mannuronic acid

man·nu·ron·ic ac·id

(man'yū-ron'ik as'id),
Uronic acid derived from the oxidation of mannose; a component of alginic acid.
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The second stage appears in the range between 231 and 283[degrees]C which could be assigned to degradation of PMA chain [31] and may be also due to breaking of segments of mannuronic acid and glucuronic acid of alginate [32].
Chemically, alginic acid is a block copolymer of anhydro [beta]-D mannuronic acid and anhydro [alpha]-D glucouronic acid.
Alginates are, in fact, polymers of two uronic acids--guluronic acid (G) and mannuronic acid (M)--grouped into homopolymeric segments of guluronic (G blocks) and mannuronic acid (M blocks), respectively, and a block of alternating residues (MG blocks).
1] are characteristic for polysaccharide structure, and they confirm the presence of guluronic and mannuronic acid units [16].
Alginate derived from brown sea algae is a random anionic linear polymer consisting of varying ratios of [beta]-L guluronic acid (G) and [alpha]-D mannuronic acid (M) units (4).
The cations ionically interact with -COO- groups of guluronic acid and mannuronic acid residues to form the cross links.