Fuente: WIPO "tomato" Described herein are a carboxymethylated lysine-based polymer including (A) 60 to 99 mol % of structural units from lysine monomer, and (B) 1 to 40 mol % of structural units from at least one dicarboxylic acid of formula (I) HOOC—R1—COOH or amide-forming derivative thereof, where R1 is a direct bond or an aliphatic linear hydrocarbylene and a process for preparing the same. Described herein are a detergent composition and a peroxy bleaching composition including the carboxymethylated lysine-based polymer.