马脾铁蛋白释放铁的反应级数和速率相数的转换  

TRANSFER OF REACTION ORDERS AND PHASE NUMBERS OF IRON RELEASE RATE OF HORSE SPLEEN FERRITIN

作　　者：黄河清[1] 张凤章[1] 林庆梅[2] 曾润颖[3] 邱雪慧[1] 许良树[1] 

机构地区：[1]厦门大学生物学系,厦门361005 [2]厦门大学环境科学研究中心,厦门361006 [3]国家海洋局第三海洋研究所,厦门361005

出　　处：《动物学报》1999年第2期170-177,共8页ACTA ZOOLOGICA SINICA

基　　金：国家自然科学基金!49876027;国家教育部回国留学人员基金

摘　　要：采用差示法研究铁蛋白释放铁的动力学规律和反应级数的转换。结果表明：马脾铁蛋白释放铁的速率及相数与还原剂Na2S2O4。浓度及铁还原速率无关，与该蛋白蛋白壳的调节速率有关。在pH50～6．0范围内，马脾铁蛋白以三相不同速率方式释放占原铁核总铁量80％的铁。但在pH9．0介质中，OH-不仅能参与铁蛋白铁核组成，减缓释放铁的速率，而且使原混合级反应转换为一级反应，从而使铁蛋白释放铁的动力学过程由复杂转化为简单。A differential technique was used to study kinetics about the law of iron release as well as the transfer of reaction order of horse spleen ferritin. The rate of iron release and the phasic numbers from ferritin are independent of the reducer (Na2S2O4) concentration and the rate of iron reduction, but related to the regulation rate of the protein shell. Ferritin released 80% of its original iron content at different rates of three phases between pH 5. 0 and 6.0. However, at pH 9. 0 of the medium, OH- ions not only took part in the composition of the iron core and retard the rate of iron release from the ferritin, but also caused the rate of reaction turn from mix-orders to first-order, thus transferring the complicated process of kinetics of iron release into a simple form.

关 键 词：马脾 铁蛋白 释放铁动力学 反应级数 

分 类 号：Q513.402[生物学—生物化学]