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Abstract
The tyrosinase-inhibitory activity of 15 kinds of Bangladeshi medicinal plants was evaluated. Methanol extracts were prepared for screening tests, and other kinds of extracts were also studied for those with high activity. Swertia chirata, Piper nigrum, Glycyrrhiza glabra, Piper longam and Ocimum americanum were screened as highly inhibiting samples. Methanol was found to be the most efficient solvent for extracting the active compounds. The 50% tyrosinase-inhibitory concentration of the Glycyrrhiza glabra methanol extract was 21.2 μg/ml.