在酱油厂工作的制曲工人双手白皙如玉,哪怕到了老年,也没褐斑出现。这一现象引起了食品界及医学界人士的兴趣。经研究,在制曲操做过程中,接触到一种曲霉酸代替产物。它对人体皮肤产生的褐色素酷氨酸脂能起抑制作用。日本以曲酸 Work in the soy sauce factory workers hands white jade, even to the elderly, nor brown spots appear. This phenomenon has aroused the interest of food and medical professionals. After the study, in the koji operation process, exposed to a kind of kojic acid instead of the product. It inhibits the production of brown fat, tryptophan, on human skin. Japanese kojic acid