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Table 1 CAP concentration in EtOH- vs. Tween-based solvent systems

From: Standardized method for solubility and storage of capsaicin-based solutions for cough induction

Concentrations (μM)  
Abs at 281 nm ± 1 std. dev. (3 replicates)  
95% EtOH 10% EtOH Tween Ratio (E/P)
50.0 ± 2.3 45.1 ± 3.3 43.1 ± 2.7 0.90 ± 0.08
150.0 ± 0.1 135.8 ± 4.6 137.7 ± 0.8 0.91 ± 0.03
250.0 ± 0.1 226.5 ± 8.8 232.3 ± 4.4 0.91 ± 0.05
350.0 ± 0.1 317.2 ± 3.5 326.9 ± 4.4 0.91 ± 0.01
450.0 ± 0.1 407.9 ± 20.1 421 ± 8.9 0.91 ± 0.05