Platycodon grandiflorum(Jacq.)A.DC. as a traditional Chinese medicine was planted widely in China. In many countries, it was used for both medicinal materials and edibles. Pharmacological studies indicated that polysaccharides of Platycodon grandiflorum (PGP) had important activities of antitumor and imm-unoenhancement. So in this study, the auther conducted a systematic study on PGP, which were content determination, extraction, isolation, purification and structure analysis. Research methods and r...