Table 1.

Representative of predicted functional groups.

Peaks	Possible functional group	References
3412	Hydroxyl (–OH)	Gao et al. (2014)
3180	Hydroxyl (–OH)	Bhuiyan and Rahman (2014)
2906	Methyl (–CH3) primary group	Gordin et al. (2009)
2837	Methylene (–CH2) secondary group	Bhat et al. (2003)
1641	Amide I	Ahmad et al. (2014)
1400	C–H bonding	Ferrari et al. (2003)
1101	C–O–C bonding	Tajau et al. (2013)