Stability procedures were employed to evaluate the stability of
the analytes during sample collection and handling after longterm
and short-term storage. The spiked samples containing TCs
and QNs were prepared and stored in a clear plastic container at
ambient temperature, 4 °C and 20 °C and then analyzed by the
present method. TCs and QNs in the milk samples were found to
be stable for one week, when stored at 4 °C or 2 weeks at 20 °C.
Extracted samples were found to be stable for at least 3 days at
4 °C and for 1 week, when stored at 20 °C, according to the
degradation criterion of 15% [26]. The studied antibiotics in the
meat samples were found to be stable for 4 days when stored at
4 °C, or one week when stored at 20 °C.