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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]