Abstract: A coting preservation reagent including nano-SiOx which was covalent bonded with disinfection functional group was manufactured and tried on mango at room tempreture,and compared with the preservation reagent of chitosan and nano- SiOx.The results of the test showed that the physiology and biochemistry variables such as hardness,chlorophyll,saccharide, soluble solid content of the coated mango changed significantly more slowly than those of untreated group.The morbidity rate of the mango treated with covalent bounding nano-SiOx reduced 90.38% and the good-fruit rate was 92.31%.

Key words: nano-SiOx, antibacterial, chitosan, mango, freshness