(a) Summary of functional groups in sweet corn

Temperature (°C)	O-H stretching	C-H asymmetric stretch	Asymmetrical stretching in O=C=O	Stretching vibration in C-O	Carbonyl group	O-H bending	C-O stretch	Hetero-oxy compounds
64-200°C	√		√		√	√
200-300°C	√	√	√	√	√	√	√	√
300-450°C	√	√	√	√	√	√	√	√
>450°C		√	√	√	√		√