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1.
以燕麦麸皮为原料,以提高燕麦麸多糖得率为目标,研究超声微波协同法提取燕麦麸多糖的最佳工艺条件。通过单因素实验探讨微波功率、液料比、pH和超声-微波协同时间对燕麦麸多糖得率及纯度的影响,并通过二次回归中心组合试验、响应面分析法确定燕麦麸多糖提取的最佳工艺参数。结果表明:最佳工艺条件为微波功率639W、液料比36∶1、pH10、超声-微波协同时间18min。与传统水提法相比,燕麦麸多糖得率从4.3%提高到8.45%。通过扫描电镜及红外光谱分析得出两种提取方法得到的燕麦麸多糖结构未发生改变。  相似文献   

2.
采用响应面法对花菇多糖进行微波萃取工艺研究.考察工艺参数——提取时间、微波功率、提取温度、液料比4个因素对花菇多糖得率的影响,用Design-Expert软件程序对实验数据进行二次响应面分析,同时做上述工艺参数的优化实验.实验结果表明:1)相较于热水浸提法与超声波法,微波提取法使多糖得率分别提高了1.02%和1.18%;当微波功率为700W时,其余3项工艺参数对花菇多糖提取得率的影响次序为提取时间>提取温度>液料比.2)优化的微波提取花菇多糖的工艺条件是:提取时间21 min,微波功率700W,提取温度88℃,液料比69.在该条件下花菇多糖得率8.80%,多糖二次萃取得率1.79%.  相似文献   

3.
研究微波法提取马尾松松针多糖的最佳工艺条件。先通过单因素试验考察微波功率、微波时间、料液比以及提取次数对松针多糖得率的影响;再通过正交试验确定提取松针多糖的最佳条件。结果表明,浸提次数是主要影响因素,其次是微波功率和料液比,微波时间对多糖得率影响较小。最佳提取条件为:微波功率800 W,微波时间150 s,料液质量体积比1:30(g/mL),浸提次数2次。此条件下松针多糖得率达3.92%。此法操作便捷、条件温和,易于工业化生产。  相似文献   

4.
采用微波法对姬松茸多糖进行提取工艺研究.以子实体粒度(目数)、料液比、微波功率、提取时间为考察因素,多糖得率为指标,采用正交实验法对多糖提取工艺进行优化.确定了微波提取的最佳工艺参数为:粒度(目数)为60目,料液比为1∶80(g/mL),微波功率为640W,提取时间为8min.按此优化条件,多糖得率可达9.04%,可显著提高姬松茸多糖的得率,工艺简单,成本较低.  相似文献   

5.
优化糜米多糖的微波辅助提取工艺。在单因素试验基础上,选取微波时间、微波功率和液料比为自变量,多糖得率为响应值,利用Design Expert 8.0.3.2软件,采用Box-Behnken设计试验和响应面分析方法研究各自变量及其交互作用对多糖得率的影响。结果表明:糜米多糖微波辅助提取的最佳工艺条件为微波辅助处理时间2.7min、微波功率640W、液料比35:1(mL/g)。在此工艺条件下多糖得率9.04%,与理论预测多糖得率9.17%的相对误差为1.42%。  相似文献   

6.
响应曲面法优化微波辅助提取平菇多糖工艺研究   总被引:4,自引:0,他引:4  
为优化平菇多糖的微波辅助提取工艺,在单因素试验的基础上,选择提取时间、微波处理功率以及液料比为自变量,多糖得率为响应值,应用Design Expert 7.1.6 软件技术,采用响应曲面法设计、分析研究各自变量及其交互作用对多糖得率的影响。利用响应面分析方法,模拟得到二次多项式回归方程的预测模型,并确定平菇多糖微波辅助提取工艺的最佳条件为提取时间10min、微波处理功率420W、液料比40:1(mL/g)。在此条件下,多糖得率达到9.04%。  相似文献   

7.
利用微波辅助提取法提取玫瑰花多糖。首先通过单因素试验选取影响因素与水平,在单因素试验基础上采用正交试验研究提取时间、微波功率、料液比对玫瑰花多糖提取效果的影响。以多糖得率为指标,确定微波辅助提取玫瑰花多糖的最优工艺条件,并与传统热水浸提法比较。结果表明,微波辅助提取玫瑰花多糖的最佳提取条件为:料液比1∶30(g/m L)、微波功率800 W、微波处理时间4 min,在此条件下,多糖得率达2.16%。与热水浸提法相比,微波辅助提取法具有提取时间短、提取率高等优点,该工艺可应用于玫瑰花多糖的提取。  相似文献   

8.
通过单因素试验分别考察粉碎粒度、料液体积质量比、提取温度、提取时间、微波功率和超声波功率对猴头菇多糖提取得率的影响,确定各因素的适宜水平。在单因素试验基础上,应用Box-Behnken试验设计和响应面分析法,探讨料液体积质量比、提取温度、提取时间和超声波功率对提取猴头菇多糖得率的影响。响应面优化结果表明,微波超声波组合提取猴头菇多糖的最优工艺为:粉碎粒度20目、液料体积质量比20 mL/g、提取温度74℃、提取时间16 min、微波功率200 W、超声波功率1 052 W。在最优工艺条件下,多糖得率为6.44%,非常接近预测值,说明所以优化的提取工艺参数可靠。体外抗氧化活性结果表明,微波超声波组合提取的猴头菇多糖抗氧化活性较高,对羟基自由基、DPPH自由基和超氧阴离子自由基清除作用显著,可以作为一种良好的天然抗氧化剂。  相似文献   

9.
试验以西兰花茎为原料,通过微波辅助酸法研究料液比、提取液pH值、微波功率和微波时间对西兰花茎果胶多糖得率的影响,并结合单因素试验和响应面分析法对提取工艺条件进行优化.结果显示4个因素对果胶多糖得率的影响均显著(p<0.05),其中提取液pH值和微波功率为极显著因素,影响因素大小顺序依次为提取液pH值>微波功率>料液比>...  相似文献   

10.
以单因素试验考察了微波功率、提取时间、提取温度、提取次数及料液比等因素对肠浒苔多糖提取量的影响,采用Design-Expert 8.0.5软件对微波辅助提取肠浒苔多糖的提取条件进行响应面法优化。结果表明,影响肠浒苔多糖微波辅助提取主要因素的主次顺序为:提取温度微波功率提取次数提取时间。肠浒苔多糖微波辅助提取的最佳工艺条件为:微波功率500 W,提取时间15 min,提取温度90℃,提取2次,料液比130(g/m L),粗多糖的得率为11.38%,该条件下测得的多糖含量为31.34%。可为肠浒苔多糖提取工艺的研究提供参考。  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   

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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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