Novel pH-sensitive chitosan hydrogels: swelling behavior and states of water

By X. Qu, A. Wirsén, A. Albertsson. 2000

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External stimuli response on a novel chitosan hydrogel crosslinked with formaldehyde (2006, background): “A peak at 1656 cm–1 is due to carbonyl stretching vibration of remaining acetamide group in chitosan (Qu et al 2000).”
Chitosan based hydrogels and their applications for drug delivery in wound dressings: A review. (2018, background): “Some attempts have been made for regulating chitosan pH-sensitivity by adding different additives or grafting or mixing with other polymers and preparing Polyelectrolyte complexes with anionic polymers (Krishna Rao et al., 2006; Meng et al., 2010; Qu et al., 1999; Qu et al., 2000).”