Preparation of P(EGDMA-co-VPBA) Adsorbent and Its Application in the Separation of Steviol Glycosides,Macromolecular Chemistry and Physics

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Preparation of P(EGDMA-co-VPBA) Adsorbent and Its Application in the Separation of Steviol Glycosides
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2021-07-02 , DOI: 10.1002/macp.202100145
Qiaoge Fu ₁ , Nana Chen ₁ , Guanyu Wang ₁ , Ruili Guo ₁

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The poly (ethylene glycol dimethacrylate-co-vinylphenylboronic acid) P(EGDMA-co-VPBA) adsorbents are prepared via reversible addition-fragmentation chain transfer (RAFT) precipitation polymerization with 4-vinylphenylboronic acid (VPBA) as the functional monomer, and used for selective adsorption of steviol glycosides (SGs). The boron content and pore structure of the P(EGDMA-co-VPBA) adsorbent are adjusted by changing the polymerization conditions. The adsorption results show that the pore structure of the P(EGDMA-co-VPBA) affects the adsorption capacity to SGs, the presence of boric acid functional groups shows favorable adsorption selectivity for stevioside (STV), and the adsorption selectivity is proportional to the content of boric acid in P(EGDMA-co-VPBA) adsorbents. The adsorption performance of P(EGDMA-co-VPBA) toward SGs is the best when the ratio of monomer to cross-linker is 1:50 and the solvent is acetonitrile. In the SG solution (6.0 mg mL⁻¹, C_STV/C_RA = 1:1), the adsorption capacities and adsorption selectivity (α_STV/RA) of P(EGDMA-co-VPBA) to SGs are 113.20 mg g^–1 and 4.99, respectively. The adsorption kinetics and isotherm data obey pseudo-second-order kinetic model and Langmuir isotherm model, respectively. The boric acid copolymers with VPBA as the monomer prepared by the one-step method can become a promising material for efficient separation and purification of SGs.

中文翻译：

P(EGDMA-co-VPBA)吸附剂的制备及其在分离甜菊糖苷中的应用

以4-乙烯基苯基硼酸(VPBA)为功能单体，通过可逆加成-断裂链转移(RAFT)沉淀聚合制备聚(乙二醇二甲基丙烯酸酯-co-乙烯基苯基硼酸)P(EGDMA- co- VPBA)吸附剂，并使用用于选择性吸附甜菊糖苷 (SG)。P(EGDMA- co- VPBA)吸附剂的硼含量和孔结构通过改变聚合条件来调节。吸附结果表明，P(EGDMA- co-VPBA) 影响对 SGs 的吸附能力，硼酸官能团的存在对甜菊苷 (STV) 显示出良好的吸附选择性，并且吸附选择性与 P(EGDMA- co -VPBA) 吸附剂中硼酸的含量成正比。当单体与交联剂的比例为1:50且溶剂为乙腈时，P(EGDMA- co- VPBA)对SGs的吸附性能最好。在SG溶液（6.0 mg mL ^-1，C _STV / C _RA = 1:1）中，P(EGDMA- co- VPBA)对SGs的吸附容量和吸附选择性（α _STV/RA）为113.20 mg g ^{– 1}和 4.99，分别。吸附动力学和等温线数据分别服从准二级动力学模型和朗缪尔等温线模型。一步法制备的以VPBA为单体的硼酸共聚物可成为高效分离纯化SGs的一种很有前景的材料。

更新日期：2021-09-07

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