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Nanomaterials (Basel). 2021 Apr 08;11(4). doi: 10.3390/nano11040947.

Towards Universal Stimuli-Responsive Drug Delivery Systems: Pillar[5]arenes Synthesis and Self-Assembly into Nanocontainers with Tetrazole Polymers.

Nanomaterials (Basel, Switzerland)

Dmitriy N Shurpik, Lyaysan I Makhmutova, Konstantin S Usachev, Daut R Islamov, Olga A Mostovaya, Anastasia A Nazarova, Valeriy N Kizhnyaev, Ivan I Stoikov

Affiliations

  1. A. M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaya, 18, 420008 Kazan, Russia.
  2. Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya, 18, 420008 Kazan, Russia.
  3. FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Institute of Organic and Physical Chemistry, Arbuzov St., 8, 420088 Kazan, Russia.
  4. Department of Theoretical and Applied Organic Chemistry and Polymerization Processes, Irkutsk State University, K. Marksa, 1, 664003 Irkutsk, Russia.

PMID: 33917874 PMCID: PMC8068209 DOI: 10.3390/nano11040947

Abstract

In this work, we have proposed a novel universal stimulus-sensitive nanosized polymer system based on decasubstituted macrocyclic structures-pillar[5]arenes and tetrazole-containing polymers. Decasubstituted pillar[5]arenes containing a large, good leaving tosylate, and phthalimide groups were first synthesized and characterized. Pillar[5]arenes containing primary and tertiary amino groups, capable of interacting with tetrazole-containing polymers, were obtained with high yield by removing the tosylate and phthalimide protection. According to the fluorescence spectroscopy data, a dramatic fluorescence enhancement in the pillar[5]arene/fluorescein/polymer system was observed with decreasing pH from neutral (pH = 7) to acidic (pH = 5). This indicates the destruction of associates and the release of the dye at a pH close to 5. The presented results open a broad range of opportunities for the development of new universal stimulus-sensitive drug delivery systems containing macrocycles and nontoxic tetrazole-based polymers.

Keywords: drug delivery systems; fluorescein; pillar[5]arene; tetrazole

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