Journal
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
Volume 71, Issue -, Pages 58-69Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jmgm.2016.11.005
Keywords
Ammoniated lignin; Ammoxidized lignin; Molecular dynamics simulations; Molecular docking; Urea
Categories
Funding
- Natural Science Foundation of China [30871988]
- Jiangsu Provincial Science and Technology Project [BK2014147110]
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Ammoniated lignin, prepared through the Mannich reaction of lignin, has more advantages as a slow release carrier of urea molecules than ammoxidized lignin and lignin. The advantages of the ammoniated lignin include its amine groups added and its high molecular mass kept as similar as that of lignin. Three organic molecules including guaiacyl, 2-hydroxybenzylamine and 5-carbamoylpentanoic acid are monomers respectively in lignin, ammoniated lignin and ammoxidized lignin. We studied the difference between the interactions of lignin, ammoniated lignin and ammoxidized lignin with respect to urea, based on radial distribution functions (RDFs) results from molecular dynamics (MD) simulations. Glass transition temperature (T-g) and solubility parameter (delta) of ammoniated and ammoxidized lignin have been calculated by MD simulations in the constant-temperature and constant-pressure ensemble (NPT). Molecular docking results showed the interaction sites of the urea onto the ammoniated and ammoxidized lignin and three different interaction modes were identified. Root mean square deviation (RMSD) values could indicate the mobilities of the urea molecule affected by the three different interaction modes. A series of MD simulations in the constant-temperature and constant-volume ensemble (NVT) helped us to calculate the diffusivity of urea which was affected by the content of urea in ammoniated and ammoxidized lignin. (C) 2016 Elsevier Inc. All rights reserved.
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