Analysis of the changing pattern of volatile aldehydes from an industrial scale malting process

Volatile aldehydes identified from malting process were investigated by solid phase microextraction (SPME) combined with GC-MS. A total of fifty volatile aldehydes were identified, and most of these aldehydes survived in the whole malting process. As a result, it had a big influence for the kilning and roasting process to the content of aldehydes, which made the content of aldehydes deceased during this process.The concentration of hexanal, nonanal, E-2-octenal increased at the beginning of malting, then decreased in the following stage. Meanwhile, the content of acetaldehyde, octanal, 2-methyl-propanal deceased steply.The concentration of 2-methly-butanal did not changed at the beginning of malting, then jumped to a high level at the end of malting. And the concentration of 3-methyl-butanal did not change during the whole process.