Alpha-glucosidase inhibitory activity and lipid-lowering mechanisms of Moringa oleifera leaf extract.

Researchers investigated whether Moringa oleifera leaf extract could help manage blood sugar and cholesterol levels through laboratory testing of specific enzyme activities. The study examined how the extract affects alpha-glucosidase and alpha-amylase (enzymes that break down carbohydrates), as well as several mechanisms involved in fat and cholesterol processing. The extract showed strong inhibition of sucrase, an intestinal enzyme that breaks down sugar, with an IC50 value of 0.78 mg/ml, meaning this concentration reduced enzyme activity by half. The extract also demonstrated significant bile acid binding capacity, capturing over 20% of three different bile acids tested, and reduced cholesterol micelle formation by approximately 40% at higher concentrations. However, the extract had minimal effects on pancreatic alpha-amylase and cholesterol esterase, and showed no activity against pancreatic lipase. The phytochemical analysis revealed substantial levels of bioactive compounds: 45.21 mg gallic acid equivalents per gram for total phenolics, 15.39 mg catechin equivalents per gram for flavonoids, and 4.90 mg catechin equivalents per gram for condensed tannins. These findings suggest that moringa leaf extract may offer multiple pathways for supporting healthy blood sugar and lipid levels, primarily through inhibiting sugar absorption in the intestines and interfering with cholesterol processing mechanisms.