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Frequency dependence of the proton magnetic relaxation in aqueous solutions of haemoproteins

✍ Scribed by G. Lahajnar; I. Zupančič; R. Blinc; Greta Pifat; S. Maričić

Publisher
Wiley (John Wiley & Sons)
Year
1974
Tongue
English
Weight
337 KB
Volume
13
Category
Article
ISSN
0006-3525

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✦ Synopsis

The longitudinal proton magnetic relaxation times TI were measured for ferri (met)and carbonmonoxy-bovine haemoglobin and equine myoglobin in 0.1 M KH2P04 aqueous solutions near pH 6 a t 5°C and 35°C from 1.5-to 60-MHx Larmor frequencies. I t is concluded that the correlation time T C for the dipole-dipole interaction of electron and nuclear spins is in fact the electron (ferric) spin relaxation time 7 s being close to 1..5 X At 35°C the paramagnetic relaxation rates are not determined solely by the relaxation of protons exchanging from the haem pocket with bulk solvent. Hence, 7~ at 33°C cannot be calculated from the dispersion data obtained a t this temperature. The relevance of this for the determination of interspin distances T is discussed. sec for both metHb and methfb at 5°C.

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