EXTRACTION OF FREE AND BOUND PHENOLICS FROM GLABROUS CANARY SEED (Phalaris canariensis L.) HULLS

Authors

  • María Ximena Durruty Grupo de Investigación TECSE – Dpto. de Ing. Química y Tecnología de los Alimentos, Facultad de Ingeniería, Universidad Nacional del Centro de la Provincia de Buenos Aires, Olavarría, Buenos Aires, Argentina. CIC - Comisión de Investigaciones Científicas de la Provincia de Buenos Aires
  • María Marcela Rodríguez Grupo de Investigación TECSE – Dpto. de Ing. Química y Tecnología de los Alimentos, Facultad de Ingeniería, Universidad Nacional del Centro de la Provincia de Buenos Aires, Olavarría, Buenos Aires, Argentina. CCT Tandil (CONICET)
  • Ana Karina de Figueiredo Grupo de Investigación TECSE – Dpto. de Ing. Química y Tecnología de los Alimentos, Facultad de Ingeniería, Universidad Nacional del Centro de la Provincia de Buenos Aires, Olavarría, Buenos Aires, Argentina.
  • Carmen Margarita Mateo Grupo de Investigación TECSE – Dpto. de Ing. Química y Tecnología de los Alimentos, Facultad de Ingeniería, Universidad Nacional del Centro de la Provincia de Buenos Aires, Olavarría, Buenos Aires, Argentina.
  • Susana María Nolasco Grupo de Investigación TECSE – Dpto. de Ing. Química y Tecnología de los Alimentos, Facultad de Ingeniería, Universidad Nacional del Centro de la Provincia de Buenos Aires, Olavarría, Buenos Aires, Argentina.
  • Isabel Concepción Riccobene Grupo de Investigación TECSE – Dpto. de Ing. Química y Tecnología de los Alimentos, Facultad de Ingeniería, Universidad Nacional del Centro de la Provincia de Buenos Aires, Olavarría, Buenos Aires, Argentina.

DOI:

https://doi.org/10.52292/j.laar.2024.1268

Keywords:

phenolic, antioxidant activity, ethanol, canary seed, hulls

Abstract

The aim was to extract free phenolics using a green solvent (ethanol), and bound phenolics from glabrous canary seed hulls. The efficiency of ethanol 75% was compared with that of other solvents used in the literature (acetone 70%; methanol 80%) in terms of phenolic yield and antioxidant activity. Bound phenolics were extracted with ethyl acetate, prior to hydrolysis with NaOH 2 M. The phenolic extracts obtained were characterized according to extraction yield, total phenols, flavonoides, antioxidant activity, radical DPPH; and phenolic profile, HPLC. Methanol 80% had lower extraction yield, and acetone 70% had lower antioxidant activity; whereas ethanol 75% was the most efficient solvent to obtain free phenolics. Extraction yield of bound phenolics (6411.13 mg/100g hulls d.b.) doubled the value of free phenolics. Thus, antioxidant activity was four times higher (78.67% inhibition of radical DPPH). On the other hand, phenolic acids predominated over flavonoids compounds in a rate 26/1. Ferulic acid was the dominant (42.48 mg/100g hulls), followed by p-coumaric (39.07 mg/100g hulls). Although the use of glabrous canary seed is new, interest in its processing at industrial level makes canary seed hulls a potential waste material that could be leveraged as a source of bioactive compounds with several applications.

Published

2024-01-01