SUN Yuan-lin, CUI Wu-wei, GU Xiao-hong, TANG Jian, SHEN Rui-ling. Determination of Degree of Esterification in Pectic Polysaccharides from Angelica Sinensis (Oliv.) Diels by Fourier Transform InfraredSpectroscopy[J]. Spectroscopy and Spectral Analysis, 2009, 29(3): 682