Nasution, A., and I. Wahyuni. “Antioxidant Activity of Edible Film Made From Catfish (Pangasius Hypophthalmus) Gelatin Supplemented With Astaxanthin Using DPPH Method”. JPK : Jurnal Proteksi Kesehatan, Vol. 12, no. 2, Dec. 2023, pp. 208-13, doi:10.36929/jpk.v12i2.714.