Effects of chitosan biguandine hydrochloride coating on storage quality of cherry tomato and its antimicrobial activities

The antimicrobial activities of Chitosan biguandine hydrochloride (CGH) against S. Aureus, E. Coli and Rhizoctonia solani Kuhn were studied, respectively. Cherry tomatoes mass-loss ratio, firmness, total soluble solid, VC content, film penetration ratio and soluble acid content was examined attentively after fresh-keeping process with CGH as coating film. The minimal inhibited concentrations (MIC) against S. Aureus and E.Coli were 0.31 and 0.62mg/mL, respectively. CGH at 2.00mg/mL had a total antifungal effect on Rhizoctonia solani Kuhn. CGH with concentration of 3% coated on the cherry tomatoes showed a better preservation effect after 12d storage under (28±2) ℃. The mass-loss, firmness, total soluble solid, VC content, film penetration ratio and soluble acid content were 7.5%, 21.121N/cm2, 7.2%, 21.70mg/100g FW (fresh weight) , 27.4% and 0.35%, respectively.