The browning occurring in treated juice may be due to the degradation of ascorbic acid and other juice constituents during the process of concentration. Kacem et al. (1987) also demonstrated that the amino acid content below 0.66% did not significantly affect browning of orange juice. Thus, the removal of amino acids from orange juice by cation exchange resin treatment brought about a marked reduction in the non-enzymatic browning of orange juice during the process of evaporative concentration, thereby improving its appearance and acceptability.