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. 2016 Aug 31;9:186. doi: 10.1186/s13068-016-0594-y

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© The Author(s) 2016

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. 4 — Structural classification of reducing agents into five groups. Group I, monophenols. Group II, ortho-, meta- or para-isomers of compounds bearing a benzenediol moiety. Group III, reducing agents with a 1,2,3-benzenetriol moiety. Group IV, sulfur-containing compounds. Group V, compounds with neither a phenolic ring nor a sulfur atom