THE EFFECT OF RED SEAWEED EXTRACT ON QUALITY OF WHITELEG SHRIMP (LITOPENAEUS VANNAMEI) DURING ICED STORAGE
Abstract
Tyrosinase plays an important role in the formation of melanin. Thus, the process of melanin
formation can be reduced through the inhibition of tyrosinase. The objective of this study is to
investigate the tyrosinase inhibitory activity of different red seaweeds harvested in the coast of
Khanh Hoa Province. All the tested extracts showed inhibitory effect on tyrosinase activity. The
Gelidiella acerosa extract showed the most tyrosinase inhibitory activity with the IC50 value of
3.04mg/mL. The effects of extraction conditions on tyrosinase inhibitory activity of G. acerosa were
investigated. Water was identified as the most effective solvent for the extraction. The suitable
extraction conditions were found to be the solid to liquid ratio (g/mL) of 1/40, the extraction time of
60 min and the extraction temperature of 60C. The melanosis formation was significantly inhibited
in whiteleg shrimp (Penaeus vannamei) treated with the G. Acerosa extract during storage in ice,
compared with the control. Therefore, the red seaweed G. Acerosa could be used as a potential
melanosis inhibitor in shrimp during refrigerated storage.
