1. STFI-Packforsk ABPackaging and Logistics, Box 5604, SE-114 86 Stockholm, Sweden, Department of Crop Science, The Swedish University of Agricultural Sciences, SE-230 53 Alnarp, Sweden, Department of Biochemistry and Biophysics, The Arrhenius Laboratories for Natural Sciences, Stockholm University, SE-106 91 Stockholm, Sweden, and School of Chemical Science and Engineering, Fibre and Polymer Technology, Royal Institute of Technology, SE-100 44 Stockholm, Sweden