Table 2.

FT-IR characteristic absorption peaks of GLP.

Sample	Molecular weight Mr (kDa)	Content of −OSO3H (%)	Content of −COOH (%)	Characteristic absorption peak (cm−1)
				−OH	−COOH	−OSO3	Sugar ring
GLP0	622 ± 35	13.07	1.26	3432	1643	1380, 1257	2928, 1048
GLP2	49.6 ± 4.8	13.41	1.28	3421	1604	1380, 1263	2928, 1053
GLP3	10.5 ± 3.9	13.46	1.30	3408	1604	1380, 1258	2920, 1043
GLP7	2.42 ± 0.16	13.56	1.77	3409	1609	1380, 1268	2920, 1043