Isolation,purification,and structural characterization of polysaccharide POP Ul b from Portulaca oleracea Characterization of Composite Film Prepared With Soy Protein Isolate and Methyl Jasmonate Structural characterization of Guiqi polysaccharides AAP-2A Structural characterization of C-glycosyl flavonoids in Scutellaria baicalensis and differentiation of isomers by UPLC/LTQ-Orbitrap-MS