C (µg/mL)
One freeze-thawing cycle
Two freeze-thawing cycles
Post-extracted samples
±SD RSD%
0.1
0.089±0.0026
2.92
0.105±0.0102
9.68
0.113±0.004
3.53
0.5
0.477±0.055
11.54
0.53±0.06
11.34
0.501±0.007
1.38
1.6
1.67±0.06
3.58
1.62±0.052
3.23
1.654±0.067
4.05