Regulation of Laminaria Polysaccharides with Different Degrees of Sulfation during the Growth of Calcium Oxalate Crystals and their Protective Effects on Renal Epithelial Cells

Table 2

FT-IR characteristic absorption peaks of SLPs with different –OSO₃^- content.

SLPs	–OSO3^–content/%	Characteristic absorption peak/cm^-1
		O-H	-CH2-	C=O	C-O	–OSO3^–
						S=O	C-O-S
LP0	0.73	3385	2931	1640	1024	/	/
SLP1	8.58	3416	2932	1636	1024	1252	817
SLP2	15.1	3418	2932	1640	1022	1254	820
SLP3	22.8	3424	2953	1642	1007	1258	821.5
SLP4	31.3	3424	2957	1640	1008	1259	822