Abstract\nBackground: Chronic hyperglycemia enhances the formation of advanced glycation endproducts (AGEs) and\nreactive oxygen species (ROS), contributing to diabetic complications. Thus, controlling blood glucose levels,\ninhibiting the formation of AGEs and reducing ROS are key therapeutic targets in early stage type 2 diabetes.\nMethods: The inhibitory effects of seven commercial liquid nutritional supplements against carbohydrate\nhydrolysing enzymes, Ã?±-amylase and Ã?±-glucosidase, was determined by dinitrosalicylic (DNS) reagent and\np-nitrophenyl-Ã?±-D-glucopyranoside solution, respectively. Antiglycation activity was determined using the\nformation of fluorescent protein-bound AGEs. Total phenolic and flavonoid content and antioxidant properties\n(1,1-diphenyl-2-picrylhydrazyl antioxidant activity (DPPH) and ferric reducing antioxidant power (FRAP)) were\ndetermined for correlation among these components and inhibitory activities.\nResults: Samoan noni juice showed the greatest inhibitory effects against Ã?±-amylase, whereas chlorophyll\nextracts showed the greatest inhibitory effect against Ã?±-glucosidase. Inhibition of Ã?±-glucosidase correlated\nwith TFC (r2 = 0.766; p < 0.01) and FRAP (r2 = 0.750; p < 0.01) whereas no correlation was observed for Ã?±-amylase\ninhibition. All supplements inhibited fluorescent protein-bound AGEs, with the greatest effect exerted by Olive\nLeaf Extract, Blood Sugar Support (IC50 = 0.5 mg/ml). The IC50 values negatively correlated with TPC (r2 = âË?â??0.707;\np < 0.001) and DPPH scavenging activities (r2 = 0.515; p < 0.05).\nConclusion: The findings of this study highlight the potential of liquid nutritional supplements in managing and\ntreating type 2 diabetes mellitus.
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