Abstract
A series of four water-soluble chitosan derivatives differing in molecular mass, hydrophobicity, and charge was synthesized and tested for the intensity of their effects on Gram-negative and Gram-positive bacteria. It was shown that the tested compounds allowed the penetration of ethidium bromide into the bacteria, which showed increased permeability of their cell walls under the effect of chitosans. The tolerance to various chitosan derivatives differed in Gram-negative and Gram-positive bacteria. The Gram-negative bacteria were the most responsive to high-molecular chitosan and the Gram-positive ones, to N-,O-carboxypropylchitosan, whereas high-molecular chitosan had little effect. Research on the correlation between the structure and activity of the studied compounds revealed that depolymerization of chitosan reduced, and introduction of hydrophobic substantives in chitosan molecule significantly enhanced its permeability effect on bacterial cell walls. The obtained results provide a basis for the construction of new chitosan derivatives with antimicrobial activities.
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Original Russian Text © G.A. Naberezhnykh, S.I. Bakholdina, V. I. Gorbach, T.F. Solov’eva, 2009, published in Biologiya Morya.
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Naberezhnykh, G.A., Bakholdina, S.I., Gorbach, V.I. et al. New chitosan derivatives with potential antimicrobial activity. Russ J Mar Biol 35, 498–503 (2009). https://doi.org/10.1134/S106307400906008X
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DOI: https://doi.org/10.1134/S106307400906008X