Partition coefficients of quinones and hydroquinones and their relation to biochemical reactivity
- 20 August 1990
- journal article
- Published by Wiley in FEBS Letters
- Vol. 269 (1) , 139-144
- https://doi.org/10.1016/0014-5793(90)81139-f
Abstract
Some major effects of ring substituents on the partition coefficients of quinone headgroups are described. Attention is drawn to the large differences in partition coefficients in cyclohexane/water of the two major freely diffusing redox forms, the quinone, Q, and the hydroquinone, QH2. Methoxy substituents cause a marked increase of the cyclohexane/water partition coefficient of the hydroquinone, but this effect is absent in the quinone and is also not seen in measurements in octanol/water. The relation between partition coefficients and biochemical specificity of quinone binding sites is explored.Keywords
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