Aqueous solubility of some natural phenolic compounds

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Fátima L. Mota (Author) FEUP; António J. Queimada (Author) FEUP; Simão P. Pinho (Author) Other; Eugénia A. Macedo (Author) FEUP

Journal

Title: Industrial & Engineering Chemistry Research

Vol. 47

Pages: 5182-5189

ISSN: 0888-5885

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 104 Citations

ISI Web of Science

Scopus - 150 Citations

COMPENDEX

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

CORDIS: Technological sciences > Engineering

Other information

Authenticus ID: P-003-X37

DOI: 10.1021/ie071452o

Abstract (EN): In this work, the aqueous solubilities of two hydroxybenzoic acids (gallic and salicylic acid) and three phenylpropenoic acids (trans-cinnamic, ferulic, and caffeic acids) are addressed. Measurements were performed, as a function of temperature, between 288.15 and 323.15 K, using the shake-flask method for generating the saturated aqueous solutions, followed by compositional analysis by spectrophotometric and gravimetric methods. The pH values of the saturated aqueous solutions were measured by potentiometry. Additional thermodynamic properties, which are fundamental for a better understanding of the solubilization process, as well as necessary for the modeling studies, such as melting temperatures and fusion enthalpies were determined by differential scanning calorimetry (DSC). Apparent acid dissociation constants (K-a) were obtained by potentiometry titration. The measured data were modeled with the cubic-plus-association (CPA) equation of state (EoS). This EoS is applied, for the first time, for multifunctional associating molecules, and the results indicate that it can adequately be used to represent the measured and other literature data with satisfactory accuracy.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8