Development, publication, and dissemination of the XXVII (2022), XXVIII volume (2023) and XXIX (2024) of the journal Progress on Chemistry and Application of Chitin and its Derivatives (PCACD) is funded under contract RCN/SN/0122/2021/1 from the resources of the Ministry of Education and Science in the frame of the program 'The development of scientific journals.'