1. Institute of Chemistry; University of Silesia; 9 Szkolna Str. 40-006 Katowice Poland
2. Synthos SA; 1 Chemikow Str. 32-600 Oswiecim Poland
3. Institute of Natural Fibres and Medicinal Plants; Wojska Polskiego 71B Str. 60-630 Poznan Poland
4. 34 M Curie-Sklodowska Str. 41-819 Zabrze Poland