Table 5. Determination of MTZ in pharmaceutical tablet samples (n = 3); Recovered concentrations obtained for MTZ using a SERS method with G-D-Ag and calibration curve at 1359 cm⁻¹ (n = 3).

Sample	Expected	Found	Recovery %	Confidence interval	Bias (%)
Tablet 1	5 mg/g	4.93 mg/g	98.6	0.31 × 10−6 M	−1.4
Tablet 2	5 mg/g	4.88 mg/g	97.6	0.31 × 10−6 M	−2.4
Spiked 1	2.5 × 10−6 M	2.61 × 10−6 M	104.4	0.48 × 10−6 M	+4.4
Spiked 2	5.0 × 10−6 M	5.13 × 10−6 M	102.6	0.72 × 10−6 M	+2.6