A novel substance exhibiting physiologically active effects is produced from a tea leaf. A novel polyphenol derivative is produced, for example, by subjecting a microbially fermented tea leaf obtained by culturing
Aspergillus
sp. (PK-1) with a tea leaf, to an extraction treatment.
一种从茶叶中提取出具有生理活性作用的新物质。例如,通过将培养产生Aspergillus sp.(PK-1)的微
生物发酵茶叶与茶叶进行提取处理,可以产生一种新的多
酚衍
生物。