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The impact of low temperature on fraction unbound for plasma and tissue

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The effect of low temperature (4 °C) on plasma protein binding and tissue binding was evaluated for the first time using a large set of structurally diverse compounds covering a wide range of physiochemical properties and fraction unbound values. These results show that temperature has little effect on plasma protein binding and tissue binding and that the measured binding values at 4 °C are equivalent, on average, to those at physiological temperature (37 °C). The exception is indomethacin, where binding component(s) changed during long incubation at 37 °C. These data suggest that binding experiments can be conducted at 4 °C for unstable compounds in early drug discovery. Furthermore, plasma protein binding and tissue binding are likely to have little change during hypothermia conditions.
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Keywords: plasma protein binding; plasma stability; prodrugs; temperature effect; tissue binding

Document Type: Short Communication

Publication date: November 1, 2018

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