A Stability-Indicating HPLC-DAD Method for Determination of Ferulic Acid into Microparticles: Development, Validation, Forced Degradation, and Encapsulation Efficiency

Table 4

Repeatability and intermediate precision data for ferulic acid analysis.

Sample solution; (μg/mL)	Measured concentration ± SD; (μg/mL)	RSD (%)
Repeatability ()
15	16.82 ± 0.24	1.43
40	40.21 ± 0.31	0.77
65	64.67 ± 0.30	0.46
Intermediate precision ()
Day 2
40	39.44 ± 0.05	0.13
Day 3
40	40.32 ± 0.78	1.93

SD = standard deviation; RSD = relative standard deviation.