Qualitative and Quantitative Analysis of Volatile Components of Zhengtian Pills Using Gas Chromatography Mass Spectrometry and Ultra-High Performance Liquid Chromatography

Table 1

Regression equations, correlation coefficients, linearity ranges, LODs, LOQs, and recoveries of investigated compounds.

Analytes	Regression equation		Linearity range/μg mL^−1	LOD/μg	LOQ/μg	Recovery %	RSD %
Protocatechuic acid		0.9994	4.1–28.6	0.0019	0.0037	100.68	0.35
Ferulic acid		0.9992	80.2–561.4	0.025	0.074	100.98	0.56
Ligustilide		0.9994	110–770	0.044	0.084	102.69	0.28