稀土离子与NAD^+和NAD-LDH相互作用的伏安行为研究

Voltammetric Behavior Studies on the Interaction Between Lanthanide Ions and NAD^+, NAD-LDH Complex

报道了稀土离子与NAD+和NAD－LDH相互作用的伏安行为，研究结果表明，稀土离子能够与NAD+发生作用，使NAD+在-0．94V处的还原峰分裂为2个还原峰；NAD+和LDH在汞电极上可形成络合物，络合物的还原峰在-1．16V处，加入5μmol／LLa3+、Ce3+、pr3+、EU3+、Gd3+、Dy3+、Yb3+和LU3+离子，能增大NAD-LDH络合物的解离常数约40％～70％，说明稀土离子在LDH催化体系中起抑制作用．

Voltammetric behavior studies on the interaction of Ln3+ ions with NAD+ andNAD-LDH complex were presented. The results showed that Ln3+ interacted with NAD+ bydividing the reduction wave of NAD+ at -0. 94 V into two waves, which could be attributedto the binding of Ln3+ ions with the pyrophosphorous moiety of NAD+. The effect of Ln3+ions on NAD+ was progressively eliminated by adding EDTA. On mercury electrode NAD+formed a complex with LDH and was reduced at - 1. 16 V. The dissociation constant ofNAD-LDH was determined. When NAD-LDH complex was formed, the addition of5μmol/L La3+, Ce3+, Pr3+, Eu3+, Gd3+, Dy3+, Yb3+, Lu3+ respectively increased the dis-sociation constant of NAD-LDH complex in the range of 40% ~70%. These results could beused as an explanation for the inhibition of Ln3+ ions on LDH activity.