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Dr. Duke's Phytochemical and Ethnobotanical Databases
U.S. Department of Agriculture
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Tyrosinase-Inhibitor

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List of activity chemicals.
Click on column headings to sort table by that column. *Unless otherwise noted all references are to (Duke, 1992)
Chemical Name Dosage Reference
CUMINALDEHYDE ID50=0.05 mM *
GLABRIDIN *
KAEMPFEROL ID50=230 uM *
P-COUMARIC-ACID ID50=3,650 uM *
P-HYDROXYBENZALDEHYDE ID50=1.2 mM *
P-HYDROXYBENZALDEHYDE ID50=1,200 uM *
P-HYDROXYBENZYL-ALCOHOL ID50=650 uM *
PROTOCATECHUIC-ACID ID60=0.5 uM/ml *
QUERCETIN ID50=70 uM *
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List of Activity Plants.
Click on column headings to sort table by that column.
Plant Name Common Name Chemical Count Total Parts Per Million
Trigonella foenum-graecum Fenugreek; Greek Clover; Greek Hay; Bockshornklee (Ger.); Alholva (Sp.) 3 0
Triticum aestivum Wheat 4 31
Tsuga canadensis Eastern Hemlock 1 0
Turnera diffusa Damiana 1 7, 000
Tussilago farfara Coltsfoot 1 0
Umbellularia californica California Bay 1 1, 120
Uncaria catechu Gambir; Pale Catechu 1 0
Uncaria guianensis Cat's Claw; Una de Gato; Garabato Colorado; Tambor Huasca; Ungunagi 1 0
Urginea maritima European Squill 2 0
Urtica dioica European Nettle; Stinging Nettle 5 0
Vaccinium corymbosum Blueberry 3 0
Vaccinium macrocarpon Cranberry; Large Cranberry; American Cranberry 5 1, 494
Vaccinium myrtillus Bilberry; Whortleberry; Dwarf Bilberry 8 54, 000
Vaccinium vitis-idaea Cowberry; Lingen; Lingonberry 4 278, 160
Valeriana officinalis Valerian; Common Valerian; Garden-Heliotrope 3 0
Vanilla planifolia Vanilla; Bourbon Vanilla 9 4, 468
Vanilla tahitensis Tahiti Vanilla 1 0
Verbena officinalis Vervain 1 0
Vetiveria zizanioides Cus-Cus; Vetiver; Cuscus Grass 1 0
Viburnum opulus Crampbark; European Cranberry Bush; Guelder Rose; Snowballbush 4 800