高压和巴氏杀菌对奶油的影响
Fernanda Machado1, Ricardo V Duarte1, Carlos A Pinto1
1Associated Laboratory for Green Chemistry of the Network of Chemistry and Technology (LAQV-REQUIMTE), Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
Foods (Basel, Switzerland)
|October 14, 2023
概括
高压加工 (HPP) 与热巴氏杀菌相比,可以将奶油的保质期延长超过15天,保持微生物安全性和物理化学稳定性. 惠普保证更安全,新鲜的乳制品没有热损伤.
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:
- 奶油的高水活性和pH值促进了微生物的快速生长,需要有效的保存方法.
- 传统的热巴氏杀菌可能会导致乳制品的不良变化.
- 高压加工 (HPP) 是消毒食品的非热替代方案.
研究的目的:
- 评估HPP和热巴氏杀菌对奶油微生物和物理化学性质的影响.
- 为了在冷藏储存期间比较HPP处理的保质期和质量,与热巴氏化奶油进行比较.
主要方法:
- 奶油使用HPP (450-600MPa在7°C下5-15分钟) 和热巴氏消毒 (75°C在15秒内) 来处理.
- 微生物学计数 (大肠杆菌,L. innocua),pH值,颜色,脂肪酸概况,粘度和挥发性有机化合物 (VOC) 在加工后立即和冷藏期间 (4°C) 进行了分析.
主要成果:
- 用HPP处理的奶油在微生物学上保持了至少51天的可接受性,比热巴氏化奶油要长得多.
- HPP减少了接种过的E. coli和L. innocua的数量超过6个日志单位.
- 像pH,颜色和脂肪酸这样的物理化学属性是稳定的;然而,HPP增加了粘度.
- 挥发性有机物,特别是酸和碳化合物,在储存期间在所有处理的样本中增加.
结论:
- 高压加工 (HPP) 与热巴氏杀菌相比,可以显著延长奶油的保质期至少15天.
- 惠普提供一种非热方法,以生产安全的,与新鲜奶油相似的奶油,而热引起的变化最小.
- 高电是一种可行的技术,可以提高易腐烂乳制品的安全性和延长保质期.
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