此外，还有(racemize)和(mesomeride)，一个混合了相同份量的一对（两种）光学异构体被称为外消旋混合物(racemic mixture)，外消旋混合物是没有折光性的（甚至当两种异构体被分开来，两部分都仍旧没有折光性因为外消旋体的光学异构体可以相互转化，最后...
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从螺旋理论看，芳香轮烯和非芳香轮烯都是内消旋体和外消旋体的混合物，故都不呈现旋光性。
In the light of the helix theory, aromatic annulenes and non-aromatic annulcncs are all the mixture of the mesomer and raceme, so they haven't opticity activeity.
聚合物作为高效液相色谱的固定相，消旋体酮洛芬在固定相能分开，同时聚合物还能将酮洛芬和布洛芬的混合物分开。
Racemic ketoprofen was separated when the polymer was used as a stationary phase of high performance liquid chromatography. The mixture of ketoprofen and ibuprofen were also separated by this polymer.
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