fulltext.study @t Gmail

Empirical kinetic models for the resinoid extraction from aerial parts of St. John's wort (Hypericum perforatum L.)

Paper ID Volume ID Publish Year Pages File Format Full-Text
4408 225 2008 11 PDF Available
Title
Empirical kinetic models for the resinoid extraction from aerial parts of St. John's wort (Hypericum perforatum L.)
Abstract

The empirical kinetic models for the resinoid extraction from St. John's worth (Hypericum perforatum L.) aerial parts were analyzed to choose the optimum one regarding their relative simplicity and accuracy of fitting the experimental data obtained at different operating conditions. The following two-parametric models were analyzed: a parabolic diffusion model, a power law equation, a hyperbola equation, an exponential equation of the Weibull type and a logarithmic relation of the Elovich type. The aqueous solutions of ethanol (70 and 95% by volume) were used to isolate the resinoid from a charge of the ground plant material (the plant material-to-solvent ratio: 1:5 and 1:10 g/mL; the extraction temperature: 25, 50 and about 80 °C; and the mean plant particle size: 0.23, 0.57 and 1.05 mm). All empirical models gave a good fit to the experimental data (root mean square, RMS < ±5%), but the best one was Elovich's equation having the smallest RMS (±2.5%) and the highest linear correlation coefficient (0.975). The best empirical model was somewhat better than the physical model based on the film theory (RMS = ±2.8%). The effects of the process factors on the kinetic model parameters were assessed using the full factorial test plan 24.

Keywords
Solid–liquid extraction; Extraction kinetics; Empirical models; St. John's worth; Hypericum perforatum L.; Full factorial plan
First Page Preview
Empirical kinetic models for the resinoid extraction from aerial parts of St. John's wort (Hypericum perforatum L.)
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 41, Issue 1, 1 August 2008, Pages 1–11
Authors
, , ,
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