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1.
米糠半纤维素提取工艺参数的研究(Ⅰ)   总被引:2,自引:1,他引:1  
以工业脱脂米糖为原料提取米糠水溶性半纤维素及碱溶性半纤维素,是米糠综合利用的又一有效途径。提出了适合于工业化生产的分步提取途径。研究结果表明:水溶性半纤维素的最佳提取工艺参数为:料液比为1:10,3h,60℃;碱溶性半纤维提取工艺参数为:料液比为1:10,4h,25℃,碱液浓度为1.0N。在上述工艺条件下,水溶性半纤维素和碱溶性半纤维素的提取率分别为1.43%和9.02%《  相似文献   

2.
核蛋白和鱼精蛋白提取工艺的研究   总被引:2,自引:1,他引:1  
研究提取淡水鱼精巢中的核蛋白和鱼精蛋白的工艺条件,采秀正交试验法,通过筛选,确定了提取核蛋白的最佳工艺条件为:NaCl浓度为1.0mol/L,NaCl用量为10倍,提取时间1h,95%乙醇用量为2倍,提取鱼精蛋白的最佳工艺条件为:H2SO2浓度为5.0%,H2SO4用量为3倍,提取时间2h,95%乙醇用量为3倍。  相似文献   

3.
从玫瑰茄废弃细胞中提取食用纤维的研究   总被引:2,自引:0,他引:2  
朱新贵  郭勇 《食品科学》1998,19(4):20-22
从玫瑰茄废弃细胞中回收提取食用纤维,可以变废为宝,减少环境污染。从提取花青素以后的玫瑰茄细胞中可以回收平均8.0%的食用纤维,其中碱可溶性的半纤维素为3.9%,碱不溶性的纤维素为4.1%。  相似文献   

4.
魔芋果冻工艺研究   总被引:6,自引:1,他引:5  
将魔芋精 粉与海藻 酸钠混 合制成魔 芋果冻,对海藻酸钠 的浓度、魔 芋精粉 的浓度、凝 固剂的种类和浓度、酸 及缓冲剂 的种类 和浓度等 工艺条件进行了研究,得到最佳工艺配方为:海藻酸钠1 % 、魔芋精粉02 % ~03 % 、磷酸 钙或磷酸 氢钙02 % ~03 % 、柠檬酸030 % ~035 % 、焦磷酸钠或柠檬酸钠0 .2 % ,糖、香精和色素适量。  相似文献   

5.
玉米黄色素提取工艺的研究(一)   总被引:11,自引:0,他引:11  
对玉米黄色素的最佳提取溶剂进行了筛选,研究了原料玉米蛋白粉的处理方式,首次采用水解玉米蛋白粉的方法提取玉米黄色素。结果:96%乙醇对玉米黄色素的提取效果最佳;对原料玉米蛋白粉采用酶水解处理可使玉米黄色素的得率大幅度提高;确定了原料玉米蛋白粉酶水解的最佳工艺条件为:底物浓度5%,酶浓度:1.2%,温度:35℃,pH:7.4-8.0,水解时间:6h。  相似文献   

6.
玉米醇溶蛋白新型提取工艺的研究   总被引:7,自引:0,他引:7  
本文提供了一条玉米醇溶蛋白生产的新工艺路线,并论述了对提取与回收工艺过程及工艺参数的研究,确定了本工艺最佳工艺条件。最佳提取条件:液固比14∶1(m1/g),温度50℃,pH值9.0,时间2.0h;最佳回收条件:NaCl浓度1%,体积比1∶1。  相似文献   

7.
研究了以麦麸废渣为原料,采用碱液浸提法制备水不溶纤维素、碱溶性半纤维素的工艺条件.结果表明,碱浸法提取水不溶性半纤维素的最佳条件是:NaOH浓度为0.5 mol/L,浸提时间为3-4 h,浸提液温度为(35±5)℃;麦麸纤维素的提取条件为室温下NaOH的浓度为0.5-1.0mol/L.浸提时间为3.0 h.  相似文献   

8.
花菇多糖的提取工艺优化   总被引:10,自引:1,他引:9  
程超 《食品与机械》2006,22(1):33-34,68
采用中心组合实验对花菇水溶性和碱溶性多糖的提取工艺进行了优化。实验结果表明:花菇水溶性多糖的最佳提取条件为提取温度94.34℃,提取时间为3.5h,料液比为1:61.88,在此条件下花菇中水溶性多糖得率最高达到6.78%;花菇碱溶性多糖的最佳提取条件为碱NaOH浓度为1.816mol/L,提取时间为1.7h,料液比为1:60,此时花菇中碱溶性多糖得率最高可达到3.95%。  相似文献   

9.
目的:优选荷叶中荷叶碱、原花青素提取工艺。方法:采用正交实验设计,以原花青素、荷叶碱的提取率为指标,考察磷酸浓度、提取时间、料液比等因素对提取率的影响,优选最佳工艺参数。结果:以0.3%(V/V)磷酸为提取溶剂,料液比为1:25(g/L),提取时间1.5h,提取2次,原花青素的提取率为89.2%,荷叶碱的提取率为69.9%。结论:采用酸水法提取荷叶中荷叶碱、原花青素,具有提取效率高、工艺简便、成本低等特点,适合于工业化大生产应用。  相似文献   

10.
中心组合设计优化超声辅助酶法提取玉米须皂甙工艺研究   总被引:1,自引:0,他引:1  
为研究玉米须皂甙的超声辅助酶提取工艺,应用中心组合试验设计,采用DPS软件进行二次多项式逐步回归分析,对提取工艺条件进行优化,确定玉米须皂甙的超声辅助酶提取的最佳条件:超声作用温度50℃、乙醇浓度90%、纤维素酶添加量1.62%、超声作用时间30min,在此条件下玉米须皂甙提取率达2.24%。  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.
A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.  相似文献   

16.
Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH3CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH2PO4-20.6 mM Na2B4O7 buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.  相似文献   

17.
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   

18.
An investigation is described in which various polyfunctional compounds were applied to wool in attempts to stabilize the temporary improvements in wrinkle-recovery brought about by ‘annealing’. Several reactive systems involving formaldehyde were found to produce the desired permanently improved wrinkle-recovery.  相似文献   

19.
20.
The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.  相似文献   

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