Figure 1.

Characterization of polysaccharides from Enteromorpha prolifera. (a) shows four peaks in the eluting curve, PEP-1, PEP-2, PEP-3, and PEP-4. The peak area of PEP-2 is the largest and contains 161 mg of polysaccharides. (b) shows the basic graph of PEP-2, which has a single, symmetrical elution peak. (c) shows the wavenumbers of 3386.02 cm⁻¹ as the stretching vibration of O–H, 2923.84 cm⁻¹, 2853.28 cm⁻¹, and 1454.36 cm⁻¹ as the vibration of –CH2–. The 1390.54 cm⁻¹ and 1232.13 cm⁻¹ symmetric stretching vibrations corresponded to two S=O groups of sulfate groups. Furthermore, 848.09 cm⁻¹ and 769.89 cm⁻¹ are the antisymmetric and symmetric stretching vibrations of the sulfate groups C–O and S–O. (d1) shows that the chromatogram of different standard monosaccharides. (d2) shows that PEP-2 is mainly composed of rhamnose, glucuronic acid, arabinose, fucose, xylose, and glucose.