The enzyme PPO's activity in different pH has influenced the
response. Similar results have been already reported for similar
systems such as PPO entrapped into PPO immobilized onto PANI
film (Wang et al., 2009), PPO entrapped into PANI film (Tan et al.,
2010). Hence pH 6.5 is chosen for the development of biosensor
using PEDOT-rGO-Fe2O3-PPO.