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. 2019 Aug 2;7:545. doi: 10.3389/fchem.2019.00545

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Copyright © 2019 Sipponen and Österberg.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Enzymatic hydrolysability (24 h reaction time) of pre-treated straw solid fractions. (A) Response surface plot showing effects of ammonia concentration and treatment temperature on enzymatic hydrolysability (15 FPU/g). (B) Hydrolysabilities at 15 FPU/g (filled circles) and 2 FPU/g (open circles) activity dosages as a function of pre-treatment severity Log M₀; (C) Hydrolysability (15 FPU/g) as a function of lignin content of pre-treated straw prior to enzymatic hydrolysis. Data points show mean values ± one standard deviation.