Fig. 2

FTIR analysis of Col, Keratin, and Col/Keratin hydrogels (A). Data confirmed that the mixture of Col and Keratin yielded prominent peak shifting in the amide I area from 3442 cm^− 1 to 3418 cm^− 1, amide II area from 1550 cm^− 1 to 1575 cm^− 1, C-H bending vibration area from 1454 cm^− 1 to 1467 cm^− 1, and the emergence of C-H symmetric stretching vibration at 2851 cm^− 1. Monitoring gelation time in Col (0.5% w/v)/(0.5% w/v)Keratin hydrogel compared to the (0.5% w/v) Col hydrogel alone (B). The addition of Keratin to Col solution prologned the gelation time from 40 to 50 min