An evaluation of extracts of five traditional medicinal plants from Iran on the inhibition of mushroom tyrosinase activity and scavenging of free radicals

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Abstract
Synopsis: This study aimed to evaluate the free radical scavenging and inhibition properties of five medicinal plants, including Quercus infectoria Olive., Terminalia chebula Retz., Lavendula stoechas L., Mentha longifolia L., Rheum palmatum L., toward the activity of mushroom tyrosinase using l‐tyrosine and l‐3,4‐dihydroxyphenylalanine (l‐DOPA) as the substrate. The methanol extracts of Q. infectoria and T. chebula showed strong radical scavenging effect in 2,2′‐dipheny l‐1‐picrylhydrazyl (DPPH) assay (IC50 = 15.3 and 82.2 μg mL−1 respectively). These plants also showed inhibitory effects against the activity of mushroom tyrosinase in hydroxylation of l‐tyrosine (85.9% and 82.2% inhibition, respectively). These two plants also inhibited the oxidation of l‐DOPA similar to kojic acid as positive control (IC50 = 102.8 and 192.6 μg mL−1 respectively). In general Q. infectoria and T. chebula significantly inhibited tyrosinase activity and DPPH radical. Both activities were concentration‐dependant but not in linear manner. It is needed to study the cytotoxicity of these plant extracts in pigment cell culture before further evaluation and moving to in vivo conditions.

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