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1.
郭雷  陈宇 《食品科学》2010,31(14):53-57
以浒苔为原料,采用微波技术辅助提取其多糖。通过单因素试验和响应面设计法,确定浒苔多糖微波辅助提取技术的最佳工艺条件为微波温度95℃、微波功率800W、微波时间32min、液料比78:1(mL/g)。按此工艺条件提取多糖,得率为4.04%。  相似文献   

2.
响应面法优化微波辅助提取浒苔多糖工艺   总被引:2,自引:0,他引:2  
将微波技术应用于浒苔多糖的提取,利用响应面法优化提取工艺。在单因素试验基础上,以微波功率、料液比以及提取时间为自变量,多糖提取率为响应值进行中心组合设计,根据回归分析得出最佳提取条件如下:微波功率610 W,料液比1∶62(g∶mL),提取时间11 min,在此条件下,浒苔多糖提取率达到7.58%。实验结果表明,微波辅助提取工艺简便易行,为浒苔多糖的提取提供一定的理论参考。  相似文献   

3.
目的:优选超声波法辅助提取浒苔多糖的工艺条件。方法:在单因素试验的基础上,采用正交设计,对超声波辅助提取浒苔多糖的工艺条件进行优选。结果:优选的浒苔多糖超声波辅助提取工艺条件为超声波功率800W、超声处理时间45min、料液比1∶30,浒苔多糖的提取率为27.99%;超声处理的三因素中,处理时间影响最大(P〈0.01),其次是超声波功率(P〈0.05);超声波辅助提取法比单纯热水浸提法,浒苔多糖得率提高了2倍,提取时间缩短了60%。结论:超声波法辅助提取浒苔多糖具有操作简便、多糖提取率高、提取时间短的优点,在浒苔多糖产业化生产中有应用前景。  相似文献   

4.
郭雷  陈宇 《食品科学》2010,31(16):117-121
为优化浒苔多糖的提取工艺条件,采用超声辅助提取技术提取浒苔多糖,考察3 个变量(超声温度、超声时间和液料比)对浒苔多糖收率的影响,并通过响应面设计法确定浒苔多糖超声辅助提取技术的最佳工艺条件。结果表明:最佳工艺条件为超声温度80℃、超声时间28min、液料比63:1(mL/g),按此工艺条件提取浒苔多糖,收率为25.84mg/g;验证实验表明,实际浒苔多糖收率与模型预测值相近。采用响应面法优化浒苔多糖超声辅助提取工艺可行。  相似文献   

5.
浒苔多糖超声波提取工艺的研究   总被引:1,自引:0,他引:1       下载免费PDF全文
本文对浒苔多糖的超声波提取工艺进行了研究.通过Box-Benhnken试验设计,选取液料比、超声功率和提取时间作为优化因素,采用响应面分析法对浒苔多糖的超声波提取工艺进行了优化.结果显示,超声波提取浒苔多糖的最佳工艺条件为:液料比54.81∶1,超声功率531.17W,提取时间为272 s.在此条件下,浒苔多糖的提取率...  相似文献   

6.
高速剪切辅助提取浒苔多糖的工艺研究   总被引:1,自引:0,他引:1  
采用高速剪切辅助提取技术,研究了剪切时间、转速、液料比和剪切次数对浒苔多糖得率的影响,并对不同提取方法进行了比较。在单因素实验的基础上,通过正交实验确定最佳提取工艺条件为液料比50∶1、转速12000r/min、剪切时间80s和剪切次数3次。高速剪切辅助提取工艺简便易行,为浒苔多糖的提取提供一定的理论参考。  相似文献   

7.
以猕猴桃根为原料,研究其多糖的微波辅助提取工艺条件。采用单因素试验和正交试验,探讨料液比(猕猴桃根粉:蒸馏水)、提取温度、提取时间、微波功率等对猕猴桃根多糖提取率的影响,并以提取率为评价指标,优化提取工艺。实验结果表明:微波辅助提取猕猴桃根多糖的最佳工艺条件为料液比1:20(g/mL)、提取温度60℃、提取时间15min、微波功率600W,在此条件下猕猴桃根多糖的提取率为11.34%。  相似文献   

8.
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   

9.
微波法辅助提取玉竹多糖的工艺   总被引:1,自引:0,他引:1  
以玉竹为原料,研究其多糖的微波辅助提取工艺条件。采用单因素试验和正交试验,对料液比[玉竹粉∶水(g∶mL)]、提取次数、醇沉浓度、提取时间、微波功率等因素对玉竹多糖提取率的影响,并以提取率为评价指标,确定优化提取工艺条件:醇沉浓度85%,提取时间10 min,微波功率400 W,提取次数2次,料液比1∶20(g∶mL)为最佳工艺条件,在此条件下玉竹多糖的平均提取率为3.76%。  相似文献   

10.
为探讨车前草多糖提取率的影响因素,本实验利用微波辅助提取法,以车前草多糖提取率为指标,通过对料液比、微波功率、微波处理时间、浸提温度进行单因素实验,并在此基础上进行正交实验。结果表明,影响车前草多糖提取率的因素顺序为:微波处理时间>料液比>浸提温度>微波功率。车前草多糖的最佳提取工艺为料液比1∶25(g/mL)、微波功率为450W、微波处理时间4min、浸取温度为70℃。在此条件下,车前草多糖的提取率为9.41%±0.23%。该法提取的车前草多糖提取率高,且节省时间。  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   

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17.
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   

18.
<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   

19.
《印刷工业》2014,(11):95-95
According to Printing and Printing Equipment Industries Association of China(PEIAC)'s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.  相似文献   

20.
《印刷工业》2014,(8):103-103
正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press  相似文献   

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