CAS: 183668-72-6

L-Pentaguluronic acid, a linear polysaccharide copolymer, consists predominantly of four units of L-guluronic acid (G).

Penta-guluronic acid sodium salt (1,4-linked α-L-sodium guluronopentaose) is one of a number of oligosaccharides obtained from alginate which is a polysaccharide in brown seaweeds containing: blocks of repeating mannuronic acid sequences (M-M-M-M etc), repeating guluronic acid sequences (G-G-G-G etc), and alternating M-G-M-G sequences. This oligosaccharide can be released by acid hydrolysis (Shimokawa, 1996) and a number of biological activities have been discussed in a recent review (Xing, 2020).