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The abnormal folding and aggregation of amyloid-β protein (Aβ) is the main reason for the occurrence and development of Alzheimer's disease (AD). The discovery of novel inhibitors against Aβ aggregation is still the current research focus. Herein, we report the inhibitory effect of ulvan, an acidic polysaccharide from green algae of the genus Ulva, against Aβ fibrillation using thioflavin T (ThT) fluorescence and atomic force microscopy (AFM) assays. It is shown that ulvan effectively inhibits Aβ fibrillogenesis in a concentration-depend