“By using ferricyanide ion as the oxidant in pH … phosphate buffer at 22 degrees C, caffeic acid, chlorogenic acid , (+) catechin, and (-) epicatechin were … to react with methionine and phenylalanine to produce Strecker aldehydes methional and phenylacetaldehyde in 0.…-0.42% molar yields (0.7-10 ppm in reaction mixtures).”