Solubility determination and correlation, solvent effect and thermodynamic properties of 1,5-gluconolactone in twelve pure solvents at 288.15–328.15 K

Su, Qingquan; Luo, Jiaqi; Zhai, Xinyue; Zou, Yu; Shi, Chuncheng; Shan, Yue; Li, Jun; Yu, Qiushuo

doi:10.1016/j.molliq.2023.122313

Cited by 6 publications

(1 citation statement)

References 59 publications

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“…(2). 17 The solubility data were fitted by the polynomial empirical equation, Apelblat equation and λh equation respectively 18,19

x_{i} = \frac{\frac{m w_{L}}{M_{normalL}}}{\frac{m w_{L}}{M_{L}} + \frac{((), m goodbreak- m w_{L})}{M_{w}}}

…”

Section: Experiments and Data Processingmentioning

confidence: 99%

Purification, characterization and study of blue fluorescent substance in caffeine

Yang,

Yue,

Zhou

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDCaffeine, a xanthine alkaloid compound, is a stimulant of the central nervous system and is mainly used in the pharmaceutical and food industries. Because caffeine is directly absorbed into the body, Chinese pharmacopeia has high requirements on the quality of caffeine products, and fluorescence has always been an important indicator to measure the quality of caffeine. In this study, a major fluorescent impurity affecting the appearance and purity of caffeine products was isolated for the first time, and the solubility, thermodynamic properties and dissociation constants of this impurity were studied.RESULTS(i) The fluorescent impurity affecting the appearance and purity of the product was successfully isolated from crude caffeine and theophylline sodium salt, and named as a blue fluorescent substance. The mass purity of the substance was 96.27 %, and its structure was determined based on a comprehensive analysis of HRMS, and NMR (1H NMR, 13C NMR, COSY, NOESY, HSQC, HMBC). (ii) The solubility of blue fluorescent substance in four pure solvents was determined and the thermodynamic properties were calculated. (iii) The dissociation constants of the blue fluorescent substance in water at 298.15 K were determined by ultraviolet spectrophotometry.CONCLUSIONThe results provide a theoretical basis for the crystallization separation of the blue fluorescent substance during the industrial production of caffeine, as well as basic data for the green synthesis process of caffeine.This article is protected by copyright. All rights reserved.

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“…(2). 17 The solubility data were fitted by the polynomial empirical equation, Apelblat equation and λh equation respectively 18,19

x_{i} = \frac{\frac{m w_{L}}{M_{normalL}}}{\frac{m w_{L}}{M_{L}} + \frac{((), m goodbreak- m w_{L})}{M_{w}}}

…”

Section: Experiments and Data Processingmentioning

confidence: 99%

Purification, characterization and study of blue fluorescent substance in caffeine

Yang,

Yue,

Zhou

et al. 2024

J of Chemical Tech & Biotech

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show abstract

Solubility measurement, molecular simulations, Hansen solubility parameter and thermodynamic properties of isophthalic acid in binary solvents at 283.15–323.15 K

Zhai,

Luo,

et al. 2024

The Journal of Chemical Thermodynamics

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Equilibrium solubility, solvent effect, equation correlation, and thermodynamic properties of cyclododecanone in twelve organic solvents

Zhao,

Zhang,

Liu

et al. 2023

Journal of Molecular Liquids

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Solubility determination and correlation, solvent effect and thermodynamic properties of 1,5-gluconolactone in twelve pure solvents at 288.15–328.15 K

Cited by 6 publications

References 59 publications

Purification, characterization and study of blue fluorescent substance in caffeine

Purification, characterization and study of blue fluorescent substance in caffeine

Solubility measurement, molecular simulations, Hansen solubility parameter and thermodynamic properties of isophthalic acid in binary solvents at 283.15–323.15 K

Equilibrium solubility, solvent effect, equation correlation, and thermodynamic properties of cyclododecanone in twelve organic solvents

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