Insights into kinetic, isotherm, and thermodynamic of ultrasound mode- and amplitude-dependent carotenoid and chlorophyll degradation or/and adsorption.

Autor: Maleki S; Department of Civil Engineering, Faculty of Engineering, Fasa University, Fasa, Iran. Electronic address: s.maleki@fasau.ac.ir., Abedi E; Department of Food Science and Technology, Faculty of Agriculture, Fasa University, Fasa, Iran. Electronic address: e.abedi@fasau.ac.ir., Hashemi SMB; Department of Food Science and Technology, Faculty of Agriculture, Fasa University, Fasa, Iran.
Jazyk: angličtina
Zdroj: Ultrasonics sonochemistry [Ultrason Sonochem] 2024 Dec; Vol. 111, pp. 107130. Date of Electronic Publication: 2024 Oct 28.
DOI: 10.1016/j.ultsonch.2024.107130
Abstrakt: Experimental data were analyzed to investigate the underlying adsorption or degradation mechanism of carotenoids and chlorophylls over the bleaching of sunflower oil through different amplitudes of horn and bath ultrasound (ultrasound-assisted bleaching; UAB), temperature, time, and bleaching clay. Quantifying the color removal efficiency in both batch and continuous systems, along with the corresponding process time and energy consumption, is paramount for evaluating the energy-related performance of the treatment method. The adsorption of pigments onto activated bentonite was notably rapid and effective when ultrasound was employed. In both bleaching processes, the adsorption kinetics of carotenoids and chlorophyll exhibited a pseudo-second-order behavior. At the same time, a pseudo-first-order equation provided a better fit for the control conditions. Moreover, intra-particle diffusion contributed to the adsorption mechanism, although it was not the only rate-limiting step in the adsorption of pigments on the clay. It is hypothesized that carotenoid and chlorophyll adsorption occur through physisorption in control conditions, while chemical reactions play a role in pigment removal under sonication. The Freundlich isotherm yielded precise estimates of the adsorption equilibrium data for carotenoid and chlorophyll during ultrasonic bleaching, suggesting a multilayer adsorption mechanism under ultrasound exposure. The thermodynamic study found that pigment adsorption was feasible, spontaneous, and endothermic. According to the results, horn and bath ultrasound, especially at higher voltages, can remarkably remove carotenoid and chlorophyll from sunflower oil compared to the traditional bleaching process.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Recent findings conducted on rapeseed oil [13], rice bran oil [2], and olive oil [15] have indicated that the ultrasonic bleaching with an ultrasound horn exhibits an endothermic nature and follows the Freundlich isotherm model. Nevertheless, these studies did not make any assumptions regarding the kinetics of the adsorption or degradation behavior of concomitant carotenoids and chlorophylls by ultrasonic baths and probes at different amplitudes. Limited studies focus on different ultrasound modes, mainly bath and horn, highlighting the need for a comprehensive insight into the degradation and adsorption behavior of pigments and the underlying mechanisms during this process. Therefore, this investigation aims to comprehensively determine the kinetics, isotherms and thermodynamics of carotenoids and chlorophyll adsorption/degradation under various sonication modes and power conditions, bleaching clay, and temperature. Determining the color removal efficiency in batch and continuous modes while considering the time required and energy expenditure provides essential insights for optimizing the process from an energy perspective.
(Copyright © 2024 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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