在室温高压储存期间,水汁对微生物行为的水活动影响,作为案例研究
Vasco Lima1,2, Carlos A Pinto1, Jorge A Saraiva1
1Associated Laboratory for Green Chemistry-Clean Technologies and Processes (LAQV-REQUIMTE), Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
Foods (Basel, Switzerland)
|February 27, 2026
概括
高压储存 (HS) 为保存西瓜汁提供了一个比冷藏更环保的替代方案. HS有效地控制微生物的生长,并使细菌失活,特别是在更高的压力和较低的水活动水平下.
科学领域:
- 食品科学与技术 食品科学与技术
- 微生物学 微生物学
- 食品工程 食品工程
背景情况:
- 高压储存 (HS) 是一种低能耗,低排放的食品保存方法,使用室温 (RT) 的温和压力.
- 西瓜汁 (WJ) 是一种营养丰富的饮料,由于其pH值和高水活性 (aW) 而易腐烂.
- 了解W在HS期间对微生物行为的影响,对于其在食品保存中的应用至关重要.
研究的目的:
- 研究水活动 (aW) 对西瓜汁 (WJ) 保存的影响,使用室温 (RT) 的高压储存 (HS).
- 评估微生物无活化和特定细菌 (大肠杆菌,李斯特菌单细胞菌) 和酵母菌 (Saccharomyces cerevisiae) 在WJ在不同的W和HS条件下的生长.
- 为了比较HS与传统制冷 (RF) 和大气压储存在RT的有效性.
主要方法:
- 用不同的aW水平 (0.9300.971) 用肠杆菌 (大肠杆菌,L. monocytogenes,S. cerevisiae) 接种肠杆菌的目标微生物.
- 在高压条件下 (2575 MPa) 在RT下在28天内储存注射WJ.
- 与在RT和RF条件下的大气压下存储的对照组进行比较.
主要成果:
- 高压储存 (HS) 有效控制了WJ中的微生物生长,并观察到储存期间的不活化.
- HS的疗效取决于W,微生物类型和施加的压力,在5075MPa和W0.9300.950.950.0时,失活性更大.
- 微生物生长主要观察到最高的aW (0.971),而无活化则偏好在较低的aW和更高的压力.
- 无活化动力学是使用第一阶和韦布尔模型建模的,韦布尔模型经常提供更好的匹配.
结论:
- 高压储存 (HS) 通过控制微生物生长和诱导无活化来证明保存西瓜汁 (WJ) 的巨大潜力.
- 对于WJ来说,HS提供了比冷却更有效的保存策略,特别是在水活动减少和压力增加的情况下.
- 这些发现支持HS作为一种更环保,更节能的食品保存替代品,不需要温度控制.
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