The reaction mixture of triose reduct one (TR) and amino acids was heated at 90℃ for 4 hrs and their absorption spectra were estimated. In general, the characteristic absorption of TR decreased after heating in all reaction system. Some differences in the variation were also observed between the 1:1 and the 1:2 reaction system of TR with amino acids, or among amino acids. Especially in the reaction system of TR with some amino acids such as methionine, threonine, glutamic acid, lysine and cysteine, the absorption of TR remarkably decreased. In addition, the increase of the absorption at near 225 and 310 nm, suggesting the production of amino reductones, was observed in all reaction system of TR and amino acids except cysteine. That was predominant in the 1:2 reaction system.