TES sodium is a buffering agent (pKa=7.550 at 25°C). TES sodium is one of the Good's buffers, the buffer capacity ranging pH 6.8-8.2[1][2].
[1]. N E Good, et al. Hydrogen ion buffers for biological research. Biochemistry. 1966 Feb;5(2):467-77.
[2]. A Itagaki, et al. Tes and HEPES buffers in mammalian cell cultures and viral studies: problem of carbon dioxide requirement. Exp Cell Res. 1974 Feb;83(2):351-61.
















