关键词: 无患子皂素, 表面张力, 临界胶束浓度, 泡沫性能, 复配

Abstract: Sapindus mukurossi saponin,a natural non-ionic surfactant,shows excellent surface activity. At 30℃,the value of critical micelle concentration (cmc) is 0.1g/L,and the lowest surface tension (g_cmc) of 48.48mN/m. The values of g_cmc and cmc remained stable at the temperature range of 30—60℃. The lowest surface tension of Sapindus mukurossi saponin decreased greatly when the solution was acidic,while cmc value was unchanged. The lowest surface tension of Sapindus mukurossi saponin at alkaline condition is similar to that under neural condition. Moreover,Sapindus mukurossi saponin has a good resistance to hard water. There is a certain synergy when Sapindus mukurossi saponin compounds with other surfactants,especially when it compounds with cetyl trimethyl ammonium bromide (CTAB). The micellization ability of commixture of Sapindus mukurossi saponin and CTAB increased by 50.0%,while the surface tension decreased by 4.08%. Sapindus mukurossi saponin has a strong foamability and foam stability. The foam height H₀ is 135.6mm according to the GB/T 7162—1994 conditions (concentration 2.5g/L). The initial foam height increased at the commixture system of Sapindus mukurossi saponin.

Key words: Sapindus mukurossi saponin, surface tension, critical micelle concentration, foam property, commixture