To provide a method for removing a residual agricultural chemical of a plant extract by using carbon dioxide fluid kept in a supercritical or subcritical state, in which the residual agricultural chemical can efficiently be removed without loss or deterioration of a plant extract ingredient.
The method for removing the residual agricultural chemical of the plant extract comprises a carbon dioxide-dissolving step for dissolving carbon dioxide in the plant extract material by bringing the plant extract material into contact with the carbon dioxide fluid, a carbon dioxide supercritical treatment step for retaining the plant extract material in which the carbon dioxide is dissolved in the supercritical or subcritical state and agitating the solution, and a carbon dioxide-removing step for removing carbon dioxide from the plant extract material by rapidly reducing the pressure of the plant extract material to ordinary pressure. In the carbon dioxide-dissolving step, an aspect using the carbon dioxide fluid forming microbubble by passing the carbon dioxide fluid through a mesh-like filter having ≤100 μm mesh is preferable.
KUWABARA HIROMOTO
KAJIYA TETSUHIRO
| JP2000072790A | 2000-03-07 |
| WO2004016277A2 | 2004-02-26 |
Yoshihiro Nagare
Naoko Matsuda