Synthesis and Physical and Thermodynamic Properties of Lactic Acid and Malic Acid-Based Natural Deep Eutectic Solvents

last updated: 2018-09-14
ProjectDez.Zyme :: publications list
TitleSynthesis and Physical and Thermodynamic Properties of Lactic Acid and Malic Acid-Based Natural Deep Eutectic Solvents
Publication TypePapers in Scientific Journals
Year of Publication2018
AuthorsCastro V., Mano F., Reis R. L., Paiva A., and Duarte A. R. C.
Abstract

In this paper, four natural deep eutectic solvents (NADES) systems were prepared at specific molar ratios, La:Bet (2:1) (lactic acid/betaine), La:Hist (9:1) (lactic acid/histidine), Ma:Bet:H 2 O (1:2:3) (malic acid/betaine/water) and Ma:Bet:Pro:H 2 O (1:1:1:2) (malic acid/betaine/proline/water). Their physical and thermodynamic properties were studied, namely viscosity, electrical conductivity, and heat capacity. The viscosity and electrical conductivity were determined as a function of temperature and the correlation for the temperature dependence was obtained and discussed based on Arrhenius theory. The heat capacity for all eutectic systems was measured by differential scanning calorimetry (DSC) over a temperature range of 293.15−363.15 K. The ability of these NADES to reduce cellulose crystallinity was evaluated. Cellulose crystallinity after suspension in these NADES was studied by X-ray diffraction. Cellulose suspended in Ma/Bet/H 2 O (1:2:3) suffer the highest crystallinity reduction among the systems studied and was about of 20%.

JournalJournal of Chemical and Engineering Data
Volume63
Issue7
Pagination2548-2556
Date Published2018-06-19
PublisherACS
ISSN1520-5134
DOI10.1021/acs.jced.7b01037
URLhttps://pubs.acs.org/doi/10.1021/acs.jced.7b01037
KeywordsNatural deep eutectic solvents, Physical properties, thermodynamic properties
RightsrestrictedAccess
Peer reviewedno
Statuspublished

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