Physico-Chemical Study of the Adsorption of Carotenoids from Carrots on Raw and Modified Kaolinites  

作　　者：Orléans Ngomo Etienne Dongo Joseph Sieliechi Orléans Ngomo;Etienne Dongo;Joseph Sieliechi(Department of Organic Chemistry, Faculty of Sciences, University of Yaoundé I, Yaounde, Cameroon;Department of Applied Chemistry, The National School of Agro-Industrial Sciences, University of Ngaoundere, Ngaoundere, Cameroon)

机构地区：[1]Department of Organic Chemistry, Faculty of Sciences, University of Yaoundé I, Yaounde, Cameroon [2]Department of Applied Chemistry, The National School of Agro-Industrial Sciences, University of Ngaoundere, Ngaoundere, Cameroon

出　　处：《Advances in Chemical Engineering and Science》2023年第2期132-148,共17页化学工程与科学期刊（英文）

摘　　要：This study focuses on the adsorption at temperatures below 70℃, of carotenoids from carrots on clay materials such as kaolinite in the raw state, activated with a 0.5 M HCl solution or treated with a sodium solution of Al⁺. The kinetic study of carotenoid adsorption shows that equilibrium is reached after 30 minutes and the temperature has little influence on carotenoid adsorption. On the other hand, the quantities adsorbed at equilibrium increase with the initial concentration of carotenoids. The kinetic model that best describes the experimental data is that of the pseudo-second order, adsorption is made in two time. For the carotenoid adsorption isotherms, the best correlation is obtained with the Freundlich model. The low values of the Freundlich constants indicate that the adsorption is probably of a physical type. This conclusion is confirmed by the effective desorption of carotenoids observed during desorption experiments.This study focuses on the adsorption at temperatures below 70℃, of carotenoids from carrots on clay materials such as kaolinite in the raw state, activated with a 0.5 M HCl solution or treated with a sodium solution of Al⁺. The kinetic study of carotenoid adsorption shows that equilibrium is reached after 30 minutes and the temperature has little influence on carotenoid adsorption. On the other hand, the quantities adsorbed at equilibrium increase with the initial concentration of carotenoids. The kinetic model that best describes the experimental data is that of the pseudo-second order, adsorption is made in two time. For the carotenoid adsorption isotherms, the best correlation is obtained with the Freundlich model. The low values of the Freundlich constants indicate that the adsorption is probably of a physical type. This conclusion is confirmed by the effective desorption of carotenoids observed during desorption experiments.

关 键 词：KAOLINITE CARROTS Antioxidant COSMETIC ADSORPTION 

分 类 号：O64[理学—物理化学]