Antiphotoaging effect and purification of an antioxidant peptide from tilapia (Oreochromis niloticus) gelatin peptides

► TGP could alleviate the UV-induced abnormal changes of antioxidative indicators. ► TGP could protect the lipid of skin. ► TGP could increase the collagen content and decrease glycosaminoglycan content. ► TGP could protect histological changes of collagen. ► The key antioxidant peptide was purified from TGP.