Fig. 3

a–d UV absorbance spectrum of AuNPs synthesized by A. muricata peel at 10⁻¹ (ƛ_max − 529 nm), A. muricata pulp at 10⁻¹ (ƛ_max − 525 nm), A. muricata peel at 10⁻³ (ƛ_max − 520 nm), A. muricata pulp at 10⁻³ (ƛ_max − 543 nm). The peak confirms the formation of AuNPs