SO_2在水和有机溶剂中的化学形态及其脂/水分配系数:SO_2生理学研究新模式Chemical Status of Sulfur Dioxide in Water and Organic Solvents and Its Lipid/Water Partition Coefficient:A New Model for Physiological Study of Sulfur Dioxide
孟紫强;郭掌珍;
摘要(Abstract):
为了探讨内源性SO2生理作用和毒理作用的化学机制,采用真空减压法、超声波法、通气法、光谱扫描法及摇瓶法等对SO2在水和有机溶剂中的化学形态及其脂/水分配系数进行了研究.研究结果表明:1)气态SO2不仅易溶于水,而且更易溶于有机溶剂;2)SO2在水和有机溶剂中的溶解主要是物理性溶解,其主要以SO2分子状态存在于溶液中,在饱和溶液中90%以上是以自由分子状态存在,在较低浓度下也有50%左右以自由分子状态存在;3)SO2的脂/水分配系数仅为0.16~0.20,使存在于生物膜(脂相)系统的内源性SO2很容易进入水相并转化为亚硫酸盐,这将导致其在组织细胞内的半寿期很短,这符合信号分子的特征.由此结论:1)以SO2生理盐水溶液作为SO2供体,可作为研究内源性SO2生理作用和毒理作用的新模式;2)内源性SO2在组织细胞内的失活途径是:SO2→SO32-/HSO3-→SO42-.此外,论文认为亚硫酸钠和亚硫酸氢钠混合液并不能作为"SO2供体"用以处理生物组织.
关键词(KeyWords): 二氧化硫;二氧化硫供体;脂/水分配系数;失活途径;生理研究新模式;真空减压;饱和溶解度
基金项目(Foundation): 国家自然科学基金项目(No.20677035;No.20477023);; 山西省自然科学基金项目(No.20031092)
作者(Author): 孟紫强;郭掌珍;
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