Frequency (cm)1

Possible Assignment

3398.56 cm−1

OH stretching vibrations

2912.09 cm−1

The C-H stretch in alkanes

2845.74 cm−1

O-H stretch in carboxylic acid

1561.06 cm−1

C=C stretch in aromatic ring and C=O stretch in polyphenols

1461.45 cm−1

C-N stretch of amide-I in protein

1018.12 cm−1

C-O stretching in amino acid

533.71 cm−1

hexagonal phase ZnO