Abstract:

In order to improve the storage stability of soybean lecithin, the hydrogenation of soybean lecithin powder at the condition of supercritical carbon dioxide was performed. The hydrogenation reaction was conducted by using Pd/C as the catalyst, aqueous ethanol and dichloromethane (1:3, V/V) as the reaction solvent. The optimal hydrogenation processing conditions were explored to be catalyst amount of 4%, reaction temperature of 70 ℃, reaction time of 60 min, stirring speed of 250 r/min and reaction pressure of 10.5 MPa. The hydrogenated lecithin was light yellow, and its iodine value was 27.81 g I2/100 g. Meanwhile, the hydrogenated lecithin had better storage stability.

Key words: supercritical fluid, power lecithin, storage stability, hydrogenation, iodine value