melanin

Melanin is a multifunctional biotin and a powerful cation chelator with antimicrobial, antioxidant and antiradiation activities.

Gnetol competitivity inhibits butyrylcholinesterase (IC50: 1.3 uM). Gnetol has a strong inhibitory effect on murine tyrosinase activity. Gnetol significantly suppresses melanin biosynthesis in murine B16 melanoma cells. It is active in the inhibition of a

Velutin shows the strongest inhibitory effect in NF-κB activation and exhibits the greatest effects in blocking the degradation of inhibitor of NF-κB as well as in inhibiting mitogen-activated protein kinase p38 and JNK phosphorylation. Velutin has anti-inflammatory property. Velutin exhibits the greatest potency among all flavones which reduce TNF-α and IL-6 production.

Eupalinolide B is a natural product ,and demonstrates potent cytotoxicity against A-549, BGC-823, SMMC-7721, and HL-60 tumour cell lines.

Raspberry ketone glucoside, a natural compound found in raspberry fruit, exhibits prolonged inhibition of melanogenesis and various melanogenic factors following its degradation in the skin.

2-Thiouracil (Deracil) is a thiolated uracil derivative that is a known anti-hyperthyroid agent.

D-Phenylalanine, a necessary aromatic amino acid, is a precursor of thyroxine, dopamine, melanin, and noradrenaline (norepinephrine).

Methyl pentadecanoate is a natural product.

Methyl 4-hydroxycinnamate is an esterified derivative of p-coumaric acid isolated from the flowers of Trixis michuacana var. longifolia, exhibiting antibacterial and anti-melanogenesis properties.

Arbutin (p-Arbutin)(β-Arbutin) is a glycosylated hydroquinone extracted from the bearberry plant in the genus Arctostaphylos and can inhibit tyrosinase and thus prevent the formation of melanin.

5,6-Dihydroxyindole (Dopamine lutine) is a melanin precursor and has a broad-spectrum antibacterial, antiviral, antifungal, antiparasitic activity. It has cytotoxic effects and is strongly toxic against various pathogens.

Kojic acid is a fungal metabolite that inhibits tyrosinase, an enzyme involved in melanin synthesis, with an IC50 value of 30.6 μM for mushroom tyrosinase.

D-Tyrosine, the D-isomer of tyrosine, acts as a negative regulator of melanin synthesis by inhibiting tyrosinase activity. Furthermore, D-Tyrosine also inhibits biofilm formation and induces the self-dispersal of biofilms, while not affecting bacterial growth.

Rhododendrol (Frambinol) is a melanin synthesis and acts by preventing high-fat diet-induced elevation in body weight and increasing lipolysis in white adipocytes in male mice. Rhododendrol can be used as the lightening whitening cosmetics inhibitor.

Methyl myristate (methyl tetradecanoate) is a natural product.

γ-Oryzanol (Gamma-Oryzanol) is a natural nutrient extract isolated from rice bran oil that contains a mixture of sterols and ferulic acids, which may aid in the destruction of free radicals in the skin. It has recently been researched for its ability to slow the progress of melanin pigmentation by intercepting the ultraviolet rays at the skin's surface and hindering their transmission.

Glycolic acid, an inhibitor of tyrosinase, suppresses melanin formation and is used in skincare products.

Methyl Linoleate (Telfairic Acid methyl ester) linoleate has antioxidant activity.

4,5,6,7-Tetrachlorophthalide is a fungicide used for the control of rice blast. It has a role as a melanin synthesis inhibitor and an antifungal agrochemical.

Fupenzic acid shows a significant decrease in intracellular melanin content in B16-F10 cells, and in culture media melanin.

Ohchinin exhibits potent inhibitory activities with 26 - 66% reduction of melanin content at 100 μm concentration with almost no or low toxicity to the B16 melanoma cells (70 - 99% cell viability at 100 μm).

12-O-Methylcarnosic acid is a diterpene carnosic acid isolated from Salvia microphylla, is an active constituent of 5α-Reductase inhibition with an IC50 value of 61.7 μM. 12-O-Methylcarnosic acid has Antioxidant activity, it is effective preventing gastric lesions. 12-O-Methylcarnosic acid can suppress melanin production with downregulation of Tyrosinase expression in HMV-II melanoma cells. 12-O-Methylcarnosic acid may have anti-diabetic activity, it is able to significantly activate peroxisome proliferator-activated receptor (PPAR)γ.

1. N-trans-Feruloyltyramine (Feruloyltyramine)(NTF) has hepatoprotective effect. 2. NTF has antioxidative activity against Aβ(1-42)-induced neuronal death. 3. NTF is likely to inhibit COX enzymes, thereby suppressing P-selectin expression on platelets, is a platelet aggregation inhibitor. 4. NTF inhibits melanogenesis in a dose-dependent manner, NTF induces downregulation of tyrosinase resulted in suppression of melanin biosynthesis in murine B16 melanoma cells.

Trans-caffeic acid stearyl ester is posited to inhibit melanogenesis signaling while suppressing cAMP levels and, subsequently, MC1R, MITF, tyrosinase, TRP-2 and TRP-1 down-regulation, resulting in the suppression of tyrosinase activity, DOPA oxidase activity and melanin synthesis.