Using carboxymethyl cellulose and pectin to construct an enzyme-responsive magnolol-release film against plant pathogenic fungi

This study aimed to realize controlled release of pesticides . Inspired by the characteristics of plant pathogenic fungi that release cell wall-degrading enzymes (CWDEs) to destroy plant cell walls, enzyme-responsive carboxymethyl cellulose , pectin, sodium alginate , and glycerol (CPSG) films were constructed to encapsulate carboxymethyl chitosan (CMCS) particles loaded with magnolol (Mag) to form a [email protected] @CPSG film. The results showed that the amount of Mag released by the [email protected] @CPSG film under cellulase and pectinase stimulation was 43.18% at 7 h, which was 103.87% higher than that in water. After the [email protected] @CPSG film treatment, the diameter of the disease spots on tobacco caused by Rhizoctonia solani decreased by 93.17%. The contact angle of the film on the rice leaf surface was less than 30° and the half-life of magnolol increased to 15.2 d. In conclusion, the CPSG film can realize the controlled release of pesticides and improve their utilization rate.