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Glycerin-Induced Conformational Changes in Bombyx mori Silk Fibroin Film Monitored by super(13) C CP/MAS NMR and super(1) H DQMAS NMR
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Glycerin-Induced Conformational Changes in Bombyx mori Silk Fibroin Film Monitored by super(13) C CP/MAS NMR and super(1) H DQMAS NMR
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Journal Article
Glycerin-Induced Conformational Changes in Bombyx mori Silk Fibroin Film Monitored by super(13) C CP/MAS NMR and super(1) H DQMAS NMR
2016
Overview
In order to improve the stiff and brittle characteristics of pure Bombyx mori(B. mori) silk fibroin (SF) film in the dry state, glycerin (Glyc) has been used as a plasticizer. However, there have been very limited studies on the structural characterization of the Glyc-blended SF film. In this study, super(13) C Cross Polarization/Magic Angle Spinning nuclear magnetic resonance (CP/MAS NMR) was used to monitor the conformational changes in the films by changing the Glyc concentration. The presence of only 5 wt % Glyc in the film induced a significant conformational change in SF where Silk I* (repeated type II beta -turn and no alpha -helix) newly appeared. Upon further increase in Glyc concentration, the percentage of Silk I* increased linearly up to 9 wt % Glyc and then tended to be almost constant (30%). This value (30%) was the same as the fraction of Ala residue within the Silk I* form out of all Ala residues of SF present in B. mori mature silkworm. The super(1) H DQMAS NMR spectra of Glyc-blended SF films confirmed the appearance of Silk I* in the Glyc-blended SF film. A structural model of Glyc-SF complex including the Silk I* form was proposed with the guidance of the Molecular Dynamics (MD) simulation using super(1) H- super(1) H distance constraints obtained from the super(1) H Double-Quantum Magic Angle Spinning (DQMAS) NMR spectra.
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