The Preparation Of Bio-liquid And Chitosan Complex Preservative And The Effect On Storage Quality Of Pepper

In order to improve the utilization rate of biomass and develop nonhazardous preservative of garden stuff,based on the bio-liquid as research material,study the acaricidal experiment of bio-liquid and chitosan against Colletotrichum nigrum and the preparation of complex preservative,also study the storage effect on pepper treated by complex preservative.Results showed that EC50 against Colletotrichum nigrum was 50 times bio-liquid and 0.7 g/L chitosan.The MIC was 32.5 times bio-liquid and the MFC was 29 times bio-liquid.The MIC was 1.25 g/L chitosan,and chitosan had no antiseptic effect to Colletotrichum nigrum.Study by the co-toxicity factor,it had synergism on the acaricial activities of mixtures containing of bio-liquid and chitosan against Colletotrichum nigrum,the 50 times bio-liquid and 0.7 g/L chitosan by the ratio of 1:1 had strong toxicity,so determined the complex agent was the best complex preservative.The pepper treated by bio-liquid and chitosan complex preservative showed extension of preservation time during the storage,the hardness,soluble solids,Vc and total acid of complex preservative group decreased less than chitosan control group and CK group,weight loss rise slowly than the other two groups;complex preservative treatment on a*value and b*value of pepper,increased less than CK group.Thus it can confirm complex preservative delay the ripening and senescence of pepper and had good preservation effect.