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Food and Bioprocess Technology

, Volume 6, Issue 3, pp 806–817 | Cite as

Total Phenolics, Flavonoids, and Antioxidant Activity of Sage (Salvia officinalis L.) Plants as Affected by Different Drying Methods

  • Ibtissem Hamrouni-SellamiEmail author
  • Fatma Zohra Rahali
  • Iness Bettaieb Rebey
  • Soumaya Bourgou
  • Ferid Limam
  • Brahim Marzouk
Original Paper

Abstract

In the current study, we determined the effects of seven drying methods on total phenolics, flavonoids, individual phenolics, and antioxidant activity of the methanol extract of Salvia officinalis L. As compared with total phenolic content (TPC) of fresh plants, results showed that the highest TPC was recorded in plants dried by microwave (MW) at a power of 800 W/30 g of fresh plant and was 4.2 times higher than that of fresh plants whereas the lowest content was found in the case of plants dried by far-infrared (FIR) at 45 °C. The analysis of the different extracts by RP-HPLC showed a predominance of phenolic acids particularly in fresh plants and those dried by MW (600 W/30 g of fresh plant) whereas flavonoids predominate in the case of plants dried by FIR (65 °C). The assessment of the radical scavenging activity (RSA) against the stable radical 1,1-diphenyl-1-picrylhydrazyl (DPPH) showed an increase in the scavenging effect particularly in MW (800 W/30 g of fresh plant) dried plants with an IC50 = 13.49 μg ml−1 (IC50 is the concentration required to cause 50 % DPPH inhibition). The complementary assessment of the RSA using the β-carotene/linoleic acid system showed an increase of this activity for all extracts and particularly for the extract derived from MW (600 W/30 g of fresh plant) dried plants as compared to fresh ones. Finally, all the plant extracts showed moderate reducing power as assessed by the ferric-reducing antioxidant potential. These results suggested that MW drying could be applied to retain phenolic contents and to enhance antioxidant activity of sage plant materials.

Keywords

Salvia officinalis L. Drying Microwave Far-infrared Phenolics Flavonoids Antioxidant activity 

Notes

Acknowledgments

We thank Dr. Mihoubi Daoued (Energetic and Thermal Processing Laboratory, CRTE, B.P. 95, 2050 Hammam-Lif, Tunisia) for the technical support of infrared drying experiments and for his helpful recommendations.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Ibtissem Hamrouni-Sellami
    • 1
    Email author
  • Fatma Zohra Rahali
    • 1
  • Iness Bettaieb Rebey
    • 1
  • Soumaya Bourgou
    • 1
  • Ferid Limam
    • 1
  • Brahim Marzouk
    • 1
  1. 1.Laboratory of Bioactive SubstancesCenter of Biotechnology of the Techno pole Borj-CedriaHammam-LifTunisia

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