The wavenumbers (frequency) between 1780-1620 cm-1 indicated the presence carboxyl group (COOH)
(Koay 2011 [11]; UI-Islam 2013 [13]). At the frequency of 1273 cm-1 indicated the presence of functional groups CO
(ester) and at 1134 cm-1 indicated COC functional groups while at 1057 cm-1 was the functional group of polymer
backbone chains C-C of GAG (Rockwell 2014) [17]. The peak at 1134 cm-1 and 1057 cm-1 indicated the presence of
galactans and arabinogalactan (Kacurakova 2000) [18] and was also suspected as a pyranose ring, while the peak at 849
cm-1 wave as an indication of the presence of mannose (Wang et al. 2014) [15].