Use of Magnolia grandiflora l.flower extract for whitening composition is disclosed. The used of Magnolia grandiflora L.flower extract can inhibit melanin and thereby high efficacy for skin whitening. A method of extracting Magnolia grandiflora L.flower comprising the steps of: providing 2.5 to 3.0 kg of Magnolia and remove magnolia leaf. Magnolia leaf mixed with an aqueous solution of 750 to 850 ml, placed in a temperature of 65 ~ 75 ℃ seal boiler for distillation. After distillation 48H, the seal boiler is naturally cooled to room temperature. Collected steam droplets inside the seal boiler, and get 600 to 700 ml of water extract of magnolia leaf. The water extract ripening in the wind barrel of 2 to 3 months, and get an extract original liquid of magnolia leaf.一種玉蘭花瓣萃取液作為美白組合物之用途。所述玉蘭花瓣萃取液可抑制黑色素(melanin)的生成,以提供良好的美白功效。玉蘭花瓣萃取液的萃取方法,其步驟包括:提供2.5~3.0公斤的玉蘭花,並取下玉蘭花的玉蘭花瓣。將玉蘭花瓣與750~850毫升的水溶液充分混合後,置於溫度65~75℃的密閉式鍋爐內進行蒸餾。蒸餾48H後將密閉式鍋爐自然冷卻至室溫。收集密閉式鍋爐內的蒸氣純露,得到玉蘭花瓣的水萃液600~700毫升。將玉蘭花瓣的水萃液,置於風桶內進行2~3個月的香氣熟化,得到玉蘭花辦的萃取液原液。指定代表圖為流程圖,故無元件符號簡單說明。
