Chitosan is a common name for a large group of chitins deacetylated to different degrees. In the last 30 years chitosan has been through an unimagined development and has been successfully carried ...into effect in different areas of our living. Chitosan and its derivatives are already being used in water cleaning, in pharmacy, in medicine, agriculture, food provisions and on textile fibers. Over the last twenty years the increase in the number of microbial caused diseases and hospital infections has led to intensive research into new materials and procedures, which would assure permanent bioactive effects together with complete safety for the people. Chitosan has frequently been applied as a biopolymer for antimicrobial protection [1],2]. Cellulose treatment with chitosan is considered to be effective in the case of optimal number of reductive cellulose groups onto which chitosan can bind permanently. It has also been demonstrated that the carboxyl groups in the cellulose, in comparison with aldehyde groups, have different effects on chitosan binding. In any case the adsorption of chitosan onto cellulose fibers exceedingly influences their chemical and physical surface character, which is of large importance in fibers f medical and hygiene applications. The aim of this research was to study the influence of chitosan adsorption on the changes of hydrophilic/hydrophobic character of natural (cotton) and regenerated (viscose, modal and lyocell) cellulose fibers. Water contact angles of non ]treated and chitosan treated fibers were determined using tensiometry.. The amount of chitosan adsorbed onto/into fibers, was confirmed by Kjeldahl analysis. The results showed that in the case of regenerated cellulose fibers chitosan treatment caused an improvement of surface hydrophilicity however, in the case of natural cellulose fiber the hydrophilicity was decreased after chitosan treatment.
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