228 Part II: Water, Enzymology, Biotechnology, and Protein Cross-linking
Figure 9.3.Formation of melanoidin-type colorants on reaction of (A)Protein-bound lysine with furan-2-aldehyde
(Hofmann 1998b). (B)Two protein-bound arginine residues with glyoxal in the presence of carbonyl compound
(Hofmann 1998a). (C)Two protein-bound lysine residues with glycolaldehyde or glyoxal (in the presence of ascor-
bate) (Hofmann et al. 1999). Product of reaction of (D)Propylamine with glucose (Knerr et al. 2001). (E)Butylam-
inammonium acetate with glucose (Lerche et al. 2003). (R remainder of the carbonyl compound).