Fig. 3
From: Ozone detoxification of steam-pretreated Norway spruce
Comparison of detoxification methods: a glucose consumption, and b ethanol production after 24 h of fermentation. The markers indicate: untreated (closed diamond), alkali detoxification (cross symbol), sodium dithionite (closed square), ozone (0.75 g) (closed triangle), Fenton’s reagent (open circle), and reference fermentation (closed circle). Gray error bars show standard deviations