The bond energy of O–H in CH3OH was 464 kJ/mol, and the
bond energy of O-COCH3 in H3COCOCH3 was 406 kJ/mol.
Benzoylaconines were more stable relative to aconitines
(ACO, HYP and MES). The difference of their molecule
structure was that H was the R3 group in the structure of
Benzoylaconines while it was acetyl in the structure of
Aconitines as shown in Fig. 2, indicating that Aconitines
were more easily degraded. Another evidence of the stability
of Benzoylaconines was that Aconitines could be hydrolyzed
to form Benzoylaconines at high temperature (160–170°C)
(Singhuber et al., 2009). These were the probable reasons why
the degradation efficiency of Aconitines was higher than the
degradation efficiency of Benzoylaconines.