Figure 2.

During wet-dry cycling, oligomerization of α-amino acids is favored over oligomerization of β-amino acids. Differences between amino acid conversion percentage under dry-down conditions and wet–dry cycling are illustrated. Positive values indicate greater extent of conversion under dry-down conditions, while negative values indicate greater extent of conversion under wet–dry cycling. Reproduced with permission from ref (58). Copyright 2022 MDPI, Basel, Switzerland.