College of Sciences, Central South University of Forestry and Technology, Changsha 410004, China.
College of Material Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China.
Int J Mol Sci. 2022 Oct 28;23(21):13089. doi: 10.3390/ijms232113089.
To produce antioxidant substances from agricultural waste spp. fruit shells before their further utilization, gallic acid from five kinds of spp. fruit shells was separated on specific recognition by deep eutectic solvent molecularly imprinted polymers (DES@MIPs), which were prepared by bulk polymerization using gallic acid as the template and deep eutectic solvents (α-methylacrylic acid and choline chloride) as functional monomers. The optimized DES@MIPs were characterized by scanning electron microscopy, particle size analysis, nitrogen sorption porosimetry, elemental analysis, Fourier transform infrared spectroscopy, and thermal gravimetric analysis. The adsorptive behavior of gallic acid on DES@MIPs was also investigated. The results indicated that DES@MIPs were successfully prepared as mesoporous materials with average pore diameter of 9.65 nm and total pore volume of 0.315 cm g, and the adsorption behavior was multilayer adsorption and pseudo-second-order kinetics with the saturation adsorptive capacity of gallic acid reaching 0.7110 mmol g. Although the content of gallic acid in five fruit shells was quite different, the purification recovery of gallic acid was high, ranging from 87.85-96.75% with a purity over 80%. Thus, the purification of gallic acid from spp. fruit shells could be realized feasibly using DES@MIPs with favorable economic and environmental benefits.
为了在进一步利用之前从农业废弃物 spp. 水果壳中生产抗氧化物质，使用深共晶溶剂分子印迹聚合物 (DES@MIPs) 通过特异性识别从五种 spp. 水果壳中分离没食子酸，深共晶溶剂（α-甲基丙烯酸和氯化胆碱）作为功能单体，通过本体聚合制备深共晶溶剂分子印迹聚合物。通过扫描电子显微镜、粒度分析、氮气吸附孔隙率分析、元素分析、傅里叶变换红外光谱和热重分析对优化后的 DES@MIPs 进行了表征。还研究了没食子酸在 DES@MIPs 上的吸附行为。结果表明，DES@MIPs 成功地作为介孔材料制备，平均孔径为 9.65nm，总孔体积为 0.315cm3g，吸附行为是多层吸附和伪二阶动力学，没食子酸的饱和吸附容量达到 0.7110mmol g。尽管五种水果壳中没食子酸的含量差异很大，但没食子酸的纯化回收率很高，范围在 87.85%-96.75%之间，纯度超过 80%。因此，使用 DES@MIPs 可以从 spp. 水果壳中实现没食子酸的纯化，具有良好的经济效益和环境效益。
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