Keywords: قرمز بروموپیگارالول; Catalytic activity; Gold nanoparticles; Peroxidase; Pyrogallol; Bromopyrogallol red; Borate complexes; BPR; bromopyrogallol red; PG; pyrogallol; HBPG@AuNPs; hyperbranched polyglycidol-stabilized gold nanoparticles; HRP; horseradish peroxidase; DTPA; dieth