Study on Vapor–Liquid Equilibrium and Microscopic Properties of Glycine + H₂O, l-Histidine + H₂O, and l-Tryptophan + H₂O

Study on Vapor–Liquid Equilibrium of l-Lysine, l-Arginine, and l-Threonine Aqueous Solutions

“…The preliminary research has firmly established the practical utility of the experimental equipment employed and the trustworthiness of the results obtained. 9,25 Drawing support from previous findings, a series of experiments were conducted on the VLE of amino acid aqueous solutions, yielding the data presented in Tables 2−4. The experimental findings revealed that the solubility levels of L-lysine, L-arginine, and L-threonine were 1.561, 1.116, and 0.787 mol kg −1 , respectively.…”

“…The system was deemed to have reached equilibrium if the condensate maintained a reflux rate of 2–3 drops per second and the temperature remained constant for 15 min. Time and pressure data were recorded, and the atmospheric pressure was observed before each experiment to account for diurnal fluctuations. , …”

“…Time and pressure data were recorded, and the atmospheric pressure was observed before each experiment to account for diurnal fluctuations. 9,25 2.3.2. COSMOthermX Calculation.…”

“…h i represents the hydration number of the solute, n refers to the number of solute species in an electrolytic solution, M s is the molecular weight of water, m i denotes the molality of the solute, and m w represents the molality of free water. 9,21,25 In this work, it is assumed that in a mixed electrolyte solution, all solutes can be considered as a single solute unit. Under this assumption, the mixed electrolyte solution is considered to be a binary solution.…”

“…When α = 0.3, the model fits the experimental data best. As a result, hydrated entity molecules and free water molecules coexist in the solution. m w = 100 M normals − prefix∑ i = 1 n ( h i m i ) h i represents the hydration number of the solute, n refers to the number of solute species in an electrolytic solution, M s is the molecular weight of water, m i denotes the molality of the solute, and m w represents the molality of free water. ,, …”