“…Several stillbenes derivatives from natural and synthetic sources (Figure 8) have been investigated for their tyrosinase inhibition activity including: resveratrol from Morus alba 319 , Pleurotus ferulae 135 , vitis viniferae caulis 320 , Carignan grape juice 321 Artocarpus gomezianus 322 and Streptomyces avermitilis MA4680 323 and also, its derivatives fro m Dipterocarpaceae plants 324 and synthetic sources 325 , oxyresveratrol 326 from Morus australis 327 , Morus alba L (IC 50 = 0.10 ± 0.01 µM) 249 and Cudrania cochinchinensis (IC 50 = 2.33 µM) 255 , azo-resveratrol and its derivatives such as (E)-2-((2,4-dihydroxyphenyl)diazenyl) phenyl 4 methylbenzenesulfonate 328 and azo -oxyresveratrol 329 , trans -resveratrol from Streptomyces avermitilis MA4680 313 , a resveratrol dimer named gnetin C, from melinjo (Gnetum gnemon ) 330 . Also, several hydroxystillbene compounds from synthetic and semisynthetic sources 331 , 332 and from the extract of Veratrum patulum 333 , along with synthetic glycosides of resveratrol, pterostilbene, and pinostilbene 334 , synthetic trans-stilbene derivatives 335 , azastilbene analogs 336 , a newly synthesised stillbene 5-(6-hydroxy-2-naphthyl)-1,2,3-benzenetriol 337 , coumarin-resveratrol hybrids 290 , synthetic polyphenolic deoxybenzoins 218 , hydroxy substituted 2-phenyl-naphthalenes 338 and 4-(6-hydroxy-2-naphthyl)-1,3-bezendiol 339 have been studied for their inhibition activity against tyrosinase. However, based on the enzymatic assays, resveratrol did not inhibit the diphenolase activity of tyrosinase, but L-tyrosine oxidation by tyrosinase was suppressed in presence of 100 µM resveratrol.…”