NMR spectrometry H and C NMR spectra were obtained with an NMR spectrom-eter (AVANCE III 500, Bruker, Germany) at 35◦. A 30 mg sampleof polysaccharides was dissolved in2H2O and lyophilized threetimes. The deuterium-exchanged polysaccharide sample, dissolvedin2H2O again was detected using dimethyl silicon pentane sodiumsulfonate as an internal standard.