In vitro antioxidant and antitumor activities of polysaccharides extracted from Asparagus officinalis

► Asparagus polysaccharide showed remarkable antioxidant and antitumor activities. ► AOP-4 with Mw 5.75 × 104 Da showed significant scavenging hydroxyl radical. ► Three AOP fractions had significant antitumor activity in a dose dependent manner.