Combustion of non-hydrocarbon organic compounds
Simultaneous elemental analysis of organic carbon, hydrogen, and nitrogen is classically accomplished by combusting the material under a stream of $\ce{O2}$, usually in the presence of a catalyst to ensure complete combustion, at a temperature of 950-1050$^o$C.  Carbon, hydrogen, and nitrogen are quantitatively converted to $\ce{CO2}$, $\ce{H2O}$ and $\ce{N2}$, respectively.  This is a common method in particular for determining nitrogen concentration in amino acids.