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普鲁兰酶对木薯淀粉糖化的影响 总被引:1,自引:0,他引:1
普鲁兰酶对木薯淀粉糖化的影响¥华南理工大学@温其标@陈玲@罗发兴@颜盛发@张力田普鲁兰酶对木薯淀粉糖化的影响华南理工大学(510641)温其标陈玲罗发兴颜盛发张力田1前言在淀粉糖工业和许多食品发酵工业中都以淀粉为原料,经水解制成葡萄糖作为工厂的产品或者半成... 相似文献
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酶法制备抗性淀粉新工艺的研究 总被引:2,自引:0,他引:2
以普通玉米淀粉为原料,采用121℃20min压热--℃24h冷却的循环处理和酶解处理相结合的方法制备抗性淀粉,对压热-冷却循环次数和普鲁兰酶的添加顺序及酶作用时间进行研究.结果表明,在选定的酶用量(30U·mL-1)和酶作用温度(60℃)条件下,压热一冷却循环结合酶水解法,即糊化或老化1次后添加普鲁兰酶,可以显著提高普通玉米淀粉制备抗性淀粉的得率.并且老化1次后加入普鲁兰酶的作用效果更好. 相似文献
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《中国食品添加剂》2016,(10)
麦芽四糖是一种新型麦芽低聚糖,具有易消化吸收、低甜度、高黏度、保湿性好、吸湿性低、抗龋齿、增稠作用强、冰点作用小、低渗透压、防止食品中蛋白质变性等特点,广泛应用于食品行业、饲料行业、造纸行业及及生化试剂分析行业等。以本公司自制的淀粉液化液为原料,通过对液化液DE值、糖化温度、糖化p H、糖化时间、普鲁兰酶添加量及麦芽四糖酶添加量的研究发现,普鲁兰酶与麦芽四糖酶协同作用效果比较明显,它们的共同使用可以明显提高麦芽四糖含量。通过对DE值、糖化温度、糖化p H作正交试验表明,影响麦芽四糖含量各因素的主次关系依次是DE值、糖化温度、糖化p H;在底物浓度27%,普鲁兰酶添加量为0.5ml/L,麦芽四糖酶添加量为0.4ml/L,DE值为5,糖化温度为55℃,糖化p H 5.5时,麦芽四糖含量最高,为57.42%。 相似文献
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以普通玉米淀粉为原料,采用121℃20min压热——4℃24h冷却的循环处理和酶解处理相结合的方法制备抗性淀粉,对压热-冷却循环次数和普鲁兰酶的添加顺序及酶作用时间进行研究。结果表明,在选定的酶用量(30U.mL-1)和酶作用温度(60℃)条件下,压热-冷却循环结合酶水解法,即糊化或老化1次后添加普鲁兰酶,可以显著提高普通玉米淀粉制备抗性淀粉的得率,并且老化1次后加入普鲁兰酶的作用效果更好。 相似文献
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为了考察不同淀粉质原料对出芽短梗霉生物合成普鲁兰多糖的影响,本文分别选用来源于木薯、玉米、马铃薯、红薯和小麦等作物的淀粉作为碳源发酵生产普鲁兰多糖。结果发现,木薯淀粉有利于普鲁兰多糖的生物合成,最高产量达到23.96 g/L;红薯淀粉则不利于普鲁兰多糖的合成,显著(P<0.05)降低了普鲁兰多糖的产量和分子量。进一步地,对普鲁兰多糖分批发酵动力学参数和生理学指标进行分析比较,发现木薯淀粉提高了普鲁兰多糖合成关键酶活性和胞内前体物质尿苷二磷酸葡萄糖的含量,进而提高了普鲁兰多糖的合成能力和产量;而红薯淀粉则提高了普鲁兰多糖降解酶活性,显著(P<0.05)降低了普鲁兰多糖的分子量。对普鲁兰多糖分批发酵碳源成本进行估算,发现利用木薯淀粉合成普鲁兰多糖的碳源成本只有葡萄糖对照组的56.6%。该研究结果为普鲁兰多糖的廉价高效生产提供了可行的技术参考。 相似文献
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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
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John Gilbert Catherine Simoneau David Cote Achim Boenke 《Food Additives & Contaminants》2000,17(10):889-893
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
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Sophie Guillot Laurence Peytavi Sylvie Bureau Renaud Boulanger Jean-Paul Lepoutre Jean Crouzet Sabine Schorr-Galindo 《Food chemistry》2006
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
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Jesus Simal-Gandara Miguel Sarria-Vidal Arjen Koorevaar Rinus Rijk 《Food Additives & Contaminants》2000,17(8):703-711
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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M. S. Garcí a-Falc n J. Simal-G ndara S. T. Carril-Gonz lez-Barros 《Food Additives & Contaminants》2000,17(12):957-964
A simple, rapid and inexpensive method has been developed for the determination of benzo[a 相似文献
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H. J. Van Den Top A. Boenke P. A. Burdaspal J. Bustos H. P. Van Egmond T. Legarda A. Mesego A. Mourino W. E. Paulsch C. Salgado 《Food Additives & Contaminants》2001,18(9):810-824
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
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《肉类研究》2014,(2)
<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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《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
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《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