Results and discussion Fenton reagent induced aggregation of ssDNA ndash

Three of the prepared sensors were used for MA detection (at 2.5 mg mL−1) on the day of preparation, and the remaining stored in a freezer (−18 °C). Three sensors were subsequently removed from the freezer and used for MA detection every day over a one week Ibuprofen and then on a weekly basis for a further 3 weeks and finally after 2 and 3 months and the results are presented in Fig. 6.