Figure 7. Tryptophan and nontryptophan fluorescence of αL-crystallin modified by fructose 6-phosphate

Carnosine enhanced the loss of tryptophan fluorescence. Nontryptophan fluorescence was continuously increased with a shift to longer wavelengths in the presence of fructose 6-phosphate (F6P) alone, and more so with carnosine. A: 15 days tryptophan. B: 25 days tryptophan. C: 15 days nontryptophan. D: 25 days nontryptophan.