The plant materials used were leaves, stems, peels and seeds of sweet granadilla (Passiflora ligularis Juss) obtained from Batu Dalam village, Danau Kembar sub-district, Solok district, West Sumatera province and determined at Herbarium Bogoriensis, LIPI, Indonesia.
ChemicalChemicals used include the enzyme tyrosinase (Sigma Aldrich), gallic acid, quercetin, ascorbic acid, kojic acid, 3,4-Dihydroxy-L-phenylalanine (L-DOPA)