The invention discloses a method for extracting low-methoxy
pectin from apple
pomace, comprises the following steps: washing apple
pomace by using water at 30-40 DEG.C,
microwave treating at 380-500 W and then filtering,
microwave drying, the filtered apple
pomace, stoving and crushing to obtain apple pomace
powder, mixing the apple pomac
powder and
acid water to perform
microwave treatment at 480-500 W, concentrating centrifuged supernatant as concentrated solution, pouring the concentrated solution in an upright filled with
active carbon, and collecting the filtrate; heating the filtrate to 5-10 DEG.C, adding alkali solution to regulate the pH value, adding the
acid water in the obtained
pectin concentration solution to regulate the pH value to 3-5, adding
ethanol water in the
pectin concentrated solution, mixing, standing and centrifuging to obtain the precipitate, washing by using the
ethanol water for 7-8 times, washing, precipitating, vacuum freezing and
drying to obtain a substance, namely, the low-methoxy pectin. The process is coherent and simple, the required
reagent is
reagent in common use, low in cost and easy to purchase; the extracting rate can achieve 7.9-9.4%, the esterfication degree is 38.7-41.4%, and the
galacturonic acid content is 72-82%.