PPOX and freckles: Plant extracts rich in polyphenolic compounds have been employed as safe natural PPO inhibitors, e.g., dechlorophyllized green tea extract [6], dechlorophyllized Chamuang leaf extract [7], dechlorophyllized guava leaf extract [8], etc. Those extracts could retard the formation of melanosis in Pacific white shrimp during the refrigerated/chilled storage.