Physical and Chemical Properties of Biodiesel Obtained from Amazon Sailfin Catfish (Pterygoplichthys pardalis) Biomass Oil

Table 3

Differences between produced biodiesel and oil according to analyzed regions of the infrared spectrum.

Absorbance band (cm^−1)	Assignment	Biodiesel	Oil	Reference
1450–1455	Vibrations of asymmetric flexion of the functional group -CH3	Present	Absent	[51, 52]
1370–1400	O-CH2 functional group present in glycerol (TG, DG, and MG)	Absent	Present	[52]
1180–1200	Vibration of asymmetric stretching of O-C-C bonds	Present	Absent	[52, 53]
1050–1120	Vibrations of asymmetric stretching of O-CH2-C bonds	Absent	Absent	[52, 53]