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Received August 10, 2022
Accepted October 26, 2022
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Poly(ethylene glycol) (PEG)-based microgels embedded with magnetic nanoparticles for tannin removal and valorization
Department of Chemical Engineering, Pohang University of Science and Technology(POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Korea
Korean Journal of Chemical Engineering, February 2023, 40(2), 445-451(7), 10.1007/s11814-022-1328-4
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Abstract
Excess tannin in drinks can lead to unpleasant astringent taste, pinking or browning, as well as a decrease in clarity. While protein precipitation method in which various proteins and synthetic polymers are added to induce tannin-protein complexation, followed by separation via sedimentation, is widely used for tannin removal, sedimentation time can take up to few days. In this work, we present poly(ethylene glycol) (PEG)-based microgels embedded with magnetic nanoparticles (MNP) as fining agents for effective adsorption and removal of tannins, using tannic acid (TA) as the model tannin. The PEG microgel with high surface area enables the tannins to effectively adsorb through hydrogen- bonding, and the incorporated MNP enables facile recovery of TA adsorbed microgel via magnetic decantation. We also demonstrate that the PEG microgel is reusable and the TA adsorbed can be also valorized into ellagic acid (EA) by simple base treatment of the TA adsorbed microgels.
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Siebert KJ, Lynn PY, J. Agric. Food Chem., 45, 4275 (1997)
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Gaonkar AG, in Food processing, Gun Trägrdh, Elsevier Science B.V., Amsterdam (1995).
Vernhet A, Bellon-Fontaine MN, Brillouet JM, Roesink E, Moutounet M, J. Membr. Sci., 128, 163 (1997)
Kim Y, Han SH, Jeon JY, Hwang M, Im YJ, Chae SW, Kim MG, J. Korean Soc. Food Sci. Nutr., 41, 1554 (2012)
Makkar HP, Quantification of tannins in tree and shrub foliage: A laboratory manual, Springer Science & Business Media (2003).
Mizusawa K, Imai Y, Yuasa K, Koyama H, Yamaji N, Kataoka S, Oguma T, US Patent, 5,231,193 (1993).
Choi D, Lee W, Lee Y, Kim DN, Park J, Koh WG, J. Chem. Technol. Biotechnol., 83, 252 (2008)
Wang T, Deng J, Ran R, Shi W, Gao Y, Ren X, Cao J, Zhang M, Chem. Eng. J., 449, 137486 (2022)
Tuominen A, Sundman T, Phytochem. Anal., 24, 424 (2013)
