FTIR Analysis of Irvingia gabonensis Kernel Oil (IGKO)
The result in Fig. 17 was analyzed and compared with known signature of
identified materials in the FTIR library [71]. For the IGKO sample
(Fig. 17), the peak center at 900.7966 cm-1 is
characteristics of P – F stretching, indicating the presence of
phosphorus compounds. The peak at 1047.5 cm-1 is a
characteristic of C – O stretching, indicating the presence of alcohol
and phenol, which are oxygen-containing compounds. For the peak at
1369.536 cm-1, it is a characteristic of aromatic
nitro compound NO2 stretching, which is an indication of
the presence of nitrogen-containing compounds. The peaks centers at
1473.258 cm-1and 1664.323 cm-1, are
characteristics of C = C stretching and nitrite N – O stretching,
respectively, indicating the presence of aromatic compounds and
nitrogen-containing compounds, respectively. In a similar way, the peak
at 2020.284 cm-1 is characteristics of combination N
– H stretching, combination O – H stretching, indicating the presence
of organic compounds. The peaks at 2353.372 cm-1 and
2659.711 cm-1 are characteristics of phosphorus
acid/ester P – H stretching and phosphorus acid/ester O – H
stretching, respectively, which are indications of the presence of
phosphorus compounds. Also, the peaks centered at 3002.457
cm-1 and 3289.143 cm-1 are
characteristic of O – H stretching, indicating the presence of
carboxylic acids, which are oxygen-containing compounds and water.
Lastly, the peak at 3772.403 cm-1 is beyond the
infrared band of 3700 wavenumber (cm-1) for organic
compounds as such, could not be identified.