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Table 1 Analysis of secondary structures of polypeptide by using Xpeak software

From: Alpha-beta transition induced by C18-conjugation of polyalanine and its implication in aqueous solution behavior of poly(ethylene glycol)-polyalanine block copolymers

polymer α helix/β sheet/ random coil
(20 °C)
α helix/β sheet/ random coil
(50 °C)
PEG-PA 48/31/21 46/28/26
PEG-PAO 34/44/22 33/39/28
PEG-PAS 33/45/21 32/41/27
  1. β sheet: 1625 and 1633 cm− 1, random coil: 1646 cm− 1 [8, 9]