4.7 Article

Enhanced ethanol production from lignocellulosic hydrolysate using Meyerozyma caribbica biofilm immobilized on modified epoxy foam

期刊

BIOMASS & BIOENERGY
卷 154, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2021.106267

关键词

Biofuel production; Lignocellulosic biomass; Biofilm formation; Surface modification; Microbial adhesion

资金

  1. Interdisciplinary Graduate School ofEnergy System (IGS-ENERGY), Prince of Songkla University (PSU), Thailand [2-2018/04]
  2. Environmental Assessment and Technology for Hazardous Waste Management Research Center, Faculty of Environmental Management, PSU
  3. graduate school dissertation fund of PSU

向作者/读者索取更多资源

Plasma surface modification to improve yeast biofilm immobilization on bio-based epoxy foam resulted in enhanced ethanol production and shortened immobilization period. The modified foam promoted yeast cell attachment and enhanced adhesion force, preventing biofilm detachment and improving tolerance to inhibitors in the hydrolysate. Overall, this approach offers a more efficient and economical fermentation process.
In comparison to planktonic cells, microbial biofilm immobilization is known to enhance ethanol production. To maintain this capability during long-term fermentation, the detachment of the biofilm must be prevented. In this study, the enhancement of the biofilm immobilization of the yeast Meyerozyma caribbica YLP01GX on bio-based epoxy foam (EF) was performed through plasma surface modification to improve the production of ethanol from oil palm empty fruit bunch hydrolysate. This newly synthesized EF serves as a suitable carrier due to its superior properties and cost-effectiveness. The modification could induce yeast cell attachment more rapidly with more extracellular polymeric substance (EPS) being produced in the presence of the yeast extract. Therefore, the immobilization period can be shortened. In comparison to untreated EF-immobilized cells (NEF-IC), the modified EF-immobilized cells (MEF-IC) showed an improved binding affinity for proteins in the EPS, which resulted in a higher adhesion force between the carrier and the yeast cell surface. The stable biofilm attachment on the modified EF can prevent biofilm detachment and improve the tolerance of the yeast to inhibitors in the hydrolysate, leading to enhanced ethanol production compared to NEF-IC. Additionally, the MEF-IC was reused several times with similar fermentation activity being observed. This approach offers a more efficient and economical fermentation process.

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