SPE-UHPLC-FLD Method for the Simultaneous Determination of Five Anthraquinones in Human Urine Using Mixed-Mode Bis(tetraoxacalix[2]arene[2]triazine) Modified Silica as Sorbent

Table 4

Comparison of BTO-SPE-FLD method with other methods for the determination of anthraquinones.

Clean-up	Determination technique	Linearity; (μg mL^−1)	Recoveries (%)	RSD; (%)	LOD; (μg mL^−1)	References
HLB-SPE	MEKC	5–50	98–107	<2.55	0.50–0.58	[11]
C18-SPE	HPLC-FLD	0.0210–19.52	94.2–110.4	<7.4	0.007–0.0133	[13]
MIP-MSPD	HPLC-UV	1–200	91.2–101.4	5.3–7.1	0.23–0.28	[17]
Soxhlet extraction	CD-MEKC	3.86–85	91.1–100.08	1.12–2.01	0.75–1.15	[19]
BTO-SPE	UHPLC-FLD	0.012–1.8	94.9–105.6	2.03–2.86	0.0039–0.0057	This method

electrokinetic chromatography; imprinted polymer-matrix solid-phase dispersion; -modified micellar electrokinetic chromatography.