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Pouteria torta epicarp as a useful source of α-amylase inhibitor in the control of type 2 diabetes.

Type 2 diabetes plays a major role in public health, affecting about 400 million adults. One of the used strategies to control type 2 diabetes is the inhibition of α-amylase activity to reduce post-prandial blood glucose levels. Therefore, in past decades, the search of new α-amylase inhibitors has led to the evaluation of natural products as a source of these compounds. Pouteria torta (Sapotaceae) is widespread in Brazil and bears edible fruits. Epicarp and pulp crude extracts of fresh fruits were studied for in vitro α-amylase inhibition activity. The pulp did not present activity while epicarp, usually considered as waste, showed a high α-amylase inhibitory capacity when compared with acarbose and Triticum aestivum. Therefore, an assay-guided fractionation study of epicarp crude extract was performed. Fraction VI shows very high inhibitory activity with IC50 of 9 μg/mL. However, subsequent fractionation led to lower inhibition potential (IC50 of 22.1 μg/mL). The qualitative characterization of fraction VI were performed by chromatographic and spectrometric analysis and showed the presence of epicatechin, catechin, sucrose, glucose, and fructose. Total phenolic and flavonoid contents and antioxidant capacity were also assessed and there seemed to be no correlation between phenolic or flavonoids-rich fractions and antioxidant capacity or α-amylase inhibitory activity.

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