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The molecule laminarin (also known as laminaran) is a storage glucan (a polysaccharide of glucose) found in brown algae [1]. These energy reserve polysaccharides are present in reserve vacuoles inside the macroalgal cell and may constitute up to 35% of the dried weight of the macroalgal biomass.[1]

Chemically laminarin is described as 1,3-linked β-d-glucose residues with different degrees of branching at β-(1,6) that influences the water solubility of the molecules,[1] this chemical structure may vary in its degree of branching and polymerization and in the ratio of (1,3)- and (1,6)-glycosidic bonds.[1]

It is used as a carbohydrate food reserve in the same way that chrysolaminarin is used by phytoplankton, especially in diatoms,[2] it is created by photosynthesis and is made up of β(1→3)-glucan with β(1→6)-branches. It is a linear polysaccharide, with a β(1→3):β(1→6) ratio of 3:1,[3] its hydrolysis is catalyzed by enzymes such as laminarinase (EC that breaks the β(1→3) bonds.[4]


  1. ^ a b c d "Polysaccharides from macroalgae: Recent advances, innovative technologies and challenges in extraction and purification". Food Research International. 99: 1011–1020. 2017-09-01. doi:10.1016/j.foodres.2016.11.016. ISSN 0963-9969. 
  2. ^ Beattie A, Hirst EL, Percival E (June 1961). "Studies on the metabolism of the Chrysophyceae". Biochem. J. England. 79: 531–537. PMC 1205682Freely accessible. PMID 13688276. 
  3. ^ Nisizawa K, Yamaguchi T, Handa N, Maeda M, Yamazaki H (November 1963). "Chemical nature of a uronic acid-containing polysaccharide in the peritrophic membrane of the silkworm". Journal of Biochemistry. Japan: Oxford University Press for Japanese Biochemical Society. 54: 419–426. ISSN 0021-924X. PMID 14089735. 
  4. ^ Salyers AA, Palmer JK, Wilkins TD (May 1977). "Laminarinase (beta-glucanase) activity in Bacteroides from the human colon". Appl Environ Microbiol. England. 33 (5): 1118–1124. PMC 170836Freely accessible. PMID 879772.