Abstract
α-amylase (α-1,4-glucan-4-glucohydrolase, EC 3.2.1.1) is an enzyme that catalyzes the degradation of starch into its monomers. Most people use medicinal plants for keeping normal level of blood glucose, for example, the Annona muricata. The objectives of this study are to obtain endophytic bacteria from the plant, knowing the activity of the α-amylase inhibitor of selected isolates. Endophytic bacteria are isolated from the roots, stems, and leaves of the plant have been sterilized surface and grown in NA medium. A total of 11 isolates were found to produce α-amylase inhibitor compounds. The isolates obtained were tested for their α-amylase inhibitor activity, and isolates with the highest activity tested further. Isolate DS21 show the best activity with 72,22% inhibition. The experimental design used in this research is Completely Randomized Design (RAL). The best isolates treated by a variety of carbon sources, and the best carbon source treated with various pH. The data obtained were analyzed usingAnalysis of Variance (ANOVA). The results of statistical tests show the treatment of starch and lactose has a significant effect on the production of α-amylase inhibitors (P <0.05) and the pH 5 and 6,0 significantly affected the production of α-amylase inhibitors (P <0.05).
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