防腐剂动力学和表面活性剂对格拉姆阴性细菌膜分割的影响
Rajalakshmi Chockalingam1, Rakesh Vaiwala1, Nivedita Patil2
1Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India.
Langmuir : the ACS journal of surfaces and colloids
|February 13, 2026
概括
这项研究使用分子动力学量化了防腐剂和表面活性剂膜分离动力学. 像氧乙醇这样的防腐剂比表面活性剂更快地分离,由于时间尺度不同,不会受到混合物的影响.
科学领域:
- 生物物理学的生物物理.
- 计算化学的计算化学
- 食品和化品科学 食品和化品科学
背景情况:
- 防腐剂对于食品,化品和药物安全至关重要,依赖于抗菌性质.
- 了解防腐剂-表面活性剂相互作用和膜分离动力学对于配方疗效至关重要.
- 目前的知识缺乏关于常见防腐剂如何与细胞膜相互作用的分子洞察力.
研究的目的:
- 评估和量化大肠杆菌*内部脂膜中的防腐剂和表面活性剂的膜分离动力学.
- 开发一种基于质量转移的模型,用于预测膜分裂动力学.
- 调查表面活性剂对防腐剂分离动力学和平衡的影响.
主要方法:
- 防腐剂和表面活性剂分离的粗粒度分子动力学模拟.
- 基于质量转移的动力模型的开发和应用.
- 使用第一阶段和零阶段模型分析分区动力学,包括类聚合力学.
主要成果:
- 氧乙醇 (POE) 和甲基帕拉本 (MEP) 呈现出较快的第一阶分割 (τ ~ 0.01 μs),而不是烯酸甘油 (CPG) 的零阶分割 (τ ~ 0.1 μs).
- 像SLES和CAPB这样的表面活性剂表现出较慢的零阶动力学 (τ ~ 1.5-10μs),由细胞释放控制.
- 在混合物中,保护剂分离动力学降低了2-10倍,但由于时间尺度的分离,平衡和保持不变.
结论:
- 开发的运动模型准确地描述了防腐剂和表面活性剂膜分离.
- 表面活性剂显著影响防腐剂的分离动力学,主要是通过状聚合物的动力学.
- 这些发现为优化复杂配方中防腐剂的有效性提供了分子基础.
相关概念视频
01:17Gram-negative Bacterial Protein Secretion Systems
1.0K
Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
1.0K
01:19Enzyme Kinetics
104.4K
Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
104.4K
00:23Kinetic Energy
43.7K
Kinetic energy is the ability of an object in motion to do work or enact change. It can take on many forms. For instance, water flowing down a waterfall has kinetic energy. In biological systems, particles of light travel and are absorbed by plants to create chemical energy. Animals consume the chemical energy and give off molecules that carry their scent through the air. They also generate kinetic energy when they run away from predators. Entire systems also possess kinetic energy, like the...
43.7K
03:07Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy
30.0K
The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
30.0K
01:14Extraction: Partition and Distribution Coefficients
5.0K
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
For extracting a solute from an aqueous phase into an...
5.0K
01:23Negative Regulator Molecules
38.6K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.6K