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. 2023 Dec 6;13(24):3090. doi: 10.3390/nano13243090

Figure 4.

Figure 4

1H-NMR spectra of the Lys-Arg samples prepared with increasing amounts of L-arginine. The blue arrows highlight the changes in the α-CH group involved in the amide bonding. The spectrum of BAA is reported as reference. The blue arrows show the progressive growth and shift of the α-CH2 groups next to the amide bonds of L-lysine.