Experimental measurement and correlation of solubility of β-carotene in pure and ethanol-modified subcritical water

doi:10.1016/j.cjche.2020.07.006

Abstract

Abstract: For the first time, the solubility of β-carotene in pure and ethanol-modified subcritical water (SW) using the static method was determined. The experimental runs were performed at a temperature ranging from 298.15 to 403.15 K and 0-10% (w/w) of ethanol as a modifier at a constant pressure of 5 MPa. Samples were analyzed by UV-vis spectrophotometer. The solubility of β-carotene was found to range from 1.084×10^-8 to 227.1×10^-8 mol fractions in the subcritical water in above mentioned conditions. The obtained β-carotene solubility data were correlated using the linear model and modified Apelblat model. The obtained results showed the modified Apelblat model was better for estimating the solubility of β-carotene in SW. The values of the rootmean-square deviation (RMSD) between experimental and correlated data were calculated and used as the index of validity and accuracy for the model. Also, thermodynamic properties of the solution such as the Gibbs free energy of solution, enthalpy, and entropy of solution were estimated.

Key words: Subcritical water, β-Carotene, Solubility, Semi-empirical model

摘要： For the first time, the solubility of β-carotene in pure and ethanol-modified subcritical water (SW) using the static method was determined. The experimental runs were performed at a temperature ranging from 298.15 to 403.15 K and 0-10% (w/w) of ethanol as a modifier at a constant pressure of 5 MPa. Samples were analyzed by UV-vis spectrophotometer. The solubility of β-carotene was found to range from 1.084×10^-8 to 227.1×10^-8 mol fractions in the subcritical water in above mentioned conditions. The obtained β-carotene solubility data were correlated using the linear model and modified Apelblat model. The obtained results showed the modified Apelblat model was better for estimating the solubility of β-carotene in SW. The values of the rootmean-square deviation (RMSD) between experimental and correlated data were calculated and used as the index of validity and accuracy for the model. Also, thermodynamic properties of the solution such as the Gibbs free energy of solution, enthalpy, and entropy of solution were estimated.

关键词: Subcritical water, β-Carotene, Solubility, Semi-empirical model

Hadi Share Mohammadi, Ali Haghighi Asl, Maryam Khajenoori. Experimental measurement and correlation of solubility of β-carotene in pure and ethanol-modified subcritical water[J]. Chinese Journal of Chemical Engineering, 2020, 28(10): 2620-2625.

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