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. 2015 Jun 8;5:11116. doi: 10.1038/srep11116

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a) Radial distribution functions of all atoms in hemicellulose, LCC and lignin. The first four peaks, a; b; c and d, are related to covalent bonds of O−H, C−H, C−C and C−O, respectively. The fifth and sixth peaks, e and f, exist due to the non-bonded interactions in the systems. b) Radial distribution functions between hydrogen atoms of hydroxyl groups and the oxygen atoms in hemicellulose, LCC and lignin. The first peak at 1.85 Å is related to hydrogen bonds and the second peak at 3.25 Å is attributed to the oxygen-oxygen distance on two hydroxyl groups bonded by hydrogen bonds.