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Cyanobacteria contain substances of high biological value and are used to meet the high demands of the global food and pharmaceutical industries. In this study, we prepared a hot water extract of the edible cyanobacterium, Nostochopsis, and evaluated its possible use as an ingredient in cosmetics. Specifically, a hot water extract of Nostochopsis was assayed for tyrosinase inhibitory activity. Tyrosinase, a key enzyme in skin melanin synthesis, was strongly inhibited by the Nostochopsis hot water extract, which reduced α-melanocyte-stimulating hormoneinduced melanin synthesis in B16 mouse melanoma cells. Thus, Nostochopsis hot water extract may be suitable as an ingredient in cosmetics.

Characterization of a Hot Water Extract of an Edible Cyanobacterium Nostochopsis sp. for Use as an Ingredient in Cosmetics