キノコ類のビタミンB<sub>1</sub>破壊に関する研究(第1報)

Abstract

Experiments were made on the properties of the thiamine destructive factors in twenty-five species of mushrooms, of which 0. 1g of dried stuff was observed to destroy 130_??_900μg of thiamine under the same experimental conditions as those in the previous report. The results obtained are summarized as follows. (1) Almost all the thiamine destructive factors of the mushrooms lost their activity when they were heated at 70°C for one hour, but in Xerocomus subtomentosus, a factor was detected, which was so stable as not to lose its activity even when it was heated at 100°C for one hour. (2) In the seven species of the mushrooms used in the experiment, such as Lactarius piperatus, Hygrocybe acutocanica and so on, a factor was detected, of which thiamine destruction activity was remarkably increased by adding aniline. (3) The extract of Laetiporus versiporus notably increased its destructive power of thiamine, when it was heated at 45°C for one hour. (4) At least, two or more different thiamine destructive factors were detected to exist together in several of the mushrooms.