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(a) L*, (b) a*, (c) b*, and (d) ΔE values of the sodium alginate (SA)/silver nanoparticles (AgNPs)/ apple polyphenol (APP) composite film with different ultrasonic time, respectively; (e) the picture of the SA/AgNPs/APP composite films with different proportions. (* p < 0.05, n = 5.)
