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Comparative Analysis of Autoxidation of Haemoglobin

Frank B. Jensen^*

Institute of Biology, SDU, Odense University, Campusvej 55, DK-5230 Odense M, Denmark

View larger version (17K): [in a new window]   Fig. 1. Examples of the time-dependence of the autoxidation reaction for hagfish (Myxine glutinosa) and carp (Cyprinus carpio) oxyhaemoglobin (oxyHb) at various temperatures. The measurements were carried out in 0.1moll-1 Hepes buffer (pH7.3) at a monomeric haemoglobin concentration of 0.16mmoll-1. [oxyHb]t and [oxyHb]0 are the concentrations of oxyHb at times t and zero, respectively.

View larger version (17K): [in a new window]   Fig. 2. Temperature-dependence of autoxidation of hagfish, carp, yellowfin tuna, lamprey and pig oxyhaemoglobins. The natural logarithm of the measured first-order rate constant (k, h-1) is plotted as a function of the inverse absolute temperature (T, K) (i.e. Arrhenius plots), with temperatures in °C given on the upper x-axis. Values are means ± S.E.M. (N=4–9 at each point).

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