The invention provides a method for extracting
isochlorogenic acid from
plant processing by-products, and particularly belongs to the technical field of
plant by-product utilization. The method comprises the following steps: dissolving the
plant processing by-product by adopting a first short-chain
alcohol solvent to obtain a first
mixed solution; mixing the first
mixed solution with a non-polar organic extraction
solvent, and extracting to obtain an
alcohol-water phase; precipitating the
alcohol-water phase by adopting a
precipitation reagent to obtain an
isochlorogenic acid precipitate; dissolving the
isochlorogenic acid precipitate in a second short-chain alcohol
solvent, mixing with acid, carrying out double
decomposition reaction, and carrying out
solid-liquid separation to obtain a first filtrate; adjusting the pH value to 2-4, removing short-chain alcohol in the first filtrate, and carrying out
solid-liquid separation to obtain an isochlorogenic acid precipitate crude product; and dissolving the isochlorogenic acid precipitate crude product in a third short-chain alcohol solvent, and recrystallizing to obtain the isochlorogenic acid. The method provided by the invention can realize comprehensive utilization of plant
processing byproducts, and is simple in process, easy to operate and suitable for large-scale industrial production.