To study the effect of static magnetic fields on the biologically significant chemical reaction between ascorbic acid and Fremy's salt (in the framework of the radical pair mechanism theory; the radical pair being composed by the paramagnetic Fremy's salt and by the intermediate radical of ascorbic acid, the ascorbyl). The aim of this study was to look into the basic chemical step of magnetic field effect and not to consider complex additional factors normally present in living organisms.
According to radical pair mechanism, the magnetic field acts on a pair of weakly coupled radicals during their approach and before the expected interaction.
| Exposure | Parameters |
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Exposure 1:
Exposure duration:
not specified
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Exposure 2:
Exposure duration:
not specified
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| Frequency | |
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| Type | |
| Exposure duration | not specified |
| Exposure source | |
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| Setup | not specified |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 0.5 mT | minimum | - | - | - |
| magnetic flux density | 1.5 mT | - | - | - | - |
| magnetic flux density | 4 mT | - | - | - | - |
| magnetic flux density | 6 mT | maximum | - | - | - |
| Frequency | |
|---|---|
| Type | |
| Exposure duration | not specified |
| Exposure source |
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|---|---|
| Setup | scan range 0.8 mT, sweep time 35 s, time constant 100 ms, modulation frequency 100 kHz, modulation amplitude 0.1 mT, microwave power source 280 mW, attenuation 10 dB |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 350 mT | - | - | - | - |
The data indicate that the reaction rate depended on the magnetic flux density. The samples exposed to the magnetic field always showed a faster decay process than the control one, except at 0.5 mT in which the reaction rate was slower.
The time scale of the studied reaction and the improved electron paramagnetic resonance system allowed the direct comparison of the amplitude differences between exposed and control samples under strictly same boundary conditions, with the further possibility to identify and follow radicals and intermediate products during the whole slow phase of the nitroxide reduction.
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