Journal
MOLECULES
Volume 23, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/molecules23123364
Keywords
Gelidium sesquipedale; seaweed; galactosylglycerol; floridoside derivatives; (Gal)(2-4)-glycerol
Funding
- SETEXAM (Kenitra, Morocco)
- BIBS platform of Nantes [ANR-11-INBS-0012]
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Alkaline treatment is a common step largely used in the industrial extraction of agar, a phycocolloid obtained from red algae such as Gelidium sesquipedale. The subsequent residue constitutes a poorly valorized by-product. The present study aimed to identify low-molecular-weight compounds in this alkaline waste. A fractionation process was designed in order to obtain the oligosaccharidic fraction from which several glycerol-galactosides were isolated. A combination of electrospray ion (ESI)-mass spectrometry, H-1-NMR spectroscopy, and glycosidic linkage analyses by GC-MS allowed the identification of floridoside, corresponding to Gal-glycerol, along with oligogalactosides, i.e., (Gal)(2-4)-glycerol, among which -d-galactopyranosyl-(13)--d-galactopyranosyl1-2-glycerol and -d-galactopyranosyl-(14)--d-galactopyranosyl1-2-glycerol were described for the first time in red algae.
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