Ethanol, methane, or both? Enzyme dose impact on ethanol and methane production from untreated energy crop switchgrass varieties

A. Başar, Elcin Kökdemir Ünşar*, H. Ünyay, N. A. Perendeci

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


The production of bioethanol and subsequent methane from two raw switchgrass varieties with the addition of cellulase and β-glucosidase dose combinations was investigated in this study. Maximum ethanol production increment for the investigated varieties, Shawneé and Kanlow, were determined as 211.9% and 166.7%, respectively, compared to the control assays without enzymes. Considering higher ethanol production a priority, 42.0 mg EtOH/gVS and 223.5 mLCH4/gVS were produced from Shawneé variety at 50 EGU cellulase – 80 IU β-glucosidase doses. 20.2 mgEtOH/gVS, and 400.7 mLCH4/gVS were produced from Kanlow variety at 75 EGU cellulase – 80 IU β-Glucosidase doses. Furthermore, the highest total biofuel energy productions were found as 10750,9 MJ/tonne field dried switchgrass at 75 EGU cellulase – 20 IU β-glucosidase doses for Shawneé and 13556,9 MJ/tonne field dried switchgrass at 75 EGU cellulase – 80 IU β-glucosidase doses for Kanlow. Shawneé variety was found to be more suitable for cellulosic ethanol production.

Original languageEnglish
JournalRenewable Energy
Pages (from-to)287-297
Publication statusPublished - 2020


  • Biofuel production
  • Enzyme dose
  • Ethanol and Methane

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