Biotransformation of mulberroside A from Morus alba results in enhancement of tyrosinase inhibition

J Ind Microbiol Biotechnol. 2010 Jun;37(6):631-7. doi: 10.1007/s10295-010-0722-9. Epub 2010 Apr 22.


Mulberroside A, a glycosylated stilbene, was isolated and identified from the ethanol extract of the roots of Morus alba. Oxyresveratrol, the aglycone of mulberroside A, was produced by enzymatic hydrolysis of mulberroside A using the commercial enzyme Pectinex. Mulberroside A and oxyresveratrol showed inhibitory activity against mushroom tyrosinase with an IC(50) of 53.6 and 0.49 microM, respectively. The tyrosinase inhibitory activity of oxyresveratrol was thus approximately 110-fold higher than that of mulberroside A. Inhibition kinetics showed mulberroside A to be a competitive inhibitor of mushroom tyrosinase with L-tyrosine and L-DOPA as substrate. Oxyresveratrol showed mixed inhibition and noncompetitive inhibition against L-tyrosine and L-DOPA, respectively, as substrate. The results indicate that the tyrosinase inhibitory activity of mulberroside A was greatly enhanced by the bioconversion process.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Agaricales / enzymology
  • Biotransformation
  • Disaccharides / isolation & purification
  • Disaccharides / metabolism*
  • Disaccharides / pharmacology
  • Enzyme Inhibitors / metabolism*
  • Enzyme Inhibitors / pharmacology
  • Monophenol Monooxygenase / antagonists & inhibitors*
  • Monophenol Monooxygenase / metabolism
  • Morus / metabolism*
  • Plant Extracts / metabolism
  • Stilbenes / isolation & purification
  • Stilbenes / metabolism*
  • Stilbenes / pharmacology


  • Disaccharides
  • Enzyme Inhibitors
  • Plant Extracts
  • Stilbenes
  • mulberroside A
  • puag-haad
  • Monophenol Monooxygenase