Abstract
There is scarce information on cationic surfactants’ biocidal and corrosion inhbibition effects on Slime-Forming Bacteria (SFB) isolated from oil field formation water. Therefore, this work focused on the the synthesis of a cationic surfactant (CS) to increase its features by capping different metal nanoparticles (zinc, ZnNPs-C-CS; manganese, MnNPs-C-CS and tin, SnNPs-C-CS) and used them as biocides and corrosion inhibitors. The cationic surfactant was synthesized and characterized by Fourier-Transform Infrared (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopy. Afterwards, different nanoparticles were synthesized, characterized, and exploited to cap by the CS. The CS and the different nanoparticles capped by the CS were tested for their antimicrobial susceptibility against standard bacterial and yeast strains. The synthesized compounds were further evaluated as anti-biofilms agents against positively-developed bacterial biofilms. Moreover, the CS and the ZnNPs-C-CS, MnNPs-C-CS, and SnNPs-C-CS were assessed as potential biocides against SFB, particularly Pseudomonas sp. (isolated from contaminated formation water), and as corrosion inhibitors against cultivated salinity. The results revealed the great effect of the different CS-capped NPs as broad-spectrum antimicrobial and anti-biofilm agents at lower Minimum Inhibitory Concentrations (MICs), Minimum Bactericidal Concentrations (MBCs), Minimum Fungicidal Concentrations (MFCs) and Minimum Biofilm Inhibitory Concentrations (MBICs), and the activities were reported in order of SnNPs-C-CS > MnNPs-C-CS > ZnNPs-C-CS > CS. Furthermore, the ZnNPs-C-CS, MnNPs-C-CS, and SnNPs-C-CS demonstrated biocidal and corrosion inhibition effects against Pseudomonas sp. at a salinity of 3.5% NaCl, with metal corrosion inhibition efficiencies of 88.6, 94.0 and 96.9%, in comparison to a CS efficiency of 85.7%. In conclusion, the present work provides a newly synthesized cationic surfactant and has enhanced its antimicrobial and its metal corrosion inhibition effects by capping different nanoparticles, and it has been successfully applied against slime-forming bacteria at a salinity of 3.5% NaCl.
Highlights
Influenced corrosion or bio-corrosion can be attributed to metal destruction initiated or accelerated by the microbial activities on metal surfaces, in the form of localized pit and crevice corrosion [1]
Microorganisms, especially bacteria, accelerate corrosion reactions via their attachment to the metallic materials in the form of biofilms, aggressive metabolites produced such as sulfides, acid or oxidant substances or via increasing cathodic reactions [4,5]
Different nanoparticles of zinc, manganese and tin capped by the cationic surfactant (CS) (ZnNPs-C-CS, MnNPs-C-CS, and SnNPs-C-CS) in order to evaluate their potentiality as broad antimicrobial agents, anti-biofilm agents and as biocides and corrosion inhibitors for environmentally isolated and enriched Pseudomonas sp. under high salinity conditions
Summary
Influenced corrosion or bio-corrosion can be attributed to metal destruction initiated or accelerated by the microbial activities on metal surfaces, in the form of localized pit and crevice corrosion [1]. Bacterial biofilm formation can cause extremely dangerous problems [6,7] and has a role in the material biofouling, which induces bad impacts in industrial fields as biofilms can not be eradicated with normal biocides or antibiotics [8,9] Such a bacterial community induces severe pitting or crevice corrosion by the formation of differential aeration cells on the metallic materials. There are still limited structural changes in pyrrolidinium-synthesized surfactants using pyrrolidine as a raw material. Different nanoparticles of zinc, manganese and tin capped by the CS (ZnNPs-C-CS, MnNPs-C-CS, and SnNPs-C-CS) in order to evaluate their potentiality as broad antimicrobial agents, anti-biofilm agents and as biocides and corrosion inhibitors for environmentally isolated and enriched Pseudomonas sp. This work will provide a solution for the metal corrosive effect of slime-forming bacteria by combining two powers in a product: different metal nanoparticles capped by a newly synthesized cationic surfactant
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