Deptt. of Physics and Electronics, Lal Bahadur Shastri Mahavidyalaya, Dharmabad, Dist. Nanded, MS, India.
Deptt. of Physics and Electronics, Lal Bahadur Shastri Mahavidyalaya, Dharmabad, Dist. Nanded, MS, India.
Carbohydr Res. 2021 Sep;507:108375. doi: 10.1016/j.carres.2021.108375. Epub 2021 Jun 18.
Time domain reflectometry (TDR) technique has been extensively used to study dielectric relaxation and solution properties of carbohydrates. Using TDR techninque, complex permittivity spectra of monosaccharides (d-fructose and d-xylose) and disaccharides (d-maltose monohydrates) were obtained in the frequency range of 10 MHz-50 GHz at various concentrations and temperatures. The static dielectric constant (ε), dielectric constant at high frequency (ε), relaxation time (τ) and relaxation time distribution parameter (β) extracted from the complex permittivity spectra using least squares fit method. The values of static dielectric constant were also verified by LCR meter by dielectric measurement in the frequency range of 20Hz to 2 MHz at 25 °C. The relaxation behavior of aqueous solutions of monosaccharides and disaccharides has been illustrated by using Cole-Davidson model. Activation enthalpy (ΔH), entropy (ΔS) and Kirkwood correlation factor have been determined to study extent of hydrogen bonding. This data might be useful in pharmaceutical, food processing industry and in solubility prediction method in aqueous solution.
时域反射（TDR）技术已被广泛用于研究碳水化合物的介电弛豫和溶液性质。使用 TDR 技术，在 10 MHz-50 GHz 的频率范围内，在不同浓度和温度下，获得了单糖（d-果糖和 d-木糖）和二糖（d-麦芽糖一水合物）的复介电常数谱。通过最小二乘法拟合从复介电常数谱中提取出静态介电常数（ε）、高频介电常数（ε）、弛豫时间（τ）和弛豫时间分布参数（β）。通过在 25°C 下在 20Hz 至 2MHz 的频率范围内进行介电测量，用 LCR 仪表验证了静态介电常数的值。利用科尔-戴维森模型说明了单糖和二糖水溶液的弛豫行为。为了研究氢键的程度，确定了活化焓（ΔH）、熵（ΔS）和 Kirkwood 相关因子。这些数据可能对制药、食品加工行业以及水溶液中的溶解度预测方法有用。
