Abstract:
Sunscreens with natural ingredients for skin care become a new trend in cosmetology as it protects skin against photo-aging and dermatologic
disorders. Therefore, the goal of this study was to evaluate the antioxidant, antimicrobial and photoprotective properties of methanolic
extracts of leaves, peel and pulp of Psidium guajava L. to investigate their potentials to be used as sources of cosmeceutical ingredients
for sun protection. Chemical constituents of the plant parts were extracted into methanol by maceration. Among the extracts, leaf extract
exhibited higher DPPH free radical scavenging activity (IC 50 = 89.56 ± 0.97 μg/mL), than that of peel and pulp extracts. The highest total
phenolic content (TPC) and total flavonoid content (TFC) were found to be in the leaf extract. All extracts demonstrated antibacterial
activity against the examined potential pathogens in cosmetic products. Among the extracts, leaf extract showed the highest photoprotective
property with the sun protection factor (SPF) of 30.38 ± 0.22 at 2 mg/mL indicating its potential to be used in the development of
sunscreen formulations.
