The invention discloses a combined extraction method of different functional components in
citrus fruit peel residues. The method comprises the steps: adding water into the
citrus fruit peel residues, adjusting the pH value to be acidic, stirring and extracting at constant temperature, centrifuging extracted
pectin liquid, collecting supernate, carrying out
alcohol precipitation on the supernate, precipitating and
drying to obtain
pectin; adding water into the obtained residues, stirring, firstly, carrying out physical pretreatment, homogenizing, carrying out
alcohol precipitation, precipitating and
drying to obtain citrus fibers; and carrying out
alcohol recovery on the alcohol
precipitation waste liquid, and carrying out purification and concentration to obtain
limonin and
flavonoid substances. According to the invention, three functional products of
pectin,
limonin and
flavonoid extracts and citrus fibers applied in different fields are obtained through a continuous step-by-step separation and extraction process and a combined chemical and physical modification process, and through reasonable arrangement and planning of an industrialization
route, 'thorough eating and squeezing' is really realized. As a novel low-
pollution agricultural product biological environment-friendly
processing scheme, the combined extraction process
route has good conversion application expectation.