A Direct Sulfation Process of a Marine Polysaccharide in Ionic Liquid

Table 3

Molecular weight, (g/mol), the polydispersity index, and sulfur content, S (wt%) of GY785 DR and GY785 DRS obtained after sulfation with different sulfation agents.

Derivative	Sulfation agent	Mw (g/mol)	Ip	S^* (wt%)	S^** (wt%)
GY785 DR	—	7,500	1.1	3.4	3.0
GY785 DRS	SO3·Py	10,000	1.1	9.7	10.4
	SO3·DMF	9,000	1.3	11.7	10.5
	SO3·Me3N	9,000	1.2	7.5	10.7

Determined by the elemental analysis.
Determined by HPAEC method.