采用微孔淀粉吸附茶多酚：动力学、平衡和热力学研究。
Adsorption of Tea Polyphenols using Microporous Starch: A Study of Kinetics, Equilibrium and Thermodynamics.
机构信息
State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China.
College of Horticulture and Gardening, Yangtze University, Jingzhou 434025, China.
出版信息
Molecules. 2019 Apr 12;24(8):1449. doi: 10.3390/molecules24081449.
Microporous starch (MPS) granules were formed by the partial hydrolysis of starch using α-amylase and glucoamylase. Due to its biodegradability and safety, MPS was employed to adsorb tea polyphenols (TPS) based on their microporous characteristics. The influences of solution pH, time, initial concentration and temperature on the adsorptive capacity were investigated. The adsorption kinetics data conformed to the pseudo second-order kinetics model, and the equilibrium adsorption data were well described by the Langmuir isotherm model. According to the fitting of the adsorption isotherm formula, the maximum adsorption capacity of TPS onto MPS at pH 6.7 and T = 293 K was approximately 63.1 mg/g. The thermodynamic parameters suggested that the adsorption of TPS onto MPS was spontaneous and exothermic. Fourier transform infrared (FT-IR) analysis and the thermodynamics data were consistent with a physical adsorption mechanism. In addition, MPS-loaded TPS had better stability during long-term storage at ambient temperature.
微孔淀粉（MPS）颗粒是通过α-淀粉酶和糖化酶对淀粉进行部分水解而形成的。由于其生物降解性和安全性，MPS 被用于基于其微孔特性吸附茶多酚（TPS）。考察了溶液 pH 值、时间、初始浓度和温度对吸附容量的影响。吸附动力学数据符合拟二级动力学模型，平衡吸附数据很好地符合 Langmuir 等温线模型。根据吸附等温线公式的拟合，在 pH 6.7 和 T = 293 K 下，TPS 对 MPS 的最大吸附容量约为 63.1 mg/g。热力学参数表明，TPS 吸附到 MPS 上是自发和放热的。傅里叶变换红外（FT-IR）分析和热力学数据与物理吸附机制一致。此外，在室温下长期储存时，负载 TPS 的 MPS 具有更好的稳定性。
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