原牛奶中的细菌菌群的演变及其对冷储存期间质量特征的影响
Sijia Yang1, Wenjia Zhou1, Shihui Cheng1
1Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, China.
Food chemistry
|September 25, 2024
概括
经过四个月的冷牛奶质量下降,原因是细菌多样性增加和Pseudomonas和Acinetobacter等心理友好细菌的扩散,影响了安全性和物理化学性质.
科学领域:
- 食品科学 食品科学 食品科学
- 微生物学 微生物学
- 乳制品技术 乳制品技术
背景情况:
- 雅克牛奶是西藏地区的重要资源,通常通过传统的冷保存.
- 冷雅克牛奶的微生物污染和质量变化尚未得到充分了解.
研究的目的:
- 研究6个月在-18°C冷储存期间原始雅克牛奶的微生物污染和质量变化.
- 为了确定占主导地位的细菌物种及其与牛奶质量下降的相关性.
主要方法:
- 在牛奶样本中分析细菌种群和物理化学指标,这些样本被冷保存长达六个月.
- 评估细菌多样性,主导性精神性细菌和代谢途径表达.
- 特定细菌属和质量恶化标志物之间的相关性分析.
主要成果:
- 在冷储存的前两个月,雅克牛奶的质量保持稳定.
- 四个月后,细菌多样性的显著增加,特别是 Pseudomonas 和 Acinetobacter.
- 质量恶化的物理化学指标 (酸性,蛋白质溶解,脂肪氧化) 在四个月后显著增加.
- 与四个月标志相比,延长到六个月的储存没有显示细菌多样性或质量的进一步显著下降.
- 青菌和心理菌与牛奶质量恶化有很强的相关性.
结论:
- 经过四个月的储存后,由于微生物的繁殖,冷牛奶的质量显著下降.
- 主要的心理友好型细菌,包括Acinetobacter和Pseudomonas,导致质量下降.
- 这些发现强调了传统冷雅克牛奶的保质期有限以及潜在的安全问题.
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