MES (2-Morpholinoethanesulphonic acid) sodium salt, a zwitterionic buffer, is effective in the pH range of 5.5-7.7. MES sodium salt, as one of the Good's buffers, is broadly used to regulate pH value for plants culture medium, reagent solution, and physiological experiments[1][2].
[1]. Kagenishi T, et al. MES Buffer Affects Arabidopsis Root Apex Zonation and Root Growth by Suppressing Superoxide Generation in Root Apex. Front Plant Sci. 2016;7:79. Published 2016 Feb 18. [2]. Mash HE, et al. Complexation of copper by zwitterionic aminosulfonic (good) buffers. Anal Chem. 2003;75(3):671-677.