Assignment

Wave number (cm⁻¹)

DPPC

DOPC

SPM

CHOL

OH/NH

3400 - 3100

3355

3393

3292

3425

C-H

3100 - 2800

2956:2917:2849

3005:2922:2853

2918:2850

2931:2901:2867:2849

C=O

1800 - 1700

1733

1737

Amide I

1700 - 1600

Amide II

1600 - 1500

Amide III

1350 - 1250

Phosphate

1260 - 1050

1243:1198:1062

1242:1172:1090:1051

1237:1089:1054

1055

${\text{NH}}_4^{+}$

1000 - 700

969:721

971:873:823:722

960:721

953:841:800:743