Studies on the Structure and Properties of Ultrasound-Assisted Enzymatic Digestion of Collagen Peptides Derived from Chinemys reevesii Skin

This study examined the ultrasound pretreatment (UP) and simultaneous ultrasound (US) effects on the structural–functional features of collagen peptides in Chinemys reevesii skin collagen hydrolysates (CCHs) using a composite protease system (Trypsin: Alkaline pro- tease, 1:1). Structural characterization revealed that UP induced the unfolding of collagen molecules, evidenced by reduced disulfide bond content and the concomitant increase in surface hydrophobicity. Consequently, ultrasound...