97.7mg/kg(以鲜果皮计).     

蓝莓不可萃取多酚的纯化及组分分析

对蓝莓果实中不可萃取多酚进行了提取、分离和纯化,并利用高效液相色谱对其组成成分进行了分析。结果表明,7种大孔树脂中HPD-100C对蓝莓不可萃取多酚的吸附率和解吸率都相对较高;采用大孔树脂HPD-100C进行动态纯化,再利用高效液相色谱分析其组分,得出蓝莓不可萃取多酚中主要物质为飞燕草色素、矢车菊色素、牵牛花色素、芍药花色素、锦葵色素,与可萃取多酚相似,说明两者具有相似组分。     

红酵母色素的初步分离与鉴定

本文利用薄层层析法、分光光度法以及HPLC法对红酵母中的色素成分进行分离和初步鉴定,共分离出的四种组分,其中组分4可能是-胡萝卜素,2和3可能是类胡萝卜素中的紫菌红素和-胡萝卜素,组分1属于非类胡萝卜素。     

NKA大孔树脂分离纯化桑椹红色素的研究

研究了NKA大孔吸附树脂分离纯化桑椹红色素的工艺条件。结果表明:NKA大孔树脂对桑椹红色素有较好的吸附分离性能,是分离纯化桑椹红色素的适宜大孔树脂;NKA型大孔树脂分离纯化桑椹红色素的最佳工艺条件为:以吸光度0.866Abs、pH值2.0的色素样液上柱;用pH值1.5、70%的酸性乙醇作洗脱剂,以0.5BV/h的洗脱流速进行洗脱。树脂重复使用8次后,吸附率仅降低2.8%。经纯化后的色素为紫黑色粉末,其色价为452,是未纯化的48.7倍。HPLC分析表明,桑椹红色素主要含两种花色苷。     

大孔树脂分离纯化米团花黄色素的研究

为寻找分离纯化米团花黄色素最佳工艺条件,对11种大孔树脂对米团花黄色素的静态吸附、解吸性能进行了比较研究,并确定了最佳吸附树脂D101对米团花黄色素动态吸附、解吸的最佳条件。结果表明:D101型大孔树脂分离纯化米团花黄色素的最佳工艺条件为:上样液浓度0.10~0.13 mg/mL,上样液pH 5,流速为1.5 mL/min;以60%(V/V)的乙醇洗脱,流速为3 mL/min。D101型大孔树脂的饱和吸附量为8.820 mg/g树脂,重复利用10次吸附量仍然很好。采用该工艺分离纯化得到的产品中米团花黄色素的含量为(1.9±0.0055)%,色价为27.93±0.80。     

辣椒色素的分离纯化与光学性质的研究

探索了吸附树脂柱色谱法脱除辣椒色素中辣椒素的新方法。该方法可将辣椒色素与辣椒素分离并对红、黄色素组分实现初步分离，辣椒色素产品色价高达105。用硅胶柱色谱法可分离辣椒色素精细组分。对所得色素精细组分进行了紫外-可见光谱分析表明：红色素组分的最大吸收波长为470nm，黄色素组分的最大吸收波长为450nm；各辣椒色素组分的光稳定性也存在较大的差异，为辣椒色素各精细组分充分而有效的利用提供了理论依据。     

罗非鱼皮色素的提取分离及其抗氧化作用研究

以清除DPPH自由基的能力为指标,研究罗非鱼皮色素抗氧化成分的提取工艺,探讨了提取物的分离纯化和抗氧化性能。结果表明,用柠檬酸预处理鱼皮,以甲醇为溶剂提取鱼皮色素提取率及其对DPPH自由基的清除率最高。在树脂吸附分离过程中,鱼皮色素在40 min内达到吸附平衡;吸附效率随样品浓度的增大而降低;丙酮洗脱鱼皮色素的解吸率最高;洗脱时间在20 min内达到解吸平衡;洗脱料液比为1∶2(mL/mL)时效果最优;上样流速在0.10 mL/min~0.20 mL/min范围内吸附效率达85%以上;解吸速度在0.15 mL/min~0.40 mL/min范围内解吸效率可以达到90%以上。鱼皮色素经树脂分离后,清除DPPH自由基的能力显著提高。X-5树脂对色素活性成分具有较强的吸附分离能力,有望应用于鱼皮色素中天然抗氧化成分的分离纯化。     

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