Scutellaria属植物の成分研究(第7報) : コガネバナの根の生長とフラボノイド含量の季節変化

概要

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A fundamental study of the cultivation of Scutellaria baicalensis was conducted, in order to establish the relationship between the growth of the root and the flavonoid content. The main flavonoids-baicalin, baicalein, wogonin, wogonin 7-0-glucuronide, oroxylin A and oroxylin A 7-O-glucuronide, were periodically determined over a period of three years by high-performance liquid chromatography. 1. The dry weight of the root gradually increased during the three years, though it decreased during the resting periods. 2. The flavonoids steadily accumulated in the root except during rest. 3. In the root of 2- and 3-year-old plants, dry matter productions significantly decreased before and after budding. During budding, some flavone glucuronides were hydrolysed to form their aglycones and then the glycosidation accelerated throughout the flowering and fruit bearing periods. 4. In the root of 2-year-old plants the baicalin content (main component) was highest in the latter half of the fruit bearing time, and was almost the same as in the root of 3-year-old plant. 5. In 3-year-old plant, ca. 40% of the roots were decayed after the fruit bearing time. It is, therefore, considered that, from the viewpoint of both yield and quality, the root of Scutellaria baicalensis should be harvested in the second year in the latter half of the fruit bearing time (in late autumn).
日本生薬学会の論文
1986-12-20