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. 2017 Apr 8;10:86. doi: 10.1186/s13068-017-0777-1

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Response surface plot (3D and 2D) for the interactive effect of variables. a Effect of acetic acid concentration and pretreatment time, fixed H₂SO₄ addition at 0.64 (%, w/v); b effect of H₂SO₄ addition and pretreatment time, fixed acetic acid concentration at 52.6 (%, v/v); c effect of H₂SO₄ addition and acetic acid concentration, fixed pretreatment time at 1.7 h