Chitosan–ozone coating for effective control of Penicillium growth and enhanced preservation of Ruichang yam

Ruichang yams are highly susceptible to postharvest respiration and decay owing to their brittle nature and vulnerability to fungal infections. This study examines the effectiveness of a chitosan coating containing aqueous ozone solution (CCCAO) in preserving yams by examining Penicillium spores inactivation following a first-order kinetic model under varying CCCAO concentrations (0.25%–2%). Additionally, the time required for a five-log reduction in spores was determined. The 2% CCCAO concentration showed significantly greater Penicillium inactivation relative to that with 0.5% and 1% concentration, with a half-maximal inhibitory concentration (IC 50 ) value of 0.68%. Antibacterial tests conducted using the Oxford Cup method revealed that 1% and 2% CCCAO inhibited Penicillium growth by approximately 85% and 98%, respectively. CCCAO treatment efficiently prevented mold-induced rot, offering a promising and safe solution for yam storage and preservation. Thus, CCCAO is a rapid, effective, and safe agent that could be used for controlling Penicillium contamination for the extended storage of Ruichang yams. • An optimal concentration of Chitosan Coating with aqueous ozone for Penicillium inactivation was proposed. • A first-order kinetic model was used for the inhibited of Penicillium growth. • The IC 50 value of CCCAO for inhibiting Penicillium was determined.