1. College of Forestry, The North-Western University of Agricultural and Forest Sciences and Technology, Yangling 712100, China; The BioComposites Centre, University of Wales, Bangor LL57 2UW, United Kingdom; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China; and Department of Chemistry, University of Wales, Bangor LL57 2UW, United Kingdom