Structural features and antioxidant activities of polysaccharides from different parts of Codonopsis pilosula var. modesta (Nannf.) L. T. Shen oleh Li-Xia Li, Li-Xia Li, Meng-Si Chen, Zi-Yu Zhang, Berit Smestad Paulsen, Frode Rise, Chao Huang, Bin Feng, Xing-Fu Chen, Ren-Yong Jia, Chun-Bang Ding, Shi-Ling Feng, Yang-Ping Li, Yu-Long Chen, Zhen Huang, Xing-Hong Zhao, Zhong-Qiong Yin, Yuan-Feng Zou