Antiseptic chitosan bandage for preventing topical skin infections

Modification of nonwoven polymer materials for increasing of their filtration and antibacterial properties

“…When coating with OCT, absorption bands appear in the spectrum of the sample in the range of 3500–3000 cm −1 and 1600–1500 cm −1 , which are characteristic for the initial OCT powder (Figure 3). The 3500–3000 cm −1 region is responsible for the stretching vibrations of the immine NH and secondary amine NH groups, the vibrations in the region of 1600–1500 cm −1 are associated with valence bonds of CC and CN groups in pyridine rings, the presence of which in the spectra proves the preservation of the structure of the substance 34–37 …”

“…The FT-IR spectrum of OCT has an absorption band at 3420 cm À1 , corresponding to the stretching vibrations of the NH-group of the ammonium salt, as well as bands at 1624-1615 cm À1 , 1600-1575 cm À1 , 1565-1540 cm À1 , associated with the stretching vibrations of the aromatic rings. [34][35][36][37] The target was dispersed by an electron beam with an energy of 800-1600 eV and a current density of 0.01-0.03 A cm À2 . Coating was carried out at an initial pressure of residual gases in a vacuum chamber of ≈4 Â 10 À3 Pa.…”

“…PTFE (Sigma Aldrich), metallic zinc powder (Sigma Aldrich), and OCT powder synthesized by the authors were used as targets for electron beam dispersion. The FT‐IR spectrum of OCT has an absorption band at 3420 cm −1 , corresponding to the stretching vibrations of the NH‐group of the ammonium salt, as well as bands at 1624–1615 cm −1 , 1600–1575 cm −1 , 1565–1540 cm −1 , associated with the stretching vibrations of the aromatic rings 34–37 …”

“…The 3500-3000 cm À1 region is responsible for the stretching vibrations of the immine NH and secondary amine NH groups, the vibrations in the region of 1600-1500 cm À1 are associated with valence bonds of C C and C N groups in pyridine rings, the presence of which in the spectra proves the preservation of the structure of the substance. [34][35][36][37] For samples modified with PTFE, absorption bands are observed in the region of 1000-1220 cm À1 , which are characteristic for stretching vibrations of С С and С F 2 bonds with an absorption maximum at 1185 cm À1 , which is characteristic for asymmetric bending vibrations of С F groups. 46 F I G U R E 2 SEM images of Aquaspun samples (A), modified by EBD method with PTFE (B), OCT (D), and ZnO (F); EDA of selected areas of samples modified with PTFE (C), OCT (E), and ZnO (G).…”

“…For a sample with an OCT coating, low-intensity absorption bands appear in the range of 3500-3000 cm À1 is responsible for stretching vibrations of immine NH and secondary amine NH groups (Figure 3), vibrations in the region of 1600-1500 cm À1 are associated with valence bonds of C C and C N groups in pyridine rings. [34][35][36][37]…”