Table 8 Stock and working solutions stability.

From: Protoporphyrin IX plasma and blood pharmacokinetics and brain tumor distribution determined by a validated LC–MS/MS method

Stability

Analyte

Internal standard

Stock solution

Working solutions

Stock solution

IS-PS

Room temperature

4 °C

Room temperature

− 80 °C

4 °C

Room temperature

4 °C

Period

23 h

241 days

17 h

113 days

432 days

5 h

42 days

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