Table 2.

FT-IR C—H wave numbers (cm⁻¹) changes compared with control and abdominal hydrated whole pig skin following treatment with different vehicles. (Each value represents the mean ± S.D. n = 3, * denotes statistical significance at a level of p < 0.05; ** denotes statistical significance at a level of p < 0.01 with PBS control group).

Group	CH2 sym stretching		CH2 asym stretching		CH2 scissoring
	wavenumber/cm−1	height	wavenumber/cm−1	height	width
PBS	2851.50 ± 0.41	0.09 ± 0.02	2919.19 ± 0.24	0.14 ± 0.02	56.57 ± 2.13
20 mg/ml DPH water solution	2851.96 ± 0.21	0.10 ± 0.02	2919.82 ± 0.58	014 ± 0.04	56.57 ± 2.13
30% ethanol −20 mg/ml DPH solution	2851.46 ± 0.27	0.05 ± 0.01*	2919.70 ± 0.48	0.09 ± 0.01*	55.28 ± 2.13
20 mg/ml DPH ethosomes	2852.56 ± 0.46*	0.05 ± 0.01*	2920.96 ± 0.77*	0.09 ± 0.02*	66.85 ± 2.13*