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Amino-acid-based metallo-hydrogel that acts like an esterase

Gayen, K., Basu, K., Bairagi, D., Castelletto, V., Hamley, I. W. and Banerjee, A. (2018) Amino-acid-based metallo-hydrogel that acts like an esterase. ACS Applied Bio Materials, 1 (5). pp. 1717-1724. ISSN 2576-6422

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To link to this item DOI: 10.1021/acsabm.8b00513

Abstract/Summary

A histidine-based amphiphile containing a C14 fatty acyl chain, N- histidyl N′-myristry ethyl amine (AM1, 14.7 mM) forms hydrogels in the presence of Fe3+ (within the range 1.47 to 4.41 mM) and Hg2+ (within the range 3.67 to 11.02 mM) ions in aqueous dispersions at pH 6.6 (27 °C). The imidazole ring of the histidine residue plays a vital role to interact with these metal-ions. The thermal and mechanical stability of these metallo-hydrogels can be tuned by changing the proportion of amphiphile to metal ion ratio (1:0.1 to 1:0.3 for Fe3+-containing gel and 1:0.25 to 1:0.75 for Hg2+-containing gel). The metallo-hydrogels were characterized by different spectroscopic and microscopic techniques, low- and wide-angle powder X-ray diffraction, and small-angle X-ray scattering studies. FT-IR and NMR spectroscopic studies indicate the participation of the imidazole ring in metal-ion binding. Low- and wide-angle powder X-ray diffraction and small-angle X-ray scattering data are in favor of a layered structure of the supramolecular assembly of the AM1 in the presence of metal-ions. Both, the amphiphiles and the metal ion induced hydrogels reveal catalytic activity of p-nitrophenyl esters hydrolysis for the acetyl, n-butyl and n-octyl esters . Ferric ion containing metallo-hydrogel exhibits higher catalytic activity than the corresponding AM1 aggregate in the absence of metal ions.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:80908
Publisher:American Chemical Society (ACS)

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