4.6 Article

qNMR quantification of phenolic compounds in dry extract of Myrcia multiflora leaves and its antioxidant, anti-AGE, and enzymatic inhibition activities

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ELSEVIER
DOI: 10.1016/j.jpba.2021.114109

Keywords

Myrcia sphaerocarpa; Ellagitannin; Flavonoid; Enzymatic inhibition; PULCON; ESI-HRMS

Funding

  1. Coordenacao de Aperfeicoamentode Pessoal de Nivel Superior -CAPES (Pro-Amazonia) [3256/2013]
  2. Financiadora de Estudos de Projetos e ProgramasFINEP
  3. Fundacao de Amparo a Pesquisa do Estado do Amazonas FAPEAM [062.00917/2015, 005/2019]
  4. Analytical Center at UFAM
  5. UFPR

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The extract from Myrcia multiflora leaves contains a variety of phenolic compounds with antidiabetic, antioxidant activities, and no cytotoxicity. These compounds can be used as chemical markers in this matrix.
Myrcia multiflora (Lam.) DC. is often used in Brazilian folk medicine to control diabetes. Analysis using HPLC-HRMS and NMR of the dry extract from the infusion of leaves of this species revealed twelve phenolic compounds. Among these compounds, chlorogenic acid (1), 4-O-caffeoylquinic acid (2), corilagin(3), chebulagic acid (4), pedunculagin (5), quercetin-3-O-beta-2 ''-galloylglucoside (7), and kaempferol-3-O-rhamnoside (12) are described for the first time in this matrix. Furthermore, six compounds were quantified using qNMR. The compounds in the dry extracts are 3, 6 (myricetin-3-O-d-glucoside), 8 (myricitrin), 9 (hyperoside), 10 (guaijaverin) and 11 (quercitrin). These compounds may be considered chemical markers in this matrix. In addition, this extract presents activities of alpha-glucosidase inhibition (IC50=79.9 mu g mL(-1)) and glycation in vitro (IC50=10.2 mu g mL(-1)), in addition to antioxidant activity against DPPH and ABTS radicals (1,856.7 and 1,032.0 mu mol TEq, respectively). This extract did not show significant cytotoxicity in human fibroblasts. Therefore, the enzymatic inhibition, anti-AGE (advanced glycation end-products) and antioxidant activities of Myrcia multiflora leaves corroborated its antidiabetic therapeutic potential and instigates future preclinical studies aimed at the treatment of diabetes mellitus and its complications. (C) 2021 Elsevier B.V. All rights reserved.

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