Bioorganic and Medicinal Chemistry Letters, cilt.21, sa.24, ss.7479-7482, 2011 (SCI-Expanded, Scopus)
A newly series of 4-(phenylurenyl)chalcone (4a-j) and 4′- (phenylurenyl/thiourenyl)chalcone (9a-l) derivatives were synthesized and their inhibitory effects on the diphenolase activity of banana tyrosinase were evaluated. Tyrosinase has been purified from banana on an affinity gel comprised of Sepharose 4B-l-tyrosine-p-aminobenzoic acid. The result showed that 4a-j inhibited the PPO enzyme activity. Conversely, 9a-h and 9i-l showed activator effect on tyrosinase enzyme activity. © 2011 Elsevier Ltd. All rights reserved.