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. 2020 Mar 11;5(11):5772–5780. doi: 10.1021/acsomega.9b03846

Figure 2.

Figure 2

FTIR spectra of the native collagen and collagens modified with PAA-NHS esters (a); SDS-PAGE of native collagen and collagens modified with PAA-NHS esters (b): lane (1) protein marker; (2) native collagen; (3) collagen modified with PAA-NHS(1/5); (4) collagen modified with PAA-NHS(1/2); (5) collagen modified with PAA-NHS(1/1); and (6) collagen modified with PAA-NHS(2/1); schematic illustrating the permeation of the native collagen and the modified collagen molecules through the micropores of electrophoresis gel (c).