Differential diagnosis of gallstones by using hypericin as a fluorescent optical imaging agent

Table 5 Linearity of the high performance liquid chromatography methods for cholesterol and hypericin

Compound	LR	Slope	SD (LR)	R2	LOD (M)	LOQ (M)
Cholesterol	y = 1 × 107 x + 3 × 106	11712479	2055881	0.998	0.58 × 10-3	1.76 × 10-3
Hypericin	y = 2 × 106x + 2 × 105	2066297	433480	0.998	0.69 × 10-6	2.1 × 10-6

LR: Linear regression; SD (LR): Standard deviation of regression line; R²: Coefficient of correlation; y: Peak area; x: Compound concentration; LOD: Limit of detection; LOQ: Limit of quantification.