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Open AccessArticle

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

1
Laboratoire PEIRENE, Faculté des Sciences et Techniques, Université de Limoges, 123 Avenue Albert Thomas, 87060 Limoges CEDEX, France
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SETEXAM Société d’ETudes et d’EXploitation des Algues et Produits Maritimes, km 7, Route de Tanger, Assam, BP 210, Kenitra 14000, Morocco
3
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; https://doi.org/10.3390/molecules23123364
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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