The extraction process of the sterols from faba pods and its kinetic investigation and thermodynamic analysis

doi:10.14088/j.cnki.issn0439-8114.2023.11.023

Abstract

Abstract: In order to improve the utilization rate of the byproduct old faba pods, the extraction technology of the sterols from faba pods was studied with ethanol aqueous solution as the extraction agent, and the kinetic investigation and thermodynamic analysis of the extraction process were carried out. The optimal liquid-solid ratio, ethanol volume fraction and stirring rate were determined by single factor test investigation; the relationship between sterols concentration and extraction time was measured at different extraction temperatures, the first-order kinetic plate model was used to fit the experimental data; the activation energy, internal diffusion coefficient, Gibbs free energy, enthalpy and entropy of the extraction process of sterols from faba pods were calculated. The results showed that the sterols were successfully extracted from faba pods, and the yield of sterols was 6.2 mg/g. The liquid-solid ratio, ethanol volume fraction, stirring rate, extraction temperature and extraction time had effects on sterols yield. The suitable extraction process was the liquid-solid ratio of 20∶1, ethanol volume fraction of 80%, stirring rate of 200 r/min, and extraction time of 1.0 h. The first-order kinetic plate model was suitable for describing the extraction process of sterols. The activation energy of extraction was 22.50 kJ/mol in the range of temperatures examined. The internal diffusion coefficient increased from 2.08×10^-10 m²/min to 4.95×10^-10 m²/min with increasing extraction temperature. The Gibbs free energy of the extraction process was less than zero at all extraction temperatures, indicating that the extraction of sterol from old faba pods was a spontaneous process. The enthalpy and entropy of the extraction process of sterols from faba pods were 28.26 kJ/mol and 102.26 J/（mol·K）, which indicated that the extraction process of sterols from faba pods was endothermic and increased entropy. The results could provide reference for large-scale application of the extraction of faba pods sterols.

Key words: faba pod, sterols, exctraction, model, kinetics, thermodynamics

CLC Number:

TQ645.98

YANG Xu, ZHU Ai-shi, LIAO Yu-chen. The extraction process of the sterols from faba pods and its kinetic investigation and thermodynamic analysis[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(11): 131-136.

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