Long-lived excited state of spiroanthroxazine after its matrix isolation in halogenated polyolefins by supercritical fluid impregnation

The presented paper is focused on impregnation of chitosan and its derivatives with a biologically active triaryl imidazole model compound ((2-2-hydroxyphenyl)-4.5-diphenyl-1H-imidazole) in the supercritical carbon dioxide medium. Since initial chitosan represents a polycation-exchange resin and does not swell in supercritical carbon dioxide, the impregnation was carried out in the presence of water (0.15-3.0 vol%). The maximum 2-2-hydroxyphenyl)-4.5-diphenyl-1H-imidazole concentration in a chitosan film was achieved at the ~5 × 10(-3) g/cm(3) water content in the reactor. We also used hydroxy carboxylic acid derivatives of chitosan and its copolymer with polylactide as matrices for introduction of hydrophobic 2-2-hydroxyphenyl)-4.5-diphenyl-1H-imidazole. We have shown that unmodified chitosan contains the greatest amount of 2-2-hydroxyphenyl)-4.5-diphenyl-1H-imidazole, as compared with its hydrophobic derivatives. The kinetics of 2-2-hydroxyphenyl)-4.5-diphenyl-1H-imidazole diffusion from a chitosan matrix was studied in acidified water with pH 1.6. We found that the complete release of 2-2-hydroxyphenyl)-4.5-diphenyl-1H-imidazole into the aqueous phase from unmodified chitosan films occurred in 48 h, while its complete release from chitosan modified with hydroxy carboxylic acids occurred in 5 min or less.

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Supercritical fluids in chemistry

Алексеев

Alentiev

Belova

et al. 2020

Russ. Chem. Rev.

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Long-lived excited state of spiroanthroxazine after its matrix isolation in halogenated polyolefins by supercritical fluid impregnation

Cited by 6 publications

References 2 publications

Synthesis of nanostructured materials using supercritical CO2: Part I. Physical transformations

Synthesis of nanostructured materials using supercritical CO2: Part I. Physical transformations

Chitosan impregnation with biologically active tryaryl imidazoles in supercritical carbon dioxide

Supercritical fluids in chemistry

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