Chemical characterisation, antioxidant and antibacterial activities of Pinus pinaster ait. and Pinus pinea L. bark polar extracts: prospecting forestry by-products as renewable sources of bioactive compounds

Patrícia A. B. Ramos, Carla Pereira, Ana Peixoto Gomes, Rodrigo T. Neto, Adelaide Almeida, Sónia A. O. Santos*, Artur M. S. Silva, Armando J. D. Silvestre

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
126 Downloads

Abstract

Agroforestry by-products have gained rising attention in recent years as they represent inexpensive and abundant raw materials that are a source of added-value chemicals, e.g., for food and pharmaceutical applications, as well as for bioenergy generation. Pinus pinaster Ait. bark extracts are consumed worldwide for their cardiovascular benefits, whilst the health potential of Pinus pinea L. bark has not yet been deeply exploited. Therefore, this study highlights the chemical characterisation of Portuguese P. pinaster Ait. and P. pinea L. bark polar extracts, via ultra-high performance liquid chromatography-diode array detection-tandem mass spectrometry (UHPLC-DAD-MSn) analysis, and their antioxidant and antibacterial activities. Quinic acid, an A-type procyanidin dimer isomer, protocatechuic acid, and quercetin were identified for the first time as P. pinea L. bark components. Moreover, this bark demonstrated a higher total content of identified polar compounds than P. pinaster Ait. bark, with quinic acid being the most abundant compound identified. Regarding antioxidant activity, the pine bark polar extracts exhibited strong reducing power and 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2-azinobis-(3-ethyl-benzothiazoline-6-sulfonic acid (ABTS) radical scavenging effects compared to natural antioxidants. Moreover, the bactericidal actions of pine bark extracts were shown against Staphylococcus aureus and Escherichia coli at a 3.13–25 mg mL−1 range. Globally, these promising insights can boost the sustainable exploitation of P. pinea L. bark, as already occurs with P. pinaster Ait. bark, for the food and biomedical fields.
Original languageEnglish
Article number784
JournalApplied Sciences
Volume12
Issue number2
DOIs
Publication statusPublished - 1 Jan 2022
Externally publishedYes

Keywords

  • Antibacterial activity
  • Antioxidant activity
  • Biorefinery
  • Phenolic compounds
  • Pine bark polar extracts
  • Pinus pinaster Ait
  • Pinus pinea L
  • Quinic acid
  • UHPLC-DAD-MS analysis

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