1. University of Trás-os-Montes e Alto Douro; Department of Chemistry, Apartado 1013; 5000-811 Vila Real Portugal
2. University of Minho; Chemistry Centre and Chemistry Department, Campus de Gualtar; 4710-057 Braga Portugal
3. University of Potsdam; Institute of Chemistry; 14476 Potsdam Germany
4. National Research Centre, Cellulose and Paper Department; 33 Bohouth Street Dokki, Giza 12622 Egypt
5. Université de Montpellier; Institut Charles Gerhardt, CNRS UMR 5253 CNRS-UM-ENSCM; Place Eugène Bataillon 34095 Montpellier, Cedex 05 France
6. University of Trás-os-Montes e Alto Douro; Department of Chemistry; 5000-811 Vila Real Portugal