A Direct and Sensitive Method for Determination of 5-Fluorouracil in Colorectal Cancer Cells: Evaluating the Effect of Stromal Cell on Drug Resistance of Cancer Cells

Table 5

The stability of analytes in different conditions (n = 5).

Analyte	Nominal analyte concentration (ng/mL)	Freeze-thaw stability		Short-term stability		Long-term stability
		Measured concentration (ng/mL)	RE%	Measured concentration (ng/mL)	RE%	Measured concentration (ng/mL)	RE%
5-FU	50	41.32	82	47.50	95	44.17	88
	4000	3872.49	96	3942.21	98	3325.85	83