A fractional purge and cryogenic trap method for the isolation of volatiles from dried Jimbu (Allium wallichii) was studied. Thermal desorption and trapping of volatiles at −73°C gave the best results in terms of volatile recovery. A total of 96 compounds were identified from the three different cryogenic traps, including twenty-seven sulfur compounds. Among the sulfur volatiles, 1,2 bis (methylthio) ethene, 2,4 dimethyl thiophene, dimethyl disulfide and dimethyl trisulfide were found to be the major volatile components of dried Jimbu.

Thermal desorption and trapping at 73°C effectively isolates volatile compounds from dried Jimbu, with sulfur compounds being the major components.

Volatile compounds from dried Jimbu (Allium wallichii)

Key Takeaway: Thermal desorption and trapping at 73°C effectively isolates volatile compounds from dried Jimbu, with sulfur compounds being the major components.