engleski

Influence of temperature on extraction kinetics and effective diffusivity of total polyphenols from grape seeds

The solid liquid extractions of total polyphenols from grape (Frankovka) seeds using of 50% aqueous ethanol as solvent at different temperature regimes were undertaken. The polyphenols in the extracts was determined by Folin Ciocalteau method and results were expressed as gallic acid equivalent. Extraction kinetic was estimated using non experimental two-parameter equation - modified Peleg´s model. Results showed a good prediction of Peleg´s model for extraction kinetics in all experiments (R ~ 0.99). The effective diffusivity was calculated by Fick’ s law of diffusion. The highest value of polyphenol concentration (129.59 mg GAE/gdb) and effective diffusivity (1.96• 10-12 m2/s) were obtained at the 80 °C.

grape seeds; effective diffusivity; extraction kinetics; total polyphenols

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