“The inhibition of photolysis of riboflavin in the presence of caffeine is a result of the monomeric interaction and complex formation of caffeine with riboflavin.”
“The k'-pH profile for the interaction of riboflavin with caffeine represents a bell-shaped curve in the pH range 3-6 followed by a sigmoid curve in the pH range 7-10.”
“The photochemical interaction of riboflavin with caffeine suggests that a pH around 6 is most appropriate for the stabilization of the vitamin.”