| dc.description.abstract | The purpose of this study was to investigate possibility of using natural extract from plant materials for control of melanosis in frozen shrimps instead of synthetic chemicals. Shrimp is a highly perishable product with limited shelf life due to development of melanosis during cold storage. Ethanolic extract from Mangosteen peel, grape seed, mango seed, avocado seed and pomegranate peel were obtained from extraction with ethanol by shaking in temperature-controlled water bath. The total phenolic content and 2, 2 – Diphenyl – 1 – picrylhydrazyl of all the fruit extracts were high, especially for mango seed extract, which was 419.9 mgGAE/g and 71.58%. The results were correlated with the results in the polyphenol oxidase inhibition capacity, in which mango seed extract also showed the high value in polyphenol oxidase inhibition capacity which was 77.61%. Additionally, the effect of the extracts at different concentrations (0, 7.5 and 15 g/L) was investigated against the melanosis formation and sensory quality of white leg shrimp (Litopenaeus vannamei) stored in ice for 10 days. The melanosis formation was significantly inhibited and the color was significantly improved in white leg shrimps treated with various concentrations of fruit extracts, compared with the blank and the control by sodium metabisulfite. This results correspond to the results of the PPO inhibition capacity. In conclusion, the study suggested that the mango seed extract at the concentration of 15g/L could be used as an effective natural alternative to the commercial Sodium metabisulfite anti-melanosis agents to inhibit postmortem melanosis in shrimp due to the high in total phenolic content, antioxidant capacity, polyphenol oxidase inhibition capacity and high in L* value. The optimum on ice storage time for white leg shrimp treated with mango seed extract should be below 8 days.
Keyword: Avocado seed, grape seed, mangosteen peel, mango seed, melanosis, pomegranate peel, white leg shrimp | en_US |
