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1.
以离子液体为提取剂,采用离子液体-超声波辅助提取黑豆异黄酮,考察提取温度、超声时间、[Bmim]Br(1-丁基-3-甲基咪唑溴盐)浓度、料液比对黑豆异黄酮提取率的影响;采用响应曲面法对提取工艺进行优化,与传统提取法进行比较,同时对异黄酮的抗氧化活性进行研究。结果表明,黑豆异黄酮的最佳提取条件为:离子液体浓度为0.75 mol/L、料液比1∶23(g/mL)、提取温度50℃、超声时间40 min。在此条件下黑豆异黄酮的提取率为0.419%,预测值和实际测定值接近,提取率高于传统提取方法;异黄酮对羟自由基的清除效果明显优于VC。响应曲面法优化离子液体-超声波辅助提取黑豆异黄酮稳定、可行。  相似文献   

2.
以离子液体为提取剂,采用离子液体-超声波辅助提取黑豆花青素,考察了提取温度、超声时间、离子液体浓度、料液比对黑豆花青素提取率的影响,采用响应曲面法对提取工艺进行优化,同传统提取工艺进行了比较。结果表明,最佳提取条件为:离子液体浓度0.9mol/L、料液比1∶51(g/mL)、提取温度44℃、超声时间45min。在此条件下黑豆花青素的提取率为4.118mg/g,预测值和实际测定值接近,提取率高于传统提取方法。响应曲面法优化离子液体-超声波辅助提取黑豆花青素稳定、可行。  相似文献   

3.
以离子液体为提取剂,采用超声波辅助离子液体提取黑豆异黄酮,考察1-丁基-3-甲基咪唑氯盐的浓度、料液比、超声时间以及提取温度对黑豆异黄酮提取率的影响。采用响应面法对提取工艺进行优化,同时对异黄酮的抗菌活性进行研究。结果表明,黑豆异黄酮的最佳提取条件为:离子液体浓度0.65 mol/L,提取时间49 min,料液比1∶21(g/mL),提取温度60℃。此条件下异黄酮的提取率为0.688%,预测值和实际测定值接近,为黑豆中天然异黄酮的开发利用提供科学数据。  相似文献   

4.
采用超声波辅助工艺提取葛叶中大豆异黄酮,采用响应曲面法对提取工艺进行优化。通过对提取时间、提取温度、液料比、颗粒度等4个工艺条件对大豆异黄酮提取率影响的考察,然后在单因素的基础上进行响应面分析。由响应面分析软件分析,得知超声波辅助提取葛叶中大豆异黄酮的最佳工艺条件:提取时间38 min、提取温度60℃、液料比1∶25 g/mL、颗粒度50目。在此条件下得到的最佳提取率为黄酮0.117%,与RSM模型预测值无显著性差异。  相似文献   

5.
为高效获得花青素,采用离子液体-微波辅助提取黑豆皮中的花青素,考察提取时间、提取温度、微波功率、离子液体浓度、料液比对提取量的影响,采用响应曲面法对提取工艺进行优化。结果表明,最佳提取条件为提取时间45min,离子液体浓度0.7 mol/L,料液比1∶30(g/mL),微波功率460 W,提取温度49℃。在此条件下,花青素的提取量为4.834 mg/g,预测值和实际测定值接近,可以为黑豆皮花青素后续的利用和研发提供参考。  相似文献   

6.
以产于吉林的黑豆为材料,采用超声波法对黑豆异黄酮的提取工艺进行了研究.在单因素实验结果基础上,选择液料比、提取时间、温度进行三因素三水平的中心组合设计实验,利用Design-expert软件进行响应面分析.超声波法提取黑豆异黄酮的最佳工艺参数为:液料比46∶1 (mL/g)、提取时间51 min、提取温度52℃,异黄酮提取率实测值为1.883%,预测值为1.891%,理论值与预测值相差甚小,可确定利用响应面优化异黄酮提取的工艺参数可靠,并有一定的应用价值.与振荡提取方法相比,超声波提取法具有高效、省时、节能等优点.同时在最佳提取工艺条件下测定了其他四个产地的黑豆异黄酮含量,结果表明,产于吉林的黑豆异黄酮含量最高,产于山西的黑豆异黄酮含量最低.  相似文献   

7.
响应面法优化超声辅助提取茶渣蛋白质的工艺条件   总被引:1,自引:0,他引:1       下载免费PDF全文
以茶渣为原料,采用超声波技术辅助提取茶渣蛋白质,考察了超声功率、超声频率、超声温度、超声时间、碱液浓度、料液比对茶渣蛋白质提取率的影响,并以响应曲面法优化工艺条件;比较分析了超声辅助碱提和热水浴碱提茶渣蛋白质提取率的差异。结果表明,超声波辅助提取茶渣蛋白质最佳提取工艺条件为:超声功率300 W、超声频率为26Hz、超声温度54℃、超声时间61min、碱液浓度0.35mol/L、料液质量比比1g∶27mL,在此条件下,茶渣蛋白质一次提取率为86.50%,超声碱提相对于热水浴碱提,一次提取率提高了37.2%。  相似文献   

8.
以离子液体为提取剂,采用离子液体超声波辅助提取黑豆皮花青素,考察了提取温度、提取时间、离子液体浓度、料液比对黑豆皮花青素得率的影响,采用响应曲面法对提取工艺进行优化,同时对花青素的体外抗氧化活性进行研究。结果表明,最佳提取条件:离子液体浓度0.9 mol/L,料液比1∶53(g∶mL)、提取温度43 ℃、提取时间45 min。在此条件下黑豆皮花青素的得率4.12 mg/g。花青素对羟自由基的清除效果在一定范围内优于维生素C。  相似文献   

9.
余安  王承明 《食品科学》2010,31(10):179-183
用响应面法研究超声波辅助提取花生粕中植酸的最佳工艺,考察超声温度、超声时间、超声功率、液料比和盐酸浓度5 个因素对植酸提取率的影响。经响应面优化的超声波辅助提取植酸的优化工艺条件:超声温度40℃、超声时间24min、超声功率72W、液料比11:1(mL/g)、盐酸浓度0.01mol/L,此时提取率为1.48%,与模型预测值1.44% 相差不到3%。实验结果说明超声波方法可较好地应用于花生粕中植酸的提取,同时得到一个能较好预测实验结果的提取模型方程。  相似文献   

10.
对提取蒜台中总黄酮的工艺条件进行响应面优化,旨在获得更高的提取率。在单因素试验的基础上,进行超声波辅助提取蒜台中总黄酮工艺的响应面优化,以乙醇浓度(%)、料液比(m L·g~(-1))、超声温度(℃)和超声时间(min)四个参数为自变量,以总黄酮的提取率为响应值,采用Box-Behnken试验设计方法,研究各自变量及其相互作用对总黄酮提取率的影响。超声波辅助提取蒜台中总黄酮的响应面优化得到最佳提取工艺条件为:81%的乙醇浓度、51 m L·g~(-1)的料液比、61℃的超声温度、105 min的超声时间,此条件下蒜苔总黄酮提取率为0.6799%,影响提取的因素为:乙醇浓度>超声时间>料液比>超声温度。响应面方法建立的模型有效,超声波辅助提高了提取率,为蒜台中总黄酮的提取提供参考。  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

15.
BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H2O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.  相似文献   

16.
17.
A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.  相似文献   

18.
19.
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.  相似文献   

20.
<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  相似文献   

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