Abstract

A method for the physicochemical modification of the structure of gelatinous films is proposed. For this purpose, molecular-recognition-based self-assembly was used: the formation of (bio)polymolecular complexes between gelatin and chitosan owing to the interactions of the main amino acid residues in gelatin and acidic amino groups in the structure of chitosan (cooperative polyelectrolyte interaction). The use of a gelatin–chitosan matrix made it possible to significantly increase the luminescence yield of the dyes introduced into the biopolymer. This was due to the more efficient filling of the corresponding binding gelatin sites with dye molecules and, consequently, minimization of the concentration quenching of fluorescence. In the film samples of gelatin–chitosan matrix–dye, effective superluminescence of sulforhodamine B was achieved.

© 2019 Optical Society of America

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