Other factors such as physical state, environmental conditionsand acting microorganisms have also a great influence on thebiocidic properties of chitosan and its derivatives A detailed reviewof current research in the field of antimicrobial activity of chi-tosan demonstrates theimportance of intrinsic factors of chitosan and its derivatives, suchas a positive charge density, molecular weight, chelating capac-ity and hydrophobic characteristic. The positive charge in chitosanmolecule, in turn, is determined by its deacetylation degree, pH andsubstances making up derivatives.Recently it has been demonstrated