“…This indicates that adsorbed GICA is more resistant towards pH changes. Improvement of pH stability for immobilized GI was also observed in various study (Jin, et al, 2017;Kamal, Hegazy, Sharada, Abd elhalim, Lotfy, & Mohamed, 2014;Tumturk, Demirel, Altinok, Aksoy, & Hasirci, 2008;Zhao, Cui, Shah, Xu, & Wang, 2016).…”