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. 2024 Sep 19;9(39):41032–41042. doi: 10.1021/acsomega.4c06604

Table 4. Stock Solution Stability of HHC and IS at −30 ± 10 °C for 22 days (Mean ± SD, n = 3).

analyte (nominal conc., ng/mL) observed conc. (ng/mL) accuracy (%) precision (CV%)
fresh
HHC (375.00) 375.00 ± 18.19 100 4.85
IS (110.10) 110.10 ± 1.38 100 1.25
stock stability for 22 days
HHC (375.00) 398.08 ± 1.45 106.15 0.36
IS (110.10) 112.08 ± 0.90 101.80 0.80