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黄孢原毛平革菌预处理对酒糟酶解效果的影响

DOI :10.13746/j.njkj.2018149

收稿日期:2018-05-24作者简介:裴芳霞(1988-),女,甘肃定西人,检验员,E -mail :1360771490@https://www.wendangku.net/doc/a818131212.html, 。

优先数字出版时间:2018-08-07;地址:https://www.wendangku.net/doc/a818131212.html,/kcms/detail/52.1051.TS.20180807.1614.002.html 。

黄孢原毛平革菌预处理对酒糟酶解效果的影响

裴芳霞

(黔南州粮油质量检测中心,贵州都匀558000)

摘要:为促进白酒糟生物质的酶解糖化,筛选出适宜的预处理条件,以脱除木质素,提高综纤维素

(纤维素、半纤维素之和)保留率为目标,研究了黄孢原毛平革菌(Phanerochaete chaysosporium )生长曲线

及预处理时间对酶解效果的影响。研究结果发现:在P .chaysosporium 接种量为3%,培养时间为8d 时,

酶解液中还原糖、木糖得率达到最大,分别为60.55%和21.33%;综纤维素的保留率和木质素的降解率

分别为76.85%和26.44%;电镜扫描(scanning electron microscope ,SEM )及X 衍射(X -ray differaction ,

XRD )结果显示,酒糟经P .chaysosporium 处理后酒糟结构发生明显变化,木质纤维网络结构遭到破坏,

表面呈现无规则或形状各异的膨松状,沟壑明显,孔隙率增加,比表面积增大,有利于提高水解酶的可

及性。

关键词:酒糟;黄孢原毛平革菌;预处理;酶解糖化

中图分类号:TS262.3;TS261.1;TS261.9文献标识码:A 文章编号:1001-9286(2018)09-0081-05

Effects of Phanerochaete chrysosporium Pretreatment

on Enzymatic Saccharification of Distillers Grains

PEI Fangxia

(Qiannan Grain and Oil Quality Testing Center,Duyun,Guizhou 558000,China)

Abstract :Distillers grains (DG),composed of unhydrolyzed and unfermented polymeric sugar,is the co-product in distilleries.In this study,the effects of Phanerochaete chaysosporium pretreatment on enzymatic saccharification of distillers grains were explored.The results suggested that,as the inoculating quantity of P .chaysosporium was 3%and the culture time was 8d,the yield of reducing sugar and xylose reached the maximum of 60.55%and 21.33%,and the holocellulose retention rate and lignin degradation rate were 76.85%and 26.44%respectively.Besides,SEM and XRD results revealed that there were significant changes in the structure of dis-tillers grains after P .chaysosporium pretreatment including destroyed wood fiber network structure,irregular puffing state in various shapes,and increasing porosity etc.,which were helpful for enzymatic saccharification of distillers grains.

Key words :distillers grains;Phanerochaete chaysosporium ;pretreatment;enzymatic saccharification

随着化石能源的日益枯竭,生物能源的开发不

仅有助于缓解日益严重的能源危机,还能减轻对地

球温室效应和雾霾天气影响。木质纤维生物质各

组分结构复杂,彼此关联。纤维素和半纤维素链内

和链间主要通过氢键连接,木质素内部除了有强大

的氢键连接外,还与半纤维素形成稳定的木质素-

碳水化合物复合体。三者相互交织的结构决定了

任何一类成分的降解必然受到其他成分的制约,如木质素对纤维素和半纤维素酶解过程的空间位阻作用,很难使水解酶直接作用于底物,导致酶解效率和糖得率较低[1]。因此,需要通过预处理技术破坏木质纤维素的致密结构,改变木质素与半纤维素周围的基质结构,提高酶与底物的接触面积,使其在酶作用下降解为可发酵糖,这也是燃料乙醇转化

酿酒科技2018年第9期(总第291期)·LIQUOR -MAKING SCIENCE &TECHNOLOGY 2018No .9(Tol .291)81万方数据

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