anita khairunnisa, Noviyanti, Y. Asterina, and A. Khairunnisa, “Antioxidant Activity Test Of Red Spinach Leaf (Amaranthus Tricolor L.) Extract And Fraction With Methode (2,2-Diphenyl-1 Picrylhydrazyl)”, sjt, vol. 9, no. 2, pp. 162–170, Aug. 2025.