| Summary: | 碩士 === 國立臺灣海洋大學 === 食品科學系 === 102 === Areola babylon (Babylonia areolata) is an edible snail with high commercial value. Usually live snail coupled with scattering ice is applied for its commercial sale or distribution. This study was to investigate the mortality and chemical compositions of areola babylon stored at different temperatures. Changes in chemical compositions of areola babylon with and without vacuum package during storage were also studied to reveal the storage stability for logistics and market promotion. Live areola babylon was stored at 10℃, 15℃ and 20℃, respectively. The mortality of areola babylon stored at 10℃ was lower than others. The moisture of three group samples decreased at different temperatures. The amounts of volatile basic nitrogen (VBN) and trimethylamine nitrogen (TMA-N) of groups at 20℃ were higher than those at 15℃ and 10℃. The major free amino acids (FAAs) of areola babylon were taurine, glutamic acid, alanine and arginine. The amount of urea in viscera was significantly higher than gastropod. The group at 10℃showed a lower mortality and spoilage level; therefore, 10℃ was a suitable temperature for the storage of areola babylon. The mortality of areola babylon without vacuum package was lower than that of vacuum package. The pH value of gastropod and viscera decreased at the early storage period and then increased after elongated storage. The total plate count (TPC), VBN, TMA-N increased with storage time, but glycogen decreased. The TPC exceeded the limit value of 3#westeur024#106 at 11-day and 8-day storage of areola babylon with and without vacuum package. The VBN content of viscera was higher than gastropod, and exceeded the limit value (25 mg/100g) at 11-day and 5- day storage groups with and without vacuum package. The increase rate of TMA-N of vacuum package group was lower than that without vacuum package. The glycogen content of viscera was significantly higher than gastropod, and decreased with time. AMP was the main accumulated nucleotide-related compound of areola babylon, and gradually broke down into inosine and hypoxanthine with storage time. There was a positive correlation between K’ value and storage time. The AEC value was the highest at the initial samples. However, the total FAAs decreased with time. The urea content increased at the early period of storage, and then decreased after elongated storage, but ammonia increased with time. In conclusion, the shelf-life of areola babylon with and without vacuum package was 8 and 5 days during storage at 10℃, respectively.
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