TABLE 2

Characteristics of HPLC calibration curves and the measured solubility of essential oil components in water, TSB, 2% (vol/vol) ethanol, and 5% (vol/vol) ethanol at 21°Ca

CompoundPeak area-concn calibration curveRecovery (%)Solubility inb:
Regression equationR2Concn range (mg/ml)Water (g/liter)TSB (g/liter)Ethanol (vol/vol)
2%5%
ThymolA = 14,558 C0.99980–196.56 ± 1.430.48 ± 0.02 b0.43 ± 0.01 b0.52 ± 0.02 ab0.61 ± 0.05 a
CarvacrolA = 13,789 C0.99990–199.64 ± 1.840.45 ± 0.02 b0.41 ± 0.00 b0.46 ± 0.00 b0.57 ± 0.02 a
EugenolA = 14,190 C0.99970–196.37 ± 2.741.35 ± 0.1 b1.42 ± 0.01 b1.49 ± 0.02 b1.63 ± 0.12 a
trans-CinnamaldehydeA = 134,163 C0.99920–0.196.70 ± 3.831.41 ± 0.05 bc1.51 ± 0.03 c1.63 ± 0.04 ab1.72 ± 0.13 a
  • a Numbers are mean ± standard error (n = 3).

  • b Different lowercase letters next to the numbers in the same row represent significant differences (P < 0.05).