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用木质纤维原料生产乙醇的预处理工艺 总被引:24,自引:4,他引:24
预处理是利用木质生物资源生产乙醇的一个重要环节,纤维细胞的空隙度、纤维本身的结晶度、预处理温度、反应时间、pH值、纤维质原料的浓度对预处理产生影响,目前的预处理技术对木质生物资源的3种主要组分分离不完全且纤维素降解程度较高。今后对预处理的研究方向:有效分离出活性纤维,同时使半纤维素免遭破坏并充分利用,尽量减少对纤维素酶起抑制作用的降解产物的形成,减少能量消耗,降低成本,生产出高附加值的木素产品。 相似文献
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木聚糖酶在食品、饲料、造纸等领域具有重要的应用价值,而生产成本是决定微生物木聚糖酶能否实现工业应用的关键因素之一.木质纤维原料富含木聚糖,许多能够利用廉价的木质纤维原料诱导产生木聚糖酶的微生物得到了分离,有效地降低了酶制剂的生产成本.综述了微生物利用木质纤维原料产木聚糖酶的研究现状,重点关注了微生物木聚糖酶的产生、特性... 相似文献
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基于生物酶的专一性、高效性和环境友好性,生物技术在制浆造纸工业中已获得了广泛应用,并取得了良好的经济和环保效益。采用生物酶预处理木质纤维原料不仅可以改善纤维形态、提高纸浆性能、降低磨浆能耗、提高生产效率,而且能够缓解传统制浆造纸工业面临的环境污染问题,为造纸行业的绿色转型发展提供更多可能。但目前生物酶技术在木质纤维原料预处理工段的应用还存在一些不足,如生物酶在各种环境下如何保持活性、生物酶成本高、处理条件苛刻及反应时间长等均是实际生产中需要解决的问题。本文综述了果胶酶、木聚糖酶、纤维素酶及木质素降解酶等生物酶预处理木质纤维原料的理论与技术研究进展,以期为解决上述问题并使生物酶预处理技术在制浆造纸工业化生产中达到高效利用提供一定参考与思路。 相似文献
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Yeast derived from lignocellulosic biomass as a sustainable feed resource for use in aquaculture 下载免费PDF全文
The global expansion in aquaculture production implies an emerging need of suitable and sustainable protein sources. Currently, the fish feed industry is dependent on high‐quality protein sources of marine and plant origin. Yeast derived from processing of low‐value and non‐food lignocellulosic biomass is a potential sustainable source of protein in fish diets. Following enzymatic hydrolysis, the hexose and pentose sugars of lignocellulosic substrates and supplementary nutrients can be converted into protein‐rich yeast biomass by fermentation. Studies have shown that yeasts such as Saccharomyces cerevisiae, Candida utilis and Kluyveromyces marxianus have favourable amino acid composition and excellent properties as protein sources in diets for fish, including carnivorous species such as Atlantic salmon and rainbow trout. Suitable downstream processing of the biomass to disrupt cell walls is required to secure high nutrient digestibility. A number of studies have shown various immunological and health benefits from feeding fish low levels of yeast and yeast‐derived cell wall fractions. This review summarises current literature on the potential of yeast from lignocellulosic biomass as an alternative protein source for the aquaculture industry. It is concluded that further research and development within yeast production can be important to secure the future sustainability and economic viability of intensive aquaculture. © 2016 Society of Chemical Industry 相似文献
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YNL134C from Saccharomyces cerevisiae encodes a novel protein with aldehyde reductase activity for detoxification of furfural derived from lignocellulosic biomass 下载免费PDF全文
Xianxian Zhao Juan Tang Xu Wang Ruoheng Yang Xiaoping Zhang Yunfu Gu Xi Li Menggen Ma 《Yeast (Chichester, England)》2015,32(5):409-422
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Bruna da Silva Menezes Daniele Misturini Rossi Fabio Squina Marco Antônio Záchia Ayub 《International Journal of Food Science & Technology》2018,53(9):2110-2118
We investigated the simultaneous production of xylanase and the liberation of xylooligosaccharides in rice husk solid‐state cultivations of Aspergillus brasiliensis BLf1 and by the recombinant Aspergillus nidulans XynC A773 strain. The bioprocess was optimised by experimental fractional design and response surface analysis. Results show that both fungi strains produced xylanases and their activities were dependent on the addition of basal medium, moisture content and the interactions between particle size and inoculum size, producing maximum xylanase activities of 230.7 U g?1 substrate for A. brasiliensis, and 187.9 U g?1 substrate for A. nidulans XynC. Xylooligosaccharides were liberated in the same cultures, with concentrations up to 17.6 mg g?1 and 23.9 mg g?1 of substrate for A. brasiliensis and A. nidulans XynC, respectively, both strains presenting similar profiles, with xylose residues varying from X3 to X6. These results suggest the possibility of lowering production costs of enzymes for food applications and oligosaccharides. 相似文献
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天然木质纤维素纤维包括棉、亚麻、黄麻、苎麻、大麻、剑麻等,主要讨论天然木质纤维素纤维的阻燃性和阻燃方法,并简单分析了阻燃方法未来的发展趋势,包括应用纳米阻燃剂以及取代天然木质纤维素纤维的功能化反应基团等方法。利用基因工程获得转基因木质纤维素纤维,也是十分具有发展前景的阻燃整理方法。 相似文献
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Graham L. Pettipher 《Journal of the science of food and agriculture》1987,41(3):259-265
The establishment of a small-scale production facility for Pleurotus ostreatus is described and environmental and yield data are presented. The average yield was c. 50% fresh weight mushroom/dry weight substrate when grown on 40% cocoa shell waste, 40% softwood sawdust, 19% oatmeal and 1% carboxymethyl cellulose. The mushroom fruited when daily temperatures ranged between 11 and 27°C. 相似文献
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微波加热下甘蔗渣的液化行为研究 总被引:1,自引:0,他引:1
利用微波加热,使甘蔗渣在多羟基醇中快速液化,得到植物纤维基多元醇。主要研究了微波辐照时间和不同反应温度对液化效果的影响,并且比较了微波加热液化甘蔗渣与传统油浴加热液化的区别。结果表明,在160℃下微波辐照25min,液化的转化率达99%以上,而油浴液化要达到相同转化率,保温时间长达120min。微波加热所得的液化产物的羟值为293 mg KOH/g,质均相对分子质量为3490。 相似文献
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概述了生物可降解复合材料的加工方法、基质—增塑剂系统、形态结构、性能、产品开发及市场应用等方面研究进展,同时对一些关键性的问题和今后工作的建议进行了讨论。 相似文献