Burdock root could be a source of inulin, but scarce studies about its extraction exist. To optimise conventional and ultrasound-assisted extraction of inulin, various combinations were used. The independent variables for ultrasound extraction were sonication amplitude (20–100%), sonication temperature (20–60 C) and sonication time (5–25 min) while for conventional extraction the following variables were water to solid ratio (5–15 v ⁄ w), temperature (40–90 C) and time (5–40 min). For each response, a second-order polynomial model was developed using multiple linear regression analysis. The use of high intensity ultrasound significantly improves the extraction of inulin contained within the body of Burdock root. It was shown that increasing the amplitude (from 20% to 85%) and extraction time increased the extraction yield; however, the effect of temperature was minor. Optimum extraction condition was found to be sonication time: 25 min, sonication amplitude 83.22% and temperature: 36.76 C.

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