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.
甜樱桃红色素的提取与纯化工艺研究   总被引:1,自引:0,他引:1  
采用正交试验法研究了甜樱桃红色素的最佳浸提条件,并采用AB-8大孔吸附树脂对甜樱桃红色素进行分离纯化。结果表明,温度对甜樱桃红色素浸提效果的影响最大,其次为料液比、浸提次数及时间,较佳的浸提工艺条件为料液比1:6、温度40-60。C、浸提2次、每次浸提15min。AB-8大孔树脂吸附法可以有效纯化甜樱桃红色素,提高色素质量。  相似文献   

2.
大孔树脂纯化茶皂素的研究   总被引:1,自引:0,他引:1  
以脱脂油茶饼粕80%乙醇浸提液为原料,考察了不同大孔树脂对茶皂素液的纯化效果,确定用AB-8树脂进行纯化。研究得出较佳吸附条件:上样液中茶皂素浓度34.4mg/mL、吸附温度25℃、吸附时间100min;较佳脱附条件:脱附温度30℃、洗脱液乙醇浓度80%、洗脱液与上样液体积比4:1、脱附时间80min,在此条件下茶皂素的吸附率90.70%、总洗脱率85.47%,产品纯度85%。  相似文献   

3.
卜晓英  卜小庆  杨勇 《食品科学》2014,35(22):104-108
研究分离纯化及喷雾干燥化蘘荷红色素的工艺条件。比较10 种大孔吸附树脂对红色素的静态、动态吸附与解吸效果,红色素纯化液经真空浓缩后用喷雾干燥法制备红色素的粉末。结果表明:LSA-21大孔吸附树脂分离纯化蘘荷红色素效果好,其工艺条件为上柱液pH 5.0、上样液质量浓度3.85 mg/mL、吸附流速2 BV/h,以酸性蒸馏水为解吸剂,解吸流速3 BV/h;喷雾干燥工艺条件为加入待喷液质量分数2%的可溶性淀粉,调整可溶性固形物质量分数达到 12%~14%、进料速率3.0~4.0 kg/h、进口风温度 174~177 ℃、出口风温度 65~71 ℃、排风速率 0.34~0.38 m3/min、雾化压强100 kPa。红色素粉末经薄层层析色谱与高效液相色谱检测均由3 种单体构成。  相似文献   

4.
通过L9(34)正交实验优化金樱子棕色素的浸提工艺,并采用超滤膜和大孔吸附树脂进行分离和精制。研究结果表明,最佳浸提工艺为:浸提温度70℃,乙醇浓度60%,提取时间2h,料液比1∶6。AB-8为色素分离纯化的最佳吸附树脂,最佳吸附条件为:pH4.0,吸附流速2.5mL/min,吸附时间2h;最优洗脱条件为:70%乙醇、洗脱流速1.5mL/min,洗脱时间10~20min。经超滤和大孔吸附树脂吸附后,色素色价比未精制的高6.3倍。  相似文献   

5.
陈美红  徐玉娟  李春美 《食品科技》2007,32(10):178-182
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。  相似文献   

6.
以胭脂虫干体为原料,通过粉碎、浸提、树脂吸附、解吸浓缩、冷冻干燥等得到胭脂虫红色素粉末.以色素的吸光度值为指标,通过比较提取率的高低,对提取温度、提取时间、料液比、提取次数等因素进行了研究,确定胭脂虫红色素的最佳提取工艺条件为:提取温度85℃、浸提时间2h、料液比为1:60、提取次数为2次.通过静态吸附和解吸实验确定最佳的纯化树脂为S-8大孔吸附树脂.再通过静态和动态吸附、解吸实验对吸附率和解吸率进行研究,确定胭脂虫红色素的最佳纯化工艺条件为:上柱浓度为0.750×15、流速为2BV/h、pH为4;洗脱剂为pH2的60%的乙醇、洗脱流速为2BV/h.通过最佳提取工艺提取、最佳纯化工艺纯化、冷冻干燥得到色素粉末,其色价为102,胭脂虫红酸的含量达到了70.93%.  相似文献   

7.
唐晓丹  张伟  丛景香  王绍艳 《食品科技》2011,(3):155-158,163
采用单因素实验和L9(33)正交实验设计,考察了浸提溶剂、料液比、浸提时间、浸提温度和浸提次数对黄蘑多糖提取率的影响,确定最佳提取工艺。采用Sevage法除蛋白,乙醇反复沉淀,AB-8大孔吸附树脂纯化黄蘑多糖。结果表明:影响多糖提取率的主次因素为浸提时间、浸提温度及料液比;黄蘑多糖最佳提取工艺条件:料液比1∶25,浸提温度90℃,浸提时间3h。在此工艺条件下,黄蘑多糖提取率为30.48%。纯化后的多糖含量为91%,分子量约为104356。  相似文献   

8.
以酿酒用葡萄为原料,研究提取、分离白藜芦醇的方法与条件,建立了最佳提取工艺与纯化工艺.以酒葡萄皮为原料,采用超声波辅助法和有机溶剂的提取,得到白藜芦醇的粗提液.正交试验表明,采用60%甲醇溶液作为溶剂,最佳提取条件为浸提温度60℃,浸提时间40 min,料液比为1:40,浸提2次.以NKA-Ⅱ、NKA-9和D101 3种大孔吸附树脂做为吸附剂,柱层析法纯化白藜芦醇,结果表明,NKA-9大孔吸附树脂填充的色谱柱为最佳吸附树脂,动态饱和吸附量约为2-31 mg/mL湿树脂;解吸采用75%甲醇,解吸流速1 mL/min,pH值8,可较好纯化白藜芦醇.  相似文献   

9.
葡萄籽中原花色素提取和分离的初步研究   总被引:2,自引:0,他引:2  
对葡萄籽中原花色素的提取、分离工艺进行了初步研究。通过对不同提取剂的比较得出,用丙酮粗提效果最好。并通过单因素试验和正交试验得出最佳提取条件(温度60℃、浸提时间60min、浸提剂浓度50%、料液比1:6),对最佳提取条件下提取的粗提液利用大孔吸附树脂进行分离。比较了不同吸附树脂和不同流速的吸附解吸情况。  相似文献   

10.
本论文研究了用热水浸提洋葱总黄酮的提取纯化工艺,为工业化生产提供实验依据和技术支持。通过单因素及正交实验探讨了提取温度、提取时间、料液比对浸提效果的影响,确定最佳提取工艺条件为:浸提温度40℃、料液比1:4、浸提时间5h,在此工艺条件下提取得到的总黄酮占洋葱鲜重0.17%。通过静态吸附及解吸实验、动态吸附及解析实验,研究了ADS-5、ADS-8、ADS-17、HP-20四种大孔吸附树脂对洋葱总黄酮的吸附及解析性能,结果表明:ADS-8的分离纯化效果最好,吸附率为86.45%,解吸率为97.07%。  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