a b s t r a c t
Crude Acanthus ilicifolius (A. ilicifolius) polysaccharides (CAIP) were obtained by hot water extraction and
deproteinated. Two major polysaccharide fractions, the neutral A. ilicifolius polysaccharide (NAIP) and the
acid A. ilicifolius polysaccharide B (AAIP-B), were isolated from CAIP by chromatography using DEAESepharose
Fast Flow and Sepharose CL-6B. The molecular weights (Mw) of NAIP and AAIP-B, determined
by high performance gel-filtration chromatography (HPGFC), were 11,775 and 23,161 Da,
respectively. AAIP-B contained 51.23% uronic acid, characteristic of a pectin-type hetero-polysaccharide.
Analysis of the neutral monosaccharide composition indicated that NAIP contained high proportions of
arabinose, galactose and glucose. However, AAIP-B was mainly composed of rhamnose, arabinose and
galactose. Their structure properties were confirmed by FT-IR.
Both CAIP and AAIP-B had good free radical-scavenging capacities and reducing powers. AAIP-B was
the most effective antioxidant in CAIP. AAIP-B (0.2 mg/mL) could scavenge 80% of DPPH free radicals and
56.4% of superoxide anion radicals.
a b s t r a c tCrude Acanthus ilicifolius (A. ilicifolius) polysaccharides (CAIP) were obtained by hot water extraction anddeproteinated. Two major polysaccharide fractions, the neutral A. ilicifolius polysaccharide (NAIP) and theacid A. ilicifolius polysaccharide B (AAIP-B), were isolated from CAIP by chromatography using DEAESepharoseFast Flow and Sepharose CL-6B. The molecular weights (Mw) of NAIP and AAIP-B, determinedby high performance gel-filtration chromatography (HPGFC), were 11,775 and 23,161 Da,respectively. AAIP-B contained 51.23% uronic acid, characteristic of a pectin-type hetero-polysaccharide.Analysis of the neutral monosaccharide composition indicated that NAIP contained high proportions ofarabinose, galactose and glucose. However, AAIP-B was mainly composed of rhamnose, arabinose andgalactose. Their structure properties were confirmed by FT-IR.Both CAIP and AAIP-B had good free radical-scavenging capacities and reducing powers. AAIP-B wasthe most effective antioxidant in CAIP. AAIP-B (0.2 mg/mL) could scavenge 80% of DPPH free radicals and56.4% of superoxide anion radicals.
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