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1.
超临界CO2萃取花椒油树脂的研究   总被引:1,自引:0,他引:1  
王家良 《中国调味品》2007,(2):39-41,46
研究了萃取花椒油树脂的工艺,通过单因子实验和正交实验优化了超临界CO2萃取花椒油树脂的最佳工艺条件:原料粒度60目,流量25L/h,萃取时间2h,温度40℃,压力20MPa。  相似文献   

2.
采用超临界流体萃取技术萃取花椒油脂,通过单因素试验和正交试验设计,研究花椒粉粒度、萃取压力、萃取时间和萃取温度等因素对花椒油脂的萃取率的影响,找到最佳的工艺条件。研究结果表明最佳工艺参数为花椒粉粒度60目、萃取压力15 MPa、萃取时间1.5 h、萃取温度45℃、CO2流量5 L/h~10 L/h。在此条件下,花椒油脂的萃取率可达12.27%以上。影响提取率的主次因素为萃取温度萃取压力萃取时间。  相似文献   

3.
超临界CO2提取与分离花椒油树脂的研究   总被引:2,自引:0,他引:2  
花椒是我国特有的、资源丰富的一种调味品和中药原料,对其精深加工具有重要的现实意义.通过单因素和正交实验确定了超临界CO2萃取花椒油树脂的最佳工艺条件为原料粒度40目,萃取时间2 h,流量25 kg/h,温度45℃,压力32 MPa,油树脂得率12.63%.采用超临界CO2分离花椒油树脂中挥发油的适宜工艺条件为分离器Ⅰ的分离压力12MPa,温度40℃.分离器Ⅰ花椒油树脂得率为1.2%,其中挥发油含量为15.7%.实验结果表明,采用此工艺可有效地提取与分离花椒油树脂.  相似文献   

4.
超声波—微波协同萃取姜辣素的工艺研究   总被引:1,自引:0,他引:1  
研究超声波-微波协同萃取姜辣素的工艺条件。以生姜粉为材料,通过单因素和正交试验探讨超声波-微波协同萃取姜辣素的工艺条件中溶剂种类、乙醇浓度、微波功率、微波处理时间、料液比及超声波等因素对萃取效果的影响。最佳工艺条件:70%乙醇为溶剂;料液比1:12.5(W:V);超声波250W微波协同处理60s,姜辣素的提取率达到1.843%,处理后物料经70℃热回流提取2h,姜辣素的提取率可达到3.262%,是直接热回流提取2h的1.5倍。  相似文献   

5.
研究超临界CO2萃取花椒油的最优工艺条件。通过单因素实验考察了萃取温度、萃取压力和萃取时间对花椒油萃取率的影响,采用响应面法进行优化。结果表明:花椒油最优萃取工艺条件为萃取温度42℃、萃取压力19. 8 MPa、萃取时间90 min,在此条件下花椒油平均萃取率为16%。  相似文献   

6.
超临界CO2萃取花椒油的工艺研究   总被引:12,自引:0,他引:12  
本文研究了超临界CO2萃取花椒油的工艺,探讨了萃取压力、温度、时间对萃取率的影响。通过正交试验得到最佳萃取工艺条件为:萃取压力20MPa、萃取温度46℃、萃取时间6h。  相似文献   

7.
李俶  倪永年  李莉 《食品科技》2006,(10):94-97
采用超临界CO2萃取、酸水溶液提取、超声波辅助浸提等3种方法提取槲寄生碱。结果表明,超临界CO2萃取的最佳工艺条件是A2B1C1D3,即温度50℃,压力25MPa,时间1h,夹带剂氯仿;酸水溶液提取的最佳工艺条件是1.5%的盐酸回流提取6h;超声波辅助浸提的最佳工艺条件是A1B2C2,即乙醇体积分数100%,超声时间30min,固液比30∶1。  相似文献   

8.
花椒麻味成分的提取与分离技术   总被引:4,自引:0,他引:4  
花椒是我国特有的、资源丰富的一种调味品和中药原料 ,辛麻味是其主要的风味特征。文中通过单因素和正交试验确定了超临界CO2 萃取花椒麻味成分的最佳工艺条件为 :原料粒度 60目 ,萃取时间 2h ,流量 2 1kg/h ,温度 5 5℃ ,压力 3 6MPa,油树脂得率达 1 2 83 %。采用超临界CO2分离花椒油树脂中麻味成分的适宜工艺条件为 :分离器Ⅰ分离压力 1 2MPa,温度 40℃。分离器Ⅰ花椒油树脂得率为 1 85 % ,其中挥发油含量为 60 0 2 8mg/g。试验结果表明 ,采用此工艺可对花椒麻味成分进行有效地提取与分离  相似文献   

9.
花椒油醇提工艺优化及水提醇提成分分析比较   总被引:2,自引:0,他引:2  
文章对花椒油乙醇提取工艺参数进行优化,并对水提和醇提花椒油进行成分分析比较。利用正交实验法,以花椒油提取率为考察指标,对试剂浓度、提取温度、提取时间进行研究,并利用气相色谱-质谱联用仪对醇提和水提的花椒油进行成分分析。经实验选择最佳提取工艺条件为乙醇浓度为95%,提取温度为50℃,提取时间5 h,最高提取率12.33%;通过分析,醇提花椒油含量高成分简单,水提花椒油含量低成分复杂,两者成分相差较大。花椒油提取率比优化前有很大提高,水提醇提花椒油成分差异大。  相似文献   

10.
研究了从花椒中提取制备高纯花椒油素的方案。采用同时蒸馏萃取(SDE)提取花椒油素,利用硅胶柱色谱分离得到粗品,经过重结晶纯化得高纯花椒油素,利用核磁共振(NMR)和反相高效液相色谱(RP-HPLC)进行定性和定量分析。在SDE过程中,料水比为1:10,溶剂(无水乙醚)用量为60 m L,提取时间为1.5 h时,粗提物中花椒油素含量达47.26%。以洗脱液配比(乙酸乙酯:石油醚)为1:15、径高比为1:12、样品与硅胶质量比(上样量)为1:40、洗脱液流速为4 m L/min的硅胶柱分离得到花椒油素粗品(纯度81.79%),回收率达99.12%。最后通过重结晶获得高纯花椒油素(纯度98.23%),总回收率达90.63%,得率为0.88%。NMR分析证实晶体确为花椒油素。该方案可实现从花椒中高回收地制取高纯花椒油素,为拓宽花椒的精深加工提供参考。  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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