Abstract
We extracted rutin from the aerial parts of common buckwheat using subcritical water (SW) in a semi-continuous mode. The effects of temperature (80 °C, 100 °C and 120 °C) and flow rate (1 mL/min, 2 mL/min and 3 mL/min) on the extraction yields were investigated. The extraction yield of rutin increased as the temperature and flow rate rose. The highest yield was 91.0% at 120 °C and 3 mL/min. The rutin yields at 120 °C were 14.5, 9.6 and 6.7 times higher at 1 mL/min, 2 mL/min and 3 mL/min, respectively than at room temperature. Four kinetic models were fitted to the experimental extraction curves. The two-site kinetic desorption model agreed well with the experimental data under all extraction conditions and best described the rutin extraction mechanism. This study confirmed the potential applicability of SW to the extraction of valuable rutin from the aerial parts of buckwheat.
Published Version
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