Inulae Flos and Its Compounds Inhibit TNF-α- and IFN-γ-Induced Chemokine Production in HaCaT Human Keratinocytes

Table 1

Linear regression, correlation coefficients (𝑟²), LOD, and LOQ for the reference compounds (𝑛=3).

Compound	Regression equation	Correlation coefficient (𝑟^2)	Linear range (μg/mL)	LOD (μg/mL)	LOQ (μg/mL)
Chlorogenic acid	𝑦 = 32900x – 11317	0.9997	1.56–50	0.03	0.09
Caffeic acid	𝑦 = 52440x – 4993.7	0.9999	0.63–20	0.02	0.06
1,5-Dicaffeoylquinic acid	𝑦 = 27029x – 115613	0.9996	12.50–200	0.13	0.43
Rutin	𝑦 = 18447x – 3067.7	0.9999	1.56–50	0.05	0.16
Kaempferol-3-O-glucoside	𝑦 = 21596x – 1615.6	0.9998	0.31–5	0.06	0.20
Quercetin	𝑦 = 28313x – 10729	0.9995	0.63–20	0.05	0.15
Luteolin	𝑦 = 39978x – 13399	0.9998	0.78–25	0.03	0.10
6-Methoxy-luteolin	𝑦 = 27712x – 10638	0.9996	0.78–25	0.04	0.13

LOD: limit of detection; LOQ: limit of quantification; 𝑦: peak area (mAU); x: concentration of compound (μg/mL).