用Fourier变换红外光谱法研究没食子酸酯类对人工膜和人血小板膜的作用

本文应用Fourier变换红外光谱法(FTIR)分别探测膜脂质双层碳氢链尾部区、脂相-水相交界区和头部区的物理状态,以了解没食子酸及其酯类(没食子酸乙酯、丙酯、异丁酯、丁酯)的作用机制。结果表明,没食子酸及其酯类都有调节DPPC人工膜和含胆固醇的DPPC人工膜的作用,并呈现量效关系和构效关系。还首次发现,上述酯类也对人血小板膜的结构有调节作用,而且可以使ADP作用后的血小板膜发生可逆性恢复。该类化合物可抵消胆固醇对人工膜和ADP对血小板的作用这一现象,为解释活血化瘀中药作用机制提供一些新的论据。     

Effect of the Esters of Gallic Acid on Model and Human Blood Platelet Membranes Studied by Fourier Transform Infrared Spectroscopy

Gallic acid is one of the components of Chinese herbal drug Radix paeoniae used for promoting blood circulation to remove blood stasis. This paper studied the effects of gallic acid and its esters (e.g. ethyl, propyl, isobutyl and butyl gallate) on model and human blood platelet membranes by FTIR which was used for monitoring the physical state of the acyl chain, interfacial and head group region of the membrane lipid bilayer. From the experimental results it can be seen that the gallic acid and its esters have the modifying function on the pure and cholesterol-containing DPPC model membranes, and have the quantity-effective and structural-effective relationships. In addition, it is discovered that these esters have the modifying effect on the structure of human blood platelet membrane and can reverse the effect of ADP. That the effect of the esters of gallic acid counteracts the effect of cholesterol and ADP on human blood platelet perhaps provides a new explanation of the mechanism of Chinese herbal d