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Abstract: YADA and her co-workers have recently reported that the high content of formaldehyde was recognized in Shii-ta-ke mushroom, Lentinus edodes. They pointed out that, formaldehyde content in fresh Shii-ta-ke was 8 to 24 ppm and in dried ones 100 to 230 ppm, respectively. The formaldehyde content was constant during the growing. However, after harvest formaldehyde increased 3 to 4 times during the drying process. These values are remarkably high compared with other edible fungi. On the other hand, YASUMOTO and his co-workers concluded that most of formaldehyde were formed by quantitative analysis procedure via acidic decomposition of the precursor such as lentinic acid and that the original content of formaldehyde was less than 40 ppm. Thus, no definite information has been available on the cause of formaldehyde formation in Shii-ta-ke. An attempt has been made in the present study to investigate the mechanism of the formation of formaldehyde in Shii-ta-ke.
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