RESUMO
Two novel polysaccharides were obtained from flowers of Apocynum venetum L., and named as Vp2a-II and Vp3. Their average molecular weights were 7â¯kDa and 9â¯kDa, respectively. Methods of monosaccharide analysis, acid hydrolysis and methylation analysis, Fourier transform-infrared spectroscopy (FT-IR), gas chromatography-mass spectrometry (GC-MS) and nuclear magnetic resonance (NMR) spectroscopy were used to identify the structure of Vp2a-II and Vp3. Vp2a-II was composed of â6)-ß-d-Glcp-(1â¯ââ¯6)-α-d-Galp-(1â residues. Vp3 was composed of α-d-GlcpA-(3â¯ââ¯α-d-GalpA residues. The anticoagulant activity was evaluated by activated partial thromboplastin time (APTT), thrombin time (TT), prothrombin time (PT), and fibrinogen (FIB) assays in vitro. Results indicated that Vp3 exhibited the anticoagulant activity.