We compared also the isoflavone content in tempeh depending on the soybean variety. Depending on the variety,
year of harvest, and method of boiling soybeans, slight differences in the isoflavone content were observed (9). The
typical contents of isoflavone in the yellow-soybean tempeh and black-soybean tempeh after 24 h fermentation are shown in Table 1. The contents of the three types of the aglycon in isoflavone in the yellow-soybean tempeh and black-soybean tempeh ranged from 16 to 17 mg, and those of the nine types of glucoside ranged from 86 to 87 mg. Thus, the total
isoflavone content was approximately 103 mg. On the basis of our present results, no essential difference in the isoflavone content in tempeh was observed between the two soy bean varieties, that is, the yellow-soybean and black-soybean