等离子体生物传感应用中大肠杆菌对α-Al₂O₃吸附的建模研究

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-09-29 DOI:10.1016/j.colsurfa.2025.138507

Jabir Hakami , Abdelhak Dhibi , Chaker Briki , Nordin Felidj , Nadia Djaker

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引用次数: 0

摘要

利用统计物理吸附模型研究了大肠杆菌对α-Al₂O₃纳米颗粒的吸附行为。分析了20 ~ 35℃的实验等温线，得到受体位点密度（Nm）从20℃时的943.11244 mg/g下降到35℃时的593.76911 mg/g，每个位点的吸附分子数(n)从0.50058上升到1.08，吸附能（ΔE）在2.26 ~ 5.62 kJ·mol⁻¹ 之间，证实了物理吸附。统计模型在拟合数据方面优于Langmuir模型。同时，利用Mie理论评价了α-Al₂O₃、Au@α-Al₂O₃和α-Al₂O₃@Au@α-Al₂O₃纳米结构的理论LSPR性质，确定了α-Al₂O₃@Au@α-Al₂O₃结构对低浓度大肠杆菌检测的折射率灵敏度最高。该研究为大肠杆菌与基于spr的生物传感器的相互作用动力学提供了更深入的见解，并为开发高效的生物传感平台建立了新的框架。

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Modeling study of Escherichia coli adsorption on α-Al₂O₃ within plasmonic biosensing applications

This study investigated the adsorption behaviour of Escherichia coli on α-Al₂O₃ nanoparticles using statistical physics-based sorption models. Experimental isotherms from 20 to 35 °C were analyzed, yielding receptor site density (Nm) decreasing from 943.11244 mg/g at 20 °C to 593.76911 mg/g at 35 °C, and the number of adsorbed molecules per site (n) rising from 0.50058 to 1.08, with adsorption energy (ΔE) ranging from 2.26 to 5.62 kJ·mol⁻¹ , confirming physisorption. The statistical models outperformed the Langmuir model in fitting the data. Simultaneously, theoretical LSPR properties of α-Al₂O₃, Au@α-Al₂O₃, and α-Al₂O₃@Au@α-Al₂O₃ nanostructures were evaluated using Mie theory, identifying the α-Al₂O₃@Au@α-Al₂O₃ configuration with the highest refractive index sensitivity for low-concentration E. coli detection. This study provides deeper insights into the interactive dynamics of E. coli with SPR-based biosensors and establishes a novel framework for developing efficient biosensing platforms.

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.