The mechanistic pathways of extracellular polymeric substances in the inhibition of carbon steel corrosion.

IF 2.6 3区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biofouling Pub Date : 2025-04-07 DOI:10.1080/08927014.2025.2483739

Ping Xu, Xinyue Chen, Weijin Xi

引用次数: 0

Abstract

This study examined the corrosion inhibition mechanisms of extracellular polymeric substances (EPS) from Lactobacillus reuteri, Pseudomonas fluorescens, and Escherichia coli on carbon steel. Using UV spectrophotometry, LC-MS, infrared spectroscopy, and atomic force microscopy (AFM), it was apparent that all three EPS effectively inhibited corrosion, with optimal concentrations of 300 mg/L for Lactobacillus reuteri and 400 mg/L for the other species, yielding inhibition efficiencies of 28.25%, 23.87%, and 21.72%, respectively. The carboxyl group content was critical, with Lactobacillus reuteri EPS having the highest proportion. Functional group analysis showed it contained 12.39% and 12.93% more carboxyl groups than those from Pseudomonas fluorescens and Escherichia coli. Iron ion adsorption was primarily physical and occurred in a monolayer, with a greater capacity for Fe³⁺ than Fe²⁺, peaking at 600 mg/L.

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胞外聚合物抑制碳钢腐蚀的机理途径。

本研究探讨了罗伊氏乳杆菌、荧光假单胞菌和大肠杆菌胞外聚合物（EPS）对碳钢的腐蚀抑制机制。通过紫外分光光度法、LC-MS法、红外光谱法和原子力显微镜（AFM）分析，发现3种EPS均能有效抑制罗伊氏乳杆菌的腐蚀，其中对罗伊氏乳杆菌的最佳浓度为300 mg/L，对其他乳杆菌的最佳浓度为400 mg/L，其抑制效率分别为28.25%、23.87%和21.72%。羧基含量至关重要，其中罗伊氏乳杆菌EPS所占比例最高。官能团分析表明，其羧基含量比荧光假单胞菌和大肠杆菌分别高出12.39%和12.93%。铁离子吸附主要是物理吸附，发生在单层中，对Fe³+的吸附能力大于对Fe2+的吸附能力，在600 mg/L时达到峰值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biofouling 生物-海洋与淡水生物学

CiteScore

5.00

自引率

7.40%

发文量

审稿时长

1.7 months

期刊介绍： Biofouling is an international, peer-reviewed, multi-discliplinary journal which publishes original articles and mini-reviews and provides a forum for publication of pure and applied work on protein, microbial, fungal, plant and animal fouling and its control, as well as studies of all kinds on biofilms and bioadhesion. Papers may be based on studies relating to characterisation, attachment, growth and control on any natural (living) or man-made surface in the freshwater, marine or aerial environments, including fouling, biofilms and bioadhesion in the medical, dental, and industrial context. Specific areas of interest include antifouling technologies and coatings including transmission of invasive species, antimicrobial agents, biological interfaces, biomaterials, microbiologically influenced corrosion, membrane biofouling, food industry biofilms, biofilm based diseases and indwelling biomedical devices as substrata for fouling and biofilm growth, including papers based on clinically-relevant work using models that mimic the realistic environment in which they are intended to be used.