Adsorption Equilibrium and Thermodynamics of Tea Theasinensins on HP20-A High-Efficiency Macroporous Adsorption Resin

The separation and preparation of theasinensins have been hot spots in the field of tea chemistry in recent years. However, information about the mechanism of efficient adsorption of tea theasinensins by resin has been limited. In this study, the adsorption equilibrium and thermodynamics of tea thea...

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Published inFoods Vol. 10; no. 12; p. 2971
Main Authors Zhang, Jianyong, Cui, Hongchun, Xue, Jinjin, Wang, Wei, Wang, Weiwei, Le, Ting, Chen, Lin, Engelhardt, Ulrich H, Jiang, Heyuan
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 02.12.2021
MDPI
Subjects
Acids
Adsorbents
Adsorption
Biological activity
Chromatography
Equilibrium
Exothermic reactions
Food science
Hydrogen bonding
Hydrogen bonds
Hydroxyl groups
Phenolic compounds
Phenols
Porous resins
resin
Resins
Tea
theasinensins
Thermodynamic equilibrium
Thermodynamics
Japan
theasinensins
thermodynamics
adsorption
resin
equilibrium
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Summary:The separation and preparation of theasinensins have been hot spots in the field of tea chemistry in recent years. However, information about the mechanism of efficient adsorption of tea theasinensins by resin has been limited. In this study, the adsorption equilibrium and thermodynamics of tea theasinensins by a high-efficiency macroporous adsorption HP20 resin were evaluated. The adsorption of theasinensin A, theasinensin B, and theasinensin C on HP20 resin were spontaneous physical reaction processes. Adsorption processes were exothermic processes, and lowering the temperature was beneficial to the adsorption. The Freundlich model was more suitable to describe the adsorption of tea theasinensins. The adsorption equilibrium constant and maximum adsorption capacity of theasinensin A were significantly higher than theasinensin B and theasinensin C, which indicated that the adsorption affinity of theasinensin A was stronger than that of theasinensin B and theasinensin C. The phenolic hydroxyl groups and intramolecular hydrogen bonds of theasinensin A were more than those of theasinensin B and theasinensin C, which might be the key to the resin's higher adsorption capacity for theasinensin A. The HP20 resin was very suitable for efficient adsorption of theasinensin A.
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These authors contributed equally to this work.
ISSN:2304-8158
2304-8158
DOI:10.3390/foods10122971