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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
Pterocarpus marsupium Indian Kino; Malabar Kino; bijasal 2 0
Pueraria montana Kudzu; Kudsu 3 0
Punica granatum Pomegranate; Grenadier (Fr.); Granatapfelbaum (Ger.); Granatapfelstrauch (Ger.); Zakuro (Jap.); Romanzeiro (Port.); Granado (Sp.); Mangrano (Sp.) 5 0
Pycnanthemum pilosum Pilose Mountain Mint 1 0
Pyrus communis Pear 2 28
Quercus alba White Oak 1 0
Quercus infectoria Aleppo Oak; Dyer's Oak; Gall Oak 1 0
Quercus robur English Oak 1 0
Quercus rubra Northern Red Oak 1 0
Quercus velutina Black Oak 1 0
Raphanus sativus Radish 1 91
Rheum officinale Chinese Rhubarb 1 0
Rheum palmatum Chinese Rhubarb 2 6
Rheum rhabarbarum Rhubarb 2 44
Rhododendron dauricum Chinese Alpenrose 2 0
Rhododendron ferrugineum Rusty-Leaved Alpenrose 1 0
Rhododendron ponticum Pontic Alpenrose 1 0
Rhus coriaria Sicilian Sumac; Sumac; Tanner's Sumac 1 0
Rhus toxicodendron Poison Ivy 2 0
Rhynchosia minima Burn Mouth Vine 1 0