Galactan

Galactan
Names
	Other names D-Galactan; Galactosan
Identifiers
CAS Number	9037-55-2;
ChEBI	CHEBI:37165;
KEGG	C05796;
Properties
Chemical formula	(C6H10O5)n
Molar mass	Variable
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Galactan (galactosan) is a polysaccharide consisting of polymerized galactose.^[1] In general, galactans in natural sources contain a core of galactose units connected by α(1→3) or α(1→6), with structures containing other monosaccharides as side-chains.^[2]

Galactan derived from Anogeissus latifolia is primarily α(1→6), but galactan from acacia trees is primarily α(1→3).^[3]

Halymenia durvillei is a red seaweed (algae) that produces a sulfated galactan.^[4] Several other algae species also contain galactans.^[5] Including Carpopeltis F.Schmitz, 1895.^[6]

Galactan is found in the side chains of rhamnogalacturonan I (RG-I) and is needed for gel formation in the cell walls of organisms.^[7] It was observed there was less of the gelling characteristic (as well as the polymeric chains being more likely to degrade) when fewer galactans were present in the polymeric side chains. ^[7]^[8]

References[edit]

^ Galactans at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
^ Zanetti, Maurizio; Capra, Donald J. (2003-09-02). The Antibodies. CRC Press. p. 78. ISBN 9780203216514.
^ Zanetti, Maurizio (1995). The antibodies. Luxembourg: Harwood Academic Publishers. p. 78. ISBN 0-415-28466-X.
^ Fenoradosoa, T. A.; Delattre, C.; Laroche, C.; Wadouachi, A.; Dulong, V.; Picton, L.; Andriamadio, P.; Michaud, P. (1 August 2009). "Highly sulphated galactan from Halymenia durvillei (Halymeniales, Rhodophyta), a red seaweed of Madagascar marine coasts". Int J Biol Macromol. 45 (2): 140–5. doi:10.1016/j.ijbiomac.2009.04.015.
^ Advances in Carbohydrate Chemistry and Biochemistry Vol. 65 (2011), p. 168, at Google Books
^ I.J. Miller and J. Mollion, Evaluation of the structures of galactans from Carpopeltis sp. a member of the Halymeniales in the western Indian Ocean, Bot. Mar., 49 (2006) 79-85
^ ^a ^b Mikshina, Polina V.; Makshakova, Olga N.; Petrova, Anna A.; Gaifullina, Ilzira Z.; Idiyatullin, Bulat Z.; Gorshkova, Tatyana A.; Zuev, Yuriy F. (September 2017). "Gelation of rhamnogalacturonan I is based on galactan side chain interaction and does not involve chemical modifications". Carbohydrate Polymers. 171: 143–151. doi:10.1016/j.carbpol.2017.05.013.
^ Robal, Marju; Truus, Kalle; Volobujeva, Olga; Mellikov, Enn; Tuvikene, Rando (November 2017). "Thermal stability of red algal galactans: Effect of molecular structure and counterions". International Journal of Biological Macromolecules. 104: 213–223. doi:10.1016/j.ijbiomac.2017.05.175. ISSN 0141-8130.

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[1] Galactans at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

[2] Zanetti, Maurizio; Capra, Donald J. (2003-09-02). The Antibodies. CRC Press. p. 78. ISBN 9780203216514.

[3] Zanetti, Maurizio (1995). The antibodies. Luxembourg: Harwood Academic Publishers. p. 78. ISBN 0-415-28466-X.

[4] Fenoradosoa, T. A.; Delattre, C.; Laroche, C.; Wadouachi, A.; Dulong, V.; Picton, L.; Andriamadio, P.; Michaud, P. (1 August 2009). "Highly sulphated galactan from Halymenia durvillei (Halymeniales, Rhodophyta), a red seaweed of Madagascar marine coasts". Int J Biol Macromol. 45 (2): 140–5. doi:10.1016/j.ijbiomac.2009.04.015.

[5] Advances in Carbohydrate Chemistry and Biochemistry Vol. 65 (2011), p. 168, at Google Books

[6] I.J. Miller and J. Mollion, Evaluation of the structures of galactans from Carpopeltis sp. a member of the Halymeniales in the western Indian Ocean, Bot. Mar., 49 (2006) 79-85

[:0-7] Mikshina, Polina V.; Makshakova, Olga N.; Petrova, Anna A.; Gaifullina, Ilzira Z.; Idiyatullin, Bulat Z.; Gorshkova, Tatyana A.; Zuev, Yuriy F. (September 2017). "Gelation of rhamnogalacturonan I is based on galactan side chain interaction and does not involve chemical modifications". Carbohydrate Polymers. 171: 143–151. doi:10.1016/j.carbpol.2017.05.013.

[8] Robal, Marju; Truus, Kalle; Volobujeva, Olga; Mellikov, Enn; Tuvikene, Rando (November 2017). "Thermal stability of red algal galactans: Effect of molecular structure and counterions". International Journal of Biological Macromolecules. 104: 213–223. doi:10.1016/j.ijbiomac.2017.05.175. ISSN 0141-8130.

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