Table 3.

Robustness test of ƒ_s/i.

Influencing factors		RCFs
		f C3/C1	f C3/C2	f C3/C4	f C3/C5
UPLC	Column: Waters	0.397	0.479	0.817	0.902
	Column: Thermo	0.398	0.479	0.824	0.901
	Flow rate: 0.2 ml/min	0.397	0.481	0.812	0.897
	Flow rate: 0.3 ml/min	0.391	0.479	0.803	0.889
	Column temperature: 25°C	0.393	0.487	0.808	0.925
	Column temperature: 30°C	0.396	0.481	0.809	0.895
	Column temperature: 35°C	0.399	0.482	0.818	0.901
HPLC	Column: Phenomenex	0.376	0.471	0.785	0.879
	Column: Agilent	0.377	0.471	0.775	0.893
RSD (%)		2.28	1.06	2.07	1.48