Structural Characterization, Antioxidant Activity, and Biomedical Application of Astragalus Polysaccharide Degradation Products

Table 3

Structure characterization of APS1 and APS2 by ¹³C NMR spectra.

	Composition	Chemical shifts (δppm)
		C-1	C-2	C-3	C-4	C-5	C-6
APS1	β-D-Glcp	103.6
	(1 → 4)-α-D-Glcp	99.6	71.5	73.3	76.7	71.1	60.4
	(1 → 4)-GalA	100.1	72.6	72.4	81.3	73.3
	(1 → 6)-α-D-Glcp		71.8	73.0	69.3	70.4	65.7
	(1→)-α-D-Rha	92.2	72.3	70.1	83.7	69.0
	(1 → 6)-α-D-Gal				70.5	72.4	63.6
APS2	β-D-Glcp	103.7
	(1 → 4)-α-D-Glcp	99.6	71.5	73.2	76.7	71.2	60.4
	(1 → 4)-GalA	100.2	72.7	72.3	81.2	73.3
	(1 → 6)-α-D-Glcp		71.9	73.1	69.3	70.4	65.6
	(1→)-α-D-Rha	92.1	72.2	70.1	83.7	69.0
	(1 → 6)-α-D-Gal				70.5	72.4	63.7

Gal: galactose; Glcp: glucose; Rha: rhamnose; GalA: glucuronic acid.