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Figure S1. Effects of pH, extraction temperature and time on the yield and DPPH radical scavenging activity of polysaccharides. Different letters indicate significant difference, P < 0.05.

Figure S2. UV-visible spectra of polysaccharides from 200 to 400 nm. (a) polysaccharide extracted by citric acid and hot water (LJPA) and (b) polysaccharide extracted by hot water (LJPW).

Figure S3. Rheological properties of polysaccharides extracted by citric acid (LJPA) and hot water (LJPW).

Figure S4. The molecular weight distribution of polysaccharides extracted by citric acid (LJPA) and hot water (LJPW).

Figure S5. The monosaccharide composition of polysaccharides. (a) standard; (b) citric acid-extracted polysaccharide (LJPA); (c) hot water-extracted polysaccharide (LJPW).

Figure S6. Antioxidant capacity of polysaccharides extracted by citric acid (LJPA) and hot water (LJPW). (a) oxygen radical absorbance capacity; (b) ABTS radical scavenging activity; (c) reducing power.

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