Teoh, Qi Yin
(2021)
Evaluation Of Direct Ozone
Depuration On Shelf-Life Of Fresh
Tropical Oysters (Crassostrea
Iredalei).
Project Report.
Universiti Sains Malaysia.
(Submitted)
Abstract
Direct ozone depuration is a potential post-harvest processing method used to treat
fresh tropical oysters to ensure the safety and preserve the quality of tropical oysters
especially those that are usually being eaten raw. The quality of the tropical oysters
undergoes treatment was significantly affected by different levels of ozone
concentration and depuration time. The present study successfully proved that higher
ozone concentration and longer depuration time significantly reduced the microbial
loads and slow down protein degradation while maintaining the freshness and
preventing the spoilage of tropical oysters. The bacteria species present in tropical
oysters reduced at a different rate due to the different initial microbial loads, variation
of chemical composition in tropical oysters, sensitivity or persistency of bacteria
species towards ozone and inherent differences in bacteria cells. Fecal coliforms and
Vibrio cholerae showed less sensitivity towards ozone treatment than other bacteria
species in this study. Despite this, higher ozone concentration and longer depuration
had a detrimental effects on the survival of tropical oysters whereby the shelf-life of
treated tropical oysters was shortened as compared to the fresh tropical oysters.
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