亚相pH对气水界面上VE/DPPC单分子膜的影响

通过表面压－分子面积等温线的测定，考察了亚相ｐＨ对气水界面上的维生素Ｅ（ＶＥ）／二棕榈酰基磷脂酰胆碱单分子膜的影响。亚相ｐＨ降低不改变ＤＰＰＣ单分子膜的崩裂压，但使ＶＥ单分子膜的崩裂压明显增大，不改变ＶＥ单分子膜的平均分子面积，但使ＤＰＰＣ单分子膜凝缩，低表面压下，ＶＥ对ＤＰＰＣ单分子膜的膨胀作用在纯水上很小，在ｐＨ为１的亚相上则很明显，这提示在低ｐＨ的亚相上，ＶＥ／ＤＰＰＣ单分子膜中的极性头基间

Affect of Subphase pH on the Behavior 0f the Monolayers at the Air/Water Interface for Vitamin E and Dipalmitoylphosphatidylcholine

The affect of subphase pH on the monolayers at air/water interphase for vitaminE and dipalndtoylphosphatidylcholine was investigated by determining the surface pressure-areaisothermis. Decrease in subphase pH didn't change the collapse pressure of monolayer for DPPC,but led to obvious increase in that for VE, it also didn't change the area per molecule of monolayerfor VE, but caused DPPC monolayer to be condensed. At lower surface pressure, the action ofVE to the expansion of DPPC monolayer was small on pure water, but large on the subphase ofpH=1. It suggests that interactions between the polar head groups may play an important role inthe behavior of the VE/DPPC monolayers on the subphase of lower pH.