Highly methylated agar from Gracilaria edulis (Gracilariales, Rhodophyta)

  title={Highly methylated agar from Gracilaria edulis (Gracilariales, Rhodophyta)},
  author={Ronald D. Villanueva and Nemesio E. Monta{\~n}o},
  journal={Journal of Applied Phycology},
The structure and gelling properties of alkali-modified agar from Gracilaria edulis were investigated. 1H and 13C NMR experiments revealed a basic repeating unit of alternating 3-linked 6- O-methyl-β-D-galactopyranose and 4-linked 3,6-anhydro-α-L-galactopyranose. Partial methylation at O-2 of the anhydrogalactose moiety was also revealed. Meanwhile, the O-4 of the methylated galactose residue was detected to exhibit partial sulfation by NMR and FT-IR spectroscopy. The gel strength and syneresis… CONTINUE READING