抄録
The authors reported previously that thiamine decomposing, thermostable factor was isolated from peanut seed coat and that this was found as tannin which was contained in materials.
In this paper we determined the tannin contents of various daily-used foods, and demonstrated that the tannin in foods caused the decrease in thiamine content during heat treatment. Further studies showed that precipitate was produced in solution of thiamine and tannin mixture when hydrogen ion concentration was brought at higher pH than 5. And two spots of thiamine and tannin was detected when the precipitate was run by paper electrophoresis.
