二氧化灭菌遵循日志线性微生物无活化动力学使用Geobacillus stearothermophilus生物指标
Thomas Richards1, Delaney Lisco2, Tiffany Bianchi2
1IM3 Inc., Washougal, WA; and trichards@im3consultinggroup.com.
PDA journal of pharmaceutical science and technology
|June 16, 2025
概括
这项研究确定了Geobacillus stearothermophilus子的二氧化 (NO2) 气体无活化动力学. 结果显示,NO2灭菌后的微生物无活化是日志线性的,这证实了它在实现10-6无菌保证水平方面的有效性.
科学领域:
- 微生物学 微生物学
- 消毒科学 消毒科学
- 化学动力学 化学动力学
背景情况:
- 生物指标 (BI) 对于验证杀菌过程至关重要.
- 二氧化 (NO2) 气体是一种新兴的杀菌剂,具有低温应用的潜力.
- 了解在NO2暴露下微生物子的无活化动力学对于工艺开发至关重要.
研究的目的:
- 为了确定暴露于二氧化 (NO2) 气体中的Geobacillus stearothermophilus子的无活化动力学.
- 为了评估湿度对NO2气体灭菌效率的影响.
- 确定NO2暴露与微生物失活之间的关系,以达到特定的无菌保证水平 (SAL).
主要方法:
- 在生物指标 (BI) 上的Geobacillus stearothermophilus子被暴露在80%相对湿度下的NO2气体中.
- 直接计数和分数负数方法被结合起来,在广泛的人口范围内量化幸存的子.
- 计算了D值和确定系数 (r^2) 以模拟失活动力学.
主要成果:
- 在 8 log10 种群范围内观察到 NO2 暴露和子无活化之间的日志线性关系.
- 高确定系数 (r^2 > 0.8) 证实了动力模型的可靠性.
- 不活性化动力学在不同的BI批量和子作物中是一致的.
结论:
- 二氧化灭菌遵循第一阶段的日志线性微生物无活化动力学.
- 作用机制与单一的活性物种一致,可能与NO2的化学特性有关.
- 这项研究提供了关于NO2灭菌的微生物无活化动态的第一份报告,支持其用于实现SAL 10^-6.
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