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首页> 外文期刊>Journal of King Saud University >Pretreatment of microalgal biomass to improve the enzymatic hydrolysis of carbohydrates by ultrasonication: Yield vs energy consumption
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Pretreatment of microalgal biomass to improve the enzymatic hydrolysis of carbohydrates by ultrasonication: Yield vs energy consumption

机译：预处理微藻生物质以通过超声改善碳水化合物的酶促水解：产量与能量消耗

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Microalgal biomass has been considered as a possible alternative source of carbohydrates and lipids in fermentative/reactional processes, called third generation of biofuels. Carbohydrates from microalgae are mostly composed by glucose and some pentose-derived polymers that must be hydrolyzed to be efficiently used. When enzymatic hydrolysis is applied a pretreatment is required. Sonication/ultrasonication is one of the most promising methods, and in this paper the influence of pretreatment time, sonication intensity and biomass concentration was validated, and the energy consumed in the process compared as well. Sonication intensity had the major role on the enzymatic accessibility. Pretreatment time can be used to decrease hydrolysis time. More than 90% of hydrolysis efficiency was reached when higher amplitude (sonication intensity) and pretreatment time were used. The applied energy influenced indirectly the hydrolysis process. The best saccharification/energy relation was reached when 50% of amplitude for 25?min was applied, obtaining 91% of hydrolysis yield and spending 2.4?MJ/kg of dry biomass.
机译：微藻生物质已被认为是发酵/反应过程中碳水化合物和脂质的可能替代来源，被称为第三代生物燃料。来自微藻类的碳水化合物主要由葡萄糖和一些戊糖衍生的聚合物组成，必须水解才能有效使用。当进行酶水解时，需要预处理。超声/超声处理是最有前途的方法之一，本文验证了预处理时间，超声处理强度和生物质浓度的影响，并比较了过程中消耗的能量。超声强度对酶的可及性起主要作用。预处理时间可用于减少水解时间。当使用更高的振幅（超声强度）和预处理时间时，水解效率可达到90％以上。所施加的能量间接影响水解过程。当施加25％/ min的振幅的50％时，糖化/能量关系最佳，获得91％的水解产率，每千克干生物质消耗2.4？MJ。

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