ArticleBioprocess and biosystems engineering2022
Effect of cellulose crystallinity modification by starch gel treatment for improvement in ethanol fermentation rate by non-GM yeast cell factories.
Article in Bioprocess and biosystems engineering, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This paper studies the reduction of crystallinity degree (CD) of cellulose treated with starch gel (SG), and the correlation of CD with the fermentation efficiency of cellulose to fuel-grade ethanol. Cellulose bioconversion from wood sawdust, consisting of three processes, was conducted in the same batch (one-step). The XRD and TEM analysis revealed 11% reduction in cellulose CD after its treatment with SG. One-step bioconversion process was performed employing two cell factories (CF) of non-engineered S. cerevisiae. CFs contained non- engineered S. cerevisiae cells covered with either SG entrapping Trichoderma reesei or cellulases prepared in the laboratory and immobilized in SG. The consolidated fermentation of treated cellulose resulted in an increase of bioethanol concentration (60-90%) in 2-day fermentation and the maximum ethanol concentration reached was approximately 5 mL/L (3.95 g/L). The fermentation efficiency for grade-fuel ethanol production was improved by cellulose pretreatment using SG to achieve reduced CD.
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