“…In this con nection, it is necessary to perform a search for new, genetically engineered enzymes (carbohydrases) and their construction, which will make it possible to obtain the planned oligomers through the selection of a substrate (chitin or chitosan) with a specified DA and controlled DP. It is possible to use an alternative approach advanced by Russian researchers, which consists in the biosynthesis of chitooligomers, namely N acetylchitohexose and N acetylchitopentose in E. coli cells, by N acetylglucosaminyl transferase enzyme [39].…”