Physicochemical and thermodynamic properties of solutions of clary sage (Salvia sclarea L.) essential oil in ethanol-water system

Abstract

Clary sage (Salvia sclarea L.) essential oil-ethanol-water system was investigated. The surface tension, density and refractive index of clary sage essential oil + ethanol (70%, 75%, 80%, 85%, 90%, and 95%) solutions were measured. The chemical composition of solutions (ratio 1:5, 1:6, and 1:7) was determined using GC/MS analysis. According the experimental results ternary phase diagrams were constructed. Comparative revue between experimental and calculated surface tension data was done. After analyses good correlation between two surface tension values was observed

Investigation of the thermodynamic and physicochemical properties of lavender oil (Lavandula angustifoliaMill.)-ethanol-water system

“…The difference between linalyl acetate and lavender solutions is based on lower values for specific heat capacity, which is probably due to the fact that lavender solutions involve the main components of lavender oil. The obtained results on the coefficient of thermal conductivity and thermal difusivity for solutions of lavender oil-ethanol-water are close to the values for solutions of linalool-ethanol-water presented in [17,22], which is explained by the fact that the components involved in the solutions are oxygen-containing monoterpenes.…”

“…The presented results in Table 2 have shown that all physicochemical dimensions decreased their values when ethanol in solutions increased as quantity. Surface tension and refractive index for pure ethanol are: γ = 22.80 mN.m -1 and ρ = 0.789 kg.m -3 [17]. The values of refractive index presented some small variations in the last solutions prepared with 90% and 95% ethanol.…”

“…Three thermal parameters according calculations obtained in this work: λ = 0.33 W. m -1 K -1 ; Cp = 31.661 -52.635 кJ.mol -1 K -1 ; a = 6.277 -10.435.10 -6 m 2 .s -1 . In literature are given results for same components of essential oil linalool and linalyl acetate, and the results compared with literature data for the same parameters, obtained experimentally [17,22,27].…”

“…2.1.6.Thermodynamic and thermal parameters calculations. Some thermodynamic and thermal properties (Gibbs energy, entropy, enthalpy, thermal conductivity, thermal diffusivity and specific heat capacity) were calculated to determine the stability of the system of lavender oil-ethanol-water [17].…”

Investigation of the thermodynamic and thermal properties of clary sage (Salvia sclareaL.) essential oil and its main components

“…2.1.4 Chemical composition of the essential oil. GC analysis was performed using gas chromatograph Agilent 7890A [17] 2.1.5 Thermodynamic and thermal properties of the essential oil and its main compounds. Specific heat capacity is obtained by eq.…”