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Fractionation of Marigold Waxy Extract Using Supercritical CO[sub.2]

Separations, 2023-05, Vol.10 (5) [Peer Reviewed Journal]

COPYRIGHT 2023 MDPI AG ;ISSN: 2297-8739 ;EISSN: 2297-8739 ;DOI: 10.3390/separations10050298

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  • Title:
    Fractionation of Marigold Waxy Extract Using Supercritical CO[sub.2]
  • Author: Zanotti, Alessandra ; Baldino, Lucia ; Scognamiglio, Mariarosa ; Reverchon, Ernesto
  • Subjects: Analysis ; Electronics industry
  • Is Part Of: Separations, 2023-05, Vol.10 (5)
  • Description: Marigold oil is a product of great industrial interest thanks to its wide range of medicinal and wound-healing properties. In this work, supercritical carbon dioxide was used to recover marigold essential oil from the hexane solvent extract of marigold flowers, the floral "concrete". This starting material was mixed with synthetic paraffinic waxes to heighten its melting point and viscosity, thus, improving material processability. Supercritical fluid extraction and fractionation of the modified marigold "concrete" was carried out, and the effect of pressure and CO[sub.2] mass flow rate was studied. The pressure was varied from 80 to 180 bar, keeping the temperature constant at 40 °C: the higher the pressure, the larger the CO[sub.2] solvent power and extraction yield (up to 9.40% w/w). Nevertheless, the optimum between productivity and process selectivity was found at 100 bar. By changing the CO[sub.2] mass flow rate (from 1.20 to 1.50 kg/h), we noted that mass transfer resistance was located externally. GC-MS analysis showed that the most abundant compounds in the oil were δ-cadinene (25%), γ-cadinene (16%), τ-muurolol (6.5%), and α-muurolene (6%). Moreover, the traces of oil and waxes showed no mutual contamination between lighter species and waxes, meaning that the fractionation step was successful.
  • Publisher: MDPI AG
  • Language: English
  • Identifier: ISSN: 2297-8739
    EISSN: 2297-8739
    DOI: 10.3390/separations10050298
  • Source: Directory of Open Access Journals May need to register for free articles
    ROAD: Directory of Open Access Scholarly Resources
    ProQuest Central
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