Eventually, we prepared -chitosan with different Mw ranging from above 4 × 106 to
1 × 103 g/mol.
/ The IR, XRD and NMR data confirmed that the - chitosan had the proper structure at different Mw.
/Therefore, the preparation and degradation motheds used for -chitosan in this paper were effective without altering the configuration of the chitosan.
/Increasing the solubility of -chitosan enabled studies of its antiviral activity against NDV. /The degraded -chitosan showed excellent antiviral activity and might be treated as a potential veterinary drug in future research.