碱溶性菜籽多糖的提取条件优化及体外抗氧化活性研究

本实验采用氢氧化钠提取菜籽饼粕中的多糖,选定提取温度、浸提液浓度、提取时间三因素三水平进行中心组合试验,建立了菜籽多糖提取的二次回归方程。通过SAS软件做响应面分析以及岭嵴分析得到菜籽多糖氢氧化钠提取的最佳条件。试验结果表明,当提取工艺条件为:提取温度93.7℃,浸提液浓度1.124mol/L,提取时间2.3h,其多糖含量为11.59%。并对碱溶性菜籽多糖进行了体外抗氧化活性研究,表明菜籽多糖有一定抗氧化生物活性。     

碱提紫苏饼粕多糖的工艺优化

采用碱液提取紫苏饼粕中多糖,从浸提液浓度、提取温度、提取时间、液固比4个方面对得率进行了考察。通过正交实验,得出紫苏饼粕多糖氢氧化钠提取的最佳条件:浸提液浓度为5mol/L,提取温度为80℃,液固比为20∶1(mL/g),提取时间为3 h,在此条件下多糖得率为5.57%。     

碱溶性油茶籽饼粕多糖的提取工艺研究

采用油茶籽饼粕为原料,先用热水浸提,再进一步用减法提取碱溶性油茶籽饼粕多糖,应用正交试验优化碱溶性油茶籽饼粕多糖的提取工艺。在单因素分析的基础上,研究不同料液比、温度、碱浓度、时间对多糖得率的影响。结果表明：碱溶性油茶籽饼粕多糖提取的最佳工艺条件是料液比为1：30,提取温度为90℃,碱浓度为0.4mol.L-1,提取时间为2h。在此条件下多糖得率达到8.25%。     

超声提取菜籽饼粕多糖的方法研究

本文采用超声提取法，从菜籽饼粕中提取多糖，用苯酚-硫酸比色法测定菜籽多糖含量。探讨了影响多糖提取率的主要因素（提取时间、料液比、次数），并用正交设计实验确定最佳提取工艺。结果表明：超声提取饼粕中多糖的最佳工艺为时间75min，料液比为1：40，次数为2，多糖产率为1、99％；超声法具有提取时间短、节省溶剂、提取率高的特点。     

响应面分析法优化菜籽多糖酸法提取工艺的研究

利用响应面分析法对菜籽多糖的酸法提取工艺进行了优化。在单因素试验的基础上,选取酸浓度、料液比、提取时间、提取温度进行了4因素3水平的Box-Behnken中心组合研究,并运用Design Expert 7.0软件对试验数据进行分析。建立了以上4个主要因素对酸提菜籽多糖得率影响的数学模型,并通过响应面分析法对提取条件进行了优化,确定了酸法提取菜籽多糖的最佳工艺。试验结果表明,各提取因素对酸提菜籽多糖得率的影响顺序为:提取温度>酸浓度>提取时间>料液比。所得最佳提取条件为:酸浓度0.28 mol/L、料液比43.05 mL/g、提取时间5 h和提取温度71.9℃,在此条件下预期的多糖得率是4.07%,实际得率为4.01%。     

菜籽饼粕中植酸新提取方法研究

本文研究了沉淀剂法直接从菜籽饼粕中提取植酸。结果表明：碳酸钠、磷酸钠和草酸盐等三种沉淀剂中，以草酸盐溶液提取植酸的效果最好；当以草酸盐为提取剂时，提取最佳工艺条件为草酸盐浓度为0．05mol／L、pH为6．5-7．5、料液比为1：8-1：10、温度为30℃、浸提时间为3h。本文还详细地探讨了沉淀剂法提取菜籽饼粕中植酸的原理。     

离子沉淀法制备菜籽饼粕中多酚的工艺

为提高菜籽饼粕的综合利用价值,采用热水浸提结合离子沉淀的方法,对菜籽饼粕中的多酚类物质进行提取纯化,并制备出菜籽多酚。在单因素试验的基础上,通过正交试验得到的最佳浸提工艺条件为浸提温度50℃、浸提时间75min、液料比13:1、浸提2次;浸提液离子沉淀的较适参数组合为氯化锌为沉淀剂、沉淀剂用量为粗提液中多酚质量的1.5倍、pH6.0,在此工艺条件下,获得的菜籽多酚成品为淡黄色粉末,得率1.66%,纯度90.03%。     

树舌灵芝菌丝体多糖提取条件的研究

对树舌灵芝菌丝体粗多糖的提取条件进行研究,通过单因素试验和L9(34)正交试验设计等方法,重点考察不同的浸提剂、浸提温度、料液比、浸提时间、乙醇沉淀倍数对树舌灵芝多糖提取率的影响.结果表明,最佳提取条件为:浸提剂为氢氧化钠(4%),料液比为1:30(g/mL),温度为80℃,时间为4h,乙醇沉淀体积为3倍,多糖提取率为4.022%.     

正交试验法优选坛紫菜多糖的提取工艺

目的：对常规法提取紫菜多糖的工艺进行优化；方法：L16（4^4）正交试验及方差分析；结果：影响紫菜多糖热水提取的主要因素为醇沉浓度，其次是浸提时间，再次是浸提温度和料液比；结论：常规法提取紫菜多糖的优选方案为浸提温度80℃、浸提时间1．5h、料液比1：20、醇沉浓度90％。     

响应面法优化水提菜籽多糖工艺

研究了从菜籽粕中水提菜籽多糖的工艺。在单因素试验的基础上,以提取温度、提取时间与料液比为因素,以菜籽多糖得率为指标,采用响应面法优化菜籽多糖的提取工艺。结果表明:在提取温度80℃、提取时间3.4 h、料液比1∶34、提取1次的条件下,菜籽多糖得率为2.09%。     

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