1. Department of Forest Biomaterials and Technology; Swedish University of Agricultural Sciences; SE 901 83 Umeå Sweden
2. Department of Food Science; Swedish University of Agricultural Sciences; SE 75007 Uppsala Sweden
3. National Energy R&D Centre for Non-food Biomass; China Agricultural University; Beijing 100193 China
4. Energy Technology and Thermal Process Chemistry; Umeå University; SE-901 87 Umeå Sweden