首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 78 毫秒
1.
提高栀子果中栀子黄色素的提取率对后期栀子黄色素的精制及应用具有积极促进作用。该研究旨在建立一种从栀子果实中提取栀子黄色素的有效经济方法。通过超声辅助法研究栀子果实中粒度、提取时间、提取温度、提取剂浓度及液料比对栀子黄色素提取率的影响,基于单因素实验结果,采用五因素三水平的响应面法优化提取工艺,以提高栀子黄色素的提取率。结果显示,栀子黄色素的最佳提取工艺是提取时间31 min、提取温度62℃、液料比25∶1、乙醇浓度48%、粒度80目。采用响应面法优化后的提取工艺,栀子黄色素实际平均提取率为18.36%,与响应预测值18.38%相差0.02%,误差为0.19%,误差较小,说明该工艺具有良好的可靠性。与单因素实验相比,优化后的提取工艺将栀子黄色素的提取率从15.15%提高到18.36%,故优化后的工艺有利于栀子黄色素的提取,具有实际应用价值。  相似文献   

2.
微波-表面活性剂协同提取栀子黄色素的工艺   总被引:1,自引:0,他引:1  
以栀子为原料,研究微波-表面活性剂协同提取栀子黄色素,确定十二醇硫酸酯钠盐(K12)为栀子黄色素提取的最佳表面活性剂,通过正交试验确定最佳协同提取条件为:微波功率为420W,提取时间为90 s,十二醇硫酸酯钠溶液浓度为0.05%,提取料液比为1:20(g/mL).对比试验结果表明,采用该法栀子黄色素的提取率比仅用微波法提高了10.2%.  相似文献   

3.
通过正交试验对栀子黄色素提取工艺进行了优化,结果显示,采用40%丙酮作为提取剂、果实破碎度60目、浸提时间 30 min、浸提温度40 ℃、料液比1∶50、二次浸提是提取栀子黄色素的最优工艺条件.  相似文献   

4.
热回流法与微波辅助法提取栀子黄色素的比较   总被引:2,自引:0,他引:2  
探讨了栀子黄色素提取工艺中的热回流提取法和微波辅助提取法,并通过正交实验确定其相应的最佳工艺条件,并得出结论:微波辅助法与热回流法相比具有能耗低、操作方便、产品品质更高的优点。其最佳工艺条件为:提取功率为600W;乙醇浓度为30%;提取时间为3min;料液比为1∶8,在此条件下产品的色价为79.09,OD值为1.21。  相似文献   

5.
一次性分离纯化栀子黄和栀子苷的工艺研究   总被引:1,自引:0,他引:1  
目前我国所生产的栀子黄色素杂质含量高,不能达到出口标准。采用4因素3水平对低浓度60%乙醇提取栀子黄色素进行正交设计,以得出低浓度乙醇提取栀子黄的最佳工艺,进而利用HPD100A大孔树脂对栀子黄初液进行一次性分离纯化并对其工艺进行优化,最终得到低OD值比率(≤0.29)的栀子黄色素与高纯度(≥90%)的栀子苷。结果表明,该方法是一种切实可行、成本低、简便高效的工艺方法。  相似文献   

6.
栀子黄色素的提取及精制研究   总被引:1,自引:1,他引:0  
本文通过正交试验,确定了超声波法提取栀子黄色素的最佳工艺条件为:乙醇溶液60%、温度为45℃、提取时间20min。同时,本文对几种大孔树脂对栀子黄色素的精制条件和效果进行了研究。结果表明:D3520、D140树脂的精制效果较好,适合制备高色价的栀子黄色素。经D140树脂精制后的栀子黄色素的色价达到401,得率为1.80%;经D3520树脂精制后的栀子黄色素的色价达到434,得率为1.33%。二者比较,D3520精制的栀子黄色素的色价略高,OD比值略低,而D140树脂的吸附容量更大。  相似文献   

7.
栀子黄色素的提取及精制研究   总被引:1,自引:0,他引:1  
通过正交试验,确定了超声波法提取栀子黄色素的最佳工艺条件为:乙醇溶液60%、温度为45 ℃、提取时间20 min.同时,对几种大孔树脂对栀子黄色素的精制条件和效果进行了研究.结果表明:D3520、D140树脂的精制效果较好,适合制备高色价的栀子黄色素.经D140树脂精制后的栀子黄色素的色价达到401,得率为1.80%;经D3520树脂精制后的栀子黄色素的色价达到434,得率为1.33%.二者比较,D3520精制的栀子黄色素的色价略高,OD比值略低,而D140树脂的吸附容量更大.  相似文献   

8.
栀子黄色素是从栀子中提取的优良天然黄色素,具有一定的营养和保健价值,在食品加工业和饮料制造业中被广泛应用。对栀子黄色素的提取、分离方法和精制工艺等进行了简要综述,以期为栀子黄色素的开发提供一定的理论基础和依据。  相似文献   

9.
栀子黄色素纯化研究   总被引:8,自引:0,他引:8  
本文研究了从干栀子果中经抽提、萃取、层析法纯化栀子黄色素的工艺条件,栀子粉以70%的乙醇水溶液提取,再经正丁醇萃取除去栀子苷,粗品经聚酰胺层析分离出栀子素,纯化栀子黄色素的得率为4.54% ,A238/A440之比约0.2。  相似文献   

10.
天然色素在纺织品染色加工中的应用日益受到重视。分析了pH值、温度对栀子黄色素稳定性的影响,研究了真丝绸的栀子黄色素微波染色工艺,并与常规染色工艺进行了比较。结果表明,微波染色或微波媒染染色真丝绸的染色牢度与常规染色接近,而微波加热可以大大缩短染色时间,节能效果明显。  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   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号