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Porphyran

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Porphyran is a sulfated carbohydrate dervied from red algae of the genus Porphyra.[1]

Composition

Porphyran is a complex sulphated carbohydrate. It is a highly substituted agarose with a linear backbone consisting of 3-linked beta-D-galactosyl units alternating with either 4-linked alpha-L-galactosyl 6-sulfate or 3,6-anhydro-alpha-L-galactosyl units. The composition includes 6-O-sulphated L-galactose, 6-O-methylated D-galactose, L-galactose, 3,6-anhydro-L-galactose, 6-O-methyl D-galactose and ester sulphate. Some of the ester is present as 1-4-linked L-galactose 6-sulphate.[1][2][3][4] The precise composition of porphyran shows seasonal and environmental variations.[1] In Porphyra haitanensis, the L-residues are mainly composed of alpha-L-galactosyl 6-sulphate units, and the 3,6-anhydro-galactosyl units are minor.[3] In Porphyra capensis, The ratio of alpha-L-galactose-6-sulphate and the 3,6-anhydrogalactose is 1.2:1.[4]

References

  1. ^ a b c Rees DA, Conway E (1962). "The structure and biosynthesis of porphyran: a comparison of some samples". Biochem. J. 84: 411–6. PMC 1243684. PMID 14490986. {{cite journal}}: Unknown parameter |month= ignored (help)
  2. ^ Peat S, Turvey JR, Rees DA (1961). "Carbohydrates of the red alga, Porphyra umbilicalis". J. Chem. Soc.: 1590–5. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
  3. ^ a b Zhang Q, Li N, Liu X, Zhao Z, Li Z, Xu Z (2004). "The structure of a sulfated galactan from Porphyra haitanensis and its in vivo antioxidant activity". Carbohydr. Res. 339 (1): 105–11. PMID 14659676. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
  4. ^ a b Zhang Q, Qi H, Zhao T; et al. (2005). "Chemical characteristics of a polysaccharide from Porphyra capensis (Rhodophyta)". Carbohydr. Res. 340 (15): 2447–50. doi:10.1016/j.carres.2005.08.009. PMID 16150429. {{cite journal}}: Explicit use of et al. in: |author= (help); Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
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