3.3.3. Selectivity
Similar experiments were carried out for two other short chain aliphatic alcohols: methanol and 1-propanol and the analytical parameters obtained were compared. Table 2 summarises the analytical parameters calculated from the calibration curves recorded for each alcohol. As expected, on increasing the length of aliphatic alcohol chain, the sensitivity of the biosensor decreases as also shown in other studies [28,42].
3.3.4. Stability
The AOX/PANI biosensor dip sticks were stored at 4 °C when not in use. In order to check the storage stability, a colour change of the biosensor toward ethanol (1%) was checked regularly every week. After 1 week, the biosensor response decreased by only 1.5%. A dramatic decrease was observed however after seven weeks of storage. The biosensor response decreased by about 9.5% from the initial value, which means that the biosensor could be used up to seven weeks, since within these periods the colour change of the biosensor can be detected by the naked eye. However, after eight weeks, the biosensor response continues to decrease, maintaining 70%, of the initial response as shown in Figure 6. This is very promising achievement with respect to the stability of the biosensor response, since it is well known from previous studies that AOX has a poor long-term stability which was its main disadvantage in previous biosensors [42–44].
3.3.3. SelectivitySimilar experiments were carried out for two other short chain aliphatic alcohols: methanol and 1-propanol and the analytical parameters obtained were compared. Table 2 summarises the analytical parameters calculated from the calibration curves recorded for each alcohol. As expected, on increasing the length of aliphatic alcohol chain, the sensitivity of the biosensor decreases as also shown in other studies [28,42].3.3.4. StabilityThe AOX/PANI biosensor dip sticks were stored at 4 °C when not in use. In order to check the storage stability, a colour change of the biosensor toward ethanol (1%) was checked regularly every week. After 1 week, the biosensor response decreased by only 1.5%. A dramatic decrease was observed however after seven weeks of storage. The biosensor response decreased by about 9.5% from the initial value, which means that the biosensor could be used up to seven weeks, since within these periods the colour change of the biosensor can be detected by the naked eye. However, after eight weeks, the biosensor response continues to decrease, maintaining 70%, of the initial response as shown in Figure 6. This is very promising achievement with respect to the stability of the biosensor response, since it is well known from previous studies that AOX has a poor long-term stability which was its main disadvantage in previous biosensors [42–44].
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