1. Department of Biosystems Engineering & Soil Science, University of Tennessee‐Knoxville, 2506 E.J. Chapman Drive, Knoxville, Tennessee (USA), Fax: (+1) 865‐974‐4514
2. Center for Renewable Carbon, Biomass Chemistry Laboratories, University of Tennessee‐Knoxville, 2506 Jacob Drive, Knoxville, Tennessee (USA)