皂角苷对芘的增溶作用及影响因素

研究了一种从植物中提取的生物表面活性剂--皂角苷(saponin)对芘的增溶作用,以及pH、离子强度、重金属离子等对增溶作用的影响.结果表明,皂角苷对芘有明显的增溶作用,其质量溶解率(WSR)约为0.0467,大于常用的Triton X、Brij、Tween等类型的非离子表面活性剂,说明皂角苷能更有效地增强芘的溶解.皂...

Enhanced solubilization of pyrene by saponin,a plant-derived biosurfactant

Biosurfactants have great advantages in the remediation of organic contaminated soils as their environmental friendly nature. The solubilization of saponin, a plant-derived biosurfactant, for pyrene were studied and the results indicated that saponin can greatly enhance the solubilization of pyrene in solution and the weight solubilization ratio (MSR) of saponin for pyrene was greater than those of some representative nonionic surfactants. The enhanced solubilization of saponin for pyrene showed strong dependence on the solution pH and ionic strength, and decreased with solution pH increased from 4.0 to 8.0, but increased with NaCl concentration increased from 0.01 mol•L-1 to 1.0 mol•L-1, which can be attributed to the increased or decreased critical micelle concentration (CMC) of saponin solution with the changing pH or ionic strength. Saponin was more effective to enhance pyrene solubilization at low pH and high ionic strength. In addition, heavy metal ions (Zn2+ and Cd2+) can also enhance the solubilization of saponin for pyrene as the decreased pH and CMC of saponin solution.