Sugar-responsive pseudopolyrotaxane composed of phenylboronic acid-modified polyethylene glycol and γ-cyclodextrin

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Abstract

We have designed a sugar-responsive pseudopolyrotaxane (PPRX) by combining phenylboronic acid-modified polyethylene glycol (PBA-PEG) and γ-cyclodextrin. Phenylboronic acid (PBA) was used as a sugar-recognition motif in the PPRX because PBA reacts with a diol portion of the sugar molecule and forms a cyclic ester. When D-fructose or D-glucose was added to a suspension of PPRX, PPRX disintegrated, depending on the concentration of the sugars. Interestingly, catechol does not show a response although catechol has a high affinity for PBA. We analyzed the response mechanism of PPRX by considering equilibria.

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Seki, T., Namiki, M., Egawa, Y., Miki, R., Juni, K., & Seki, T. (2015). Sugar-responsive pseudopolyrotaxane composed of phenylboronic acid-modified polyethylene glycol and γ-cyclodextrin. Materials, 8(3), 1341–1349. https://doi.org/10.3390/ma8031341

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