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Enhanced-performance extraction of olive (Olea europaea) leaf polyphenols using L-lactic acid/ammonium acetate deep eutectic solvent combined with β-cyclodextrin: screening, optimisation, temperature effects and stability

  • Donia Chakroun
  • Spyros Grigorakis
  • Sofia Loupassaki
  • Dimitris P. MakrisEmail author
Original Article
  • 19 Downloads

Abstract

This investigation had as objective to study the effective recovery of olive leaf (OLL) polyphenols using a blend of an L-lactic acid/ammonium acetate deep eutectic solvent (DES) with β-cyclodextrin (β-CD). Following an initial DES screening, the extraction process was optimised with response surface methodology by implementing Box-Behnken design. The optimised extraction conditions thus determined were stirring speed 300 rpm, DES concentration 56.4% (w/w), liquid-to-solid ratio 100 mL g−1 and β-CD concentration 0.7% (w/v). Maximum extraction yield (113.66 mg caffeic acid equivalents g−1 dry mass) was achieved at 80 °C, without compromising antioxidant activity. Comparative assessment of the extraction medium DES/β-CD with other green solvents showed that it was a high-performing system providing polyphenol-enriched extract with improved antioxidant characteristics. Stability test of the extract obtained under optimal conditions performed over a period of 30 days at ambient conditions revealed that, while ferric-reducing power fluctuated within narrow limits, the antiradical activity was enormously enhanced by 100%. These changes in the antioxidant activity were not associated with the decline of major polyphenols in the OLL extract. However, the overall polyphenolic profile remained largely unchanged. It is suggested that the DES/β-CD is an efficient green solvent that may confer the OLL polyphenol extract satisfactory stability.

Keywords

Antioxidants β-Cyclodextrin Deep eutectic solvents Extraction Olive leaf Polyphenols 

Nomenclature

AAR

Antiradical activity (μmol DPPH g−1)

CDES

Deep eutectic solvent concentration (% w/w)

CTFn

Total flavonoid concentration (mg RtE L−1)

CTP

Total polyphenol concentration (mg CAE L−1)

dm

Dry mass (g)

PR

Reducing power (μmol AAE g−1)

\( {R}_{\mathrm{mol}}^{\mathrm{D}/\mathrm{A}} \)

HBD:HBA molar ratio (dimensionless)

RL/S

Liquid-to-solid ratio (mL g−1)

T

Temperature (°C)

YTFn

Yield in total flavonoids (mg RtE g−1)

YTP

Yield in total polyphenols (mg GAE g−1)

Abbreviations

AAE

Ascorbic acid equivalents

CAE

Caffeic acid equivalents

β-CD

β-Cyclodextrin

DES

Deep eutectic solvent

DPPH

2,2-Diphenyl-1-picrylhydrazyl radical

HBA

Hydrogen bond acceptor

HBD

Hydrogen bond donor

LA

Lactic acid

OLL

Olive leaves

RtE

Rutin equivalents

TPTZ

2,4,6-Tripyridyl-s-triazine

Notes

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Donia Chakroun
    • 1
  • Spyros Grigorakis
    • 1
  • Sofia Loupassaki
    • 1
  • Dimitris P. Makris
    • 2
    Email author
  1. 1.Food Quality & Chemistry of Natural Products, Mediterranean Agronomic Institute of Chania (M.A.I.Ch.), International Centre for Advanced Mediterranean Agronomic Studies (CIHEAM)ChaniaGreece
  2. 2.Green Processes & Biorefinery Group, School of Agricultural SciencesUniversity of ThessalyKarditsaGreece

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