Bioassay-guided isolation of α-glucosidase inhibitors from Byrsonima garcibarrigae Cuatrec

• Published in: Revista colombiana de ciencias químico-farmacéuticas Vol. 51; no. 3
• Main Authors: Tallita Marques Machado, Carolina Queiroz Valentim, Leonard Domingo Rosales Acho, Emerson Silva Lima, Hector Henrique Ferreira Koolen, Guilhon-Simplicio, Fernanda
• Format: Journal Article
• Language: English
• Published: Bogota Universidad Nacional de Colombia 2022
• Subjects: Antidiabetics; Antioxidants; Bark; Chloroform; Composting; Ethyl acetate; Fractionation; Glucosidase; Hexanes; NMR; Nuclear magnetic resonance; Oxidative stress; Phenols; Stems
• ISSN: 0034-7418; 1909-6356
• DOI: 10.15446/rcciquifa.v51n3.96982

Introduction: Byrsonima garcibarrigae is an endemic tree of Amazonas state, Brazil, with pharmacological and chemical knowledge poorly understood. Aim: To investigate the antidiabetic potential of the B. garcibarrigae stem bark. Methods: The stem bark was sequentially extracted by maceration with hexane (EHBG), ethyl acetate (EABG), and methanol (EMBG). The antioxidant capacity, α-glucosidase inhibitory potentials and anti-glycation capacities were evaluated. A bio-guided fractionation gave compounds that were characterized by MS and NMR. Results: 8 compounds were identified by HPLC-MS. EMBG showed the highest α-glucosidase inhibitory activity (1.09±0.32 μg/mL), antioxidant activity (9.2±0.23 μg/mL) and phenolic compounds content (61.43±0.50%), thus was fractionated producing hexane (FHX), chloroform (FCL) and hydromethanolic (FHM) fractions. After additional anti-α-glucosidase assays, FHM (1.02±0.49 μg/mL) was fractionated giving quercitrin and epicatechin. The anti-glycation assay showed that EMBG, FHM and quercitrin presented higher activities in comparison to the positive control, aminoguanidine. Conclusions: B. garcibarrigae displayed antidiabetic potential since inhibited α-glucosidase, as well as presented expressive antioxidant and anti-glycation activities were recorded.