酱油除含多氨基酸的肽外,尚含有黑精(黑色素),此二者具有很强的氧化能力,尤其对亚油酸的过氧化有抑制作用,而过氧化被认为是促衰的重要因素。另据日本最近的一项研究发现,豆酱及其酱油更是美化肌肤的一种良药。日本农林水产省食品综合研究所食品功能部研究室证室,日本豆酱中含有一种物质能够抑制黑色素的合成。在此之前,食品功能部曾对多种蔬菜和其它食品进行过实验,从中发现了一些抑制黑色素合成的成分。黑色素是一种能使皮肤变黑的色素。皮肤受到紫外线照射时,就会促进皮肤黑色素的分泌,使之变黑。他们对小鼠进行试验,给小鼠的合成黑色素的细胞上添加从豆酱中提取的 Soy sauce contains polyamino acid peptides in addition, but also contains melanin (melanin), both of which have a strong oxidizing ability, especially for linoleic acid has an inhibitory effect on peroxide, and peroxide is considered an important factor in promoting decline . According to a recent study in Japan found that soy sauce and soy sauce is a good medicine to beautify the skin. Japanese Ministry of Agriculture, Forestry and Fisheries Food Research Institute of Food Function Room, Japan soy sauce contains a substance that can inhibit the synthesis of melanin. Prior to this, the Food Functional Department had experimented with a variety of vegetables and other food products and found some ingredients that inhibit melanin synthesis. Melanin is a pigment that darkens the skin. When the skin is exposed to ultraviolet light, it will promote the secretion of the skin melanin, make it black. They tested mice and added melanin-derived cells extracted from bean paste