Coix (Coix lachryma-jobi L.), commonly known as adlay, is a traditional Chinese medicine for thousands of years. A new water-soluble polysaccharide with anti-diabetic activity was extracted and purified from the adlay seed (PAS). The structure and physicochemical properties of PAS were determined by Fourier transform infrared spectrometer (FT-IR) and scanning electron microscopy (SEM). Structural analysis indicated that PAS had a porous surface and relatively loose distribution. After intragastric administered PAS for 4 weeks, biochemical analysis demonstrated dose dependent anti-diabetic activity. These results showed that PAS decreased blood glucose and insulin levels. In addition, mice fed the PAS showed significantly reduced the plasma levels of amyloid β and glycated hemoglobin (HbA1c), while the expression of glucagon-like peptide-1 (GLP-1) was markedly increased. Our study introduced a new polysaccharide PAS with unique anti-diabetic activity, which can be used as a potential dietary supplement or functional food.
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