WATER EXTRACTS FROM THE COMBINATION OF COCCINIA GRANDIS (L.) VOIGT LEAVES AND AVERRHOA BILIMBI L. FRUITS WITH ANTIDIABETIC PROPERTIES: AN IN VITRO STUDY

Objective: The combination of two or more plants in a product can improve the nature of the activity of the compounds contained and reduce toxicity. This study was aimed to make water extracts from the combination of Coccinia grandis (L.) CG Voigt and Averrhoa bilimbi L. (AB) with antidiabetic properties. Methods: The water extracts were made by decocting the combination of powdered CG Voigt leaves and AB fruits at various mass ratios (1:0, 1:3, 1:1, 3:1, and 0:1) and various amounts of powdered samples (1–5 g). The process was done in 100 ml of boiling water for 5 min. Results: The results showed that the highest total flavonoid content and total phenolic content of 135.1±0.18 mg quercetin equivalent micrograms d.m. and 48.5±3.09 mg gallic acid equivalent/g d.m., respectively, were found in the sample with a combination ratio of 1:3 (1 g). The antioxidant activity test using the 2,2-diphenyl-1-picrylhydrazyl method showed that the sample with a combination ratio of 3:1 had the lowest value of IC50 (4.447±0.446 mg/ml), which indicated the strongest radical scavenging activity, while the highest inhibition of α-amylase activity in the sample with a combination ratio of 1:1 amounted to 1.086±0.264 mg/ml. Conclusion: In general, all combinations of CG Voigt leaves and AB fruits had the potential as antidiabetic health beverages.