Figure 2
FT-IR spectra of raw seaweeds samples: (A) Chlorophyta, (B) Phaeophyta, (C) Rhodophyta. (a) C=C stretching (1650–1600 cm−1), (b) C–H bending; (1465–1450 cm−1), (c) N–O stretching (1550–1500 cm−1), (d) O–H bending; carboxylic acid (1440–1395 cm−1), (e) C–O stretching (1275–1200 cm−1), (f) S=O stretching (1070–1030 cm−1), (g) anomeric region (950–700 cm−1), (h) C–O–C bridge in 3,6-anhydro-l-galactose (930 cm−1). (G1) Ulva lactuca, (G2) Caulerpa racemosa, (G3) Halimeda opuntin, (G4) Caulerpa racemosa, (G5) Caulerpa sertularioides, (G6) Ulva lactuca, (G7) Chaetomorpha antennina, (G8) Chaetomorpha crassa, (B1) Padina antillarum, (B2) Sargassum illicifolium, (B3) Sargassum polycystem, (B4) Turbinaria ornata, (B5) Stoechospermum polypodioides, (B6) Sargassum illicifolium, (B7) Sargassum illicifolium, (B8) Padina antillarum, (B9) Sargassum illicifolium, (R1) Gracilaria corticata, (R2) Gracilaria corticata, (R3) Acanthophora spicifera, (R4) Gelidiopsis variabilis, (R5) Gracilaria corticata, (R6) Jania adhaereus.
