Abstract: Disclosed herein is a whitening cosmetic composition containing plant-derived ginsenoside F1 (20-O-?-D-glucopyranosyl-20(S)-protopanaxatriol) as an active ingredient. More specifically, the ginsenoside F1 is obtained from particularly a ginseng extract using an acid, a base, an enzyme or microorganism, and a whitening cosmetic composition containing the ginsenoside F1 has an excellent effect of inhibiting melanin biosynthesis, and thus provides an excellent skin whitening effect.

Abstract: Disclosed is a composition for promoting a production of hyaluronic acid containing at least one of kaempferol and quercetin. Kaempferol and quercetin of the invention increase an expression of a hyaluronic acid synthase (HAS) gene existing in a skin cell line of human epidermis, thereby promoting a production of hyaluronic acid in the human cell. Accordingly, the composition containing at least one of kaempferol and quercetin according to the invention can be usefully used as a cosmetic composition for increasing skin elasticity and preventing skin dryness or aging, or a pharmaceutical composition for treating or preventing a degenerative arthritis.

Abstract: Disclosed herein is a whitening cosmetic composition containing plant-derived ginsenoside Fl (20-O-?-D-glucopyranosyl-20(S)-protopanaxatriol) as an active ingredient. More specifically, the ginsenoside Fl is obtained from particularly a ginseng extract using an acid, a base, an enzyme or microorganism, and a whitening cosmetic composition containing the ginsenoside Fl has an excellent effect of inhibiting melanin biosynthesis, and thus provides an excellent skin whitening effect.

Abstract: Disclosed is a composition for promoting a production of hyaluronic acid containing at least one of kaempferol and quercetin. Kaempferol and quercetin of the invention increase an expression of a hyaluronic acid synthase (HAS) gene existing in a skin cell line of human epidermis, thereby promoting a production of hyaluronic acid in the human cell. Accordingly, the composition containing at least one of kaempferol and quercetin according to the invention can be usefully used as a cosmetic composition for increasing skin elasticity and preventing skin dryness or aging, or a pharmaceutical composition for treating or preventing a degenerative arthritis.

Abstract: Disclosed is a kaempferol preparing method comprising isolating kaempferol from kaempferol glucosides using an acid, a base, an enzyme or a microbe producing the enzyme. More specifically, the method comprises obtaining a plant extract containing kaempferol glycosides from a plant using water or an organic solvent; and hydrolyzing the plant extract using an acid, a base, an enzyme or a microbe producing the enzyme to isolate kaempferol. The kaempferol glycosides comprise camelliaside A or camelliaside B. The plant extract is derived from a seed or leaf of green tea. When using the method of the invention, it is possible to mass-produce kaempferol, which is one of main physiological activating ingredients, from a plant, particularly a seed or leaf of green tea.