艾蒿色素提取液的媒染染色研究

文中以水煮的方式提取艾蒿色素,并用该提取液对柞蚕锦纶复合丝针织物进行媒染染色,通过正交实验和单因素实验确定了艾蒿色素提取及媒染染色的最佳工艺条件.艾蒿色素提取最佳条件:温度90℃,水煮60 min,艾蒿与蒸馏水之比为1:20.硫酸亚铁预媒染色最佳条件:染液浓度为艾蒿提取原液浓度,温度80 ℃,时间40 min,pH值为7.硫酸亚铁后媒法处理最佳工艺条件:温度60℃,时间40 min,FeSO4·7H2O浓度6～g/L.以硫酸亚铁为媒染剂,染色织物的各项色牢度均达到3级或3级以上.     

超声波法提取苹果果实中类黄酮最佳条件研究

研究超声波法提取苹果果皮和果肉中类黄酮的条件。通过正交试验确定了最佳提取条件。果肉提取的最佳条件为提取温度70℃,乙醇浓度60%,料液比1∶25(g/mL),提取时间30 min。果皮中最佳条件为提取温度60℃,乙醇浓度60%,料液比1∶40(g/mL),提取时间20 min。并测定了3种品系中果皮和果肉中类黄酮的含量,测得果皮干物质中类黄酮的含量是果肉中的2倍～3倍。     

红松种壳中抗氧化性物质的提取研究

目的 研究红松种壳中提取有抗氧化性物质的最佳方法及工艺条件.方法 用不同溶剂、不同条件对提取的红松种壳内含物进行抗氧化实验.结果 以乙醇为提取溶剂,最佳条件为固液比1∶12、时间60 min、提取温度3 5℃.结论 红松种壳提取物具有抗氧化性.     

木芙蓉叶总黄酮提取纯化工艺的研究

目的 研究提取纯化木芙蓉叶总黄酮的工艺.方法 采用正交试验优选总黄酮的最佳提取条件并用聚酰胺纯化.结果 最佳提取条件为提取3次,乙醇浓度50％,料液比1∶10,提取时间1.5 h.聚酰胺纯化条件为上样浓度2.25 mg/mL,乙醇解吸浓度70％,解吸速率2 BV/h,洗脱液用量为2.5 BV.结论 利用本实验的优化工艺可使总黄酮纯度达到60％,工艺可行.     

微波-表面活性剂协同提取番薯天然紫色素的研究

紫心番薯色素(PPSP)为水溶性天然色素.本实验研究了PPSP的微波与表面活性剂协同提取以及大孔树脂的精制工艺条件.通过正交实验确定了最佳提取条件为吐温60与司班60混合比例2∶1(添加量为提取溶剂的1%),固液比1∶60,提取温度60℃,提取时间4min.最大提取率为0.781%.对比实验结果表明,该法与传统浸提法相比,提取率提高了30%,且提取时间仅为传统提取法的3%.     

菊花中黄酮类物质提取方法的研究

就水提法、醇提法、超声波法对菊花中黄酮类化合物的提取效果进行了比较,并使用正交实验确定了最佳提取条件。实验结果表明,菊花中总黄酮类物质的醇提法最佳提取条件为C3B3A1,即用1倍量80%的乙醇连续回流提取3次(每次2h);超声波法的最佳提取条件为:将样品置于60倍样品重的80%乙醇中浸泡24h,超声波提取15min。     

元宝枫单宁类化合物的提取研究

用不同种类、不同浓度的提取剂在不同的提取时间从元宝枫种壳中提取单宁,用络合法测定单宁含量, 通过比较得到最佳提取工艺条件为60%丙酮抽提时间为3h.在最佳条件下抽提单宁并通过IR图判断宁类型.     

胭脂树种子制备降红木素方法研究

本文研究了从胭脂树种子制备降红木素的方法,通过正交实验确定了最佳工艺条件。采用质量浓度为2%的氢氧化钾60%乙醇溶液作为溶剂时提取效果最好,其最佳工艺条件为:提取温度60℃,液料比(氢氧化钾溶液体积∶胭脂树种子质量,g/mL)3,提取时间为3h,提取2次,酸沉pH=3。本方法简便,收率高,适用于工业化生产。     

杜仲籽油的提取研究与应用

为了给杜仲耔油的综合开发利用提供理论依据,研究了提取杜仲籽油的最佳方法及最优条件,结果表明:杜仲籽油提取的最佳条件是:用石油醚为提取剂,物料比1:5,在60℃条件下提取2 h.杜仲耔油的收率为28.6%.     

不同方法提取丝瓜籽油的工艺研究

以丝瓜籽为原料,对丝瓜籽油的不同提取工艺和提取效果进行了比较.通过正交试验得到溶剂法最佳提取条件为:提取溶剂选用石油醚(b.p.60～90℃),提取时间为3 h,料液比为1:8(g:mL),提取温度为60℃,提取次数为2次,提取率为17.93%.超声波辅助法最佳提取条件为提取溶剂选用石油醚.超声时间为40min,超声功率为120 W,料液比为1:12(g:mL),超声温度为50℃,提取次数为2次,提取率为18.76%.结果表明,超声波辅助法提取的丝瓜籽油提取率高于溶剂提取法的提取率,并且比溶剂法提取的温度低、时间短,是一种短时高效的提取方法.     

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