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Natural deep eutectic solvents ( NADES ) based on citric acid and sucrose as a potential green technology: a comprehensive study of water inclusion and its effect on thermal, physical and rheological properties
Author(s) -
Savi Lizandra Kamradt,
Dias Mariana Carolina Gipiela Corrêa,
Carpine Danielle,
Waszczynskyj Nina,
Ribani Rosemary Hoffmann,
Haminiuk Charles Windson Isidoro
Publication year - 2019
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/ijfs.14013
Subject(s) - rheology , citric acid , viscosity , chemistry , arrhenius equation , sucrose , deep eutectic solvent , thermal stability , solvent , chemical engineering , water content , water activity , thermal decomposition , eutectic system , thermodynamics , food science , organic chemistry , activation energy , alloy , engineering , physics , geotechnical engineering
Summary In this work, NADES based on sucrose and citric acid was synthesised and evaluated. Physical properties such as density, viscosity and thermal profile were evaluated at different temperatures and water contents. Viscosity and density were inversely affected by temperature and water content. Increases in the sucrose fraction resulted in higher viscosity, but no differences in density were observed. The rheological model of Ostwald‐de‐Waele indicated three distinct rheological behaviours at different temperatures, water content and sucrose fractions. The Arrhenius model showed a good fit for the temperature effect on the apparent viscosity of all NADES s. The NADES decomposition temperature was approximately 393 K. The thermal characterisation revealed that all NADES s presented glass transitions at temperatures below 204.59 K, confirming their formation and stability. Based on these results, the NADES proposed appears as potential green solvent to be used in industrial processes such as extraction, separation and biochemical technology.