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Two-step high pressure solvent extraction of walnut (Juglans regia L.) husks: scCO2 + CO2/ethanol/H2O

I. J. Seabra,M. Braga,Rute Oliveira,H. D. Sousa

Published 2019 in Journal of CO 2 Utilization

ABSTRACT

Abstract Walnut husks, an abundant agroindustrial residue/waste rich in several bioactive phytochemicals, were subjected to a two-step high pressure solvent extraction methodology using supercritical CO2 (1st step) and a subcritical homogeneous liquid mixture of CO2/ethanol/H2O (0.69:0.28:0.03, molar fractions) (2nd step). Extractions were performed at 35 °C and 45 °C, and from ˜10 MPa up to ˜30 MPa. GC–MS analysis revealed that the most abundant compounds in CO2 extracts were alkanes, terpenes, oxygenated terpenes and alkaloids. The amounts of juglone plus 1,4-naphthoquinone in the 1st and 2nd step extracts were in the 0.33-0.88 mg/g and 0.65–2.77 mg/g range, respectively, and those of total phenols in 2nd step extracts were in the 71.5–116.8 mg GAE/g range. High antioxidant activities were obtained independently of juglone and 1,4-naphtoquinone contents, thus indicating the potential of the applied high pressure methodology to obtain selective extracts for valuable pharmaceutical, agricultural and food applications.

PUBLICATION RECORD

  • Publication year

    2019

  • Venue

    Journal of CO 2 Utilization

  • Publication date

    2019-12-01

  • Fields of study

    Agricultural and Food Sciences, Chemistry, Environmental Science

  • Identifiers
    DOI 10.1016/J.JCOU.2019.07.028
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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