The 2,4-dinitrophenylation of thiol or amino group with 1,2,4-trinitrobenzene proceeded quantitatively at pH 8.5 and 30 °C. The rate of S-dinitrophenylation was ≈104 times faster than that of N-dinitrophenylation. So this reaction can be used for both the determination of thiol even in the presence of large excess amine and the specific modification of thiol in proteins.
硫醇或
氨基与
1,2,4-三硝基苯的 2,4-
二硝基苯基化反应在 pH 8.5 和 30 °C 下定量进行。 S-
二硝基苯基化的速率比N-
二硝基苯基化的速率快约104倍。因此,该反应既可用于在存在大量过量胺的情况下测定
硫醇,又可用于蛋白质中
硫醇的特异性修饰。