Oligohexamethylene Guanidine Derivative as a Means to Prevent Biological Fouling of a Polymer-Based Composite Optical Oxygen Sensor

• Published in: Polymers Vol. 15; no. 23; p. 4508
• Main Authors: Lisowski, Maxim D, Korobova, Elizaveta V, Naumova, Alina O, Sedishev, Igor P, Markova, Alina A, Nguyen, Minh Tuan, Kuzmin, Vladimir A, Nichugovskiy, Artemiy I, Arlyapov, Vyacheslav A, Yashtulov, Nikolay A, Melnikov, Pavel V
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 23.11.2023
• Subjects: antimicrobial properties; Bacteria; Biocides; Biofouling; Biomass; Biosensors; Coatings; Contact angle; Electrodes; Fourier transforms; Lipids; Microorganisms; nanostructured surface; NMR; Nuclear magnetic resonance; Nuclear magnetic resonance spectroscopy; oligohexamethyleneguanidine; optical sensor; Oxygen probes; oxygen sensor; Polymer matrix composites; Polymers; Seawater; Sensors; Spectrum analysis; surface modification; Germany; Russia; United States > US; biofouling; nanostructured surface; oligohexamethyleneguanidine; optical sensor; surface modification; antimicrobial properties; oxygen sensor; fluorinated material; adhesion control
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym15234508

The use of biocidal agents is a common practice for protection against biofouling in biomass-rich environments. In this paper, oligohexamethyleneguanidine (OHMG) polymer, known for its biocidal properties, was further modified with para-aminosalicylic acid (PAS) to enhance its properties against microorganisms coated with a lipid membrane. The structure of the product was confirmed by H NMR, C NMR, and FTIR spectroscopy. The values of the minimum inhibitory concentration (MIC) against ATCC 607 and 449 were found to be 1.40 and 1.05 μg/mL, respectively. The synthesized substance was used as an additive to the polymer matrix of the composite optical oxygen sensor material. A series of samples with different contents of OHMG-PAS was prepared using a co-dissolution method implying the fabrication of a coating from a solution containing both polymers. It turned out that the mutual influence of the components significantly affects the distribution of the indicator in the matrix, surface morphology, and contact angle. The optimal polymer content turned out to be wt.3%, at which point the water contact angle reaches almost 122°, and the fouling rate decreases by almost five times, which is confirmed by both the respiratory MTT assay and confocal microscopy with staining. This opens up prospects for creating stable and biofouling-resistant sensor elements for use in air tanks or seawater.