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Journal of Tea Science ›› 2016, Vol. 36 ›› Issue (4): 396-404.

### Research on Adsorption Characteristics of Tea Polysaccharides to Fluorine

GAO Huimin, ZHU Xiaojing, LI Panpan, NI Dejiang, CHEN Yuqiong*

1. Key Laboratory of Horticultural Plant Biology , Ministry of Education/College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China
• Received:2016-03-08 Published:2019-08-26

Abstract: The adsorption characteristics of tea polysaccharides (TPS) to fluorine under different temperatures and dose of fluoride was studied. The adsorption models were established and the structure and composition of TPS were analyzed. The results showed that the temperature was an important factor influencing fluorine adsorption of TPS. Loose surface structure was observed in TPS under 40℃ by SEM, which showed the strongest adsorption ability to fluorine. With the increase of temperature, the surface structure of TPS gradually became dense, while the adsorption ability to fluorine descended. However, the adsorption ability to fluorine increased after 70℃. The amount of fluorine absorption by TPS increased with the increasing of exposure amount of fluoride with its peak at 1.8 times of polysaccharide under 40℃. The adsorption behavior was in accordance with Langmuir model with the distribution factors (RL) between 0 and 1 and belonged to a favorable adsorption. As proteins and pigments were removed,, structure and composition of crude polysaccharides changed greatly, with sharp decrease of F-, Al3+, Fe3+ and Mn2+ contents and fluorine adsorption capacity. The results suggest that the characteristics of fluorine absorption is related to the composition and structure of polysaccharides. Proteins, Mn2+, Al3+ and Fe3+ might also play important roles in it.

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