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Open AccessArticle

Agar Extraction By-Products from Gelidium sesquipedale as a Source of Glycerol-Galactosides

Laboratoire PEIRENE, Faculté des Sciences et Techniques, Université de Limoges, 123 Avenue Albert Thomas, 87060 Limoges CEDEX, France
SETEXAM Société d’ETudes et d’EXploitation des Algues et Produits Maritimes, km 7, Route de Tanger, Assam, BP 210, Kenitra 14000, Morocco
INRA-UR1268 BIA–Plate-forme BIBS, 3 Impasse Yvette Cauchois—La Géraudière–BP 71627—44316 Nantes CEDEX 3, France
Author to whom correspondence should be addressed.
Molecules 2018, 23(12), 3364;
Received: 22 November 2018 / Revised: 14 December 2018 / Accepted: 17 December 2018 / Published: 19 December 2018
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, 1H-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 α-d-galactopyranosyl-(1→3)-β-d-galactopyranosylα1-2–glycerol and α-d-galactopyranosyl-(1→4)-β-d-galactopyranosylα1-2–glycerol were described for the first time in red algae. View Full-Text
Keywords: Gelidium sesquipedale; seaweed; galactosylglycerol; floridoside derivatives; (Gal)2–4-glycerol Gelidium sesquipedale; seaweed; galactosylglycerol; floridoside derivatives; (Gal)2–4-glycerol
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Lebbar, S.; Fanuel, M.; Le Gall, S.; Falourd, X.; Ropartz, D.; Bressollier, P.; Gloaguen, V.; Faugeron-Girard, C. Agar Extraction By-Products from Gelidium sesquipedale as a Source of Glycerol-Galactosides. Molecules 2018, 23, 3364.

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