“…A number of research avenues have been explored to counter these issues and both potentiometric [31][32][33][34][35][36][37][38][39][40][41][42][43][44] and voltammetric [ 16-20 , 45-51 ] methodologies have been pursued. In most cases, a functional material containing pH sensitive components is applied to the surface of an appropriate sensor substrate through a variety of methods that include: Adsorption/monolayer, [ 39,48 ] polymer fi lms, [ 36 ] screen printed inks, [ 35,38,40,47 ] covalent attachment, [ 46,47 ] or electrodeposition. [ 32,33,37,[42][43][44]50 ] Screen printed electrochemical sensors have been designed specifi cally for wound pH monitoring applications and shown to be a versatile addition.…”