Turn-On Fluorescence Detection of Glutathione Based on o-Phthaldialdehyde-Assisted SiO₂ Particles

Table 3

Analytical results for the determination of GSH in dietary supplement P1 using the proposed fluorescent method.

Found in sample P1 (μM)	Standard added GSH (μM)	Total found^a (μM)	Recovery (%, )	RSD^b (%, )	Accuracy^c (%)
1.2	1.0	1.88 ± 0.09	85.5	4.78	−14.5
	3.0	3.89 ± 0.15	92.6	3.76	−7.4
	5.0	5.91 ± 0.06	95.3	1.01	−4.7
	8.0	8.92 ± 0.15	96.9	1.68	−3.1
	10.0	10.9 ± 0.06	97.3	0.55	−2.7

^aMean ± standard deviation (). ^bRSD (%) was calculated from standard deviation/mean × 100, ^cAccuracy was calculated from [(found concentration – known concentration)/known concentration] × 100.