Thermoresponsive and Mechanical Properties of Poly(
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Olsen_Thermoresponsive.pdf
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Author(s)
Gkikas, Emmanouil
Avery, Reginald Keith
Olsen, Bradley D
Date Issued
January 2016
Journal
Biomacromolecules
Publisher
American Chemical Society (ACS)
Citation
Gkikas, Manos; Avery, Reginald K. and Olsen, Bradley D. “Thermoresponsive and Mechanical Properties of Poly(l-Proline) Gels.” Biomacromolecules 17, no. 2 (February 2016): 399–406 © 2016 American Chemical Society
Version
Author's final manuscript
Abstract
Gelation of the left helical N-substituted homopolypeptide poly(l-proline) (PLP) in water was explored, employing rheological and small-angle scattering studies at different temperatures and concentrations in order to investigate the network structure and its mechanical properties. Stiff gels were obtained at 10 wt % or higher at 5 °C, the first time gelation has been observed for homopolypeptides. The secondary structure and helical rigidity of PLP has large structural similarities to gelatin but as gels the two materials show contrasting trends with temperature. With increasing temperature in D₂O, the network stiffens, with broad scattering features of similar correlation length for all concentrations and molar masses of PLP. A thermoresponsive transition was also achieved between 5 and 35 °C, with moduli at 35 °C higher than gelatin at 5 °C. The brittle gels could tolerate strains of 1% before yielding with a frequency-independent modulus over the observed range, similar to natural proline-rich proteins, suggesting the potential for thermoresponsive or biomaterial-based applications.
MIT Department
Massachusetts Institute of Technology. Department of Biological Engineering
Massachusetts Institute of Technology. Department of Chemical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/acs.biomac.5b01168
