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Adsorption and Desorption Studies of Anthocyanins from Black Peanut Skins on Macroporous Resins

Zhao, Zhenlei, Wu, Min, Jiang, Qi, Zhang, Yuanyuan, Chang, Xiulian, Zhan, Kanghua
International journal of food engineering 2015 v.11 no.6 pp. 841-849
Arachis hypogaea, adsorbents, adsorption, anthocyanins, aqueous solutions, desorption, models, peanuts, porous media, resins, sorption isotherms
Adsorption of black peanut skin anthocyanins, a natural pigment, onto various macroporous resins was optimized to develop a potential approach for large-scale production of black peanut skin anthocyanins. Seven different macroporous resins (AB-8, SP-207, LS-305A, HP-20, LS-305, DM-21 and LS-610B) were evaluated for the adsorption properties of the anthocyanins extracted from the black peanut skins of Arachis hypogaea L. The adsorption experiment proved that compared to AB-8, SP-207 and LS-305A, four resins, i.e., LS-610B, DM-21, LS-305 and HP-20 have relatively higher capacity of adsorbing black peanut skin anthocyanins from the aqueous solution, which are verified by the related adsorption experiments. The adsorption isotherm data was successfully described by Langmuir isotherm model and the pseudo-second-order rate model simulates the kinetic process well. Column adsorption and desorption tests further proved DM-21 is a promising adsorbent for field applications to recover black peanut skin anthocyanins from aqueous solution. The overall yield of pigment product was 14% based on dried black peanut skin, and anthocyanins purity is at about 5.7% in the pigment product.