4‑Hydroxyacetophenone is an Antipigmentation Reagent via Inhibiting Tryrosinase Activity.

Area of Science:

• Cosmetic Science
• Dermatology
• Biochemistry

Background:

• 4-Hydroxyacetophenone (4-HAP) is a common cosmetic preservative.
• Its skin-whitening potential is largely unreported.
• Preliminary observations suggested 4-HAP in commercial products may contribute to whitening effects.

Purpose of the Study:

• To investigate the skin-whitening potential of 4-Hydroxyacetophenone (4-HAP).
• To evaluate 4-HAP's efficacy as a tyrosinase inhibitor and melanin reducer.
• To confirm 4-HAP's stability and effectiveness in cosmetic formulations for skin lightening.

Main Methods:

• Utilized a mushroom tyrosinase model, B16 mouse melanoma cells, and zebrafish.
• Performed molecular docking and dynamics analyses to understand binding mechanisms.
• Tested 2% 4-HAP formulations on human skin models exposed to UV radiation.

Main Results:

• 4-Hydroxyacetophenone (4-HAP) demonstrated potent tyrosinase inhibition.
• Significant reduction in melanin content was observed both in vitro and in vivo.
• Human skin models treated with 4-HAP showed near-complete recovery from UV-induced pigmentation within 4 weeks.

Conclusions:

• 4-Hydroxyacetophenone (4-HAP) is an effective and stable skin-whitening agent.
• Its mechanism involves stable binding to tyrosinase, inhibiting melanin production.
• 4-HAP presents a promising ingredient for developing advanced skin lightening cosmetic products.