On the other hand, alpha-glucosidase enzymes are crucial for breaking down carbohydrates into glucose in the human digestive system. Therefore, inhibitors are required to act as antidiabetic drugs by blocking these enzymes. Acarbose, an alpha-glucosidase inhibitor, is used to treat patients with high blood glucose levels. However, most synthetic antidiabetic drugs have been associated with side effects like flatulence, diarrhea, and abdominal discomfort. 7 Extensive attempts have been made to discover Alpha-glucosidase Inhibitors (AGI) from natural sources for diabetes treatment. 8 Prior studies demonstrated the antidiabetic properties of Lontar fruit fiber extract. The methanol extract of B. flabellifer fruit was tested on diabetic rats induced with oral doses of high-fat diets/streptozotocin for 21 days and exhibited a decrease in fasting blood glucose, triglycerides, total cholesterol, free unsaturated fat, fructose 1,6 bisphosphatase, and glucose-6-phosphate compared to diabetic control. 9 The flower and root of B. flabellifer also showed potential antidiabetic effects when tested on diabetic rats induced with streptozotocin and alloxan. 10 Combining AGI and antioxidants will be more effective in preventing type 2 diabetes. 11,12 Secondary metabolites are recognized as the substances responsible for the biological impacts of plants. 8,13 The phytochemical screening of B. flabellifer fruit fiber extract revealed the presence of saponins, flavonoids, tannins, alkaloids, steroids, terpenoids, and glycosides. 4,14 Phenols and flavonoids have been found to inhibit the alphaglucosidase and have antioxidant activity. 15 Various studies have demonstrated that the extraction methods and choice of solvent impact the total phenol and flavonoid content and the activity of these compounds. [16][17][18] Recently, some studies have investigated the effect of different collection areas, solvents, and parts of B. flabellifer on antioxidant, antibacterial, and antidiabetic activity. 5,19,20,21 However, no studies have