The book presents comparative results of studies of micro- and nanoparticles of cellulose and their derivatives, as well as revealed ways to form silver nanoparticles in the structure of NaCMC and their stabilization, as well as the possibility of obtaining polymer forms of bactericidal preparations containing silver nanoparticles. The first section of the monograph presents the results of studies of the effect of cellulose particle size on its reactivity, structure and physicochemical properties. The second section of the monograph is devoted to the study of the possibility of forming silver nanoparticles in the structure of cellulose and its water-soluble derivative Na-carboxymethylcellulose. The monograph is designed for scientists, bachelors and masters interested in the problems of synthesis, structure and properties of micro- and nanocellulose, as well as cellulose derivatives containing silver nanoparticles with bactericidal properties.