Figure 1.

FTIR spectrum of the polysaccharide extract of Trametes versicolor. FTIR assignments, wave number (cm⁻¹): 3000–3500 cm⁻¹ stretching vibration O–H and N–H; 2920–2950 cm⁻¹ C–H stretching vibration; 1630–1650 cm⁻¹ is characteristic of the absorbed water; 1200–1500 cm⁻¹ C–H deformation vibrations; 1030–1070 cm⁻¹ and 1150 cm⁻¹ stretching vibrations of glicosidic linkage (C–O–C) and C–O–H, respectively; 850 cm⁻¹ and 950 cm⁻¹ indicate the presence of α-glycoside bond; 890 cm⁻¹ indicates the presence of β-glycoside bond; 1630–1655 cm⁻¹ corresponds to the amide I band while the peak at about 1550 cm⁻¹ (1500–1600 cm⁻¹) refers to the amide II band. The presence of pigments is characterized with frequencies in the range (1600–1650 cm⁻¹) indicative for the aromatic C = C double bond conjugated with the C = O and/or –COO groups; the area of 1310–1410 cm⁻¹ is specific to OH groups of the phenolic compounds.