13C CP/MAS NMR Spectroscopic Characterization of Native Silk Fibers
Differences in secondary structure among Bombyx mori (B. mori) silk and two wild silks of Antheraea yamamai (A. yamamai) and Antheraea pernyi (A. pernyi) were investigated by CP/MAS 13C NMR Spectroscopy. The β-sheet structure was primary in three silk, and B. mori silk had the highest β-sheet structure. Although amino acid compositions are very similar for two wild silk, their secondary structures had significant difference. A. yamamai silk contained more α-helix structure, whereas more β-turn and random coil structures formed in A. pernyi silk. B. mori silk was mainly composed of anti-parallel β-sheet structure, however, the parallel β-sheet structure was advantage in the two wild silks, and A. yamamai silk contained more anti-parallel β-sheet conformation than A. pernyi silk.
Lun Bai and Guo-Qiang Chen
W. Zhang et al., "13C CP/MAS NMR Spectroscopic Characterization of Native Silk Fibers", Advanced Materials Research, Vols. 175-176, pp. 328-332, 2011