インデックス付き
- 学術雑誌データベース
- Genamics JournalSeek
- アカデミックキー
- ジャーナル目次
- 中国国家知識基盤 (CNKI)
- シマゴ
- Global Online Research in Agriculture (AGORA) へのアクセス
- 電子ジャーナルライブラリ
- レフシーク
- 研究ジャーナル索引作成ディレクトリ (DRJI)
- ハムダード大学
- エブスコ アリゾナ州
- OCLC-WorldCat
- SWBオンラインカタログ
- 仮想生物学図書館 (vifabio)
- パブロン
- ミアル
- 大学補助金委員会
- ジュネーブ医学教育研究財団
- ユーロパブ
- Google スカラー
このページをシェアする
ジャーナルチラシ
概要
Behavior of Pulsed Electric Fields Injured Escherichia coli O157:H7 Cells in Apple Juice Amended with Pyruvate and Catalase
Dike Ukuku, Hyung-Gyun Yuk and HOWARD ZHANG
Pulse Electric Field (PEF) treatment has been used to inactivate bacteria in liquid foods. However, information on the behavior of PEF injured Escherichia coli bacteria in media during storage at 5 and 23°C are limited. In this study, we investigated the fate of E. coli O157:H7 cells at 6.8 log CFU/ml in apple juice treated with PEF at 7.2 kV/cm and 32.2 kV/cm, 18.4 A with pulse width of 2.6 s at 25, 35, 45 and 55°C, at a fl ow rate of 120 ml/min. The juices collected were amended with pyruvate and catalase (0 to 0.1%) and then stored at 5 and 23°C for 24 h. Periodically (0, 3, 6, and 24 h), 0.1 ml of the treated sample was plated on Sorbitol MacConkey Agar (SMAC) and Tryptic Soy Agar (TSA) amended with catalase and pyruvate to determine percent injury, viability loss and behavior of injured cells. PEF voltage at 32.2 kV/cm and treatments at 35, 45 and 55°C led to signi fi cant decline in the surviving cell populations than treatment at 7.2 kV/ cm. The injured populations in control media were higher than media amended with pyruvate and catalase suggesting possible recovery of PEF injured E. coli cells.