2.8. Statistical analysis
AA currents were expressed in nanoamperes and given as
mean ± standard deviation (SD) of absolute oxidation currents
(nA) or baseline-subtracted currents (DnA). After in vitro calibrations,
the AA currents were plotted vs the AA concentration and
the linear regression was calculated. AA-spiked data were obtained
by subtracting the baseline after each injection of juice and expressed
as DnA. AA juice content was expressed as the molarity
and then converted to mg/100 g to be comparable with reference
method. In order to assure the similarity between the data obtained
with the sensor and those obtained with the titrimetric
method, a Student’s t-test to compare means was performed.
As mentioned above, the AA-related amperometric signal was
reduced by melon juice addiction. The mathematical model that
best represented this phenomenon was the ‘‘one-phase exponential
decay’’ described by the following equation: