Phase equilibria of phenolic compounds in water or ethanol

Laetitia, Cesari; Namysl, Sylvain; Canabady-Rochelle, Laetitia; Mutelet, Fabrice

doi:10.1016/j.fluid.2017.09.008

Cited by 29 publications

(18 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all cases, the data in this work are in good agreement with the reference values, according to the criteria defined in the above-mentioned publication. 37 With regard to binary system water (1) + guaiacol (2), the solubility of guaiacol in water at 303.15 K found in this work (26.8 g•kg −1 ) is in good agreement with the data reported by Beezer et al 39 (23.3 g•dm −3 at 298.15 K), Tam et al 40 (24.8 at g•dm −3 at 298.15 K), and Cesari et al 41 (25 g•kg −1 at 303.15 K). At higher temperature, the solubility found in this work (31.6 g•kg −1 at 328.15 K) seems to be slightly higher than that reported by Cesari et al 41 (27.6 g• kg −1 at 323.15 K).…”

Section: Resultssupporting

confidence: 92%

Liquid–Liquid Equilibrium of Water + 2-Methoxyphenol + Methyl Isobutyl Ketone and Water + 1,2-Benzenediol + Methyl Isobutyl Ketone at 303.15 K and 328.15 K

2018

View full text Add to dashboard Cite

Liquid–liquid equilibrium (LLE) experiments for the systems water + 2-methoxyphenol + MIBK and water + 1,2-benzenediol + MIBK were carried out at 303.15 and 328.15 K according to a procedure allowing the measurement of both the composition of the phases in equilibrium and their relative amounts. Binary LLE data of subsystems water + MIBK and water + 2-methoxyphenol were also measured, as was the solubility of 1,2-benzenediol in water. The experimental data were modeled using the NRTL activity coefficient model, with optimal energy parameters calculated from the experimental data. The NRTL model proved to be adequate in describing the LLE phase behavior of the systems investigated, and it can be used for the process design of liquid–liquid extraction of these aromatic solutes from aqueous phases. MIBK proved to be an efficient extractant for 2-methoxyphenol and 1,2-benzenediol, even though the distribution factors for 2-methoxyphenol are 4–5 times higher than those for 1,2-benzenediol. The results are relevant to the design of extraction processes aimed at recovering phenols from wastewater or aqueous phases produced in the hydrothermal conversion of biomass, such as in the case of the conversion of lignin, which is a byproduct of pulp mills and lignocellulosic bioethanol plants.

show abstract

Section: Resultssupporting

confidence: 92%

Liquid–Liquid Equilibrium of Water + 2-Methoxyphenol + Methyl Isobutyl Ketone and Water + 1,2-Benzenediol + Methyl Isobutyl Ketone at 303.15 K and 328.15 K

2018

View full text Add to dashboard Cite

show abstract

“…Conversely, TEAC presented an optimal percentage of ethanol that was very low (5%) (Table 8). This may be because the catechol group present in some phenolic compounds has a higher solubility in water [41]. As mentioned above, the catechol group is of great importance in the FRAP assay, but also in the TEAC assay.…”

Section: Citriodora Leaves Ple Modelmentioning

confidence: 99%

Comprehensive Analysis of Antioxidant Compounds from Lippia citriodora and Hibiscus sabdariffa Green Extracts Attained by Response Surface Methodology

Villegas-Aguilar

Leyva-Jiménez²,

Cádiz-Gurrea

et al. 2020

Antioxidants

View full text Add to dashboard Cite

Phenolic compounds have shown to have a high bioactive potential against various pathologies, postulating as an interesting alternative to manage some diseases. In this sense, both Lippia citriodora and Hibiscus sabdariffa are two botanical sources with a demonstrated high bioactive potential, in which their antioxidant capacity stands out. In this work, the optimization of the extraction conditions for the recovery of phytochemicals from L. citriodora leaves and H. sabdariffa calyces has been carried out using Response Surface Methodologies (RSM) considering their total polar compounds measured by HPLC-ESI-TOF/MS and Folin-Ciocalteu assay, and its antioxidant capacity evaluated by Ferric Reducing Antioxidant Power (FRAP) and Trolox Equivalent Antioxidant Capacity (TEAC) assays. The results showed that to maximize the antioxidant capacity in H. sabdariffa, a moderate temperature and high ethanol percentage are needed, while a low temperature and a high percentage of ethanol are needed in L. citriodora. In addition, with the results obtained in the multiple response analysis, it is possible to affirm the importance of this type of analysis to develop functional ingredients, taking into account both total content of phenolic compounds and their bioactivity. Furthermore, as confirmed in this study, these analyses can be extrapolated in different techniques and in different matrices, with phenolic compounds from different families being important to develop new high added value products for food, pharmaceutical or cosmetic industries.

show abstract

“…A wide range of phenolic model compounds (such as phenol, guaiacol, cresol and anisole) have been applied in biomass HDO reactions. [159][160][161][162] And, in HDO reactions, the type of reaction product and the differences in reaction pathways strongly depend on the catalyst. Recently, Teles et al 163 investigated the effect of metal type on the selective HDO reaction of phenol over silica-loaded catalysts.…”

Section: Hdo Of Phenolsmentioning

confidence: 99%