1. aBio-Oils Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 N. University Street, Peoria, Illinois 61604, USA
2. bInstitute of Chemical Industry of Forestry Products, CAF, Nanjing, Jiangsu 210042, China
3. cIllinois Sustainable Technology Center, University of Illinois at Urbana-Champaign, 1 Hazelwood Drive, Champaign, Illinois 61820, USA