2024 Volume 20 Pages 78-88
The tip of leaf blade from Green onion (Allium fistulosum L.) has been cut and thrown away for distribution. In order to utilize the discarded leaf blade parts, the effect of its ingestion on photoaging skin has been studied. The skin aging model has made by UVB irradiated hairless mice to increase intensity gradually. The photoaging skin mice were orally administered of ground leaf blade and water extracts of leaf blade from green onions, and the moisture contents and transepidermal water loss (TEWL) of photoaging mice back skins were measured. To analyze the constituents of the green onion extract, the extract was analyzed using reversed-phase chromatography, mass spectrometry, and thin-layer chromatography. Administration of crushed green onion and green onion extracts to a photoaging mice inhibited the decrease in back skin water content and epidermal thickening, both of which had been produced by UV exposure. In addition, in the green onion aqueous extract inhibited the formation of wrinkles in the back skin and increased the amount of type I collagen. Component analysis of green onion extract showed the presence of glucose-containing polymers. It was also revealed that the green onion extracts do not contain quercetin. So it has been suggested that components other than quercetin in green onions suppress the photoaging skin.
