Solubility of Saturated Fatty Acids in Water at Elevated Temperatures

Abstract

The solubility in water of saturated fatty acids with even carbon numbers from 8 to 18 was measured in the temperature range of 60 to 2309 C and at a pressure of 5 or 15 MPa. The pressure had no signiˆcant eŠect on the solubility. The solubility of the fatty acids increased with increasing temperature. At temperatures higher than about 1609 C, the logarithm of the solubility in mole fraction was linearly related to the reciprocal of the absolute temperature for each fatty acid, indicating that the water containing solubilized fatty acid molecules formed a regular solution at the higher temperatures. The enthalpy of a solution of the fatty acids in water, which was evaluated from the linear relationship at the given temperatures, increased linearly with the carbon number of the fatty acid

Solubility of Oleic and Linoleic Acids in Subcritical Water

“…For the convenience of comparison, the solubility of stearic acid is shown in both figures. The solubilities shown by the closed symbols in the figures are cited from our previous study (Khuwijitjaru et al, 2002). The solubility of each fatty acid was higher at higher temperatures.…”

“…E-mail: adachi@kais.kyoto-u.ac.jp acid in water was measured using the same apparatus as that used in our previous report (Khuwijitjaru et al, 2002) under pressures of 15 and 20 MPa at temperatures of 600C…”

“…Therefore, we reported the solubility of saturated fatty acids with even carbon numbers of 8 to 18 in water at 60'C to 230'C under pressures of 5 and 15 MPa (Khuwijitjaru et al, 2002). In this study, the solubility of unsaturated fatty acids, i.e., oleic and linoleic acids, in water was measured in this temperature range.…”

Method of creating starch‐like ultra‐fine rice flour and effect of spray drying on formation of free fatty acid

“…Instead they form a floating film on the top with the carboxyl group oriented toward water and the non-polar groups oriented toward the gaseous phase. The saturated FFA, on the other hand, are more water soluble in nature and the solubility of FFA in water increases with decreasing carbon number or chain length and increasing temperature; butyric acid is completely soluble in water and stearic acid is the least soluble in nature [24][25][26]. These soluble FFA can then enter the starch granules to form amylose-lipid complexes [27].…”

Direct Treatment of Isada Krill under Subcritical Water Conditions to Produce Seasoning with Shrimp-Like Flavor

“…With increasing treatment temperature, the lipid contents of liquid extracts increased from 0.006 to 0.031 kg per kg of raw krill (from 12 to 58 % of total lipid content), whereas those of solid residues decreased from 0.045 to 0.022 kg per kg (from 88 to 42 % of total lipid). Because subcritical water has a low relative dielectric constant (like an organic solvent), which decreases with increasing temperature, more lipids should be extracted and solubilized in the liquid phase at high temperatures (20). For instance, the use of subcritical water to pretreat the oil seed of Datura stramonium increased the yield of extractable lipids by 50 % (21).…”