Abstract
After stimulation of the washed human blood platelets by arachidonic acid (AA), the concurrent evaluations for formed malondialdehyde (MDA) measured by the common photometrical thiobarbituric acid (TBA) method, and for thormboxane B 2 (TXB 2 measured by gas chromatography, revealed that the formed MDA exceeded the amount of TXB 2 on a molar base. However, MDA and TXB 2 originating from thromboxane synthesis activity should be produced in approximately equimolar amounts. By treatment of the stimulated platelet samples with stannous chloride it is possible to reduce all peroxidized products of AA which generate MDA otherwise during the TBA reaction and to estimate MDA and TXB 2 in a ratio of nearly 1:1. the stannous chloride treatment does not destroy the MDA and does not influence the TBA reaction with MDA. Therefore the simple and quick TBA method can be used after stannous chloride treatment for estimation of thromboxane synthase activity in AA stimulated washed human platelets.
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