Microbubble-enhanced dielectric barrier discharge pretreatment of microcrystalline cellulose.
Microbubble-enhanced dielectric barrier discharge pretreatment of microcrystalline cellulose.
复制标题
微晶纤维素的微泡增强介电阻挡放电预处理。
DOI：
10.1016/j.biombioe.2018.08.005
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发表时间：
2018
影响因子：
6
通讯作者：
Wright A
中科院分区：
文献类型：
--
作者：
Wright A
纤维素的顽固性是将可再生生物质转化为生物燃料或有用化学品的主要障碍之一。研制了一种预处理反应器，在微泡气液界面处形成介质阻挡放电等离子体，对α-纤维素进行了预处理试验。等离子体放电的调制提供了对所产生的物质混合物的控制，并且发现活性氧（主要是臭氧）在破坏纤维素结构方面比活性氮更有效。通过测定处理后样品在氢氧化钠中的溶解度和纤维素酶解转化为葡萄糖的情况来确定不同条件下的预处理效果。在pH为3的缓冲液下进行预处理，效果最好，溶解度由17%提高到70%，葡萄糖转化率由24%提高到51%。在最佳条件下，等离子体微泡处理在纤维素表面产生明显的裂缝，增加了活性物质进一步分解结构和酶糖化的机会。
Cellulose recalcitrance is one of the major barriers in converting renewable biomass to biofuels or useful chemicals. A pretreatment reactor that forms a dielectric barrier discharge plasma at the gas-liquid interface of the microbubbles has been developed and tested to pretreat α-cellulose. Modulation of the plasma discharge provided control over the mixture of species generated, and the reactive oxygen species (mainly ozone) were found to be more effective in breaking-up the cellulose structure compared to that of the reactive nitrogen species. The effectiveness of pretreatment under different conditions was determined by measuring both the solubility of treated samples in sodium hydroxide and conversion of cellulose to glucose via enzymatic hydrolysis. Solutions pretreated under pH 3 buffer solutions achieved the best result raising the solubility from 17% to 70% and improving the glucose conversion from 24% to 51%. Under the best conditions, plasma-microbubble treatment caused pronounced crevices on the cellulose surface enhancing access to the reactive species for further breakdown of the structure and to enzymes for saccharification.