Method development for simultaneous detection of ferulic acid and vanillin using high-performance thin layer chromatography

Journal of Analytical Science and Technology

Table 1 Intra- and inter-day precision ( n = 5)

Compound	Std amount (ng/band)	Intra-day precision		Inter-day precision
Compound	Std amount (ng/band)	SD^a	%RSD^b	SD^a	%RSD^b
Ferulic acid	100	4.52	0.021	1.64	0.053
	150	2.93	0.015	4.66	0.091
	200	4.51	0.001	4.57	0.050
Vanillin	100	2.09	0.044	2.21	0.040
	150	2.97	0.048	2.77	0.042
	200	1.93	0.022	2.02	0.023

SD, standard deviation (n = 5); RSD, percent relative standard deviation (n = 5).