in aqueous solutions was triggered by the sonication of copolymer’s water solution by usinga probe type sonicator (VCX750, Sonics and materials Inc., USA)in an ice bath. In detail, 10 mg CS-g-PLA copolymer was dissolvedin 10 mL ultrapure water. Subsequently, the copolymer’s aqueoussolution was ultrasonicated at amplitude of 40 (750 W, 20 kHz) for30 min before analysis. The pulse function was pulse on 2 s andpulse off 2 s.