Identification of True and False Astragalus Polysaccharides (Astragalus Extract) 1. Appearance detection method 1.1. Look: those with lower polysaccharide content (30-50%) are pale yellow powders, which are hygroscopic. Those with polysaccharide content above 70% are white powder or off-white powder. If the color is too dark, a large amount of other sugars and pigments may be [...]