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Extraction of biologically active compounds from Sideritis ssp. L.

Paper ID Volume ID Publish Year Pages File Format Full-Text
19368 43062 2011 8 PDF Available
Title
Extraction of biologically active compounds from Sideritis ssp. L.
Abstract

In this study extraction of polyphenols and flavonoids from cultivated hybrid Sideritis scardica × Sideritis syriaca, known for its rich content of phenolics and flavonoids with antioxidant activity, was investigated. Extractions have been done by ethanol and water–ethanol, respectively. High equilibrium values of the extracted species were obtained—17.55 mg/(g solid) total phenolics and 5.7 mg/(g solid) total flavonoids with ethanol as solvent. The influence of the solvent on the total yield and the content of biologically active compounds were studied. Maximum polyphenolics and flavonoids extraction was observed for water–ethanol solvent ratio 20/80. Increase of the content of ethanol in the solvents led to lower total yield of extracts but higher percentage of polyphenolics. The extraction kinetics showed that 90% of the phenolic compounds were extracted during the first 2.5 h. The experimental kinetics was described by a constant effective diffusion coefficient De = 1.5 × 10−12 m2/s in the solid, accounting for the actual particle size distribution.

Research highlights▶ Ethanol and water–ethanol extraction of polyphenols and flavonoids from Sideritis L. ▶ Extraction kinetics shows that 90% of the phenolic compounds were extracted during the first 2.5 h. ▶ A maximum in the extracted polyphenols and flavonoids (mg/g of dry solid) was observed with 20/80 water–ethanol solvent. ▶ Experimental kinetics was described by solid diffusion model with constant effective diffusion coefficient.

Keywords
Solid–liquid extraction; Extraction kinetics; Diffusion coefficient; Sideritis L.
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Extraction of biologically active compounds from Sideritis ssp. L.
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 89, Issue 4, October 2011, Pages 273–280
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us