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Optimal conditions for extraction of bakkenolide B from Petasites japonicus leaves were determined by using response surface methodology. A second-order Box-Behnken design representing three extraction temperatures (80, 100, 120℃), three extraction times (30, 45, 60 min), and three solvent pH’s (5, 7, 9) was executed. The efficiency of the extraction conditions was defined using the β-hexosamidase assay by comparing both the bakkenolide B content and its anti-allergic activity expressed as extract inhibition on degranulation. The response surface plot described for the bakkenolide B content showed that the maximum content was predicted as 121.6 μg/g with extraction conditions of 127.1℃, 46.6 min, and pH 7.7. Extraction temperature and time were important factors in determining bakkenolide B content. Using regression analysis, correlation between the inhibition effect of mast cell degranulation and bakkenolide B content was found to be low.

Optimization of Extraction Conditions for Bakkenolide B from the Leaves of Petasites japonicus by Using Response Surface Methodology